Section
1 General requirements
1.1 Scope
1.1.1 This Section
gives the general requirements for hot rolled plates and sections
intended for use in the construction of ships, other marine structures,
machinery, boilers and pressure vessels.
1.1.2 This Chapter
is not applicable to hot rolled bars intended for the manufacture
of bolts, plain shafts, etc. by machining operations only. Where used
for this purpose, hot rolled bars are to comply with the requirements
of Ch 5 Steel Forgings.
1.1.3 Plate and
strip which is hot coiled after rolling and subsequently uncoiled,
cold flattened and cut to the required dimensions are also subject
to the appropriate requirements of this Chapter.
1.1.5 As an alternative
to Ch 3, 1.1 Scope 1.1.4, materials which comply
with National or proprietary specifications may be accepted, provided
that these specifications give equivalence to the requirements of
this Chapter or are approved for a specific application. Particular
attention is to be taken of the minimum required under thickness tolerance, see
Ch 3, 1.7 Dimensional tolerances. Generally, survey
and certification of such materials are to be carried out in accordance
with the requirements of Ch 1 General Requirements.
1.1.6 Steels intended
for high heat input welding above 50 kJ/cm are to be specially approved.
Approval will be indicated on the manufacturer’s approval certificate
by adding a high heat input welding notation to the grade approved
e.g. EH36-W300, indicating approval up to 300 kJ/cm.
1.2 Steel with guaranteed through thickness properties – 'Z'
grade steel
1.2.1 When plate
material, intended for welded construction, will be subject to significant
strains in a direction perpendicular to the rolled surfaces, it is
recommended that consideration be given to the use of special plate
material with specified through thickness properties, 'Z' grade steel.
These strains are usually associated with thermal contraction and
restraint during welding, particularly for full penetration 'T'-butt
welds, but may also be associated with loads applied in service or
during construction. Where these strains are of sufficient magnitude,
lamellar tearing may occur. Requirements for 'Z' grade plate material
are detailed in Ch 3, 8 Plates with specified through thickness properties. It is the
responsibility of the fabricator to make provision for the use of
this material.
1.2.2 Steels intended
to have guaranteed through thickness properties will include the supplementary
suffix Z25 or Z35 in the designation, for example: LR DH36 Z35.
1.3 Corrosion resistant steels for cargo oil tanks of crude oil tankers
1.3.1 This sub-Section
refers to normal and higher strength steels that have approved enhanced
corrosion resistance properties intended for application in the internal
cargo oil tanks of crude oil tankers.
1.3.4 Corrosion
resistant steels for cargo oil tanks are primarily intended to apply
to steel plates, wide flats and sections up to 50 mm thick and to
bars up to 50 mm in diameter.
1.3.5 Corrosion
resistant steels for cargo oil tanks are to be identified with one
of the following supplementary suffixes, RCU, RCB or RCW in the designation,
for example, LR DH36 RCB. These suffixes relate to the area of the
tank for which approval testing has been obtained:
-
RCU, for the lower surface of strength deck and surrounding
structures, defined as the deckhead with complete internal structure,
including brackets connecting to longitudinal and transverse bulkheads.
In addition:
-
In tanks with ring frame girder construction
the underdeck transverse framing is to be protected down to level
of the first tripping bracket below the upper faceplate;
-
Longitudinal and transverse bulkheads are to
be protected to the uppermost means of access level. The uppermost
means of access and its supporting brackets are to be fully protected.
-
On cargo tank bulkheads without an uppermost
means of access the protection is to extend to 10 per cent of the
tank’s height at centreline but need not extend more than 3
m down from the deck.
-
RCB, for the upper surface of inner bottom plating and surrounding
structures, defined as the flat inner bottom and all structure to
a height of 0,3 m above inner bottom, is to be protected;
-
RCW, for both strength deck and inner bottom plating.
1.3.7 The weldability of corrosion resistant steels is similar to conventional
normal and higher strength steels. Therefore the welding requirements specified in Ch 11 Approval of Welding Consumables to Ch 13 Requirements for Welded Construction
are to be adhered with the exception that each corrosion resistant steel is approved
with a specified brand of welding consumable and associated welding process.
1.3.8 Each manufacturer’s
approval certificate for corrosion resistant steels will state the
steel grade and area of application designation, specified chemical
composition range including additive and/or controlling element percentages
to improve corrosion resistance, and brand of welding consumables
and welding process used for approval.
1.4 Manufacture
1.4.1 All materials
are to be manufactured at works which have been approved by Clasifications
Register for the type and grade of steel which is being supplied and
for the relevant steel-making and processing route.
1.4.2 Steel is
to be cast in metal ingot moulds or by the continuous casting process.
The size of the ingot, billet or slab is to be proportional to the
dimensions of the final product such that the reduction ratio is normally
to be at least 3 to 1. Sufficient discard is to be taken to ensure
soundness in the portion used for further processing.
1.4.3 The cast
analysis to be used for certification purposes is to be determined
after all alloying additions have been carried out and sufficient
time allowed for such an addition to homogenise.
1.4.4 Material
may be supplied either as-rolled, normalised, normalising rolled,
or thermomechanically controlled rolled. The following definitions
apply:
-
As-rolled (AR) refers to steel being cooled as it is rolled with no
further heat treatment. The rolling and finishing temperatures are typically in
the austenite recrystallisation region and above the normalising temperature. The
strength and toughness properties of steel produced by this process are generally
less than those of steel heat treated after rolling or steel produced by advanced
processes.
-
Normalising (N) refers to an additional heating cycle of rolled steel
above the critical temperature, Ac3, and in the lower end of the austenite
recrystallisation region for a specific period of time, followed by air cooling.
The process improves the mechanical properties of as-rolled steel by refining the
grain size and homogenising the microstructure.
-
Normalising rolling (NR), also known as controlled rolling, is a
rolling procedure in which the final deformation is carried out in the normalising
temperature range, and subsequently cooled in air, resulting in a material
condition generally equivalent to that obtained by normalising.
-
Thermomechanically
controlled rolling (TM) is a procedure which involves the strict control
of both the steel temperature and the rolling reduction. Generally
a high proportion of the rolling reduction is carried out close to
the Ar3 temperature and may involve the rolling in the
dual phase temperature region. Unlike normalising rolling the properties
conferred by TM (TMCP) cannot be reproduced by subsequent normalising
or other heat treatment. The use of accelerated cooling on completion
of TM may also be accepted subject to the special approval by LR.
-
Accelerated Cooling,
(AcC) is a process which aims to improve mechanical properties by
controlled cooling with rates higher than air cooling immediately
after the final TM operation. Direct quenching is excluded from accelerated
cooling. The material properties conferred by TM and AcC cannot be
reproduced by subsequent normalising or other austenitising heat treatment.
-
Quenching and Tempering (QT) is a heat treatment process in which
steel is heated to an appropriate temperature above the Ac3, held for a
specific period of time, and then cooled with an appropriate coolant for the
purpose of hardening the microstructure, followed by tempering, a process in which
the steel is re-heated to an appropriate temperature, not higher than the
Ac1, maintained at that temperature for a specific period of time to
restore the toughness properties by improving the microstructure and reducing the
residual stresses resulting from the quenching process.
1.4.5 Where material
is being produced by a normalising rolling or a thermomechanically
controlled process (T.M.) an additional program of tests for approval
is to be carried out under the supervision of the Surveyors and the
results are to be to the satisfaction of LR.
1.5 Surface quality of materials
1.5.1 The steel is to be free from surface defects prejudicial to the use of the
material for the intended application. The finished material is to have a surface
quality in accordance with a recognised standard such as EN 10163-1, EN 10163-2 and EN
10163-3 or an equivalent standard accepted by LR, unless otherwise specified in this
Section.
1.5.2 The responsibility for meeting the surface finish requirements rests with the
manufacturer of the material, who is to take the necessary manufacturing precautions and
is to inspect the products prior to delivery. If, during the subsequent processing
operations, surface quality of the material is found to be defective, the materials
shall be repaired or rejected.
1.5.3 For hot rolled plates, wide flats and sections, the surface quality inspection method
shall be in accordance with recognised National or International Standards as agreed
between the purchaser and the manufacturer, and accepted by LR. The surface inspection
acceptance criteria are to comply with the following:
- Imperfections
Imperfections of a harmless
nature, for example pitting, rolled-in scale, indentations, roll marks,
scratches and grooves, regarded as being inherent in the manufacturing process,
are permissible, provided the maximum permissible limits of Class A of EN
10163-2 or limits specified in a recognised equivalent standard accepted by LR,
are not exceeded and the remaining plate or wide flat thickness remains within
the average allowable minus thickness tolerance specified in Ch 3, 1.7 Dimensional tolerances. The surface area
exhibiting the imperfections is not to exceed 15 per cent of the total subject
area.
- Defects
Affected areas with imperfections with a depth
exceeding the limits of Class A of EN 10163-2 or the maximum permissible limits
specified in a recognised equivalent standard accepted by LR, shall be
repaired. Cracks, injurious surface flaws, shells (overlapping material with
non-metallic inclusion), sand patches, laminations and sharp edged seams
(elongated defects) visually evident on surface and/or edge of plate are
considered defects which would impair the end use of the product and which
require rejection or repair.
1.5.5 The examination and acceptance standard of surface quality and condition requirement of
sections, bars and tubulars is to be agreed between the purchaser and the steel maker,
and accepted by LR. It then has to be included in the manufacturing specification.
1.6 Internal soundness
1.6.1 The steel is to be free from segregations and non-metallic inclusions prejudicial to
the use of the material for the intended application.
1.6.2 Verification of internal soundness is the responsibility of the
manufacturer. The acceptance of internal soundness by the LR Surveyor shall not
absolve the manufacturer from this responsibility.
1.7 Dimensional tolerances
1.7.1 The tolerances on thickness of a given product are defined as:
-
Minus tolerance is the lower limit of the acceptable range below the
nominal thickness.
-
Plus tolerance is the upper limit of the acceptable range above the
nominal thickness.
Nominal thickness is defined by the purchaser at the time of enquiry and
order.
1.7.3 For materials of nominal thickness 5 mm and more intended for hull structural
purposes as detailed in Ch 3, 2 Normal strength steels for ship and other structural applications, Ch 3, 3 Higher strength steels for ship and other structural applications and Ch 3, 10 High strength steels for welded structures, the minus tolerance on thickness of plates, strip and wide flats,
where the width is greater than or equal to 600 mm, is 0,3 mm, irrespective of nominal
thickness. The average thickness of a product or products is not to be less than the
nominal thickness. Plus tolerance is to be in accordance with a National or
International Standard unless agreed otherwise by LR and the purchaser.
1.7.4 Class C of ISO 7452 or equivalent National or International Standards may
be applied in lieu of Ch 3, 1.7 Dimensional tolerances 1.7.3. Where this standard is applied, the steel mill is
to ensure that the number of measurements and measurement distribution is appropriate to
establish that the plates produced are greater than or equal to the specified nominal
thickness.
1.7.6 The minus tolerance on bars and sections (except for wide flats with a
width ≥ 600 mm) is to be in accordance with the requirements of a recognised National or
International Standard.
1.7.7 The Shipbuilder and Owner may agree in individual cases whether they wish
to specify a more stringent minus tolerance than that given in this Chapter.
1.7.8 The dimensional tolerances for the products intended for the construction of lifting
appliances are to be agreed with LR.
1.7.11 For the materials detailed in Ch 3, 7 Austenitic and duplex stainless steels, the minus tolerance of material intended for use in the
construction of cargo tanks is not to exceed 0,3 mm. For other applications, no minus
tolerance is permitted in the thickness of plates and strip.
1.7.13 The average thickness and thickness tolerance is to be measured at
locations of a product or products as defined below:
-
An automated method or manual method may be applied to the thickness
measurements. The procedure and the records of measurements are to be made
available to the Surveyor and copies provided on request.
-
At least two lines among Line 1, Line 2 or Line 3, as shown in Figure 3.1.1 Location of thickness measuring
points, are to be selected for the thickness
measurements and at least three points on each selected line as shown in Figure 3.1.1 Location of thickness measuring
points are to be selected for thickness
measurement on each piece rolled from a single slab or single ingot. If more than
three points are taken on each line, then the number of points shall be equal on
each line.
-
For automated methods, the measuring points at sides are to be
located not less than 10 mm but not greater than 300 mm from the transverse or
longitudinal edges of the product.
-
For manual methods, the measuring points at sides are to be located
not less than 10 mm but not greater than 100 mm from the transverse or
longitudinal edges of the product.
-
Additional measurements may be requested by the Surveyor.
Figure 3.1.1 Location of thickness measuring
points
1.7.14 Local surface depressions resulting from imperfections and ground areas
resulting from the elimination of defects may be disregarded provided that they are in
accordance with the requirements of a recognised National or International Standard.
1.7.15 Tolerances relating to length, width, flatness and plus thickness are to
comply with a National or International Standard.
1.7.16 The responsibility for maintaining the required tolerances and making the
necessary measurements rests with the manufacturer. Occasional checking by the Surveyor
does not absolve the manufacturer from this responsibility.
1.7.17 The Shipbuilder is responsible for the storage and maintenance of
product(s) delivered with acceptable surface conditions.
1.8 Heat treatment
1.8.1 Acceptable
conditions of supply are specified in subsequent Sections of this
Chapter.
1.8.2 The manufacturer
is to carry out any heat treatment which may be necessary to prevent
hydrogen cracking or to make the material in a safe condition for
transit. The Surveyor is to be advised of any heat treatment proposed.
1.8.3 Where material
is manufactured using a thermomechanically controlled process consideration
must be given to the possibility of consequent reduction in mechanical
properties if it is subjected to heating for forming or stress relieving
or is welded using a high heat input.
1.9 Test material and mechanical tests
1.9.1 Depending
on the type of product, provision is made in subsequent Sections of
this Chapter for the testing of individual items or for batch testing.
Where the latter is permitted, all materials in a batch presented
for acceptance tests are to be of the same product form, (e.g. plates,
flats, sections, etc.), from the same cast and in the same condition
of supply.
1.9.2 The test
samples are to be fully representative of the material and, where
appropriate, are not to be cut from the material until heat treatment
has been completed. The test specimens are not to be separately heat
treated in any way.
1.9.3 The test
material is to be taken from the thickest piece in each batch, see
Ch 1, 4.1 General.
1.9.4 Test material
is to be taken from the following positions:
-
At the square cut end
of plates and flats greater than 600 mm wide, approximately one-quarter
width from an edge, see
Figure 3.1.2 Position of test material.
-
For flats 600 mm or
less in width, bulb flats and other solid sections, at approximately
one-third of the width from an edge, see
Figure 3.1.2 Position of test material, Figure 3.1.2 Position of test material and Figure 3.1.2 Position of test material. Alternatively,
in the case of channels, beams or bulb angles, at approximately one-quarter
of the width from the centreline of the web, see
Figure 3.1.2 Position of test material.
-
For rectangular hollow
sections, at approximately the centre of any side, see
Figure 3.1.2 Position of test material. For circular hollow sections,
at any position on the periphery.
-
For bars intended for
purposes as detailed in Ch 3, 2 Normal strength steels for ship and other structural applications, Ch 3, 3 Higher strength steels for ship and other structural applications, Ch 3, 5 Steels for machinery fabrications and Ch 3, 9 Bars for welded chain cables, at approximately one-third of the radius
or half-diagonal from the outer surface, see
Figure 3.1.2 Position of test material. For smaller bars, the
position of the test material is to be as close as is possible to
the above.
-
For bars intended for
the applications detailed in Ch 3, 4 Steels for boilers and pressure vessels, Ch 3, 6 Carbon–manganese and nickel alloy steels for low temperature service and Ch 3, 7 Austenitic and duplex stainless steels at
approximately 12,5 mm below the surface. For bars up to 25 mm diameter,
the test specimens may be machined coaxially.
-
When the capacity of the available testing machine is insufficient,
tensile testing is to be carried out in accordance with the requirement of Ch 2, 2.1 Dimensions of test specimens 2.1.6.
1.9.5 Tensile test
specimens and impact test specimens, where required for the type and
grade of product being supplied, are to be prepared from each item
or batch of material submitted for acceptance.
1.9.6 Where the
finished width of plates and flats is greater than 600 mm, the tensile
test specimens are to be cut with their principal axes perpendicular
to the final direction of rolling. For all other rolled products,
the principal axes are to be parallel to the final direction of rolling.
1.9.8 Impact test
specimens are to be cut with their principal axes either parallel
(longitudinal test) or perpendicular (transverse test) to the final
direction of rolling, as required by subsequent Sections of this Chapter.
Where both longitudinal and transverse impact properties are shown
for a particular grade, only the longitudinal test is required to
be carried out, unless otherwise specified by the purchase order or
subsequent Sections of this Chapter. However, for plates and wide
flats, by certifying that the product meets the requirements of the
Rules, the manufacturer guarantees that the acceptance values will
be met if tested in the transverse direction. The Surveyor may request
testing in this direction to confirm conformity.
1.9.9 Impact test
specimens are to be of the Charpy V-notch type, machined to the dimensions
detailed in Ch 2 Testing Procedures for Metallic Materials. They are to be
taken from a position within 2 mm of one of the rolled surfaces, except
that for plates and sections over 40 mm thick, the axes of the test
specimens are to be at one-quarter of the thickness from one of the
rolled surfaces. For bars and other similar products the axes of the
test specimens are to be as specified in Ch 3, 1.9 Test material and mechanical tests 1.9.4.(d).
1.9.10 Standard
test specimens 10 mm square are to be used, except where the thickness
of the material does not allow this size of test specimen to be prepared.
In such cases the largest possible size of subsidiary test specimen,
in accordance with Table 2.3.1 Dimensions and tolerances for
Charpy V-notch impact test specimens is
to be prepared, with the notch cut on the narrow face. Alternatively,
for material of suitable thickness, the rolled surfaces may be retained
so that the test specimen width will be the full thickness of the
material. In such cases the tolerances for width given in Table 2.3.1 Dimensions and tolerances for
Charpy V-notch impact test specimens in Chapter 2 are not applicable.
The notch is to be cut in a face of the test specimen which was originally
perpendicular to the rolled surface. The position of the notch is
to be not nearer than 25 mm to a flame-cut or sheared edge.
1.9.11 Impact
tests are not required when the nominal material thickness is less
than 6 mm.
1.10 Visual and non-destructive examination
1.10.1 Surface inspection and verification of dimensions are the responsibility of
the steelmaker and are to be carried out on all material prior to despatch. Acceptance
by the Surveyors of material later found to be defective shall not absolve the
steelmaker from this responsibility.
1.10.2 With the exception of 'Z' grade plate material (see
Ch 3, 8 Plates with specified through thickness properties) and bars for offshore mooring cable (see
Ch 3, 9 Bars for welded chain cables), the non-destructive examination of materials is not
required for acceptance purposes. However, manufacturers are expected to employ suitable
methods of non-destructive examination for the general maintenance of quality standards.
If agreed by the manufacturer and purchaser that the plates and wide flats products are
ordered with an ultrasonic examination requirement, then the examination is to be
carried out in accordance with a recognised standard accepted by LR, which is then to be
included in the manufacturing specification.
Figure 3.1.2 Position of test material
1.10.3 Advanced NDE methods, as described in Ch 1, 5.11 Advanced NDE methods, may be applied to rolled steel
components, as appropriate to the material type, thickness, complexity and geometry, in
lieu of or complementary to existing NDE methods, as applicable.
1.10.4 Verification of results of visual and non-destructive examination is the
responsibility of the manufacturer. The acceptance of internal soundness by the LR
Surveyor shall not absolve the manufacturer from this responsibility.
1.11 Rectification of defects
1.11.1 For materials
intended for structural purposes as detailed in Ch 3, 2 Normal strength steels for ship and other structural applications, Ch 3, 3 Higher strength steels for ship and other structural applications and Ch 3, 5 Steels for machinery fabrications,
surface defects may be removed by local grinding provided that:
-
the thickness is in no place reduced to less than 93 per cent of the
nominal thickness, but in no case by more than 3 mm,
-
each single ground area does not exceed 0,25 m2,
-
the total area of local grinding does not exceed two per cent of the
total surface,
-
adjacent ground areas, lying within a distance of less than their average breadth
to each other, are to be regarded as one single area,
-
ground areas lying opposite each other on both surfaces shall not
decrease the product thickness by values exceeding the limits as stated under
Ch 3, 1.11 Rectification of defects 1.11.1.(a),
-
the ground areas have smooth transitions to the surrounding
surface.
Where necessary, the entire surface may be ground to a maximum
depth as given by the underthickness tolerances of the product. The
extent of such rectification is to be agreed in each case with the
Surveyors and is to be carried out under their supervision, unless
otherwise agreed. They may request that complete removal of the defect
is proven by suitable non-destructive examination of the affected
area.
1.11.2 Surface
defects which cannot be dealt with as in Ch 3, 1.11 Rectification of defects 1.11.1 may be repaired by chipping or grinding followed by welding,
subject to the Surveyor's consent and under his supervision, provided
that:
-
after removal of the
defect and before welding, the thickness of the item is in no place
reduced by more than 20 per cent,
-
each single weld does
not exceed 0,125 m2,
-
the total area of
welding does not exceed two per cent of the surface of the side involved,
-
the distance between
any two welds is not less than their average width,
-
the welds are of reasonable
size and made with an excess layer of beads which is then ground smooth
to the surface level,
-
elimination of the
defect is proven by suitable non-destructive examination of the affected
area,
-
welding is carried out by an approved procedure and by competent
operators using approved low hydrogen type electrodes and the repaired area is
ground smooth to the correct nominal thickness,
-
when requested by
the Surveyor, the item is normalised or otherwise suitably heat treated
after welding and grinding, and
-
at the discretion
of the Surveyor, the repaired area is proven free from defects by
suitable non-destructive examination.
1.11.3 For materials
intended for applications as detailed in Ch 3, 4 Steels for boilers and pressure vessels, Ch 3, 6 Carbon–manganese and nickel alloy steels for low temperature service and Ch 3, 7 Austenitic and duplex stainless steels,
surface defects may be removed by grinding in accordance with Ch 3, 1.11 Rectification of defects 1.11.1, except that when the thickness
is reduced below that given in the approved plans, acceptance will
be subject to special consideration. Weld repairs may also be carried
out generally in accordance with Ch 3, 1.11 Rectification of defects 1.11.2,
except that in all cases suitable heat treatment after welding and
non-destructive testing of the repaired areas is required. The fabricator
is to be advised regarding the position and extent of all repairs.
1.11.4 For plates
which have been produced by a T.M. process or by normalising rolling,
repair by welding will be approved by the Surveyor only after procedure
tests have shown that the mechanical properties have not been impaired.
1.11.5 Cracks,
shells, sand patches and sharp edged seams are always considered defects
which would impair the end use of the product and which require rejection
or repair irrespective of their size and number. The same applies
to other imperfections exceeding the acceptable limits.
1.12 Identification of materials
1.12.1 Every finished item is to be clearly marked by the manufacturer in at least
one place with LR's brand (see
Figure 3.1.3 LR Brand) and the following particulars:
-
The manufacturer's
name or trade mark.
-
The grade of steel.
The designations given in subsequent Sections of this Chapter may
be preceded by the letters 'LR' in order to fully describe the grade,
e.g. LR A, LR 490FG. LR LT-FH40, LR 316L , etc.
-
When the material
complies with the requirements of Ch 3, 8 Plates with specified through thickness properties, the grade is to include the suffix Z25 or Z35, e.g. LR AH36
Z35.
-
Identification number
and/or initials which will enable the full history of the item to
be traced.
-
If required by the
purchaser, his order number or other identification mark.
- Steels which have been specially approved and which differ from the requirements in
this chapter are to have the letter `S' after the agreed identification mark.
The above particulars, but excluding the manufacturer's name
or trade mark where this is embossed on finished products, are to
be encircled with paint or otherwise marked so as to be easily recognisable.
1.12.2 Where a number of light similar or identical products, such as sections and
bars, weighting ≤ 50 kg per meter, are securely fastened together in bundles, the
manufacturer may brand only each bundle. A firmly fastened durable label containing the
identification may be attached to each bundle.
1.12.3 In the
event of any material bearing LR's brand failing to comply with the
test requirements, the brand is to be unmistakably defaced, see
also
Ch 1, 4.8 Identification of materials.
Figure 3.1.3 LR Brand
1.13 Certification of materials
1.13.1 Unless
a LR certificate is specified in other parts of the Rules, a manufacturer’s
certificate validated by LR is to be issued (see
Ch 1, 3.1 General) and is to include the following
particulars:
-
Purchaser's name and
order number.
-
If known, the contract
number for which the material is intended.
-
Address to which material
is dispatched.
-
Name of steelworks.
-
Description and dimensions
of the material.
-
Specification or grade
of the steel.
-
Identification number
of piece, including test specimen number where appropriate.
-
Cast number and chemical
composition of ladle samples.
-
Mechanical test results
(not required on shipping statements).
-
Condition of supply.
1.13.2 Before
the test certificates are signed by the Surveyor, the steelmaker is
required to provide a written declaration stating that the material
has been made by an approved process, and that it has been subjected
to and has withstood satisfactorily the required tests in the presence
of the Surveyor, or an authorised deputy. The following form of declaration
will be accepted if stamped or printed on each test certificate with
the name of the steelworks and signed by an authorised representative
of the manufacturer:
`We hereby certify that the material has been made by an approved
process and satisfactorily tested in accordance with the Rules of
Clasifications Register'.
1.13.3 When steel
is not produced at the works at which it is rolled, a certificate
is to be supplied by the steelmaker stating the process of manufacture,
the cast number and the chemical composition of ladle samples. The
works at which the steel was produced must be approved by LR.
1.13.4 The manufacturer
of coiled plate is required to issue a certificate which clearly identifies
the material as coil. The certificate issued should include the words;
‘Coils covered by this certificate require further processing
at a works approved by Clasifications Register before being certified as
plate in accordance with the Rules of Clasifications Register’ in addition
to the requirements of Ch 3, 1.13 Certification of materials 1.13.2.
1.13.5 The supplier
of plate cut from coil is required to issue a certificate validated
by the LR Surveyor which clearly identifies the product as finished
plate meeting the requirements of the Rules in accordance with Ch 3, 1.13 Certification of materials 1.13.2.
1.13.6 The form
of certificates produced by computer systems is to be agreed with
the Surveyor.
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