Section 1 General

101. Application

1. The requirements in this Chapter apply to the materials intended to be used for the components specified in each Part of hull construction, equipment and machinery.

2. The materials other than those prescribed in this Chapter may be used where specially approved in connection with the design. In such cases, the detailed data relating to the chemical compositions and mechanical properties, etc. of the materials are to be submitted for approval.

3. Reinforced plastic materials used for construction or repair of plastic pipes, FRP ships or composite vessel should be in accordance with the Guidance relating to the Rules specified by the Society.

See Guidance

102. Approval of manufacturing process and manufacturing control

1. Approval of manufacturing process

(1) The materials prescribed in this Chapter, unless otherwise specially provided, are to be manufac- tured by open-hearth, electric furnace, basic oxygen processes, or other processes at works ap- proved by the Society. In this case, the manufacturer is to obtain the approval in accordance with the Guidance specially specified by the Society in advance concerning the process of man- ufacture (melting process, ingot casting, rolling, casting, forging and heat treating).

(2) The manufacturing process of semi-finished products such as ingots, slabs, blooms and billets for the normal and higher strength hull structural steels or forgings are to be approved in ac-

cordance with the Guidance specially specified by the Society in advance

(3) The rolled steel manufacturer supplied semi-finished products from other steel works or hot coil processor is required to obtain the approval of the manufacturing process according to the re- quirement of proceeding (1) as appropriate.

(4) The requirements specified in Pars (1) and (2) may be applied to the non-ferrous material pre- scribed in this Chapter.

2. Manufacturing control

(1) It is the manufacturer's responsibility to assure that effective process and production controls in operation are adhered to within the manufacturing specifications.

(2) Where control imperfection inducing possible inferior quality of product occurs, the manufacturer is to identify the cause and establish a countermeasure to prevent its recurrence. Also, the com- plete investigation report is to be submitted to the Surveyor. See Guidance

(3) For further use, each product affected by previous (2) is to be tested to the Surveyor's satisfaction. The frequency of testing for subsequent products offered may be increased to gain confidence in the quality at the discretion of the Society. See Guidance

(4) When steel is not produced at the works at which it is rolled, a certificate is to be supplied to the Surveyor at the rolling mill stating the process by which it was manufactured, the name of the manufacturer who supplied it, the number of the cast from which it was made and the ladle analysis. The Surveyor is to have access to the works at which the steel was produced.

103. Chemical composition

1. The chemical composition of samples taken from each ladle of each cast is to be determined by the manufacturer in an adequately equipped and competently staffed laboratory and is to comply

with the appropriate requirements for chemical composition provided in this Chapter.

Guidance

See

2. The Manufacturer’s declared analysis will be accepted subject to occasional checks if required by the Surveyor. See Guidance

3. Product analysis may be required where the final product chemistry is not well represented by the

analysis from the cast. See Guidance

104. Testing and inspection

1. The materials are to be tested and inspected in the presence of the Society‘s Surveyor except oth- erwise specially provided, and are to comply with the requirements in this Chapter.

2. The materials other than those prescribed in this Chapter are to be tested and inspected according to the specification for the testing approved in accordance with the requirements in 101. 2.

3. The Society may accept to omit the tests for materials having the appropriate certificates.

4. Where the materials are manufactured by the approval of quality assurance scheme specially speci- fied by the Society, a part or all of test and inspection in the presence of the Society's Surveyor may be omitted. See Guidance

105. Execution of testing and inspection

1. The manufacturers shall afford the Surveyor all necessary facilities and access to all relevant parts of the works to enable him to verify that the approved process is adhered to, for the selection of test materials, and the witnessing of tests, as required by the Rules, and for verifying the accuracy of the testing equipment.

2. All tests and inspections are to be carried out at the place of manufacture before dispatch. The test specimens and procedures are to be in accordance with Sec 2 of this chapter. All the test speci- mens are to be selected and stamped by the Surveyor and tested in his presence, unless otherwise agreed.

3. In the case of special order, the manufacturer is to show the order specifications, special require- ments, etc. of the materials to the Surveyor prior to the material test.

4. Surface inspection and verification of dimensions are the responsibility of the steel maker. The ac- ceptance by the Surveyor shall not absolve the steel maker from this responsibility.

106. Identification of materials

1. The manufacturer is to take a suitable measure for the identification of ingots, slabs, castings, forg- ings, and finished pieces, etc. which will enable the material to be traced to its original heat, roll, etc.

2. The steelmaker is to adopt a system for the identification of ingots, slabs and finished pieces which will enable the material to be traced to its original cast. The Surveyor is to be given full facilities for so tracing the material when required.

3. Where small products such as castings are manufactured in large numbers, modified arrangements for identification may be specially agreed with the Society.

107. Test certificates

1. The Certificate for Materials Inspection is to be issued to the materials that have been satisfactorily tested and inspected in accordance with the requirements in this Chapter.

2. The Certificate for Materials Inspection is to contain in addition to the dimensions and weight of steels at least the following particulars;

(1) Purchaser‘s name or purchaser's order number and if known the hull number for which the ma- terial is intended.

(2) Identification of the cast and rolled piece.

(3) Identification of the steelworks.

(4) Material grade mark

(5) Chemical composition (ladle analysis values of elements controlled by the requirements) and car- bon equivalent calculated by following a formula. (if required)

(6) For steel with a corrosion resistant steel designation the weight percentage of each element add- ed or intentionally controlled for improving corrosion resistance.

(7) Mechanical properties

(8) Condition of heat treatment (e.g. normalized or controlled roll except for as rolled)

(9) Deoxidization procedure is to be stated. (rimmed steel only)

3. Notwithstanding the previous provisions, the accepted material may be omitted the issue of the Certificate for Materials Inspection where the manufacturer supplies the Mill Sheets stated the re- quirement of the previous Par 2 for each accepted steel grade to the Surveyor for his signature. In this case, the manufacturer is to enter the following statement on the certificate to show that the steel material has been made by an approval process and that it has withstand satisfactory the re- quired tests. The following form of declaration will be accepted if stamped or printed on each test certificate with the name of the steel works in English or Korean, and is to be signed by the per- sonnel of the manufacturing shop in charge of product quality assurance or inspector.

"We hereby certify that the material has been made by an approval process and has been satisfac- torily tested in accordance with the Rules of Korean Register of Shipping."

108. Quality and repair of defects

1. All materials are to be free from surface or internal defects which would be prejudicial to their proper application in service. The surface finish is to be in accordance with good practice and any specific requirements of the approved plan.

2. In the event of any material proving unsatisfactory during subsequent working or fabrication, such material may be rejected, notwithstanding any previous satisfactory testing and/or certification where the Surveyor considers necessary.

3. Welding or other means for the purpose of repairing defects is not permitted, unless the extent and method of repair (including welding procedure and heat treatment) are approved by the Surveyor. The repair of defects is to be carried out in the presence of the Surveyor, unless otherwise agreed.

4. Where repair by grinding is carried out then the remaining plate thickness below the ground area must be within the allowable under thickness tolerance.

109. Retest procedures

1. Where a part of the results of any test except impact test does not comply with the requirements, but the remainders are satisfactory, additional test specimens twice in number may be taken from the same material and retests for the failed test may be carried out. In such a case, all of the test specimens are to comply with the requirements.

2. Impact test

(1) Where the result of the impact test is unsatisfactory, additional tests may be carried out, with the exception of the cases specified in (i) and (ii) below, by taking a set of test specimens out of the same piece from which the above-mentioned test specimens have been taken.

(i) The absorbed energy of all test specimens is under the required average absorbed energy.

(ii) The absorbed energy of two of the test specimens is under 70 % the required average ab- sorbed energy.

(2) In case of the previous (1), all pieces of the same lot from which the test specimens have been

taken, may be accepted, provided that the average absorbed energy of the six test specimens, including those which have been rejected as unsatisfactory, is not less than the required average

absorbed energy, and that not more than two individual results are lower than the required aver-

age absorbed energy and of these, not more than one result is below 70 % of the required aver- age absorbed energy.

3. If a heat treated material fails to meet the requirements in any test, retest and heat treatment may be allowed two times(three times including the first test). In this case, however, the material is not to be considered as having complied with the requirements, unless all tests fully comply with the test requirements.

4. If the percentage of elongation of any tension test specimen is less than that specified and any part

of fracture is outside the one-fourth of the gauge length from the centre of gauge length, the test is to be considered as invalid, and a retest for the material from which the first test specimen has been taken may be allowed. See Guidance

110. Marking

1. Every material complying with the requirements is to be clearly stamped with the Society's brand and material grade mark, and marked with the following particulars at least in one position by the maker:

(1) Name or mark to identify the steel works.

(2) Number or mark to identify the material.

(3) Name or mark to identify the purchaser. (if required by the purchaser)

2. Materials which have been specially approved by the Society in accordance with the requirements in 101. 2 are to have the letter "S" after the material grade mark.

3. Materials which are unsuitable for stamping may be marked with brands, seals or by other suitable means.

4. The marking particulars, but excluding the manufacturer's name or trade mark where this is em- bossed on finished products are to be encircled with paint or otherwise marked so as to be easily recognisable.

5. Materials which can not be stamped and marked in accordance with the requirements in Pars 1

and 2 due to small size may be properly marked in the lump.

6. Where a number of light materials are securely fastened together in bundles the manufacturer may,

subject to the agreement of the Society, brand only the top piece of each bundle, or

a firmly fastened durable label containing the brand may be attached to each bundle.

alternatively,

7. In the event of any material bearing the Society's brand failing to comply with the test require- ments, the brand is to be unmistakably defaced by the manufacturer.