GB/T 712-2022 PDF English
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| GB/T 712-2022 | English | 395 |
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Structural steel for ship and ocean engineering
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| GB 712-2011 | English | 85 |
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[GB/T 712-2011] Ship and ocean engineering structural steel
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Hull structural steel
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 712-2011
Structural Steel for Ship and Ocean Engineering
Issued on. OCTOBER 12, 2022
Implemented on. MAY 1, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 7
4 Classification and Designations... 7
5 Order Content... 8
6 Dimensions, Shapes and Weights... 8
7 Technical Requirements... 9
8 Test Methods... 21
9 Inspection Rules... 23
10 Packaging, Marking and Quality Certificate... 26
Appendix A (informative) Correspondence of Each Steel Grade and Designation
Specified in the Regulations of Each Classification Society... 27
Appendix B (normative) Steel Designations, Delivery Status and Batch Size for Impact
Test... 31
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 712-2011 Ship and Ocean Engineering
Structural Steel. In comparison with GB/T 712-2011, apart from structural adjustments and
editorial modifications, the main technical changes are as follows.
a) The applicable thickness range of structural steel for ocean engineering is modified
(see Chapter 1; Chapter 1 of Version 2011);
b) A total of 3 steel grades and 10 designations of ultra-high strength 790, 890 and 960
are added (see Chapter 4);
c) The requirements for the average thickness of steel plates are added (see 6.1);
d) The requirements for the chemical composition of ultra-high strength grade steel are
modified (see Table 4; Table 4 of Version 2011);
e) The requirements for carbon equivalent of ultra-high strength steel are added (see
Table 5);
f) The requirements for vacuum degassing treatment of ultra-high strength grade steel
with through-thickness properties and 690, 790, 890 and 960 grade steel with non-
through-thickness properties are added (see 7.2);
g) The requirements for the rolling compression ratio of continuous cast billets and steel
ingots are added (see 7.2);
h) The requirements for the mechanical properties of ultra-high strength grade steel are
modified (see Table 7; Table 6 of Version 2011);
i) The requirements for the grain size of ultra-high strength grade steel are added (see
7.5);
j) The measurement method for the average thickness of steel plates is added (see 8.2);
k) The requirements for the sampling location of ultra-high strength grade steel are
modified (see 8.3; 7.4 of Version 2011);
l) The requirements for the batching of ultra-high strength grade steel are modified (see
9.2; 7.3 of Version 2011);
m) The requirements for impact inspection lot of ultra-high strength grade steel are
modified (see Appendix B; Appendix A of Version 2011);
n) Controlled rolling (CR) is modified (see Appendix B; Appendix A of Version 2011).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Iron and Steel Association.
This document shall be under the jurisdiction of National Technical Committee 183 on Steel of
Standardization Administration of China (SAC/TC 183).
The drafting organizations of this document. Angang Steel Company Limited; China
Metallurgical Information and Standardization Institute; Xinyu Iron & Steel Co., Ltd.; Hunan
Valin Xiangtan Iron & Steel Co., Ltd.; Jiangyin Xingcheng Special Steel Co., Ltd.; Hebei
Puyang Steel Co., Ltd.; Nanjing Iron and Steel Group Co., Ltd.; Bensteel Group Co., Ltd.;
Zhongke Xiwang Special Steel Co., Ltd.; Guangxi Liuzhou Steel Group Co., Ltd.; Laiwu
Branch of Shandong Iron and Steel Co., Ltd.; Qingdao NCS Testing Protection Technology Co.,
Ltd.; Shougang Group Co., Ltd.; China Classification Society; Guangdong Shao Steel
Songshan Co., Ltd.
The main drafters of this document. Wang Hua, Guan Jichun, Pu Zhimin, Zhang Weixu, Sun
Menghan, Xiong Wenming, Yang Jianhua, Meng Yu, Wang Zhicong, Jin Xing, Huang Jianguo,
Zhang Jian, Wei Sheng, Wang Zhongxue, Ding Guoqing, Di Guobiao, Zhao Jie, Qiu Wensheng,
Yan Ling, Chen Hua, Zhang Peng, Tian Zijian, Liu Zhifang, Zhou Wenhao, Liu Guanyou, Chen
Jianchao, Yin Zhijun, Ren Changpo, Xin Shiqi, Yuan Qinpan, Zhang Pei, Yang Haiyang, Qin
Liye, Gao Xuhui.
This document was firstly issued in 1965, firstly revised in 1979, secondly revised in 1988,
thirdly revised in 2000 and fourthly revised in 2011.This is the fifth revision.
Structural Steel for Ship and Ocean Engineering
1 Scope
This document specifies the classification and designations, order content, dimensions, shapes,
weights, technical requirements, test methods, inspection rules, packaging, marking and quality
certificate of structural steel for ship and ocean engineering.
This document is applicable to steel plates (with a thickness of not greater than 150 mm) for
the manufacturing of hull structures, such as. ocean-going, coastal and inland navigation ships
and fishing boats, etc., steel plates (with a thickness of not greater than 250 mm) for ocean
engineering structures, steel strips and shear plates with a thickness of not greater than 25.4 mm,
and profile steel with a thickness of not greater than 50 mm or steel bars with a diameter of not
greater than 50 mm (hereinafter referred to as the steel).
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon Content -
Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum Content - Chrome Azurol S
Photometric Method
GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Carbonate
Separation-diphenyl Carbazide Photometric Method for the Determination of Chromium
Content
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-benzoy-N-
phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium
Content
GB/T 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy - The Neocuproine-
chloroform Extraction Photometric Method for the Determination of Copper Content
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime
Spectrophotometric Method
GB/T 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime
Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate
Spectrophotometric Method
GB/T 223.37 Iron, Steel and Alloy - Determination of Nitrogen Content - Indophenol Blue
Spectrophotometric Method after Distillation Separation
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl Acetate
Extraction Photometric Method for the Determination of Phosphorus Content
GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium (potassium)
Periodate Photometric Method for the Determination of Manganese Content
GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content - Methylene Blue
Spectrophotometric Method
3 Terms and Definitions
The terms and definitions defined in GB/T 1591 are applicable to this document.
4 Classification and Designations
4.1 The classification and designations of the steel shall comply with the stipulations of Table 1.
4.2 When there are requirements for the through-thickness properties of the steel, the symbols
for the required levels of through-thickness properties (Z25 and Z35) shall be added after the
designations in Table 1.
5 Order Content
5.1 A contract or order based on this document shall include the following contents.
5.2 If the order contract does not specify the contents of items 5.1e) ~ g), the supply-side may
determine them on its own.
6 Dimensions, Shapes and Weights
6.1 The dimensions, shapes, weights and allowable deviations of steel plates and steel strips
shall comply with the stipulations of GB/T 709.
6.2 The dimensions, shapes, weights and allowable deviations of profiles and bars shall comply
with the stipulations of the corresponding standards.
7 Technical Requirements
7.1 Designations and Chemical Compositions
7.1.1 The designations and chemical compositions (smelting analysis) of the general-strength
and high-strength steels shall comply with the stipulations of Table 2.
7.1.2 The designations and chemical compositions (smelting analysis) of the ultra-high strength
grade steel shall comply with the stipulations of Table 4.The carbon equivalent (Ceq) of ultra-
high strength grade steel shall comply with the stipulations of Table 5.
7.2 Manufacturing Method
7.2.1 Steel is smelted in a converter or electric arc furnace, and when necessary, shall be refined
outside the furnace. For 420 MPa and above steel grades with through-thickness properties and
690 MPa and above steel grades with non-through-thickness properties, vacuum degassing
treatment shall be carried out.
7.2.2 Unless otherwise specified, for 420 MPa and above steel grades, the rolling compression
ratio of continuous casting billets and steel ingots shall not be less than 3.
7.3 Delivery Status
The delivery status of the steels shall comply with the stipulations of Appendix B.
7.4 Mechanical Properties
7.5 Metallographic Examination
The grain size of ultra-high strength grade steels shall be Level-6 or finer. If the supply-side can
guarantee it, the inspection is not required.
7.6 Surface Quality
7.6.1 There shall be no harmful defects, such as. bubbles, scars, cracks, folds, inclusions and
pressed iron oxide scales, on the surface of the steels. There shall be no visible delamination of
the steels.
7.6.2 The surface of the steels is allowed to have thin layers of iron oxide scales and rust that
a For the tensile test and impact test of plates, take transverse specimens; for the tensile test and impact test of profiles and
bars, take longitudinal specimens.
7.6.3 Surface defects of the steels are allowed to be removed by grinding. The cleaned area
shall be smooth and without edges. The thickness reduction shall not be greater than 7% of the
nominal thickness and not greater than 3 mm,
7.7 Non-destructive Inspection
7.7.1 Steel plates with through-thickness properties shall be subjected to ultrasonic inspection.
The inspection method is GB/T 2970 or other methods. The test method and qualification level
shall be indicated in the contract.
7.7.2 In accordance with the requirements of the demand-side, through negotiation between the
supply-side and the demand-side, and statement in the contract, other steel plates may also be
subjected to non-destructive inspection.
8 Test Methods
8.1 Chemical Composition
Generally speaking, the chemical composition of steel shall be tested in accordance with GB/T
4336, GB/T 20123, GB/T 20124, GB/T 20125 or other universal methods.
8.2 Thickness Measurement
8.2.1 The thickness measurement parts of steel plates and steel strips shall comply with the
stipulations of GB/T 709.
8.2.2 The average thickness measurement method for the steel plates.
a) The average thickness of the steel plates may be automatically or manually measured;
8.3 Sampling Location
8.3.1 Specimens for the tensile test shall be taken from the thickest steel in each batch. When
the thickness of the steel is not greater than 40 mm, take a full-section rectangular specimen,
with a specimen width of 25 mm. When the testing machine has insufficient capacity, process
on one rolling surface of the specimen to reduce the thickness to 25 mm.
8.4 Test Methods for Inspection Items
The test methods for the inspection items of each batch of steels shall comply with the
stipulations of Table 9.
9 Inspection Rules
9.1 Inspection and Acceptance
The inspection and acceptance of the steels shall be carried out by the supply-side’s quality
inspection department.
9.2 Batching Rules
9.2.1 Steels shall be accepted in batches. For general-strength and high-strength steel grades,
each batch shall be composed of steels of the same designation, the same heat number, the same
delivery status, and with a thickness difference (or diameter difference) less than 10 mm; for
ultra-high strength steels, each batch shall be composed of steels of the same designation, the
same heat number, the same delivery status, and the same thickness (or the same diameter).
9.2.2 In terms of the tensile test, for general-strength and high-strength steel grades, the weight
of each batch of steels is not greater than 50 t; for ultra-high strength steel grades, the weight
of each batch of steels is not greater than 25 t. In terms of the impact test, the batch size shall
comply with the stipulations of Appendix B.
9.2.3 Steels with through-thickness properties shall be accepted as rolled billets. When the
sulfur content of Z25 steel is not greater than 0.005%, it can be inspected in batches, and the
weight of each batch is not greater than 50 t.
9.3 Sampling Quantity
The sampling quantity and sampling method of each batch of steels are shown in Table 9.
9.4 Re-inspection and Determination
9.4.1 Re-inspection and determination of tensile test
The re-inspection and determination of the tensile test of the steels shall comply with the
stipulations of GB/T 17505.
9.4.2 Re-inspection and determination of reduction of area in thickness direction of steels
with through-thickness properties
Figure 2 specifies three situations, in which, re-inspection is allowed. Under these
circumstances, the remaining 3 spare specimens need to be tested. The average value of 6
specimens shall be greater than the specified minimum average value, and the results below the
average value shall not be more than 2 but shall not be lower than the minimum single value
specified in Table 8, otherwise, the batch of steels will not be accepted.
9.4.3 Re-inspection and determination of impact test
9.4.4 Re-inspection and determination of grain size
The re-inspection and determination of steel grain size shall comply with the stipulations of GB/T 17505.
9.4.5 Re-heat treatment
Steels that failed the re-inspection are allowed to be re-heated and submitted for acceptance as a new batch.
10 Packaging, Marking and Quality Certificate
The packaging, marking and quality certificate of the steels shall comply with the stipulations
of GB/T 247 or GB/T 2101.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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