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GB/T 18669-2012 English PDF (GBT18669-2012)

GB/T 18669-2012 English PDF (GBT18669-2012)

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GB/T 18669-2012: Steel bars for ship anchor chain

This Standard specifies the ordering content, dimensions, shape, weight and tolerances, designation, technical requirements, test methods, inspection rules, packaging, marking, and certification of steel bars for ship anchor chain. This Standard is applicable to hot-rolled steel bars for anchor chain with a diameter of 13 mm~190 mm.
GB/T 18669-2012
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.70
H 44
Replacing GB/T 18669-2002
Steel bars for ship anchor chain
ISSUED ON: NOVEMBER 05, 2012
IMPLEMENTED ON: MAY 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Ordering content ... 6
4 Designation representation method ... 6
5 Dimensions, shape, weight, and tolerances ... 6
6 Technical requirements ... 7
7 Test methods ... 10
8 Inspection rules ... 11
9 Packaging, marking, and certification ... 12
Appendix A (Informative) Correspondence table of steel grades and
designations of steel bars for anchor chain specified by various classification society codes ... 13
Steel bars for ship anchor chain
1 Scope
This Standard specifies the ordering content, dimensions, shape, weight and tolerances, designation, technical requirements, test methods, inspection rules, packaging, marking, and certification of steel bars for ship anchor chain. This Standard is applicable to hot-rolled steel bars for anchor chain (hereinafter referred to as steel bars) with a diameter of 13 mm~190 mm.
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are 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 aluminium 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 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - The Chromotropic Acid Photometric Method for the Determination of Titanium
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 4336 Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
YB/T 081 Rule for Rounding Off of Numerical Values and Judgement of
Testing Values for Technical Standards of Metallurgy
3 Ordering content
Contracts or orders for ordering in accordance with this Standard shall include the following:
a) Standard number;
b) Product name;
c) Designation;
d) Delivery state;
e) Dimensions;
f) Weight;
g) Special requirements.
4 Designation representation method
The designation of steel bars consists of the first letter ?€?C?€?, ?€?M?€? of Chinese pinyin of ?€?ship?€? and ?€?anchor?€? and the minimum tensile strength, for example, CM490. 5 Dimensions, shape, weight, and tolerances
5.1 Dimensions and tolerance
Dimensions and tolerance of steel bars shall comply with the provisions of GB/T 702.
5.2 Length and tolerance
According to the requirements of the purchaser, it may be delivered according to the fixed length and multiple length. The length tolerance is 0~+50 mm. A cleaning depth. The cleaning depth is calculated from the actual dimension and shall not exceed half of the tolerance. There shall be no more than one place where the maximum cleaning depth is reached on the same cross-section.
7 Test methods
7.1 Inspection items, sampling quantities, sampling methods, test
methods
The inspection items, sampling quantities, sampling methods, and test methods of each lot of steel bars shall comply with Table 4.
Table 4 -- Inspection items, sampling quantities, sampling methods, test methods
No. Inspection items
Sampling
quantities, pieces Sampling methods Test methods
1 Chemical composition 1/furnace GB/T 20066 GB/T 223 or GB/T 4336
2 Tensile test 1 GB/T 2975 and 7.2 GB/T 228.1
3 Bend test 1 GB/T 2975 GB/T 232
4 Impact test 3 GB/T 2975 and 7.2 GB/T 229
5 Macrostructure 2
Different steels
equivalent to the
ingot head
GB/T 226, GB/T 1979
6 Dimensions, shape Piece by piece -
Suitable measuring tools which
meet the accuracy requirements
7 Surface Piece by piece - Visual inspection
7.2 Sampling for tests of mechanical properties
7.2.1 For the steel bar with a diameter of not more than 40 mm, it shall retain the rolled surface of the steel bar. The tensile test shall be carried out without machining. When the testing machine is not capable enough, the sample is allowed to be turned. According to the provisions of GB/T 2975, cut the impact sample.
7.2.2 For the steel bar with a diameter greater than 40 mm, at the positions shown in Figure 1 and Figure 2, cut the tensile and impact samples.

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