GB/T 18669-2025 PDF English
US$320.00 · In stock · Download in 9 secondsGB/T 18669-2025: Steel for ship anchor chain and offshore mooring chain cables Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 18669: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18669-2025 | English | 320 |
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Steel for ship anchor chain and offshore mooring chain cables
| Valid |
| GB/T 18669-2012 | English | 70 |
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Steel bars for ship anchor chain
| Valid |
| GB/T 18669-2002 | English | 120 |
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Steel bars for ship anchor chain
| Obsolete |
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GB/T 18669-2025: Steel for ship anchor chain and offshore mooring chain cables---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18669-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.70
CCS H 44
Replacing GB/T 18669-2012, GB/T 32969-2016
Steel for ship anchor chain and offshore mooring chain
cables
Issued on: JUNE 30, 2025
Implemented on: JANUARY 01, 2026
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 Grades and codes... 8
5 Ording contents... 8
6 Dimensions, shape, weight... 9
7 Technical requirements... 10
8 Test methods... 17
9 Inspection rules... 20
10 Packaging, marking and quality certificate... 21
Annex A (normative) Diameter and allowable deviation of steel for offshore mooring
chain cables... 22
Annex B (informative) Comparison on designations of steel for ship anchor chain and
steel for offshore mooring chain cables of various classification societies... 23
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document is a consolidated revision of GB/T 18669-2012 and GB/T 32969-2016.
It replaces GB/T 18669-2012 "Steel bars for ship anchor chain" and GB/T 32969-2016
"Steel for offshore mooring chain cables". In addition to structural adjustments and
editorial changes, compared to GB/T 18669-2012 and GB/T 32969-2016, the main
technical changes are as follows.
- The scope has been changed. The grades and codes for Grade 4 anchor chain steel
have been added, as have grades and codes for Grade 6 steel for offshore mooring
chain cables (see Chapter 1 of this Edition; Chapter 1 of GB/T 18669-2012 and
Chapter 1 of GB/T 32969-2016);
- The grades and codes have been changed (see Chapter 4 of this Edition; Chapter 4
of GB/T 32969-2016);
- The designation method has been deleted (see Chapter 4 of GB/T 18669-2012);
- The end shape has been changed (see 6.3 of this Edition; 5.3.3 of GB/T 18669-
2012 and 6.3 of GB/T 32969-2016);
- The chemical composition has been changed (see Tables 3 and 4 of this Edition;
Table 2 of GB/T 18669-2012 and Table 3 of GB/T 32969-2016);
- Manufacturing method has been changed (see 7.2 of this Edition; 6.2 of GB/T
18669-2012 and 7.2 of GB/T 32969-2016);
- Delivery condition has been changed (see 7.3 of this Edition; 6.3 of GB/T 18669-
2012 and 7.3 of GB/T 32969-2016);
- Mechanical properties have been changed (see Tables 6 and 7 of this Edition; Table
3 of GB/T 18669-2012 and Table 5 of GB/T 32969-2016);
- Macro-magnification has been changed (see 7.6 of this Edition; 7.7 of GB/T 32969-
2016);
- Non-metallic inclusions have been changed (see 7.7 of this Edition; 7.8 of GB/T
32969-2016);
- The sampling requirements for mechanical properties tests have been changed (see
8.2 of this Edition; 7.3 of GB/T 18669-2012 and 8.2 of GB/T 32969-2016);
- The hydrogen embrittlement of steel for offshore mooring chain cables has been
Steel for ship anchor chain and offshore mooring chain
cables
1 Scope
This document specifies the grades and codes, ordering contents, dimensions,
appearance, weight, technical requirements, test methods, inspection rules, packaging,
marking and quality certificates for steel for ship anchor chain (grades M2, M3, M4)
and steel for offshore mooring chain cables (grades R3, R3S, R4, R4S, R5, R6).
This document is applicable to hot-rolled steel for ship anchor chain with a nominal
diameter of 13 mm~225 mm and hot-rolled steel for offshore mooring chain cables with
a nominal diameter of 30 mm~250 mm for floating production systems, semi-
submersible drilling platforms, single-point mooring chain structures, floating
production storage and offloading vessels and other marine development facilities
(hereinafter referred to as round steel).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
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 223.11, Iron, steel and alloy -- Determination of chromium content -- Visual
titration or potentiometric titration method
GB/T 223.14, Methods for chemical analysis of iron, steel and alloy. The N-benzoyl-
N-phenylhydroxylamine extraction photometric method for the determination of
vanadium content
GB/T 223.17, Methods for chemical analysis of iron, steel and alloy -- The
diantipyrylmethane photometric method for the determination of titanium content
GB/T 223.23, Iron, steel and alloy -- Determination of nickel content -- The
temperature
GB/T 229, Metallic materials - Charpy pendulum impact test method
GB/T 231.1, Metallic materials -- Brinell hardness test -- Part 1.Test method
GB/T 232, Metallic materials -- Bend testing method
GB/T 1979, Standard diagrams for macrostructure and defect of structural steels
GB/T 2101, General Requirement of Acceptance, Packaging, Marking and
Certification for Section Steel
GB/T 2975, Steel and steel products -- Location and preparation of samples and test
pieces for mechanical testing
GB/T 4162-2022, Method for ultrasonic testing of forged and rolled steel bars
GB/T 4336, Carbon and low-alloy steel -- Determination of multielement contents -
- Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394, Determination of estimating the average grain size of metal
GB/T 8170-2008, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 10561-2023, Determination of content of nonmetallic inclusions in steel -
Micrographic method using standard diagrams
GB/T 11260, Method for eddy current testing of round steel
GB/T 11261, Steel and Iron -- Determination of Oxygen Content -- The Pulse
Heating Inert Gas Fusion-Infrared Absorption Method
GB/T 20066, Steel and iron -- Sampling and preparation of samples for the
determination of chemical composition
GB/T 20123, Steel and iron -- Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)
GB/T 20124, Steel and iron -- Determination of nitrogen content -- Thermal
conductimetric method after fusion in a current of inert gas
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 steel for ship anchor chain
Round steel used in the manufacture of ship anchor chains.
3.2 steel for offshore mooring chain cables
Round steel used in the manufacture of mooring chains.
3.3 black surface steel
Hot rolled or annealed material with unpeeled surface.
3.4 flake steel
Round steel that has been peeled by a grinding wheel or peeled by turning.
4 Grades and codes
Round steel is divided into different grades and codes according to its tensile strength
index, see Table 1.
5 Ording contents
Contracts or orders for goods ordered under this document must include at least the
following.
a) Reference to this document;
b) Product name;
c) Designation;
d) Specification;
e) Weight (or quantity);
f) Surface finish, e.g., black surface steel or flake steel;
g) Heat-treated finish, e.g., hot-rolled or annealed;
h) Special requirements.
6 Dimensions, shape, weight
6.1 Dimensions, shapes and tolerances
The dimensions, shape and permissible deviation of round steel shall comply with the
provisions of Table 2.Upon negotiation between the supplier and the purchaser and
with indication in the contract, the diameter and permissible deviation of steel for
offshore mooring chain cables may also be delivered in accordance with Annex A.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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