GB/T 27866-2023Specification of controlling weld hardness of steel pipe and equipment to prevent sulfide stress cracking (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 27866-2011 "Technical regulations for controlling the hardness of welds of steel pipes and equipment to prevent sulfide stress cracking" Standard", compared with GB/T 27866-2011, in addition to structural adjustments and editorial changes, the main technical changes are as follows:

a) The scope of application has been changed. This document is applicable to carbon steel and low alloy steel pipes and pipes with a specified minimum tensile strength not greater than 490MPa. Equipment manufacturing welds and construction welds (see Chapter 1, Chapter 1, 4.5 of the 2011 edition);

b) Added assessment requirements where hardness testing cannot be performed (see 4.3);

c) The base metal, welding materials, welding process parameter control and post-weld heat treatment technical requirements have been changed, and the welding material standards have been deleted (see section Chapter 5, 5.3, 5.4 and 5.5 of the 2011 edition);

d) Changed the Leeb hardness and Brinell hardness testing requirements (see 6.2.2, 6.2.8, 6.2.1 of the 2011 edition);

e) Figure 1 has been changed (see 6.3.3, 6.3.2 of the 2011 version);

f) Changed the weld repair and hardness testing and assessment (see Chapter 7, 6.2.6, 6.2.7 of the 2011 edition);

g) Added work content and flow chart for controlling weld hardness to prevent sulfide stress cracking (see Appendix A).

1 Scope

This document describes hardness control methods for preventing sulfide stress cracking (SSC) in welds of piping and equipment exposed to sour environments. Law, and stipulates the requirements for hardness control.

This document is applicable to the welding and construction of carbon steel and low alloy steel pipelines and equipment with a minimum tensile strength of no more than 490MPa. welds.

This document does not cover other types of rings that prevent stress-oriented hydrogen-induced cracking (SOHIC) and soft zone cracking (SZC) caused by hydrogen sulfide environments. The environment cracks.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 150.1 Pressure vessels Part 1: General requirements

GB/T 2654 Hardness test method for welded joints

GB/T 3965 Method for determination of diffusible hydrogen in deposited metal

GB/T 4340.1 Vickers hardness test of metallic materials Part 1: Test methods

GB 50251 Gas pipeline engineering design specifications

SY/T 0599 Technical specifications for metal materials resistant to sulfide stress cracking and stress corrosion cracking for natural gas surface facilities

SY/T 7024 Technical specifications for on-site hardness testing of metal materials in hydrogen sulfide-containing oil and gas fields

3 Terms and definitions

The following terms and definitions apply to this document.