GB/T 4157-2017Laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion cracking in H2S environment (English PDF)

1 Scope

This standard specifies the low pH aqueous solution containing H2S environment, the metal material under tensile stress resistance to sulfide stress

Laboratory testing methods for cracking (SSC) and stress corrosion cracking (SCC).

This standard specifies the test reagents, test equipment, sample preparation methods and test procedures and other requirements. This standard includes five tests method.

--- Method A. Tensile test;

--- Method B. Three-point bending test;

--- Method CC ring test;

--- Method D. Double Cantilever (DCB) test;

--- Method E. Four-point bending test.

The test methods specified in this standard include anti-SSC and SCC tests of metals at ambient temperature and pressure and at elevated temperatures and pressures.

This standard applies to.

a) Acceptance test to meet the requirements of the standard test, or products meet the minimum requirements of anti-environmental cracking (EC) performance of product acceptance

Assessment test.

b) Quantitative tests to provide studies or data on the resistance of products to EC. The information provided by different test methods is as follows.

--- Method A.720h does not fail the highest uniaxial tensile stress;

--- Method B.720h based on the statistical probability of 50% failure of the critical stress (Sc) value;

--- Method C.720h does not fail the highest hoop stress;

--- Method D. Average KISSC (Critical Stress Field Intensity Factor for SSC) of valid specimens in duplicate test specimens;

--- Method E.720h does not fail the highest tensile stress.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 228.1 tensile testing of metallic materials - Part 1. room temperature test method

GB/T 228.2 Tensile testing of metallic materials - Part 2. High temperature test methods

GB/T 230.1 Metallic materials Rockwell hardness test Part 1. Test methods (A, B, C, D, E, F, G, H, K, N, T scale)

GB/T 1031 Geometrical product specifications (GPS) Surface texture Profile method Surface roughness parameters and their values

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

Laboratory use specifications and test methods for analysis of GB/T 6682-2008

GB/T 10123 metals and alloys corrosion basic terms and definitions

GB/T 11060.1 Determination of sulfur compounds in natural gas - Part 1. Determination of hydrogen sulfide content by iodometric method

GB/T 15970.5 metal and alloy corrosion stress corrosion test - Part 5. Preparation and application of C-ring sample

GB/T 16825.1 static uniaxial testing machine test Part 1. Tensile and (or) pressure testing machine testing system and force measurement calibration […]