GB/T 3620.2-2023Titanium and titanium alloy permissible variations of chemical composition for wrought product analysis (English PDF)

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 3620.2-2007 Titanium and Titanium Alloys - Permissible Variations of Chemical Composition for Wrought Product Analysis. In comparison with GB/T 3620.2-2007, apart from structural adjustments and editorial modifications, the main technical changes are as follows.

a) The content of the Scope is modified (see Chapter 1; Chapter 1 of Version 2007);

b) The general principles of sampling are deleted (see 4.1 of Version 2007);

c) The description of the applicability of the permissible variations of chemical composition is added (see 4.1.2);

d) The permissible variations of the element W are added (see 4.1.3);

e) The permissible variations of the elements O, Al, Cr, Mo, Mn, Cu, B, Zr and Y are modified (see 4.1.3; 4.4.3 of Version 2007);

f) The requirements for sampling locations are modified (see 4.2; 4.2 of Version 2007);

g) The analysis method YS/T 1262 for chemical composition is added (see 4.3).

This document was firstly issued in 1983, firstly revised in 1994 and secondly revised in 2007. This is the third revision.

1 Scope

This document specifies the permissible variations of chemical composition for titanium and titanium alloy wrought product (plates, strips, foils, pipes, bars, wires, forgings, profiles and castings).

This document is applicable to the demand-side's check analysis and arbitration analysis of the chemical composition of the product.

This document does not apply to the supply-side's analysis of the chemical composition of the product, nor does it apply to the check analysis of changes in the content of impurity elements (such as hydrogen, nitrogen and oxygen) caused by the demand-side's reprocessing of the product.

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 4698 (all parts) Methods for Chemical Analysis of Titanium Sponge, Titanium and Titanium Alloys

GB/T 31981 Methods of Sampling and Sample Preparation for Chemical Composition Analysis of Titanium and Titanium Alloy

3 Terms and Definitions

The following terms and definitions are applicable to this document.

4 Technical Requirements