GB/T 39989-2021Superelastic titanium-nickel shape memory alloy bar and wire (English PDF)

1 Scope

This document specifies the technical requirements, test methods, inspection rules, marking, packing, transporting, storing, accompanying documents and order form content for superelastic titanium-nickel shape memory alloy bar and wire.

This document is applicable to round and rectangular superelastic titanium-nickel shape memory alloy bar and wire used for making spectacle frames, orthopedic wires, guide wires, communication antennas, and for construction industry and power industry, etc.

2 Normative references

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

GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1: Method of test at room temperature

GB/T 3620.2 Titanium and titanium alloys - Permissible variations of chemical composition for wrought product analysis

GB/T 4698 (all parts) Methods for chemical analysis of titanium sponge, titanium and titanium alloys

GB/T 5168 Microstructure and macrostructure examination for titanium and titanium alloys

GB/T 6394-2017 Determination of estimating the average grain size of metal

GB/T 8180 Wrought titanium and titanium alloy products packing, marking, transporting and storing

GB/T 23614.1 Methods for chemical analysis of titanium nickel shape memory alloy - Part 1: Determination of nickel content - Dimethylglyoxime

5 Test methods

5.6 The appearance quality shall be inspected visually. When necessary, use a magnifying glass of not less than 10 times to inspect.

5.7 The superelasticity shall be inspected in accordance with the provisions of Appendix A.

6 Inspection rules

6.5.4 When the macrostructure inspection is nonconformity, the supplier is allowed to inspect stick by stick (roll by roll/coil by coil), remove the defects, and deliver the conformity ones.

6.5.5 When the average grain size or microstructure inspection is nonconformity, the supplier is allowed to inspect the rest stick by stick (roll by roll/coil by coil). And the conformity ones will be delivered.

7 Marking, packing, transporting, storing, and accompanying documents

8 Order form content

The order form for the products listed in this document shall include the following content:

a) Product name;

b) Designation and supply state;

c) Product specifications;

d) Quantity or weight;

e) Other requirements;

f) Number of this document. […]