ISO 6931-2-2005 PDF

Full title and description

Stainless steels for springs — Part 2: Narrow strip. This International Standard specifies requirements for cold-rolled narrow strip stainless steels intended for the manufacture of springs and spring components, including chemical composition, mechanical properties and required test methods.

Abstract

ISO 6931-2:2005 applies to cold-rolled narrow strip of stainless steel with thicknesses up to and including 3 mm and rolled widths less than 600 mm. It defines steel designations, cast-analysis limits, mechanical property requirements and sampling and test procedures relevant to spring manufacture from narrow strip.

General information

• Status: Published (International Standard; confirmed at latest systematic review).
• Publication date: April 2005 (Edition 2, 2005-04; published April 2005 / 22 April 2005 in catalog records).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.140.25 (Spring steels).
• Edition / version: Edition 2 (2005).
• Number of pages: 28 pages.

Scope

Specifies requirements for cold-rolled narrow strip made from stainless steels intended for springs: strip thicknesses up to and including 3 mm and rolled widths less than 600 mm. The standard covers chemical composition (cast analysis), mechanical properties (tensile, bend, coil-set), dimensions and sampling/test procedures relevant to spring production. It replaces the earlier 1989 edition for the same subject matter.

Key topics and requirements

• Steel grade designations and cast-analysis chemical composition limits for common stainless spring steels.
• Specified mechanical-property requirements (tensile strength, yield, elongation) for strip intended for springs.
• Dimensional limits and tolerances for narrow strip (thickness, width, coil form).
• Sampling rules for taking test specimens from coils and strip lengths.
• Test methods: tensile testing, bending tests (including transverse/longitudinal bending), coil-set measurement and related procedures.
• Requirements for delivery condition and conformity assessment relevant to spring manufacturers and suppliers.

The above topics are presented in the standard together with illustrations of test-piece orientation, tables of allowable chemical ranges and mechanical property classes.

Typical use and users

Primary users are stainless steel producers and mills supplying narrow strip, spring manufacturers and fabricators, materials and quality engineers, testing laboratories and procurement/specification writers who need standardized grades and test procedures for strip used to make springs and spring elements. Regulatory or conformity assessment bodies and standards committees addressing spring materials also reference this part.

Related standards

ISO 6931 is a multi-part series covering stainless steels for springs. Related/adjacent parts include ISO 6931‑1 (Stainless steels for springs — Part 1: Wire) and the earlier ISO 6931‑2:1989 which was superseded by the 2005 edition. Other standards referenced for general delivery requirements and testing practices (e.g., ISO general delivery requirements) may also be applicable.

Keywords

stainless steel; spring steels; narrow strip; cold-rolled strip; coil set; tensile test; bending test; chemical composition; ISO/TC 17/SC 4; 77.140.25.

FAQ

Q: What is this standard?

A: ISO 6931-2:2005 is the International Standard that specifies requirements for stainless steels intended for springs supplied as cold-rolled narrow strip (thickness up to 3 mm, rolled widths < 600 mm).

Q: What does it cover?

A: It covers steel grade designations, cast-analysis chemical limits, mechanical property requirements (tensile, bending, coil-set), dimensional tolerances, sampling and the test methods used to confirm conformity for narrow strip used in springs.

Q: Who typically uses it?

A: Steel mills, spring manufacturers, material and quality engineers, testing laboratories, procurement/specifiers and standards committees involved with spring materials and components.

Q: Is it current or superseded?

A: The 2005 edition (Edition 2) is the published version and was reviewed and confirmed in ISO's systematic review process (confirmation recorded in 2021); it replaced the 1989 edition. Users should check ISO or their national standards body for the very latest status before formal procurement.

Q: Is it part of a series?

A: Yes — ISO 6931 is a multi-part series addressing stainless steels for springs (for example, ISO 6931‑1 covers wire). The parts share the common ICS classification 77.140.25 and are maintained by ISO/TC 17/SC 4.

Q: What are the key keywords?

A: spring steels, stainless steel, narrow strip, cold-rolled, coil set, tensile strength, bending test, ISO 6931.