ISO 2232:2022

Overview

ISO 2232:2022 specifies requirements for round non‑alloy steel wires used in the manufacture of general‑purpose, large‑diameter and mine‑hoisting wire ropes. The standard covers wires of nominal diameters 0.2 mm to 7.0 mm, in bright, zinc (Zn) or zinc/aluminium (Zn/Al) alloy coated finishes, and in quality A or B. It sets out dimensional tolerances, mechanical characteristics, coating requirements, sampling and control procedures, and acceptance criteria for new wire (not wire taken from manufactured ropes).

Key topics and technical requirements

• Diameter and ovality: Nominal vs actual diameter measurement and allowable tolerances (tolerance bands vary by diameter, finish and quality). Ovality limits are defined by the permitted difference between two diameter measurements.
• Tensile grades: Defined minimum tensile strengths include 1 570, 1 770, 1 960, 2 160, 2 260 and 2 360 MPa (with upper tolerances depending on diameter). Additional grades may be agreed between supplier and purchaser.
• Reverse‑bend and torsion performance: Minimum reverse‑bend counts, support radii, and torsion test requirements are specified according to wire diameter, tensile grade and finish to ensure fatigue resistance in rope manufacture.
• Coating specifications: Requirements for hot‑dip or electrolytic zinc and Zn/Al alloy coatings, including mass per unit area and adhesion tests (see normative Annexes for coating mass determination and adhesion testing).
• Sampling, tests and acceptance: Defined sampling units, test lengths and procedures for measurement of diameter, tensile tests, reverse‑bend tests, torsion tests and coating inspection. Certificates and marking requirements are included for traceability and conformity.

Practical applications and users

ISO 2232:2022 is intended for:

• Steel wire manufacturers producing wire for rope applications.
• Wire rope manufacturers specifying wire feedstock for general, large‑diameter and mine hoisting ropes.
• Quality and test laboratories conducting tensile, bend, torsion and coating tests.
• Purchasing and specification engineers in mining, marine, construction and lifting industries who need assured wire performance and traceability.
• Regulatory and conformity bodies verifying acceptance criteria and certificates.

This standard is particularly relevant where fatigue performance, dimensional control and coating corrosion protection are critical - for example in mine hoisting ropes and heavy‑duty outdoor rope applications.

Related standards

• ISO 2408:2017 (wire rope - general requirements)
• ISO 3154:1988 (mine hoisting wire ropes)
• ISO 16120-1 (wire rod for conversion to wire)
• ISO 6892-1, ISO 7800, ISO 7801, ISO 7802 (test methods)
• ISO 1460 (gravimetric determination of zinc coating mass)

Keywords: ISO 2232, round non‑alloy steel wires, wire ropes, mine hoisting, tensile grades, zinc coating, Zn/Al, dimensional tolerances, reverse bend strength, wire testing.