This Document specifies the expression methods of designation, ordering contents, manufacturing processes, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate for free-cutting structural steel. This Document applies to free-cutting structural steel bars, wire rods, wires, sheets, and strips (hereinafter referred to as steels) for machining. The chemical composition also applies to steel ingots, billets, and their products.
Basic Data
Standard ID
GB/T 8731-2025 (GB/T8731-2025)
Description (Translated English)
Free-cutting structural steels
Sector / Industry
National Standard (Recommended)
Classification of Chinese Standard
H40
Classification of International Standard
77.140.01
Word Count Estimation
26,223
Date of Issue
2025-10-31
Date of Implementation
2026-05-01
Older Standard (superseded by this standard)
GB/T 8731-2008
Issuing agency(ies)
State Administration for Market Regulation and Standardization Administration of China
