ISO 9587:2007

Overview

ISO 9587:2007 provides a practical framework for reducing hydrogen embrittlement risk in iron and steel components through prescribed stress‑relief heat treatments prior to pretreatment and coating operations. The standard targets high‑strength steels (notably those with tensile strength ≥ 1 000 MPa) that may be susceptible to hydrogen charging during cleaning, electroplating, autocatalytic plating, chemical conversion or phosphating. It is intended to be referenced on drawings and procurement documents so applicators and coating specialists apply the correct mitigation measures.

Key Topics

• Scope and applicability: Applies to steels whose properties are not adversely affected by tempering in the approximate range 190 °C to 230 °C or higher. The standard does not apply to fasteners.
• Stress‑relief (degassing) heat treatments: Classes of treatments (SR classes) are provided to guide time‑temperature schedules for steels of differing tensile strengths and for parts with surface hardening. Where the client does not specify a class, SR‑1 is applied by default.
• Classification (practical examples from the standard):
  • SR‑1: For R > 1 800 MPa - typical treatment ≈ 200–230 °C for 24 h (default when unspecified).
  • SR‑3: For 1 401 ≤ R ≤ 1 800 MPa - ≈ 200–230 °C for 18 h.
  • SR‑6: For 1 000 ≤ R ≤ 1 400 MPa - ≈ 200–230 °C for 3 h.
  • SR‑8: For parts with superficial quench and R