ISO 26910-1:2023

Overview - ISO 26910-1:2023 (Springs - Shot peening - Part 1: General procedures)

ISO 26910-1:2023 specifies general requirements and procedures for applying shot peening to springs to improve resistance to fatigue and stress corrosion cracking. The standard focuses on introducing compressive residual stresses in surface layers through controlled peening, and establishes common definitions, measurement methods and process controls to ensure repeatable, verifiable results across the spring industry.

Key topics and technical requirements

• Scope and purpose: Defines the intent of shot peening for springs - primarily to enhance fatigue life and reduce stress corrosion cracking by work hardening and compressive residual stresses.
• Terms and definitions: Standardizes vocabulary (e.g., shot peening, peening media, Almen strip, Almen arc height, saturation time, coverage, peening intensity).
• Modes of peening: Describes allowable modes including ordinary peening, multi-stage peening, stress peening, hot peening, heavy peening, and fine peening.
  • Ordinary peening: Almen arc height typically between 0.15 mm and 0.6 mm (A).
  • Heavy peening: Almen arc height > 0.6 mm (A).
  • Fine peening: Almen arc height