SIST EN ISO 16859-3:2016 PDF

Overview

EN ISO 16859-3:2015 (CEN adoption) defines the method for the calibration of Leeb reference test blocks used in the indirect verification of Leeb hardness testers (per ISO 16859‑2) and for periodic checking (per ISO 16859‑1). The standard also specifies procedures to ensure metrological traceability of the Leeb hardness calibration machine and requirements that support consistent, traceable Leeb hardness measurements on metallic materials.

Key topics and technical requirements

• Purpose: Calibration method for specially manufactured reference test blocks used with Leeb impact hardness testing.
• Reference block manufacture: Blocks must be free from magnetism, have high surface quality (mean surface roughness Ra ≤ 0.1 µm), and meet flatness and parallelism limits (flatness deviation ≤ 0.01 mm; parallelism ≤ 0.02 mm per 50 mm).
• Minimum dimensions/mass (examples from the standard):
  • Common impact devices D, DL, D+15, S, E, C: min thickness 33 mm, diameter 85 mm, mass 2.7 kg.
  • Impact device G: min thickness 65 mm, diameter 115 mm, mass 6.0 kg.
• Calibration machine requirements:
  • Resolution equal to or better than 1.0 HL.
  • Calibration interval: **