JJG 831-2021
Hardness Testers for Casting Moulds of Sand (English Version)

Standard No.

JJG 831-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

National Metrological Verification Regulations of the People's Republic of China

Latest

JJG 831-2021

JJG 831-2021 history

• 2021 JJG 831-2021 Hardness Testers for Casting Moulds of Sand
• 1993 JJG 831-1993 Verification Regulation of Green sand Mould Surface Hardness Tester for Castings