China abolished 253 mechanical industry standards
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The repealed mechanical industry standards relate to machine tools, molds, bearings, and welding, including: technical conditions for safety protection of foundry machinery (JB 5545-1991) and determination of hot cracking tendency of alloys for the determination of casting properties (JB/T 4022.2-1999). ,Coupling Crack Displacement COD Test Method (JB/T 4291-1999), Accelerometer Vibration Tester for Rolling Bearings (JB/T 8561-1997), Machine Cooling System Components High Head Cooling Pump (JB/T 8650.1 -1997), General forging module blank size and weight method (JB/T 5900-1991) and so on.
There are several reasons for the abolition: the methods prescribed by the standard do not have the conditions for application in production, and enterprises do not use this method in actual production; only individual companies use it and lose the attributes of the industry standard; the standard technology content is backward and the practicality is poor; The determination of the function and structure of the market is determined by the market, and the series of spectrum standards has lost its guiding function.