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45 narrative 40Cr steel quenched and tempered steel and heat treatment process

45 40Cr steel quenched and tempered steel and heat treatment process Quenched quenching and tempering of double heat treatment, which aims to make the workpiece has good mechanical properties.

Brief distinction commonly used standard parts and new and old GB GB between

The difference between the commonly used standard parts and new and old GB GB betweenIn the usual domestic business, the standard of our most frequently encountered is GB (GB) and DIN (German standard).

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