OP20 normalizing treatment (outsourcing) <br>Testing method: Brinell hardness tester <br>Testing frequency: 2 pieces/each batch <br>Control method: Three-self three-inspection record <br>OP25 storage inspection <br>testing method: Brinell hardness tester <br>Testing frequency: 1 piece/each batch <br>Control means: warehousing inspection records
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