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C Cr Ni Co Mo Al Ti  
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Fe B Zr S P Mn Si  
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760 ≥870   ≥8 ≥10  
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800 ≥735 ≥635 ≥15 ≥20  
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GJB 3165-98  
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GJB 3317-98  
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¹Ü²Ä GB/T 15062-94  
GJB 2297-95  
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