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合金无缝钢管GB6479-86 
20G 15CrMo 12Cr1MoV 
35,43,49,55,60,63.5,68x3-12 
73,76,83,89,102,108,114x4-18 
121,127,139,146,152,159,177.8x5-25 
194.5,203,219.14,244.5,273,299,325x10-28 
351,377,406,426,450,480x10-36