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合金结构钢Q295 Q345 Q390 Q420 Q460 A00202 A00302A00352 A00402 A00452 A00502 A01202 A10272A10352 A10422 20Mn2 30Mn2 35Mn2 40Mn2 45Mn250Mn2 20MnV 27SiMn 35SiMn 42SiMn A14202A14262 A14372 A70402 A70452 A70502A71402 A71452 A72202 20SiMn2MoV 25SiMn2MoV37SiMn2MoV 40B 45B 50B 40MnB 45MnB20MnMoB A73152 A73202