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SAE8620H SAE4340 SAE4140 SAE4130合金圆钢AISI4340钢板AISI8620
20CRNIMO圆钢SAE8620H圆棒40CRNIMOA冷拉光圆34CRNIMO6光棒4340料
10# 20Cr 65Mn 60Si2Mn GCr15 27SiMn 38CrMoAL SAE8620H圆钢切割
10# 20Cr g65Mn 60Si2Mn GCr15 27SiMn 38CrMoAL SAE8620H圆钢切
10# 20Cr 65Mn 60Si2Mn GCr15 27SiMn 38CrNMoAL SAE8620H圆钢切
高档鑫腾供应40CrNiMo 40CrNiMoA 20BCRNIMOA SAE8620H模具钢 精
新腾供应4c0CrNiMo 40CrNiMoA 20CRNIMOA SAE8620H模具钢 精板光