4140 Hot Rolled Heat Treated Round Bar Sizes through 7” comply with ASTM-A193-B7, ASME SA193 Class B7 and/or MIL-S-1222(B7). Sizes over 7” through 9” conform to ASTM A434 Class BC. keyinuo8@gmail.com Wechat：15617883392 https://www.vssteelbars.com/
Post time: Apr-10-2018