stainless steel square square steel Approved by ISO9001 Hot rolled steel round bar 4140 42CrMo4 Large diameter,good quality,competitive price,shipping quickly,Delivery condition:hot rolled+black surface1. Quality: AISI4140 Dia:12mm-300mm2. Standard Performed: ASTM A29/A29M-04 Equal Standard:America Standard: AISI4140International Standard: 42CrMo4Japan Standard: SCM440Germany Standard: 42CrMo43. ...