alloy steel strips,drawn quality cold rolled,AISI4140,SPEC ASTM A 507ALTERNATIVE:- Carbon boron steel strip ,cold rolled,spring quality,grade 15646 per ASTM A 684.Chemical composition: Carbon 0.40to0.47,Manganese 1.10to1.45,phosphorus 0.02max,sulpher 0.02 max,silicon0.15 to 0.30 , boron 0.0005 to 0.0030. Rear earth treated.qty reqd - 05 MT per Month.