... Grade:SS400,S20C,S35C,S45C,S55C,SAE5140,SAE4140,etc hot rolled alloy round/square steel bar 1.Grade AISI4150 AISI4140 B16 S55B2.Specificaiton ... heat No. on each barSurface condition the surface of the hot rolled square bar shall befree cracks, scar and wrinkles that affect ... shall be within the limit stipulated in the contract. AISI4150 hot rolled alloy steel bar