... ,8620,8640,1020,4320,52100,5135 AISI H11,H10,H13,D2,D6,O1,A2,S1,S5,S7,M2,L2 ... , flat steel, square steel, die steel, spring steel, carbon tool steel, stainless steel, alloy steel, high speed steel, carbon structural steel, hot-rolled bar, hot-rolled wire rod, forged steel, cold- ... Beijing. P.C.:100121Tel:010-51201667 Fax:51201677 steel stock alloy tool steel H13 SAE 4140,4340,1045,8620,8640,1020,4320, ...