A. spring steel: GB/T 1222,ASTM A689,JIS G4801,DIN 17221
size range: ?5.5-150, ?45-120,?6-40�  50-200

B. bearing steel: GB/T 18254,ASTM A295,JIS G4805,DIN EN ISO 683-17
size range: ?5.5-110

C. free cutting steel: GB/T 8731,ASTM A29,JIS G4804,DIN 16511
size range: ?5.5-150
commonly used for/in:accessories of sartorius,motor,machine,electronic products etc.

D. Anchor chain steel: GB/T 18669,ABS,NK,GL
size range: ?12-150

E. cold heading steel: GB/T 6478,ASTM A29,JIS G3507/ G3508,DIN 17111
size range: ?5.5-80

F. rillet steel: YB/T 5137,API SPECTCT ASME SA-210/ SA-213
size range: ?5.5-160

G. non-hardened and tempered steel: GB/T15712, ASTM A920,SEW 101
size range: ?5.5-150

H. steel with hardenability: GB/T 5216,ASTM A304,JIS G4052,DIN EN ISO 642
size range: ?5.5-150    

I. carbon steel for  constructual purposes: GB/T 699,ASTM A29/ A321/ A576,JIS G4051,DIN EN10083-2
size range: ?10-160, ?6-40�  50-200
commonly used for/in:various machine constructual accessories,metal product,tools, bridge,boiler,ship etc.

J. alloy constructual steel: GB/T 3077,ASTM A29/ A322,JIS G4102/ G4106,DIN EN10083-1
size range: ?5.5-150, ?6-40�  50-150
commonly used for/in:motor making,tractor,ship,turbine,machine,fastener etc.
K. cold work tool steel: AISI D2,AISI O1,AISI O2,  SKD11,SKS3,SKS93,  DC53,DC11,GOA,YK30,GO5
L. hot work tool steel: AISI H13,SKD61 ,SKT4,  DHA1,DH31-S,DH2F,GFA
M. plastic mold steel: AISI 1055,AISI P20, AISI P21,SUS420,  PXZ,PX4,S-STAR,D-STAR,NAK80
N. high speed tool steel: AISI M2, SKH51,  MH51
O. power high speed tool steel: DEX20