... Top Quality 4. Standard: JIS/AISI/ASTM/GB,etc Characteristics: 1. Material grade:AISI 201,Y201Cu,202 AISI 303, 304, 304L,310,310S,316 ... ,316L,317,321 AISI 410,420,430,430F,431 ... Steel Bar( round, flat, angle, square, hexagonal bar).2) Standard: AISI,SUS,GB,JIS,ASTM,DIN etc.3) Grade: 200,300 ...