... carbon alloy steel 20MnTiB 2.Property Class:8. Standard:GB/T 1228-1231,ISO7412,DIN6914-6916,ASME B 18 ... N quartile 40600 N.4, Adjusting quality: HRC34 °- 39 °.In add:But according to the clients sample production ... : HDG, Zinc, Black... Carbon steel: Grade/class 4.8, 5.8, 8.8, 10.9, 12.9... Stainless steel: SS201, SS304 ... size: 25" max.Grade: Metric size: 4.8,5.8,6.8,8.8,10.9, A2,A4 Inch.size: Gr2, Gr5 ...