ASTM A387 Grade 5 Class 2, Grade 9 Class 2, Grade 11 Class 2, Grade 12 Class 2, Grade 22 Class 2, Grade 91 Class 2. ASME SA387 Grade 5 Class 2, Grade 9 Class 2, Grade 11 Class 2, Grade 12 Class 2, Grade 22 Class 2, Grade 91 Class 2. EN 10028 16Mo3, 13CrMo45, 10CrMo910; BS 1501 6 by admin. Adopt Standard ASTM A387. Related grades we could supply: