Avail from us high grade array Alloy steel plates, which is made using pressure vessel chrome molybdenum alloy steel as per the established quality standards. Available grades: ASTM A 387 GR. 11 CL. 1 / 2ASTM A 387 GR. 12 CL. 1 / 2ASTM A 387 GR. 22 CL. 1 / 2ASTM A 387 GR. 5 CL. 1 / 2DIN 17175 15Mo3 / 16Mo3