... , OD(max):1900mm 100% UT Inspection Material:Carbon Steel or Alloy Steel The ring forging parts are ... used for wind power generation high-speed gear case ,high-speed gear case,metallurgy, roll,oil extraction,mining, ... And it is made of many kinds of material, carbon steel, alloy steel, stainless steel and so on. ... material can be subject to ASTM - A388. Carbon Steel and Alloy Steel Forged Gear Ring