Material: Carbon steel & alloy steel. OD(max):800mm, length(max): 2000mm 100% UT TEST The cylinder forgings are used for chemical industry, hydraulic pressure products, port and shipping driving machines and so on. And it made by many kinds of material, carbon steel, alloy steel, stainless steel and so on. And the US TEST of all material can be subject to SEP1921 E/e. Carbon Steel or Alloy Steel ...