Piston rod forged by many kinds of steel. Lengh(max): 10-12m 100% UT Test High Quality Customized The forged piston rods are used for wind power generator, gear case,metallurgy, rolling mill,oil extraction,mining,chemical industry, hydraulic pressure products, port and shipping driving machines and so on. And it is made of many kinds of materials like carbon steel, alloy steel, stainless steel ...