1, high strengh structural steel 2, high hardness and toughness 3, high hardenability 4, ... machining Sichuan Liaofu Special Steel Trading Co., Ltd.alloy structural steelGB 30CrMnSi Dimensions: thickness:10mm~90mm; width: 60mm~610mm; length: 4~6m ... important parts like gear, axle, clutch, chain wheel, axle sleeve, bolt, and nut, etc.; parts of high abrasive resistance and low ...