... :0.030max, Si:1.00max,Cr:16.00-18.00, Ni:10.00-14.00, Mo: 2.00-3.00 2. Size: OD: 4MM-426MM Thickness: 1MM-20MM ... A511, A376, A789, 6. Application: It is Widely used for the pipings for fluid transfer, such as petrol, natural gas, water, coal ... machinery and construction structural components. Usually, it is also used for manufacturing various kinds of conventional weapons, Gun-barrels, Cannonballs, etc ...