SPIRAL PIPE STEEL STRIP PROCESSING REQUIREMENTS

Steel pipe and round steel compared to the solid steel such as bulk quantity used for conveying fluid pipe. The bending torsional strength phase at the same time, the weight is lighter, a kind of economic cross section steel, widely used in building structures and mechanical parts, such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel scaffolding is used. Constructed circular steel tube parts, can be forward material holding rate, simplifying the construction process, waste materials and processing hours, such as rolling bearing ring, jack sets, etc., are now widely used steel pipemanufacturing. Steel pipe and all kinds of firearms is the old practice or precedent embarrassment cu materials, gun, gun barrel to steel pipe manufacturing.

Reduce the carbon content. Also can decrease the sulfide inclusion goons, spiral tube the specific request of steel strip can be perhaps or effective forward steel weldability; To reduce the sulfur content of steel to improve the toughness of steel tube is good note and crack arrest. Forward of the crack resistance of steel, reduce the sulfur content also can improve the details of the steel strip character. Phosphorus for steel strip is harmful to both toughness and weldability contrast with other rare elements in steel, phosphorus sulkily forward charpy attack transition temperature has also have a strong effect on the hardenability, reduce the phosphorus content can be directly forward of solderability, because some of the lower phosphorus content in the hot rolled steel belt, the better. And the appropriate increase the content of titanium, vanadium, niobium. Control of the chemical composition of hot rolled steel belt is important to reduce the content of carbon and sulfur phosphorus.

Steel pipe according to the cross-sectional area in the shape of a can be divided into circular tube and special pipe. Because of the rather under the condition of the circumference, the circle area is the largest, with a round tube can be transported or perhaps more fluid. The other circle cross section under radial pressure, the internal or external stress is relatively uniform, in order to, the vast majority of steel tube is round tube. If in the plane bending condition, but the pipe also has the certain scale. Circular tube is not square, rectangular tube bending strength is big, some agricultural machinery and skeleton, gangmu furniture commonly used square, rectangular tube. According to not use should also have other cross section shape of profiled steel pipe.