Method for manufacturing seamless steel tubes

Abstract

The invention discloses a method for manufacturing seamless steel tubes, which is used for manufacturing seamless steel tubes made of low nickel heat-resisting austenitic stainless steel. The method comprising the following steps: 1) carrying out first pickling on blanks; 2) carrying out polishing, combined drawing and rolling and oil removal on the blanks undergoing pickling; 3) judging whether the finished product requirements are satisfied, if not, carrying out solution heat treatment, straightening and pickling on the intermediate products and repeating the step 2; 4) if so, carrying out solution heat treatment, straightening and fixed cutting on the finished products; and 5) pickling the finished products. The temperature is controlled between 1065 DEG C and 1085 DEG C when carrying out solution heat treatment on the intermediate products and between 1005 DEG C and 1025 DEG C when carrying out solution heat treatment on the finished products. The method solves the problems in theprior art, saves energy and has simple processes.

Description

technical field [0001] The invention relates to a manufacturing method of a seamless steel pipe, in particular to a manufacturing method of a nickel-saving heat-resistant austenitic stainless steel seamless steel pipe. Background technique [0002] Seamless steel pipe is a long strip of steel with a hollow section and no seams around it. Because of its hollow cross-section, seamless steel pipes are widely used as pipes for conveying fluids, such as pipes for conveying oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when the bending and torsional strength is the same. Shafts, bicycle frames, and steel scaffolding used in construction, etc., making ring parts with seamless steel pipes can improve material utilization, simplify manufacturing processes, save materials and processing hours, such as rolling bearing rings, jack sets, etc., have been widely used at present. Made of s...

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Problems solved by technology

However, under the existing technology, on the one hand, the precious metal content of nickel in the austenitic stainless steel seamless steel pipe is relatively high, so the price of the austenitic stainless steel seamless steel pipe is relatively expensive; on the other hand, when the seamless steel pipe is used in the fields of metallurgy and petrochemical , often require better strength, heat resistance and oxidation resistance, which make the traditional austenitic stainless steel seamless steel pipe unable to meet the requirements, because nickel-saving heat-resistant austenitic stainless steel is cheap, high strength, good heat resistance and good oxidation resistance, so it is urgent to use nickel-saving heat-resistant austenitic stainless steel instead of traditional austenitic stainless steel to make seamless steel pipes, but the traditional method of making seamless steel pipes makes nickel-saving heat-resistant austenitic stainless steel seamless Steel pipes not only waste energy, but also complicate the process

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