Manufacture method for seamless steel tube

Abstract

The invention discloses a manufacture method for a seamless steel tube. The method is used for manufacture of austenite type free-cutting wear resistant stainless steel. The method comprises the following steps: 1) carrying a primary pickling for a blank material; 2) carrying out grinding, rolling-drawing combination, oil removing for the pickled blank material; 3) determining whether the resulting material meets the requirements of the finished product, wherein the resulting material is subjected to an intermediate product solid solution heat treatment, straightening and pickling, and the step 2) is repeatedly performed if the resulting material does not meet the requirements of the finished product; 4) carrying out a finished product solid solution heat treatment, straightening and fixed finished product cutting if the resulting material meets the requirements of the finished product; 5) carrying out pickling for the finished product. The temperature of the intermediate product solution heat treatment and the temperature of the finished product solid solution heat treatment are 1010-1150 DEG C, and a rapid cooling treatment is performed after the intermediate product solution heat treatment or the finished product solid solution heat treatment is performed, wherein the temperature of the intermediate product solution heat treatment is 1040-1150 DEG C, and the temperature of the finished product solid solution heat treatment is 1020-1100 DEG C. According to the present invention, the seamless steel tube manufacture method with characteristics of energy saving and simple process is provided; the technical problems in the prior art are solved; the yield and the whole product quality are improved, and especially the surface quality is improved, wherein the tensile strength Rm is more than or equal to 540 Mpa, the stipulated non-proportional extension strength Rp0.2 is more than or equal to 240 Mpa, the elongation at break A is more than or equal to 40%, and the rockwell hardness HRB is less than or equal to 90; the smooth surface can be achieve after pickling so as to provide the organization preparation for the next process, wherein the surface roughness Ra is less than or equal to 1.00 mum.

Description

technical field [0001] The invention relates to a method for manufacturing a seamless steel pipe, in particular to a method for manufacturing an austenitic free-cutting stainless acid-resistant steel. 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 seamless steel pipe...

AI Technical Summary

Problems solved by technology

However, under the existing technology, austenitic stainless steel generally does not have good cutting performance and high temperature bonding performance

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