Method for producing transformation induced plasticity (TRIP) seamless tube

Abstract

The invention belongs to the field of preparation of steel tubes, and in particular relates to a method for producing a transformation induced plasticity (TRIP) seamless tube. The method comprises the following steps that: a smelted ingot is forged into a rod, turned, heated, punched and subjected to cold drawing to obtain a seamless cold drawing steel tube, and the seamless cold drawing steel tube is placed in a resistor furnace for critical region isothermal annealing for 180-1200 seconds at the temperature of 780-850 DEG C, and then is rapidly placed in a salt bath furnace for bainite region isothermal annealing for 120-1800 seconds at the temperature of 380-470 DEG C so as to obtain the TRIP seamless tube. According to the technical scheme in the invention, the chemical components of common low carbon steel can be used for producing the TRIP seamless tube with good comprehensive mechanical properties, high yield strength up to 580MPa, high tensile strength up to 763MPa and high product of strength and elongation up to 22029MPa.%. The method is easy to realize in industrialized production, has the advantages of relatively stable process and relatively low cost, and is suitable for producing TRIP seamless steel tubes with different chemical components and sizes.

Description

technical field [0001] The invention belongs to the field of steel pipe preparation, and in particular relates to a production method of a plastic steel seamless pipe induced by phase transformation. Background technique [0002] In order to meet the needs of environmental protection, automobile lightweight has become an important topic that has been extensively studied. Among them, steel materials, which are the main materials used in automobiles, need to minimize the thickness of the components under the premise of ensuring high strength and formability. Therefore Some scholars have developed phase-change-induced plasticity steel and applied it in actual production. At present, the technology of phase-change-induced plasticity steel plate used in automobile lightweight production has become increasingly mature, but if further lightweight production is to be carried out, it is necessary to use The method of replacing solid parts with hollow parts is realized. With the matur...

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Problems solved by technology

At present, ordinary seamless steel pipes are mainly produced by piercing and rolling. The rolled seamless steel pipes are directly air-cooled to room temperature, and their structures are mainly ferrite + pearlite. In contradiction with plasticity, the application in the field of internal high pressure forming has been limited

[0004] At present, in the production of seamless steel pipes, the heat treatment is mostly the traditional process of quenching and tempering. The advantage of this process is that the application is relatively mature, but the resulting products do not have good formability when they reach the required strength of auto parts, so in In the process of internal high pressure forming, the processing is more difficult and the yield is low

At present, the relatively mature materials used in the field of internal high-pressure processing are still mainly low-strength steel pipes, titanium pipes, aluminum pipes and magnesium pipes. Many scholars have used these materials to prepare T-shaped three-way pipes, Y-shaped three-way pipes, square pipes, Bellows and other parts with complex cross-sectional shapes, but the disadvantage is that the strength of these materials is generally not high

Later, some scholars began to use stainless steel as the material for internal high-pressure processing to conduct experiments, and obtained good results. However, the cost of stainless steel is relatively high, and it still cannot fully meet the production requirements.

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