Control method for sigma-phase precipitation of ER316L austenitic stainless steel wire rods

Abstract

The invention belongs to the field of metal material production and manufacture, and specifically discloses a control method for sigma-phase precipitation of ER316L austenitic stainless steel wire rods. According to the method, sigma-phase precipitation proportions of ER316L austenitic stainless steel wire rods are controlled through the cooperation of rolling temperature and strain rate in the process of producing and rolling wire rods, the rolling temperature is higher than 1000 DEG C, and the strain rate is lower than 40 s-1. A solid solution heat treatment method and a high-temperature compression experiment in the field of metal heat processing are adopted, so that the laws of influences, on second-phase precipitation behaviors, of ER316L austenitic stainless steel, of solid solutiontemperature and strain rate are discovered and grasped, optimum rolling temperature and spinning temperature are determined, and reasonable rough / intermediate rolling speed and pass deformation are determined at the same time, thereby optimizing the rolling process and carrying out high-speed rolling. According to the method, the surfaces and internal parts of the produced wire rods do not defects, the tissues focus on austenite grains, the sigma-phase content is smaller than 3% and is distributed in a dispersion manner, the tensile strength mean value is 640.2 MPa, the elongation mean value is 48.7%, and relatively good drawing performance is embodied.

Description

technical field [0001] The invention belongs to the field of production and manufacture of metal materials, and in particular relates to a control method for σ-phase precipitation of ER316L austenitic stainless steel wire rods. Background technique [0002] ER316L austenitic stainless steel wire rod is a high-quality ultra-low carbon welding material. The deposited metal has good low-temperature performance, pitting corrosion resistance, intergranular corrosion and stress corrosion resistance, so the welding wire made of this material is widely used in Petrochemical, nuclear power, cryogenic vessels and other fields. However, the rolling of this kind of wire rod is very different from that of ordinary carbon steel. It has the characteristics of high deformation resistance, thermal inhomogeneity, and large expansion coefficient under thermoplastic deformation. It often appears in high-wire rolling. Cracks on the surface or inside seriously affect the quality of the product. ...

AI Technical Summary

Problems solved by technology

But this will cause damage to the material properties. The reduction of the content of chromium equivalent elements will reduce the effect of pitting corrosion resistance and crevice corrosion resistance, while the increase of nickel equivalent elements will reduce the solubility of carbon in austenitic stainless steel, resulting in the precipitation of carbides. Tendency to increase, which is detrimental to the subsequent cold working properties of wire rod products

[0004] At present, there have been reports of special steel production lines successfully rolling austenitic stainless steel wire rods, but there are still problems such as low rolling speed, billet corner cracks, and poor surface quality. The reason is that the rolling parameters (including rolling temperature, rolling Form a deep understanding of the influence of σ phase precipitation and wire rod performance

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