Austenite stainless steel and production method thereof

Abstract

The invention relates to austenite stainless steel and a production method thereof, and belongs to the technical field of stainless steel processing. The stainless steel product mainly comprises the following chemical components in percentage by weight: less than or equal to 0.03 percent of C, 0.4-0.6 percent of Si, 1.0-1.5 percent of Mn, 16.5-18.0 percent of Cr, 10.0-11.0 percent of Ni, 0.010-0.050 percent of N, 2.00-2.50 percent of Mo, less than or equal to 0.040 percent of P, less than or equal to 0.003 percent of S, 20-40ppm of B and the balance of Fe and inevitable impure elements, wherein the DG value is between 6 and 9, the value of Md30 is 30DEG C below zero- 60 DEG C below zero. The production process comprises the following steps: intensively deoxidizing and desulfurizing, adding Fe-B to refine the grain size of an as-cast billet, adding Ca-Si wires into a ladle furnace (LF) and prolonging the time of soft blowing and standing, controlling the superheat degree to be 20-40 DEG C and constant pulling speed of 1.1-1.15m / min; and weakening secondary cooling water, performing hot rolling, cold rolling and thermal treatment, and pickling. By adopting the method, the problem of surface defects occurring in the stainless steel processing process can be alleviated, and the cold rolling yield can be increased.

Description

technical field [0001] The invention relates to an austenitic stainless steel and a production method thereof, in particular to an austenitic stainless steel capable of improving the cold rolling yield and a production method thereof, belonging to the technical field of stainless steel processing. Background technique [0002] The requirement for the use of most stainless steel is to maintain the original appearance of the building for a long time. When determining the type of stainless steel to be selected, the main considerations are the required aesthetic standards, the corrosiveness of the local atmosphere, and the cleaning system to be adopted. In heavily polluted industrial areas and coastal areas, the surface will be very dirty and even rusted, but to obtain the aesthetic effect in the outdoor environment, it is necessary to use nickel-containing stainless steel. Austenitic stainless steel is a type of stainless steel that is widely used. Its output accounts for more...

AI Technical Summary

Problems solved by technology

When the casting slabs of the above steel types are produced by the continuous casting process, the surface of the continuous casting slabs is prone to dent defects and the growth of the slab shell is uneven. The shell of the primary slab sticks to slag. After the slab runs in the secondary cooling section, defects such as slag pits and pressure pits are formed. Defects such as longitudinal cracks also appear on the surface of the slab

Therefore, the first-class rate of 316L cold-rolled products produced in the factory was low, and surface defects have a great impact on the final performance of the products.

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