Low-chromium ferritic stainless steel and manufacturing method thereof

Abstract

The invention relates to low-chromium ferritic stainless steel and a manufacturing method thereof. The low-chromium ferritic stainless steel comprises the following components in percentage by mass: 0.005 to 0.015 percent of C, 0.005 to 0.015 percent of N, 0.50 to 1.20 percent of Si, less than or equal to 1.00 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.010 percent of S, 10 to 15 percent of Cr, 0.05 to 0.20 percent of V, less than or equal to 0.10 percent of Ti, less than or equal to 0.005 percent of Al, less than or equal to 0.005 percent of O and the balance of Fe and inevitable impurities. The low-chromium ferritic stainless steel has higher yield strength and tensile strength and has certain plasticity and excellent corrosion resistance. Therefore,the low-chromium ferritic stainless steel can be used in the industries for manufacturing frames of televisions, computers, mobile phones and other electronic products, and the like.

Description

technical field [0001] The invention belongs to the field of stainless steel manufacturing, and relates to a high-strength low-chromium ferritic stainless steel and a manufacturing method thereof. Background technique [0002] Ferritic stainless steel does not contain nickel or contains only a small amount of nickel and is a nickel-saving stainless steel. In addition to its stainless and general corrosion resistance, it has excellent local corrosion resistance such as chloride stress corrosion resistance, pitting corrosion resistance, and crevice corrosion resistance. In addition, ferritic stainless steel has high strength, low tendency of cold work hardening, thermal conductivity is 130%-150% of austenitic stainless steel, and linear expansion coefficient is only 60%-70% of Cr-Ni austenitic stainless steel. Good overall performance. Therefore, it has a wide range of applications and broad development prospects in the fields of home appliance industry, automobile industry,...

AI Technical Summary

Problems solved by technology

Such as CN1363710 discloses a kind of ferritic stainless steel plate with good workability and its manufacture method, its steel type contains C and N of higher content, although the strength of steel has been improved, but also the toughness and weldability of steel have been improved simultaneously decline

Another example is CN1507500, which discloses a ferritic stainless steel plate with good shape solidification and its manufacturing method, wherein, in order to improve the shape solidification of the steel plate, Mo and Cu are added to the steel, and the C content is strictly limited , making the manufacturing cost too high

In addition, the steel grade disclosed in JP2001003143 restricts the N content to improve the workability and surface, but its Si content control is low, which reduces the strength of the steel. performance drop

[0005] It can be seen that the ferritic stainless steel in the prior art cannot fully meet the current use and manufacturing requirements, and it is necessary to develop a ferritic stainless steel with high strength, good welding performance and low cost

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