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Two-phase region heat treatment process for ferritic stainless steel hot rolled strip

A technology of hot-rolled strip steel and ferrite, which is applied in the field of stainless steel heat treatment, can solve the problems of no obvious improvement in stamping formability and wrinkle resistance, and achieve the suppression of the formation of cluster-like aggregation structures, developed texture, and improved plastic effect

Active Publication Date: 2019-03-29
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

Many researchers have studied the influence of annealing temperature and holding time of bell furnace on the formability and wrinkle resistance of 430 ferritic stainless steel. There are still obvious band structures in the rolled strip steel, and there is no obvious improvement on the stamping formability and wrinkle resistance

Method used

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  • Two-phase region heat treatment process for ferritic stainless steel hot rolled strip
  • Two-phase region heat treatment process for ferritic stainless steel hot rolled strip
  • Two-phase region heat treatment process for ferritic stainless steel hot rolled strip

Examples

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Embodiment

[0023] Example: Put the above-mentioned hot-rolled coils into a high-temperature box furnace to raise the temperature to 980°C, keep warm for 3 hours, then cool to 850°C with the furnace, keep warm for 5 hours, and recirculate once according to this cycle, then cool with the furnace to below 250°C and leave the furnace Air cooling, process such as figure 2 shown.

[0024] The mechanical properties of 430 ferritic stainless steel hot-rolled strip treated by two methods are shown in Table 1.

[0025] Table 1 Mechanical properties of 430 ferritic stainless steel hot-rolled strip after treatment

[0026]

[0027] 430 ferritic stainless steel hot-rolled strip has the following mechanical properties after annealing: Rp 0.2 ≥205MPa, Rm≥420MPa, A≥22%, HV value≤200. It can be seen from Table 1 that the embodiment has lower strength, hardness and higher elongation, which is beneficial to the forming process of the plate and strip. The typical metallographic structure of comparat...

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Abstract

The invention discloses a two-phase region heat treatment process for a ferritic stainless steel hot rolled strip. According to two-phase region heat treatment process for the ferritic stainless steelhot rolled strip, the ferritic stainless steel hot rolled strip is subjected to multiplex heat treatment in a temperature interval of a ferrite and austenite two-phase region, then a cold-rolling annealing process same as a conventional process for annealing a hot rolled strip by a bell-type furnace is adopted, cold rolling is performed to achieve a same thickness, and annealing and heat preservation are performed to obtain a sufficient recrystallized structure. Through the reversible phase change and recrystallization in the two-phase region heat treatment process, a strip-shaped structure in the original hot rolled strip can be effectively segmented and crushed, the plasticity of the hot rolled strip is improved, good raw material conditions are created for subsequent cold rolling and continuous annealing, and the formability and crease resistance of a final cold rolled strip are improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel heat treatment, and in particular relates to a dual-phase zone heat treatment process for ferritic stainless steel hot-rolled strip steel. Background technique [0002] Ferritic stainless steel is a type of stainless steel with a body-centered cubic crystal structure, a carbon content of ≤0.20%, a chromium content of 10.5% to 32.0%, and a ferrite structure at room temperature. 430 (10Cr17) ​​is the most widely used type of ferritic stainless steel, and has partially replaced austenitic stainless steel in kitchen utensils, household appliances, automobile exhaust systems and other fields. In these fields, 430 ferritic stainless steel is mostly used as deep drawing parts, which require excellent formability. However, at present, the formability of corresponding domestic steel types is generally low, far from the level of austenitic stainless steel, and surface wrinkling defects are prone to...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/26
CPCC21D1/26C21D8/0205C21D8/0247C21D2211/005
Inventor 李聚宝刘天增纪显彬徐斌喻大刚
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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