High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof

A high-hardness, high-strength technology, used in temperature control and other directions, can solve problems such as increasing costs

Active Publication Date: 2012-08-29
BAOSTEEL DESHENG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention controls the effect of precipitation strengthening of the second phase in the steel by controlling the element content to meet a certain formula, and improves the performance of the steel by controlling the grain size, but it should be pointed out that in actual production, the content of the element must be accurate It is not an easy task to satisfy a certain formula. In addition, the invention contains precious metals such as Cu and Ni, which undoubtedly increases the cost of the invention.

Method used

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  • High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof
  • High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof
  • High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Carry out electric furnace+AOD two-step method smelting according to the composition of embodiment 1 in table 3, and according to figure 1 The process route and the process parameters in Table 2 are obtained after casting→hot rolling→BAF bell furnace annealing→pickling→cold rolling→APC cold annealing and pickling. Among them, the finishing temperature of hot rolling is controlled at 800°C, and the hot rolling annealing is as follows: figure 1 As shown by the solid line in the middle, the annealing temperature is controlled at 820°C, the time is controlled at 16 hours, and the cooling method is slow cooling in the furnace; while the cold rolling annealing is as follows figure 1 As shown by the dotted line in the middle, the annealing temperature is controlled at 850°C, the time is 1 minute, and the annealing method adopts water mist rapid cooling. Its performance is shown in Table 4.

Embodiment 2

[0035] Carry out electric furnace+AOD two-step method smelting according to the composition of embodiment 2 in table 3, and according to figure 1 The process route and the process parameters in Table 2 are obtained after casting→hot rolling→BAF bell furnace annealing→pickling→cold rolling→APC cold annealing and pickling. Among them, the finishing temperature of hot rolling is controlled at 850°C, and the hot rolling annealing is as follows: figure 1 As shown by the solid line in the middle, the annealing temperature is controlled at 900°C, the time is controlled at 18 hours, and the cooling method is slow cooling in the furnace; while the cold rolling annealing is as follows figure 1 As shown by the dotted line in the middle, the annealing temperature is controlled at 850°C for 2 minutes, and the annealing method adopts water mist rapid cooling. The properties are shown in Table 4.

[0036] table 3

[0037]

Embodiment 3

[0039] Carry out electric furnace+AOD two-step method smelting according to the composition of embodiment 3 in table 3, and according to figure 1 The process route and the process parameters in Table 2 are obtained after casting→hot rolling→BAF bell furnace annealing→pickling→cold rolling→APC cold annealing and pickling. Among them, the finishing temperature of hot rolling is controlled at 900°C, and the hot rolling annealing is as follows: figure 1 As shown by the solid line in the middle, the annealing temperature is controlled at 800°C, the time is controlled at 20 hours, and the cooling method is slow cooling in the furnace; while the cold rolling annealing is as follows figure 1 As shown by the dotted line in the middle, the annealing temperature is controlled at 900°C, the time is 1 minute, and the annealing method adopts water mist rapid cooling. Its performance is shown in Table 4.

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Abstract

The invention relates to high-strength and high-hardness medium-chromium ferritic stainless steel, which comprises the following chemical components in weight percentage: 0.02-0.10 percent of C, 0.30-0.80 percent of Si, 0.40-1.0 percent of Mn, 16.0-20.0 percent of Cr, 0.02-0.08 percent of N, 0-0.3 percent of Ti, 0.08-0.4 percent of V, 0-0.3 percent of Nb and the balance Fe and unavoidable impurities, wherein V percent is not less than 4*N percent. A manufacturing method for the ferritic stainless steel comprises the following steps of: electric furnace and argon oxygen decarburization two-step smelting, casting, hot rolling, cover annealing, acid washing, cold rolling and cold-annealing acid washing, wherein the finish rolling temperature of the hot rolling is controlled to between 800 DEG C and 950 DEG C; the annealing temperature of the hot rolling is controlled to between 800 DEG C and 900 DEG C; the annealing time is 16-24 hours; an in-furnace slow cooling mode is adopted to serve as a cooling mode; the annealing temperature of the cold rolling is controlled to between 900 DEG C and 1000 DEG C, the annealing time is 1-2 minutes, and a spray rapid cooling mode is adopted to serve as the cooling mode. The tensile strength of the obtained steel is 450-600MPa, the yield strength is 250-350MPa, the Vickers hardness is 145-170, and the coefficient of elongation is 30-40 percent.

Description

technical field [0001] The invention relates to ferritic stainless steel, in particular to high-strength and high-hardness medium-chromium ferritic stainless steel and a manufacturing method thereof. Background technique [0002] Medium chromium ferritic stainless steel occupies a very important position in the ferritic stainless steel family. Compared with low-chromium ferritic stainless steel, it has better corrosion resistance, and compared with high-chromium ferritic stainless steel, it has excellent formability, so it is very suitable for corrosion resistance of household appliances, kitchen and bathroom products, etc. and formability have certain requirements of the industry. Taking the typical medium chromium ferritic stainless steel SUS430 as an example, it has been widely used in household appliances and other industries. Bowl machines, ovens, stoves, disinfection cupboards and other kitchen and bathroom equipment, tableware, hardware products, etc., as well as va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28B21B37/74C21D1/26
Inventor 张鑫孙全社
Owner BAOSTEEL DESHENG STAINLESS STEEL
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