A kind of ultra-pure ferritic stainless steel with tin-copper synergistic effect and preparation method thereof

A synergistic, ultra-pure iron technology, applied in the field of stainless steel, can solve the problems of many types of added elements, difficult to guarantee the yield, and limited application range, etc., to achieve the effects of enhancing competitiveness, optimizing process production, and expanding the scope of use

Active Publication Date: 2020-04-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its ferritic stainless steel has excellent corrosion resistance and excellent removal of tempering color. It is mentioned that this steel is used for water storage tanks of electric water heaters, etc., but the patent is not concerned with the mechanical properties and processing of this steel. The nature of the steel has not been mentioned, which limits the scope of application of the steel. At the same time, due to the addition of Mo and V in the steel, and the high Cr content, the cost of the steel is high, and there are many types of added elements, and the yield in the smelting process is also low. Difficult to guarantee

Method used

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  • A kind of ultra-pure ferritic stainless steel with tin-copper synergistic effect and preparation method thereof
  • A kind of ultra-pure ferritic stainless steel with tin-copper synergistic effect and preparation method thereof
  • A kind of ultra-pure ferritic stainless steel with tin-copper synergistic effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of tin-copper ultra-pure ferritic stainless steel:

[0052] (1) Smelt and cast the slab according to the set composition, wherein the mass percentage of each component is Cu: 0.069%, Sn: 0.096%, Cr: 17.84%, C: 0.004%, Si: 0.25%, Mn: 0.32%, P: 0.0048%, S: 0.0048%, N: 0.0028%, and the rest are iron and unavoidable impurities.

[0053] (2) After cooling the slab to room temperature, reheat it to 1100°C, keep it warm for 2 hours, and use a 450mm hot rolling mill testing machine for rolling. The initial rolling temperature is 1100°C, and the final rolling temperature is 850°C. Single rolling The deformation is controlled at 25%, and the thickness of the final rolled plate after 7 passes of rolling is 3mm.

[0054] (3) The hot-rolled steel plate is subjected to the quenching + tempering heat treatment process, the quenching temperature is 1100 ° C, the holding time is 5 minutes, water cooling; the tempering temperature is 800 ° C, the holding time is 5 minutes, a...

Embodiment 2

[0056] Preparation of tin-copper ultra-pure ferritic stainless steel:

[0057] (1) Smelt and cast the slab according to the set composition, wherein the mass percentage of each component is Cu: 0.13%, Sn: 0.096%, Cr: 17.40%, C: 0.004%, Si: 0.29%, Mn: 0.32%, P: 0.0049%, S: 0.004%, N: 0.0025%, and the rest are iron and unavoidable impurities.

[0058] (2) After cooling the slab to room temperature, reheat it to 1110°C, keep it warm for 1.5h, and use a 450mm hot-rolling unit testing machine for rolling. The initial rolling temperature is 1050°C, and the final rolling temperature is 850°C. The rolling deformation is controlled at 25%, and the thickness of the finally rolled plate is 3 mm after 7 passes of rolling.

[0059] (3) The hot-rolled steel plate is subjected to quenching + tempering heat treatment process, the quenching temperature is 1095 ° C, the holding time is 8 minutes, water cooling; the tempering temperature is 795 ° C, the holding time is 10 minutes, and air cooli...

Embodiment 3

[0061] (1) Smelt and cast the slab according to the set composition, wherein the mass percentage of each component is Cu: 0.20%, Sn: 0.10%, Cr: 17.34%, C: 0.005%, Si: 0.25%, Mn: 0.31%, P: 0.0042%, S: 0.0045%, N: 0.002%, and the rest are iron and unavoidable impurities.

[0062] (2) After cooling the slab to room temperature, reheat it to 1090°C, keep it warm for 2 hours, and use a 450mm hot-rolling unit testing machine for rolling. The deformation of the rolling process is controlled at 20%, and the thickness of the final rolled plate after 7 passes of rolling is 3mm.

[0063] (3) The hot-rolled steel plate is subjected to quenching + tempering heat treatment process (quenching temperature 1110°C, holding time 5min, water cooling; tempering temperature 805°C, holding time 7min, air cooling) to obtain tin-copper alloyed ultra-pure iron Element stainless steel; tensile strength 493MPa, pitting potential 273.2mV, elongation after fracture 41.5%.

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Abstract

The invention relates to ultra-pure ferrite stainless steel containing synergistic tin and copper and a preparation method of the ultra-pure ferrite stainless steel. The ultra-pure ferrite stainless steel comprises the following components in percentage by mass: not greater than 0.005% of C, 0.2% to 0.4% of Si, 0.2% to 0.4% of Mn, smaller than or equal to 0.005% of P, smaller than or equal to 0.005% of S, 16% to 18% of Cr, smaller than or equal to 0.003% of N, 0.095% to 0.15% of Sn, 0.05% to 1% of Cu and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: (1) smelting according to set components and casting an ingot blank; (2) heating to the temperature of 1100+ / -10 DEG C, maintaining the temperature for 1-2 hours, and subsequently performinghot rolling to form a hot-rolled steel plate; and (3) performing thermal treatment, water cooling, heat maintaining and air cooling to obtain the ultra-pure ferrite stainless steel containing synergistic tin and copper. The method provided by the invention improves the mechanical properties and the corrosion resistance of the ferrite stainless steel on the basis of production cost reduction of theferrite stainless steel, the tensile strength of the ferrite stainless steel is as high as 450-560 MPa, the percentage elongation of the ferrite stainless steel is 30% t0 45%, and the pitting potential of the ferrite stainless steel is 200-285 mV.

Description

technical field [0001] The invention belongs to the technical field of stainless steel, and in particular relates to an ultra-pure ferritic stainless steel with synergistic effect of tin and copper and a preparation 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 stainless steel, it has better corrosion resistance, and compared with high-chromium stainless steel, it has excellent formability, so it is very suitable for household appliances, kitchen and bathroom products, etc., which have certain corrosion resistance and formability. required industry. In recent years, with the development of smelting technology, the content of C and N in ferritic stainless steel has been greatly reduced, and a series of ultra-pure ferritic stainless steel has been developed, which greatly overcomes the shortcomings and deficiencies of traditional ferri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/20C22C38/02C22C38/04C21D8/02
CPCC21D8/0205C21D8/0226C21D2211/005C22C38/004C22C38/008C22C38/02C22C38/04C22C38/20
Inventor 李阳姚聪林杜鹏飞姜周华徐光陈常勇
Owner NORTHEASTERN UNIV LIAONING
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