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Abnormally segregated stanniferous low-clearance ferritic stainless steel and preparation method thereof

A ferrite and stainless steel technology, applied in the field of metallurgy, can solve the problems that it is difficult to guarantee the mechanical properties and corrosion resistance of materials, and the yield rate is difficult to guarantee, so as to improve pitting corrosion resistance and intergranular corrosion resistance, save resources, The effect of improving competitiveness

Active Publication Date: 2014-06-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent application of Chinese Patent Publication No. CN101573466A (announcement date is November 4, 2009, and the name is ferritic stainless steel with excellent corrosion resistance and discoloration resistance) discloses a high-Cr ferritic stainless steel. Cu, Ti, Nb, etc. replace expensive Ni-containing austenitic stainless steel with high corrosion resistance ferritic stainless steel. The composition of this ferritic stainless steel is C: ≤0.01%, Si: 0.2~1.0%, Mn: ≤ 0.3%, Cr: 20~22%, Ni:, N: ≤0.01%, Al: 0.03~0.1%, Cu: 0.3~0.5%, Zr: 0.02~0.04%, Ti: 0.2~0.4%, Nb: 0.06 ~0.45%, the rest is Fe and unavoidable impurities. This invention reduces the addition of Ni in stainless steel and saves costs, but it still needs to add 0.2~0.4% Ni, and there are too many types of replacing elements, and the yield in the smelting process Yield is also difficult to guarantee
[0004] The Chinese patent application with publication number 102274937A (announcement date is December 14, 2011, titled a preparation method of tin-containing ferritic stainless steel strip with reverse segregation tin) discloses a tin-containing ferritic stainless steel strip with reverse segregation tin The preparation method of the ferritic stainless steel thin strip is carried out as follows: using ferritic stainless steel with a tin content of 0.1-0.8 weight percent as raw material, first smelt molten steel in an intermediate frequency induction furnace under a high vacuum environment, and then use a double-roller Thin strip casting and rolling equipment casts and rolls tin-containing ferritic stainless steel strip blanks with a thickness of 1.0~3.2mm inverse segregation tin. The gap is 0.0~2.2mm. After subsequent rolling and annealing treatment, the ferritic stainless steel strip with reverse segregated tin is finally obtained. It is difficult to ensure that the smelted steel can meet the required mechanical properties and corrosion resistance of the material.

Method used

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  • Abnormally segregated stanniferous low-clearance ferritic stainless steel and preparation method thereof
  • Abnormally segregated stanniferous low-clearance ferritic stainless steel and preparation method thereof
  • Abnormally segregated stanniferous low-clearance ferritic stainless steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Smelt and cast the slab according to the set composition, the composition contains C 0.005%, Si 0.4%, Mn 0.2%, P 0.016%, S 0.018%, Cr 14%, N 0.005%, Sn 0.24%, Nb 0.05% by weight %, the rest is iron and unavoidable impurities; the Sn used in smelting comes from tin-plated scrap steel;

[0057] After cooling the slab to room temperature, heat it to 1150 ± 10°C, keep it warm for 1h, and then carry out 5 passes of hot rolling. The starting temperature is 1080°C, the final rolling temperature is 800°C, and the rolling deformation is 30%. into hot rolled steel plate;

[0058] Anneal the hot-rolled steel sheet at 900±10°C for 2 hours, cool to room temperature, pickle to remove the surface oxide layer, and then carry out cold rolling with a total reduction rate of 75% to make cold-rolled steel sheet;

[0059] The cold-rolled steel plate was heated to 800±10°C, held for 10 minutes and then normalized to obtain abnormally segregated tin-containing low-gap ferritic stainless stee...

Embodiment 2

[0063] Smelting and casting slabs according to the set composition, the composition contains C 0.01%, Si 0.35%, Mn 0.25%, P 0.017%, S 0.014%, Cr 14.5%, N 0.007%, Sn 0.31%, Ti 0.05% by weight %, the rest is iron and unavoidable impurities; the Sn used in smelting comes from tin-plated scrap steel;

[0064] After cooling the slab to room temperature, heat it to 1150 ± 10°C, keep it warm for 2h, and then conduct 6 passes of hot rolling, the starting temperature is 1100°C, the final rolling temperature is 850°C, and the rolling deformation is 20%. into hot rolled steel plate;

[0065] Anneal the hot-rolled steel sheet at 900±10°C for 2.5 hours, cool to room temperature, then pickle to remove the oxide layer on the surface, and then carry out cold rolling. The total reduction rate of cold rolling is 88%, and the cold-rolled steel sheet is made;

[0066] The cold-rolled steel plate was heated to 800±10°C, held for 20 minutes for normalizing treatment, and an abnormally segregated t...

Embodiment 3

[0068] Smelting and casting slabs according to the set composition, the composition contains C 0.015%, Si 0.33%, Mn 0.28%, P 0.019%, S 0.015%, Cr 14.8%, N 0.009%, Sn 0.19%, V 0.05% by weight %, the rest is iron and unavoidable impurities; the Sn used in smelting comes from tin-plated scrap steel;

[0069] After cooling the slab to room temperature, heat it to 1150 ± 10°C, keep it warm for 3 hours, and then conduct 5 passes of hot rolling, the starting temperature is 1090°C, the final rolling temperature is 830°C, and the rolling deformation is 25%. into hot rolled steel plate;

[0070] Anneal the hot-rolled steel sheet at 900±10°C for 3 hours, cool to room temperature, pickle to remove the surface oxide layer, and then carry out cold rolling with a total reduction rate of 85% to make cold-rolled steel sheet;

[0071] The cold-rolled steel plate was heated to 800±10°C, held for 30 minutes, and then normalized to obtain abnormally segregated tin-containing low-interstitial ferr...

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Abstract

The invention discloses abnormally segregated stanniferous low-clearance ferritic stainless steel and a preparation method thereof, and belongs to the technical field of metallurgy. The stainless steel comprises the following components in percentage by weight: 0.005-0.03% of C, 0.2-0.4% of Si, 0.2-0.5% of Mn, less than or equal to 0.03% of P, less than or equal to 0.02% of S, 14-16% of Cr, less than or equal to 0.01% of N, 0.1-0.4% of Sn, Nb, Ti and / or V and the balance of iron and inevitable impurities; the tensile strength is 445-451MPa; the pitting potential is 202-240mV. The preparation method comprises the following steps: (1) smelting and casting a blank according to set components; (2) heating to be 1150+ / -10 DEG C, carrying out heat preservation for 1-3 hours, and subsequently hot-rolling to make a hot-rolled steel plate; (3) annealing at 900+ / -10 DEG C for 2-3 hours, cooling to room temperature, pickling and then cold-rolling to make a cold-rolled steel plate; (4) heating to 800+ / -10 DEG C and carrying out normalizing treatment to obtain the abnormally segregated stanniferous low-clearance ferritic stainless steel. By adopting the method disclosed by the invention, the production cost of the stainless steel can be greatly lowered, the process is simple, and a product is high in strength, hardness and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to an abnormally segregated tin-containing low-gap ferritic stainless steel and a preparation method thereof. Background technique [0002] The main alloy components of stainless steel are nickel, chromium, etc., among which nickel is a relatively expensive metal. LME-Ni basically fluctuates above hundreds of thousands, and the high level reaches more than 400,000 per ton. my country is a country that lacks nickel, molybdenum, chromium and stainless steel scrap resources. With the rapid increase in stainless steel production, the supply of raw materials has become a prominent problem; in order to reduce business risks and reduce the impact of raw material price fluctuations on the stainless steel market, stainless steel Manufacturers and downstream users are turning to chromium-based and chromium-molybdenum-based stainless steels that contain no or little nickel. With the further...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C38/28C22C38/24C21D8/02
Inventor 韩纪鹏李阳方勇姜周华杨永超汪秀秀
Owner NORTHEASTERN UNIV
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