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Sn-containing ferrite stainless steel with low cost and high corrosion resistance, and manufacturing method thereof

A manufacturing method and high corrosion resistance technology, applied in the field of ferritic stainless steel and its manufacturing, can solve the problems of not meeting the low-cost design requirements, not meeting the ferritic stainless steel, and not having relevant research on corrosion resistance, and achieving improvement Effect of surface quality, alloy cost reduction, and SOX corrosion resistance improvement

Inactive Publication Date: 2017-02-22
BAOSTEEL DESHENG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Chinese patent CN103510013A adds 0.01-0.8% Sn to 13-21Crwt% ferritic stainless steel, which mainly improves the wrinkle resistance of the material, but there is no relevant research on corrosion resistance
This invention mainly studies the effect of Sn content on improving pitting performance, does not contain reducing sulfuric acid resistance, and at the same time the steel type has a high Al content, which does not meet the ferritic stainless steel that is the object of the present invention
[0012] Chinese patent CN102277538A adds 0.01-2wt% Sn to 11-30% Cr ferritic stainless steel to improve the corrosion resistance of the material, and at the same time requires the addition of RE or Ga, which increases the cost of the alloy and does not meet the low-cost design requirements of the present invention

Method used

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  • Sn-containing ferrite stainless steel with low cost and high corrosion resistance, and manufacturing method thereof
  • Sn-containing ferrite stainless steel with low cost and high corrosion resistance, and manufacturing method thereof

Examples

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Embodiment 1

[0046] Examples 1-3 are 13.5-15wt% Cr stainless steel containing Sn, and Comparative Example 1 does not carry out Sn microalloying 14Crwt%. It can be seen from the comparison that Sn microalloying has obvious improvement on corrosion resistance, and the corrosion rate From 15.18g / m in comparative example 1 2 Reduced to 10.65g / m in Example 1 2 , the corrosion rate is reduced by about 40%; the maximum corrosion pit depth is reduced from 172 μm in Comparative Example 1 to about 124 μm in Example 1, and the corrosion pit depth is reduced by about 38%, while the mechanical properties remain basically unchanged.

[0047] Examples 1-3 are 13.5-15wt% Cr stainless steel containing Sn, and comparative examples 2 and 3 are 17wt% Cr stainless steel without Sn microalloying. It can be seen from the comparison that the 13.5-15wt% Cr stainless steel containing Sn is corrosion-resistant The properties are close to or reach 17wt% Cr ferritic stainless steel, where the corrosion rate is from 1...

Embodiment 3

[0049] Embodiment 3 is the stainless steel of low Ti, is the stainless steel contrast of high Ti with embodiment 4; Embodiment 8 is the stainless steel of low Ti, is the stainless steel contrast of high Ti with embodiment 9; Embodiment 3,4 corrosion resistance is quite, The corrosion resistance of Examples 8 and 9 is equivalent, wherein the single-side grinding amount of continuous casting slabs in Examples 3 and 8 is about 2 mm, while the single-side grinding amount of continuous casting slabs in Examples 4 and 9 is about 3 mm; Compared with ratios 2 and 3, the corrosion resistance is equivalent. Among them, embodiment 3 is a Sn-containing stainless steel, which reduces the content of Ti, and the single-side grinding amount of the continuous casting slab is about 2mm. The amount of grinding is about 4mm, which can reduce the amount of grinding on the surface of the continuous casting slab during the manufacturing process.

[0050]

[0051]

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Abstract

The invention relates to a Sn-containing ferrite stainless steel with low cost and high corrosion resistance, and a manufacturing method thereof. The Sn-containing ferrite stainless steel comprises, by weight, 0.015% or less of C, 0.020-0.70% of Si, 0.02-0.6% of Mn, 13-18% of Cr, 0.10-0.30% of Ti, 0 (exclusive) - 0.20% (inclusive) of Nb, 0-1.0% of Mo, 0.035% or less of P, 0.010% or less of S, 0.015% or less of N, 0.025% or less of (C+N), 0 (exclusive) - 0.008% (inclusive) of Al, 0.03-0.20% of Sn, and the balance of Fe and inevitable impurities, wherein the weight percentage of (Nb + Ti + Sn) is not less than a value 10 times the weight percentage of (C + N), and the weight percentage of (Nb + Ti) is not less than a value 8 times the weight percentage of (C + N). Sn micro-alloying improves the reducing sulfuric acid corrosion resistance and improves the condensate liquid corrosion resistance of 13-15 wt% Cr ferrite stainless steel in an exhaust system to be same to or to approach the corrosion resistance of 17 wt% Cr ferrite stainless steel; and compared with the 17 wt% Cr ferrite stainless steel, the Sn-containing ferrite stainless steel has the advantages of meeting of the condensate liquid corrosion resistance of present exhaust systems, reduction of the content of Ti in components, improvement of the stainless steel surface quality, and reduction of the alloy cost and the manufacturing cost.

Description

technical field [0001] The invention relates to ferritic stainless steel and a manufacturing method thereof, in particular to a low-cost, high-corrosion-resistant Sn-containing ferritic stainless steel and a manufacturing method thereof. Background technique [0002] With the development of China's auto industry, China has been the world's largest automaker for five consecutive years. The pollution of automobile exhaust has become the main source of smog pollution. For this reason, the increasingly stringent environmental protection requirements and the need to continuously reduce the weight of the vehicle body and the cost of materials have made the materials for automobile exhaust systems more and more valued by automobile manufacturers. . Ferritic stainless steel has the advantages of comprehensive cost and performance such as nickel saving, excellent corrosion resistance, low thermal expansion coefficient, high strength and other physical and mechanical properties, maki...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/28C22C38/22C22C38/26C22C33/06
CPCC22C33/06C22C38/008C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28
Inventor 刘春粟毕洪运张志霞常锷
Owner BAOSTEEL DESHENG STAINLESS STEEL
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