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A hot-rolled low-yield ratio high-strength acid corrosion-resistant steel plate and its production method

A technology with acid corrosion resistance and low yield strength ratio, applied in the direction of improving process efficiency, can solve the problems of high manufacturing cost and high yield strength of acid-resistant steel, and achieve excellent welding performance, low yield strength ratio, and excellent atmospheric corrosion resistance. Effect

Active Publication Date: 2022-04-01
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The acid-resistant steel involved in the third patent (CN109628843A) has a relatively high yield strength, and the addition of precious alloy Mo results in higher manufacturing costs

Method used

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  • A hot-rolled low-yield ratio high-strength acid corrosion-resistant steel plate and its production method
  • A hot-rolled low-yield ratio high-strength acid corrosion-resistant steel plate and its production method
  • A hot-rolled low-yield ratio high-strength acid corrosion-resistant steel plate and its production method

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with examples.

[0043] The invention provides a hot-rolled low-yield ratio high-strength acid corrosion-resistant steel plate and a production method thereof. The main chemical composition and weight percentage content (wt%) of the steel strip are C: 0.06-0.08%; Si: 0.20%~0.40%; Mn: 0.80~1.20%; P: ≤0.012%; S: ≤0.005%; Cr: 0.70~1.20%; Ni: 0.10~0.30%; 0.045%; Nb: 0.015~0.030%; Ti: 0.010~0.025%; Sb: 0.06~0.12%; the balance is Fe and unavoidable inclusions, and Pcm=C+Si / 30+(Mn+Cu+Cr) / 20+Mo / 15+Ni / 60+V / 10+5B≤0.20%.

[0044] The invention adopts the traditional hot continuous rolling process to produce, and the process flow includes: deep desulfurization of molten iron pretreatment→converter smelting→external refining→continuous casting→stacking and slow cooling→slab heating→controlled rolling→controlled cooling→coiling.

[0045] 1) Carry out molten steel smelting according to the above chemical composi...

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Abstract

The invention discloses a hot-rolled low-yield-ratio high-strength acid corrosion-resistant steel plate and a production method thereof. The main chemical composition and weight percentage content thereof are: C 0.06-0.08%; Si 0.20%-0.40%; Mn 0.80-0.00% 1.20%; P≤0.012%; S≤0.005%; Cr 0.70~1.20%; Ni 0.10~0.30%; Cu 0.20~0.40%; Alt 0.020~0.045%; 0.06~0.12%; the balance is Fe and unavoidable inclusions; the present invention adopts microalloying control technology combined with controlled rolling and controlled cooling principles, based on microstructure type control, deep desulfurization in molten iron pretreatment→converter smelting→furnace External refining→continuous casting→stacking and slow cooling→slab heating→controlled rolling→controlled cooling→coiling Hot continuous rolling strip production line develops high-strength acid-resistant steel products with low yield ratio, excellent formability and acid corrosion resistance , can be used in the manufacture of steel structures serving in acidic corrosive medium environments in transportation, tobacco, electric power, chemical energy, metallurgy and other industries.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials and their production, and in particular relates to a hot-rolled low yield ratio high-strength acid corrosion-resistant steel plate and a production method thereof. Background technique [0002] In metallurgy, petrochemical, electric power and other industries with heavy oil or coal as the main fuel for flue gas treatment systems, the sulfur in the fuel produces a large amount of SO during the combustion process. 3 , SO 2 Such as acidic medium gas, acidic medium gas and water vapor combine to form sulfuric acid vapor. When encountering low temperature components, condensation on the surface will easily cause severe sulfuric acid dew point corrosion, greatly shortening the service life of components. Sulfuric acid dew point corrosion-resistant steel has good sulfuric acid corrosion resistance, and is widely used in air preheaters, heat exchangers, economizers, desulfurization and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/60C21C1/02C21D8/02C21C7/076C21C7/00
CPCC22C33/04C21C1/02C21C7/076C21C7/0056C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/60C21D8/0205C21D8/0263C21D8/0226C21D2211/005C21D2211/002C21D2211/008Y02P10/20
Inventor 胡学文何博张建朱涛郭锐王海波汪飞石践李雄杰
Owner MAANSHAN IRON & STEEL CO LTD
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