A kind of 1000mpa grade sulfuric acid dew point corrosion resistant bolt steel and preparation method thereof

A dew point corrosion and sulfuric acid resistance technology, applied in the field of steel smelting, which can solve the problems of inability to meet the strength and acid resistance.

Active Publication Date: 2021-02-12
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the above disclosed patents can meet the strength and acid resistance requirements of the 1000Mpa-grade sulfuric acid dew point corrosion-resistant high-strength bolt steel that is suitable for coating-free steel structure factories in the fields of metallurgy, electric power, and petrochemicals.

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  • A kind of 1000mpa grade sulfuric acid dew point corrosion resistant bolt steel and preparation method thereof
  • A kind of 1000mpa grade sulfuric acid dew point corrosion resistant bolt steel and preparation method thereof
  • A kind of 1000mpa grade sulfuric acid dew point corrosion resistant bolt steel and preparation method thereof

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preparation example Construction

[0035] Based on the same inventive concept, the present application also provides a method for preparing 1000Mpa grade sulfuric acid dew point corrosion-resistant bolt steel, which is characterized in that it comprises the following steps:

[0036] S1: Use converter to smelt molten iron or electric furnace to melt scrap steel, and add aluminum at the end of converter or electric furnace to deoxidize molten steel, and control the oxygen activity of molten steel at LF to ≤0.0008%;

[0037] S2: during the tapping process of the converter or electric furnace, according to the chemical composition of the steel, add Cr, Ni, Cu, Sb, Sn and at least one of the following alloy elements: Mo, V, Nb;

[0038] S3: LF refining molten steel, the basicity of the LF refining slag is controlled to be 4.5-7.5;

[0039] S4: LF fine-tunes the Cr, Ni, Cu, Sb and Sn, or Mo or V or Nb alloy composition, and within 10 minutes before the end of the LF refining, according to the chemical composition of ...

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Abstract

The invention particularly relates to 1000 Mpa-grade sulfuric acid dew point corrosion resistant bolt steel and a preparation method thereof, and belongs to the field of steel smelting. The 1000 Mpa-grade sulfuric acid dew point corrosion resistant bolt steel provided by the embodiment of the invention comprises the following chemical components in percentage by weight: C: 0.20-0.25%, Si: 0.20-0.30%, Mn: 0.60-1.60%, Cr: 0.90-1.20%, Ni: 0.20-0.60%, Cu: 0.2-0.6%, Sb: 0.05-0.15, Sn: 0.06-0.15%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, and the balance is Fe and inevitable impurity elements.

Description

technical field [0001] The invention belongs to the field of steel smelting, and in particular relates to a 1000Mpa grade sulfuric acid dew point corrosion-resistant bolt steel and a preparation method thereof. Background technique [0002] Sulfuric acid dew point corrosion is manifested in that when the surface temperature of the device contacting the flue gas is lower than 150°C, the sulfuric acid in the flue gas has a dew point, and the sulfuric acid condenses on the metal surface and strongly corrodes the metal. Bolts play the role of connection, fastening, positioning, sealing, etc. in the mechanism. Bolts need to be pre-tightened during installation, so they all bear static tensile loads. At the same time, bolts also face the problem of sulfuric acid dew point corrosion. How to meet the requirements of bolts? On the basis of the high strength of steel, enhancing its resistance to sulfuric acid dew point corrosion has become a technical problem that needs to be solved u...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/58C22C38/60C21C7/06C21C7/00
CPCC21C7/0006C21C7/06C22C38/002C22C38/008C22C38/02C22C38/04C22C38/42C22C38/58C22C38/60Y02P10/20
Inventor罗志俊王晓晨孙齐松吕迺冰李舒笳徐士新周洁王勇陈涛刘珂
OwnerSHOUGANG CORPORATION