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Steel for chemical equipment fastener and production method thereof

A technology of chemical equipment and production method, which is applied to the steel for fasteners, the steel for chemical equipment fasteners and their production fields, to achieve the effects of improving the purity, ensuring the uniformity of the organization and the reasonable process

Active Publication Date: 2014-02-19
LAIWU IRON & STEEL GRP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as users have higher and higher requirements for the strength and high-temperature mechanical properties of steel materials, and require materials to have better chemical stability in the service environment of high temperature, high pressure, and high temperature steam corrosion, from these two points, The national standard 35CrMo is difficult to meet the needs of users

Method used

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  • Steel for chemical equipment fastener and production method thereof
  • Steel for chemical equipment fastener and production method thereof
  • Steel for chemical equipment fastener and production method thereof

Examples

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preparation example Construction

[0032] A method for preparing steel for fasteners on American Standard chemical equipment comprises the following steps:

[0033] (1) Electric furnace smelting

[0034] Electric furnace smelting is used. In order to effectively reduce the content of inclusions in steel, the amount of molten iron added in electric furnace smelting should be increased to more than 60%. The raw materials entering the furnace should be optimized, and high-phosphorus and high-sulfur scrap steel such as slag iron and can side iron are not allowed. . The whole process of electric furnace smelting maintains foam slag operation, ensures good oxidation boiling, promotes the removal of gases and inclusions, and ensures the oxidation, high alkalinity and fluidity of electric furnace slag for rapid dephosphorization, in order to ensure that the finished steel [P]≤ 0.015wt%, control electric furnace end point [P] ≤ 0.012wt%. High-temperature rapid decarburization, because the carbon content in the finishe...

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Abstract

The invention discloses steel for a chemical equipment fastener and a production method thereof. The steel for the chemical equipment fastener comprises, by weight, 0.49-0.52% of C, 0.20-0.25% of Si, 0.85-1.00% of Mn, 0.95-1.10% of Cr, 0.15-0.20% of Mo, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.060% of Alt and the balance Fe and unavoidable impurities. The production method comprises electric furnace smelting, LF external refining, VD furnace vacuum treatment, continuous casting and rolling. Compared with the existing medium C-Cr-Mo steel, the steel provided by the invention has better comprehensive mechanical properties and high-temperature stability and has a certain corrosion resistance.

Description

technical field [0001] The invention relates to the field of steel for chemical equipment, in particular to a steel for fasteners of chemical equipment and a production method thereof. The steel for fasteners is American standard medium carbon CrMo alloyed chemical equipment with good comprehensive mechanical properties and high temperature stability. It is a steel for fasteners with certain resistance to high temperature steam corrosion. Background technique [0002] The chemical production process is mainly based on chemical reactions at high temperature and high pressure. Therefore, steel for chemical equipment must have high-temperature chemical stability, excellent high-temperature mechanical properties (creep resistance), and organizational stability during high-temperature operation. In addition, good corrosion resistance is also required, that is, good intergranular corrosion resistance is required after thermal sensitization, and good stress corrosion resistance is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C33/04
Inventor 欧阳峥容翟正龙戈文英梁娜朱京军张伟郑桂云袁淑君窦圣朋
Owner LAIWU IRON & STEEL GRP
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