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AlSi type economical and weather resistant steel

A kind of weathering steel and economical technology, applied in the field of steel structure and low alloy carbon steel, can solve the problems of high cost and difficulty in marketization

Inactive Publication Date: 2009-01-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned patents have improved the performance of steel, the cost is too high, and there is great difficulty in marketization

Method used

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  • AlSi type economical and weather resistant steel
  • AlSi type economical and weather resistant steel
  • AlSi type economical and weather resistant steel

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Experimental program
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Effect test

Embodiment Construction

[0020] Table 1, chemical composition of the present invention: (wt%)

[0021] C

[0022] Better chemical composition: (wt%)

[0023] C: 0.15~0.21; Si: 0.3~2; Mn: 0.3~0.6; RE: 0.02~0.15; S≤0.04; P≤0.034; Al: 0.05~4; the rest are Fe and trace impurities.

[0024] The chemical composition of table 2, embodiment 1: (wt%)

[0025] C

[0026] Table 2 shows the chemical composition of an embodiment of the present invention, namely C: 0.18, Si: 0.7, Mn: 0.54, Al: 0.5, S: 0.017, P: 0.015, RE: 0.05, and the rest are Fe and trace impurities . The weight gain results, polarization curves and electrochemical impedance spectroscopy (EIS) results of the 0.3 (wt)% NaCl solution laboratory accelerated corrosion test are shown in the attached figure 1 , attached figure 2 And attached image 3 . Accompanying drawing 4 is the equivalent circuit diagram of EIS.

[0027] from figure 1 It can be seen that after 40 cycles (20 days) accelerated test, the anti-[Cl-] c...

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Abstract

This invention relates to an anti-corrosion low alloy carbon steel including the following alloy components: Al, Si and RE, and the weight percentage of which includes: C: 0.12-0.21, Si: 0.3-8.0, Mn: 0.3-0.6, RE: 0.02-0.2, S is less than or equal to 0.04, P is less than or equal to 0.034, Al is greater than 0.01 and less than 8, the rest is Fe and minim impurities, which prepares an economic AlSi anti-air corrosion steel with Al and Si alloy as the main material matched with RE.

Description

Technical field [0001] The invention relates to the field of low-alloy steel, especially economical low-alloy carbon steel resistant to atmospheric corrosion, which is mainly used for railways, highway guardrails, mining facilities, agricultural machinery, advertising light boxes, towers, etc., which are exposed to the atmosphere for a long time steel structure. Background technique [0002] At present, the former Soviet Union (SU1822446A3), Japanese patents (JP 9-277083, JP 1-92341), and European patents (EP 0841409A1) have introduced atmospheric corrosion-resistant steels in the existing technical publications, but generally adopt Add Cu, P, Cr, Ni, W and other alloying elements to steel, and some also add As, Mo, Nb, Ce, Co, Ti, V and other elements. Although the above-mentioned patents have improved the performance of steel, the cost is too high, and there is great difficulty in marketization. Contents of the invention [0003] Aiming at the defects and deficiencies ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06
Inventor 董俊华韩恩厚柯伟陈新华
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI