Marine-climate-corrosion-resistant steel bar

A marine climate and steel bar technology, which is applied in the field of steel bars for construction, can solve problems such as liquid steel absorbing N, inability to guarantee the performance of steel bars, and cold-bending cracking of steel bars, and achieve excellent marine corrosion resistance.

Inactive Publication Date: 2014-10-22
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because it also treats S as a control element, it is considered that the lower the better, but the S content is too low to cause the liquid steel to absorb N, make the steel bar brittle, and reduce the yield strength and aging performance
When P≥0.040%, the steel bar is prone to cold-bending cracking, and the performance of the steel bar cannot be guaranteed

Method used

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  • Marine-climate-corrosion-resistant steel bar
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Embodiment Construction

[0024] The present invention is described in detail below:

[0025] Table 1 is the value list of each embodiment of the present invention and comparative examples;

[0026] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0027] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0028] Each embodiment of the present invention is produced according to the following routine steps:

[0029] 1) Smelting; and controlling the weight percentage of phosphorus in the molten iron within the set range; adding scrap steel accounting for 12.2-15% of the total volume to the converter;

[0030] 3) Conventional oxygen blowing;

[0031] 4) Conventional baking of the ladle;

[0032] 5) Tapping: Tapping begins when the temperature of molten steel reaches 1670-1685°C and the weight percentage of C is controlled at 0.08%;

[0033] 6) Perform argon blowing an...

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Abstract

The invention relates to a marine-climate-corrosion-resistant steel bar which comprises the following components in percentage by weight: 0.2%-0.25% of C, 0.35%-0.55% of Si, 1.0%-1.35% of Mn, 0.01%-0.04% of P, 0.005-0.03% of S, 0.05%-0.3% of Cu, 0.04%-0.25% of Ni, 0.05%-0.3% of Cr, and the balance of Fe and inevitable impurities. The Ceq does not exceed 0.54%.Under the conditions that the yield strength is not lower than 400 MPa, the tensile strength is not lower than 540 MPa, the elongation percentage A is not lower than 16%, the total elongation percentage Agt / % under maximal power is not lower than 9% and the cold bending performance is qualified, the marine corrosion resistance is high and is enhanced from 1.00% to 1.43%, so that the steel bar can not crack when in use.

Description

technical field [0001] The invention relates to a steel bar for construction, in particular to a marine climate corrosion-resistant steel bar. Background technique [0002] With the continuous understanding, development and utilization of marine resources by human beings, it is inevitable to build buildings on or near the ocean. However, due to marine climate issues, the life cycle of building objects is of concern to people. This mainly involves resistance to seawater corrosion or marine climate corrosion. Therefore, it is a problem that people must consider to produce and study building steel products that are resistant to seawater corrosion and marine climate corrosion. [0003] After searching, the Chinese patent application number is CN200910243828.9 patent document, its C: 0.08~0.25, Si: 0.35~1.1, Mn: 0.7~2.0, Cu: 0.20~0.80, Cr: 0.30~1.6, Ni: 0.20~ 1.0, P: 0.05~0.10, S: ≤0.010, the balance is Fe and unavoidable impurity elements; or, at the same time, add one or mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42
Inventor 朱兆顺卜勇张渊普余爱华黄红明曹立潮吴本胜万升陈勇
Owner 武钢集团有限公司
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