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High-strength easy-formation atmospheric corrosion resisting steel

An atmospheric corrosion-resistant steel, high-strength technology applied to steel. It can solve problems such as no specific plan disclosed, and achieve the effect of improving welding efficiency, excellent welding performance, and simplifying welding process.

Inactive Publication Date: 2008-08-06
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

The yield strength after controlled rolling and controlled cooling is only ≥450MPa, and the patent publication does not disclose a specific scheme for containing Mo in the steel composition

Method used

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Embodiment Construction

[0035] Preferred embodiments of the present invention are described in detail below.

[0036] Table 1 lists the chemical composition of several specific examples of the high-strength easily formable atmospheric corrosion-resistant steel that can be used in the manufacture of containers and other engineering corrosion-resistant components. The production methods of these kinds of steel are as follows: top-bottom compound blowing is carried out on an 80-ton converter in a steelmaking plant, and the technology of deep desulfurization and dephosphorization of molten iron is adopted to make the S in the molten iron ≤ 0.01%, and then the top-bottom blowing of the converter, Feed Al wire for deoxidation, vacuum treatment after the furnace, so that the chemical composition in the steel meets the requirements in Table 1, and the balance is Fe and inevitable inclusions. Continuous casting feeds rare earth wires in the crystallizer or performs calcium treatment in the LF furnace. Then p...

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Abstract

The invention relates to high strength easily forming atmospheric corrosion resistant steel. The invention provides the high strength easily forming atmospheric corrosion resistant steel aiming at the problems in existing steel that the weatherability is bad and the service life is lowered under the condition that the thickness is thinned. The high strength easily forming atmospheric corrosion resistant steel is composed of components of following weight percent: C: 0.04-0.09%, Si: 0.10-0.50%, Mn: 1.20-1.70%, P: <=0.020%, S: < =0.010%, Cu: 0.20-0.60%, Cr: 0.40-0.80%, Ni: 0.20-0.50% and Nb: 0.03-0.07%, and also comprises one or a plurality of Mo: <=0.20%, Ti: <=0.03% and Als: <=0.035%, and allowance is Fe and unavoidable impurity. The yield strength of the steel of the invention is more than or equal to 550MPa, the tensile strength is more than or equal to 650MPa, the percentage elongation is more than or equal to 18%, the corrosion resistance is equivalent to SPA-H steel which is used for previous containers, and the steel has excellent welding performance, cold roll forming performance and low temperature impact toughness, which is beneficial for extending and applying.

Description

technical field [0001] The present invention relates to a steel. Background technique [0002] With the continuous development of the container industry, container manufacturers use high-strength steel (yield strength ≥ 550MPa, tensile strength ≥ 600MPa) to make container semi-trailers exported to Europe, the United States, and Canada to reduce the weight of the box and enhance the impact resistance. , to increase the loading weight. The high-strength steel types currently used do not have weather resistance. When the strength increases and the thickness of the box body decreases, it will have the negative effect of reducing the service life of the box body under the condition of thinning thickness. [0003] In order to significantly improve the atmospheric corrosion resistance of steel, it is generally used to add a certain amount of alloying elements such as Cu and P to the steel, such as the high phosphorus, copper plus nickel, chromium atmospheric corrosion resistant st...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50
Inventor 宋育来陈邦文陈吉清胡敏刘志勇郑华周一中孔勇江程杨
Owner 武钢集团有限公司
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