TMCP type high strength and toughness high fatigue resistance weather-proof bridge steel plate, and preparation method thereof

A technology of fatigue performance and steel plate, which is applied in the field of metallurgy to achieve the effect of improving toughness, improving purity and good corrosion resistance

Active Publication Date: 2019-01-01
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The publication number is CN 106811704 A, which proposes a bridge steel with a yield strength of 500MPa and a low yield ratio bridge steel and its manufacturing method. Its strength level reaches 500MPa,

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  • TMCP type high strength and toughness high fatigue resistance weather-proof bridge steel plate, and preparation method thereof
  • TMCP type high strength and toughness high fatigue resistance weather-proof bridge steel plate, and preparation method thereof
  • TMCP type high strength and toughness high fatigue resistance weather-proof bridge steel plate, and preparation method thereof

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[0044] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0045] The thickness of the TMCP type high-strength, high-fatigue and weather-resistant bridge steel plate involved in this embodiment is 30 and 60 mm, and the welding cold crack sensitivity coefficient P cm The smaller the value, the better the welding performance of the steel, and it is not easy to produce cold welding cracks during welding; the corrosion resistance index I is calculated according to the Legault-Leckie formula revised in the America...

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Abstract

The invention discloses a TMCP type high strength and toughness high fatigue resistance weather-proof bridge steel plate, and a preparation method thereof. The TMCP type high strength and toughness high fatigue resistance weather-proof bridge steel plate comprises, by weight, 0.05 to 0.08% of C, 0.12 to 0.18% of Si, 1.4 to 1.6% of Mn, 0.045 to 0.058% of Nb, 0.01 to 0.02% of Ti, 0.30 to 0.35% of Cu, 0.22 to 0.30% of Cr, 0.45 to 0.55% of Ni, 0.02 to 0.04% of Al, 0.05 to 0.12% of Mo, P<=0.009%, S<=0.005%, and the balance Fe and other unavoidable impurities. The advantages are that: product performance is excellent; the yield strength is larger than 500MPa; -60 DEG C crack-tip opening displacement index is 0.3mm or higher; 10 million time fatigue strength is 170MPa or higher; and corrosion weight loss rate is 3.0g/(m2*h) or lower.

Description

technical field [0001] The application belongs to the technical field of metallurgy, and in particular relates to a TMCP type weather-resistant bridge steel plate with high strength, toughness and high fatigue performance and a preparation method thereof. Background technique [0002] The rapid development of bridge construction technology in my country has promoted the rapid replacement and development of bridge steel. At present, the main span of some new cable-stayed bridges has reached the kilometer level, and ordinary strength bridge steel can no longer meet the force requirements of bridge bars. Q370qD / E high-performance bridge steel has become the mainstream steel grade, and higher performance The Q500qE class has also been applied to national key projects such as the Hutong Bridge and Pingtan Bridge under construction. [0003] High-performance bridge steel needs to have high strength (yield 370MPa and above), high toughness (impact energy not less than 120J), low y...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/58C21C1/02C21C7/064C21C7/10C21D8/02C22C33/04
CPCC21C1/02C21C7/064C21C7/10C21D8/0205C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/58
Inventor 程丙贵刘东升曲锦波
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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