Weather-resistant bridge steel with yield strength not less than 345 MPa and preparation method thereof

A technology of yield strength and bridge steel, which is applied in the field of iron and steel smelting, can solve the problems of high production cost, and achieve the effects of low cost, favorable promotion and application, and small electrode potential difference in micro-regions

Inactive Publication Date: 2019-05-24
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN 103290331 A discloses a high-strength and high-corrosion-resistant steel plate with a yield strength of 450 MPa and a production method thereof. Its C: 0.002-0.005%, Cr: 2.80-4.00%, are produced with ultra-low carbon and high alloy components, and the production high cost

Method used

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  • Weather-resistant bridge steel with yield strength not less than 345 MPa and preparation method thereof
  • Weather-resistant bridge steel with yield strength not less than 345 MPa and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A weather-resistant bridge steel with a yield strength not less than 345MPa. The chemical composition of the 60mm weather-resistant bridge steel prepared in this example is as follows: C: 0.08%, Si: 0.23%, Mn: 1.0%, P: 0.012%, S: 0.003% , Al: 0.03%, Cr: 0.30%, Cu: 0.32%, Ni: 0.30%, Nb: 0.03%, Ti: 0.018%, and the rest are Fe and unavoidable impurities.

[0033] Its preparation method is as follows:

[0034] 1. Smelting: smelting by oxygen top blown converter steelmaking method, top and bottom double blowing, fully decarburization and dephosphorization; then through LF refining, RH vacuum treatment, reduce the content of harmful elements / impurities, and carry out microalloying; and then carry out continuous Casting, full protection casting, casting end, heavy billet adopts heavy reduction technology, the reduction ratio is 10%, and the cast billet is obtained;

[0035] 2. Slow cooling: After the slab is cut, put it into the slow cooling pit, and the slow cooling time is ...

Embodiment 2

[0042] A weather-resistant bridge steel with a yield strength not less than 345MPa. The chemical composition of the 10mm weather-resistant bridge steel prepared in this example is as follows: C: 0.09%, Si: 0.22%, Mn: 0.9%, P: 0.011%, S: 0.003% , Al: 0.028%, Cr: 0.25%, Cu: 0.30%, Ni: 0.28%, Nb: 0.04%, Ti: 0.019%, and the rest are Fe and unavoidable impurities.

[0043] Its preparation method is as follows:

[0044] 1. Smelting: smelting by oxygen top blown converter steelmaking method, top and bottom double blowing, fully decarburization and dephosphorization; then through LF refining, RH vacuum treatment, reduce the content of harmful elements / impurities, and carry out microalloying; and then carry out continuous Casting, full protection casting, casting end, heavy billet adopts heavy reduction technology, the reduction ratio is 9%, and the cast billet is obtained;

[0045] 2. Slow cooling: After the billet is cut, put it into the slow cooling pit, and the slow cooling time i...

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Abstract

The invention relates to weather-resistant bridge steel with yield strength not less than 345 MPa and a preparation method thereof. The weather-resistant bridge steel with the yield strength not lessthan 345 MPa comprises the following components of, in percentage by weight, 0.07%-0.11% of C, 0.15%-0.30% of Si, 0.80-1.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.01-0.04% of Al, 0.20-0.40% of Cr, 0.20-0.40% of Cu, 0.20-0.50% of Ni, 0.020-0.050% of Nb, 0.010-0.040% of Ti and the balance Fe and inevitable impurities; and the preparation method comprises thefollowing steps of smelting, slow cooling, heating, rolling, cooling and stacking and cooling. According to the weather-resistant bridge steel with the yield strength not less than 345 MPa and the preparation method thereof, the low-cost micro-alloying design is adopted, the production period is short, the cost is low, popularization and application are facilitated, the weather-resistant bridge steel has excellent welding performance, strong toughness and strong plasticity matching performance, low yield ratio, corrosion resistance, weather resistance, welding performance and anti-fatigue performance, compared with traditional weather-resistant steel, the weather resistance is improved by one time or above, the weather-resistant bridge steel can replace the traditional high-strength weathering steel, and can be applied to the fields of bridges, outdoor tower frames and the like without coating, so that the use cost and the maintenance cost are reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a weather-resistant bridge steel with a yield strength of not less than 345MPa and a preparation method thereof. Background technique [0002] The bridge has been exposed to the air for a long time, and it has been corroded and worn out for a long time. The cost of anti-corrosion accounts for a large proportion of the maintenance cost of the steel bridge in the later period; It reduces the operation and maintenance costs of steel structures, and has significant economic and environmental effects. Therefore, weathering steel has significant advantages over ordinary steel in the application of large-scale steel structure projects such as bridges and building structures. [0003] CN 1962917 A discloses a special high-strength weather-resistant atmospheric corrosion steel, which has high content of Mn, Cr, Ni, Nb and Mo, high production cost, and the product is a hot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C21D8/02
Inventor 李灿明胡淑娥侯东华成小龙王国强韩启彪孙京波杨建勋胡晓英孔雅刘熙章李博王军代平王振华
Owner SD STEEL RIZHAO CO LTD
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