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A rolling process of vanadium-containing weather-resistant hot-rolled h-beam with a yield strength of 500mpa

A technology of yield strength and H-shaped steel, which is applied in metal rolling and other directions, can solve the problems of production cost reduction, achieve cost reduction, good steel performance, and improve steel performance and surface quality.

Active Publication Date: 2015-10-07
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the high-weather resistance hot-rolled H-beam with a yield strength of 500MPa disclosed in this patent document, the Nb content ranges from 0.04 to 0.06wt%, and the higher amount of V is replaced by Nb, combined with other lower amounts of alloying elements. High weather resistance hot-rolled H-beam products can meet the steel strength requirements, and the production cost is greatly reduced, but with the increase in productivity, some insurmountable quality defects appear in the production process

Method used

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  • A rolling process of vanadium-containing weather-resistant hot-rolled h-beam with a yield strength of 500mpa
  • A rolling process of vanadium-containing weather-resistant hot-rolled h-beam with a yield strength of 500mpa
  • A rolling process of vanadium-containing weather-resistant hot-rolled h-beam with a yield strength of 500mpa

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Experimental program
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Effect test

Embodiment 1

[0028] The rolling process of the vanadium-containing weather-resistant hot-rolled H-shaped steel with a yield strength of 500MPa. The composition of the vanadium-containing weather-resistant hot-rolled H-shaped steel is calculated by mass percentage (wt%): C: 0.10, Si: 0.45, Mn: 1.48, P : 0.017, S: 0.016, Cu: 0.36, Cr: 0.36, Ni: 0.32, V: 0.104, Als: 0.020, the rest is iron and residual trace impurities;

[0029] The rolling process of the vanadium-containing weather-resistant hot-rolled H-beam with a yield strength of 500MPa is as follows:

[0030] Taking the H-shaped steel with a specification of 600×200×15×20 as an example, the shaped billet is heated to 1255°C in the heating furnace: the starting rolling temperature of the billet mill rolling stage is 1138°C, the starting rolling temperature of the universal rolling mill is 942°C, and the final rolling temperature is 942°C. Temperature 913°C;

[0031] Immediately after rolling, two-stage rapid water cooling is adopted. Th...

Embodiment 2

[0035] The rolling process of the vanadium-containing weather-resistant hot-rolled H-shaped steel with a yield strength of 500MPa. The composition of the vanadium-containing weather-resistant hot-rolled H-shaped steel is calculated by mass percentage (wt%): C: 0.12, Si: 0.55, Mn: 1.44, P : 0.016, S: 0.011, Cu: 0.29, Cr: 0.32, Ni: 0.26, V: 0.110, Als: 0.023, the rest is iron and residual trace impurities;

[0036] The rolling process of vanadium-containing weather-resistant hot-rolled H-beam with a yield strength of 500MPa is as follows:

[0037] Taking the H-shaped steel with a specification of 600×200×15×20 as an example, the profiled billet is heated to 1250°C in the heating furnace: the starting rolling temperature of the blanking machine rolling stage is 1132°C, the starting rolling temperature of the universal rolling mill is 936°C, and the final rolling Temperature 908°C;

[0038]Immediately after rolling, two-stage rapid water cooling is adopted. The process parameters...

Embodiment 3

[0042] The rolling process of the vanadium-containing weather-resistant hot-rolled H-shaped steel with a yield strength of 500MPa, the composition of the vanadium-containing weather-resistant hot-rolled H-shaped steel, in terms of mass percentage (wt%): C: 0.09, Si: 0.44, Mn: 1.39, P : 0.017, S: 0.013, Cu: 0.27, Cr: 0.38, Ni: 0.25, V: 0.106, Als: 0.014, the rest is iron and residual trace impurities;

[0043] The rolling process of vanadium-containing weather-resistant hot-rolled H-beam with a yield strength of 500MPa is as follows:

[0044] Taking the H-shaped steel with a specification of 600×200×15×20 as an example, the shaped billet is heated to 1230°C in the heating furnace: the starting rolling temperature of the billet mill rolling stage is 1112°C, the starting rolling temperature of the universal rolling mill is 927°C, and the final rolling Temperature 918°C;

[0045] Immediately after rolling, two-stage rapid water cooling is adopted. The process parameters of the fi...

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Abstract

The invention discloses a rolling process of vanadium-containing weather-resistant hot-rolling H-shaped steel with yield strength of 500 MPa. The vanadium-containing weather-resistant hot-rolling H-shaped steel comprises the following components in percentage by mass: 0.09 to 0.12 percent of C, 0.43 to 0.55 percent of Si, 1.39 to 1.49 percent of Mn, 0.013 to 0.017 percent of P, 0.011 to 0.016 percent of S, 0.27 to 0.36 percent of Cu, 0.32 to 0.38 percent of Cr, 0.25 to 0.32 percent of Ni, 0.098 to 0.110 percent of V, 0.014 to 0.023 percent of AlS and the balance of iron and residual trace impurities. According to the rolling process of the vanadium-containing weather-resistant hot-rolling H-shaped steel, the highly weather-resistant H-shaped steel can be manufactured by reasonably adjusting the proportioning of the components of the steel and adopting the rolling process, wherein the surface quality and the qualified rate of the H-shaped steel are greatly improved, the yield strength reaches 500 MPa and the weather resistance is high.

Description

technical field [0001] The invention relates to the technical field of metal material production, in particular to a rolling process of vanadium-containing weather-resistant hot-rolled H-shaped steel with a yield strength of 500 MPa. Background technique [0002] Weather-resistant H-beams are mainly used in the manufacture of heavy-duty train girders and bridges, which play an important role in reducing weight, prolonging service life, increasing speed, increasing freight volume and reducing logistics costs. Especially with the rapid development of the national economy, the railway transportation industry is moving towards high-speed, heavy-duty, and long-life directions, and there is an urgent need for hot-rolled H-shaped steel with high weather resistance, high strength, and high toughness. [0003] Since the high weather resistance H-beam requires high weather resistance, high strength, excellent low temperature impact toughness and welding performance, and good surface q...

Claims

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Application Information

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IPC IPC(8): C22C38/46C21D8/00B21B1/088
Inventor 吴保桥张卫斌龚庆华于同仁彦井成
Owner MAGANG (GROUP) HOLDING CO LTD