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High-toughness weather-proof hot-rolled H-shaped steel for bridge structure with yield strength of 460 MPa and production method thereof

A yield strength and bridge structure technology, applied in metal rolling and other directions, can solve problems such as complex deformation, achieve fine-grain strengthening, improve sensitivity, and ensure various performance effects

Active Publication Date: 2018-11-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the hot-rolled H-beam is rolled with a pass, not only the deformation is complicated, but also the distribution of deformation between each pass is very limited. It is necessary to add a certain amount of alloy to ensure weather resistance, and how to obtain higher strength and excellent Low-temperature toughness is an industrial problem for hot-rolled H-beams

Method used

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  • High-toughness weather-proof hot-rolled H-shaped steel for bridge structure with yield strength of 460 MPa and production method thereof
  • High-toughness weather-proof hot-rolled H-shaped steel for bridge structure with yield strength of 460 MPa and production method thereof

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Effect test

Embodiment 1

[0022] A high-toughness and weather-resistant hot-rolled H-section steel for bridge structures with a yield strength of 460MPa. Its specification is H600×200×11×17. The chemical composition of the hot-rolled H-section steel is as follows by mass percentage: C: 0.10, Si: 0.39, Mn: 1.44, P: 0.011, S: 0.006, Cr: 0.61, Ni: 0.33, Cu: 0.35, V: 0.084, Nb: 0.018, Alt: 0.020, the rest are Fe and trace residual elements.

[0023] The production method includes the following steps: hot metal pretreatment, converter smelting, argon blowing refining, LF refining, shaped billet protection continuous casting, H-beam rolling, and air cooling after rolling.

[0024] In the H-beam rolling steps:

[0025] The billet rolling process is: the heating temperature of the shaped billet is 1237℃~1250°C, the furnace time is 93min; the billet rolling temperature is 1131℃, and the compression ratio from the billet to the final rolling is the total Compression ratio is 23%.

[0026] The universal rolling process ...

Embodiment 2

[0029] A high-toughness and weather-resistant hot-rolled H-section steel for bridge structures with a yield strength of 460MPa. Its specification is H341×315×20×31.8. The chemical composition of the hot-rolled H-section steel is as follows by mass percentage: C: 0.10, Si: 0.38, Mn: 1.49, P: 0.013, S: 0.004, Cr: 0.58, Ni: 0.35, Cu: 0.32, V: 0.091, Nb: 0.022, Alt: 0.023, the rest are Fe and trace residual elements.

[0030] The production method includes the following steps: hot metal pretreatment, converter smelting, argon blowing refining, LF refining, shaped billet protection continuous casting, H-beam rolling, and air cooling after rolling.

[0031] In the H-beam rolling steps:

[0032] The billet rolling process is as follows: the heating temperature of the shaped billet is 1241℃~1252℃, and the furnace time is 97min; the billet rolling temperature is 1137℃, and the compression ratio from the billet to the final rolling is the total The compression ratio is 13%.

[0033] The univer...

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Abstract

The invention discloses a high-toughness weather-proof hot-rolled H-shaped steel for a bridge structure with yield strength of 460 MPa and a production method thereof. The hot-rolled H-shaped steel comprises the following chemical components by weight: C: 0.08-0.11, Si: 0.30-0.45, Mn: 1.30-1.50, P: <=0.020, S: <=0.015, Cr: 0.50-0.65, Ni: 0.30-0.40, Cu: 0.30-0.40, V: 0.075-0.095, Nb: 0.015-0.025, Alt: 0.015-0.030 and the balance Fe and trace residual elements. By means of reasonable composition proportion, press distribution and temperature control rolling, the fine grain strengthening, precipitation strengthening and phase transformation strengthening mechanisms as well as deformation and penetration control are utilized, and direct air cooling is conducted after hot rolling to obtain a complex phase structure of ferrite + bainite + pearlite; the mechanical property can reach the level that ReL is not less than 460MPa, Rm is not less than 570MPa, A is not less than 20%, KV2 is not lessthan 150J under 40oC, and the corrosion rate is not more than 50% compared with that of Q345B.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel, and specifically relates to a high-toughness and weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460MPa and a production method thereof. Background technique [0002] With the development of science and technology and the expansion of the service environment, the technical requirements for the structural steel used in bridges are constantly increasing, especially the low-temperature impact toughness. At present, the hot-rolled H-beams used in bridge structures are all low-alloy steels, with a yield strength of 345MPa and an impact energy requirement of -20°C; while the weather-resistant H-beams used in the structure are all welded, relatively speaking, hot-rolled H-beam has advantages in material utilization, production cycle and labor cost. At present, the country is vigorously promoting steel bridges, and at the same time promoting environmental pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/46C22C38/48C22C38/06B21B1/088
CPCB21B1/088C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48
Inventor 夏勐吴保桥程鼎彦井成邢军吴湄庄龚庆华张卫斌彭林黄琦丁朝晖汪杰何军委魏银丹
Owner MAANSHAN IRON & STEEL CO LTD
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