A kind of high-toughness weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460mpa and its production method

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

Active Publication Date: 2019-07-30
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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  • A kind of high-toughness weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460mpa and its production method
  • A kind of high-toughness weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460mpa and its production method

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Embodiment 1

[0022] A high-toughness weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460MPa, the specification of which is H600×200×11×17. The chemical composition of the hot-rolled H-shaped steel is: 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, and the rest are Fe and trace residual elements.

[0023] The production method comprises the following steps: molten iron pretreatment, converter smelting, argon blowing refining, LF refining, special-shaped billet protection continuous casting, H-shaped steel rolling, and air cooling after rolling.

[0024] In the H-beam rolling step:

[0025] The billet rolling process is as follows: the heating temperature of the special-shaped billet is 1237 ° C ~ 1250 ° C, and the furnace time is 93 minutes; the rolling temperature of the billet rolling is 1131 ° C, and the compression ratio from the billet to the finished product is 23% of the compr...

Embodiment 2

[0029] A high-toughness weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460MPa, the specification of which is H341×315×20×31.8, and the chemical composition of the hot-rolled H-shaped steel is: 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, and the rest are Fe and trace residual elements.

[0030] The production method comprises the following steps: molten iron pretreatment, converter smelting, argon blowing refining, LF refining, special-shaped billet protection continuous casting, H-shaped steel rolling, and air cooling after rolling.

[0031] In the H-beam rolling step:

[0032] The billet rolling process is as follows: the heating temperature of the special-shaped billet is 1241 ° C ~ 1252 ° C, and the furnace time is 97 minutes; the rolling temperature of the billet rolling is 1137 ° C, and the compression ratio from the billet to the finished product is 13% of the...

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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 in particular relates to a high-toughness weather-resistant hot-rolled H-shaped steel for bridge structures with a yield strength of 460 MPa and a production method thereof. Background technique [0002] With the development of science and technology and the expansion of service environment, the technical requirements of bridges for their structural steels are constantly increasing, especially low temperature impact toughness. At present, the hot-rolled H-shaped steel used in the bridge structure is all low-alloy steel, the yield strength level is 345MPa, and the impact energy requirement is -20°C; while the weather-resistant H-shaped steel used in its structure is all welded and formed. H-shaped steel 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 the environmental ...

Claims

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Application Information

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Patent Type & Authority Patents(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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