Production method of low-cost high-toughness Q460qNHD steel plate

A steel plate production method and high toughness technology, applied in the direction of metal rolling, can solve the problem of low toughness, and achieve the effects of good toughness, low manufacturing cost and high furnace temperature

Active Publication Date: 2022-01-21
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of the weathering steel produced by this method meets the requirements, but the toughness is low. In addition, this method is suitable for the production of hot-rolled coils

Method used

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  • Production method of low-cost high-toughness Q460qNHD steel plate
  • Production method of low-cost high-toughness Q460qNHD steel plate
  • Production method of low-cost high-toughness Q460qNHD steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] It is produced by a wide and thick plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm. The central segregation of the cast slab is C2.0, and rolled into a 15mm thick steel plate. Molten steel is subjected to RH treatment. During the treatment, the vacuum degree is below 110Pa for 18.5 minutes. The superheat degree during slab casting is 26°C. The continuous casting adopts electromagnetic stirring and light pressing. The frequency of electromagnetic stirring is 6.5Hz and the current is 310A. The pressing position is the 7th, 8th, and 9th sections, and the pressing amount is 2.6mm, 2.6mm, and 2.6mm. The slab is cast from the casting machine, after cutting, before entering the heating furnace, the surface is sprayed with water for laminar flow cooling, and the water flow density on the upper surface of the slab during laminar flow cooling is 185l / (min m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8....

Embodiment 2

[0038] It is produced by a wide and thick plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm. The central segregation of the cast slab is C0.5, and rolled into a 32mm thick steel plate. Molten steel is subjected to RH treatment, the vacuum degree is below 110Pa for 19.5 minutes during treatment, the superheat degree during slab casting is 13°C, continuous casting adopts electromagnetic stirring and light pressing, the frequency of electromagnetic stirring is 6.5Hz, and the current is 310A. The pressing position is the 7th, 8th, and 9th sections, and the pressing amount is 2.6mm, 2.6mm, and 2.6mm. The slab is cast from the casting machine, after being cut off, before entering the heating furnace, the surface is sprayed with water for laminar flow cooling, and the water flow density on the upper surface of the slab during laminar flow cooling is 188l / (min m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. ...

Embodiment 3

[0048] It is produced by a wide and thick plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm. The slab center segregation is C1.0, and rolled into a 22mm thick steel plate. Molten steel is subjected to RH treatment, the vacuum degree is below 110Pa for 19.0 minutes during treatment, the superheat degree during slab casting is 18°C, continuous casting adopts electromagnetic stirring and light pressing, the frequency of electromagnetic stirring is 6.5Hz, and the current is 310A. The pressing position is the 7th, 8th, and 9th sections, and the pressing amount is 2.6mm, 2.6mm, and 2.6mm. The slab is cast from the casting machine, after cutting, before entering the heating furnace, the surface is sprayed with water to carry out laminar flow cooling, and the water flow density on the upper surface of the slab is 192l / (min m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. Cooldown is 95 seconds. When entering...

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Abstract

The invention discloses a production method of a low-cost high-toughness Q460qDNH steel plate. The method is used for producing the Q460qDNH steel plate with good surface quality and mechanical property through proper processes of smelting, continuous casting, heating, controlled rolling, controlled cooling and descaling. The steel plate is good in strength, plasticity and toughness, and the structure is fine ferrite and pearlite. The yield strength of the steel plate ranges from 498 MPa to 546 MPa, the tensile strength ranges from 589 MPa to 625 MPa, the ductility ranges from 21% to 26.5%, and the impact energy at the temperature of minus 20 DEG C ranges from 218 J to 287 J. A plate blank adopts a hot charging mode, the charging temperature is high, the heating time is short, and the energy consumption is low. The steel plate does not need heat treatment and is short in production period and low in cost.

Description

technical field [0001] The invention relates to the field of hot rolling, in particular to a production method of a low-cost high-toughness Q460qNHD steel plate. Background technique [0002] When the road bridge made of ordinary bridge steel is used in the field, the bridge steel is exposed to sunlight, air, water and other media for a long time. The surface of the steel plate corrodes quickly and the service life is short, which can no longer meet the needs of the development of road and railway transportation. Now more and more corrosion-resistant weather-resistant bridge steels are used to make bridges. In the past, the amount of weather-resistant steel with a yield strength of 345MPa was relatively large. With the development of railway and highway construction, bridge construction has also developed rapidly. The strength level of weather-resistant bridge steel is also getting higher and higher, and now the weather-resistant bridge steel with a yield strength of 460MPa ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50B21B1/46C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/48C22C38/46C22C38/50C22C38/42C22C38/002C22C38/06C22C33/04C21D8/0205C21D8/0221B21B1/466C21D2211/005C21D2211/009
Inventor 温利军薛越李浩王国海徐建东杨文海高军
Owner BAOTOU IRON & STEEL GRP
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