A production method of low-cost high-toughness q460qnhd steel plate

A steel plate production method and high-toughness technology, applied in metal rolling and other directions, can solve the problem of low toughness and achieve the effects of good toughness, short manufacturing cycle, and high furnace temperature

Active Publication Date: 2022-06-21
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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  • A production method of low-cost high-toughness q460qnhd steel plate
  • A production method of low-cost high-toughness q460qnhd steel plate
  • A 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 heavy plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm, the center segregation of the slab is C2.0, and rolled into a 15mm thick steel plate. The molten steel is treated with RH, the vacuum degree is below 110Pa for 18.5 minutes, the superheat degree during slab casting is 26℃, the continuous casting adopts electromagnetic stirring and light pressing, the electromagnetic stirring frequency is 6.5Hz, and the current is 310A. The pressing positions are 7, 8 and 9, and the pressing amount is 2.6mm, 2.6mm and 2.6mm. After the slab is cast from the casting machine and cut, before entering the heating furnace, the surface is sprayed with water for laminar flow cooling. During laminar cooling, the water flow density on the upper surface of the slab is 185l / (min·m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. Cooldown is 80 seconds. When entering the furnace, the surface...

Embodiment 2

[0038] It is produced by a wide and heavy plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm, the center segregation of the slab is C0.5, and rolled into a 32mm thick steel plate. The molten steel is treated with RH. The time for the vacuum degree to be below 110Pa is 19.5 minutes. The superheat degree during slab casting is 13℃. The continuous casting adopts electromagnetic stirring and light pressing. The electromagnetic stirring frequency is 6.5Hz and the current is 310A. The pressing positions are 7, 8 and 9, and the pressing amount is 2.6mm, 2.6mm and 2.6mm. The slab is cast from the casting machine, and after cutting, the surface is sprayed with water for laminar flow cooling before entering the heating furnace. During laminar cooling, the water flow density on the upper surface of the slab is 188l / (min·m^ 2 ); the ratio of water flow density on the upper and lower surfaces of the slab is 1:2.8. Cooldown is 110 seconds. When entering the f...

Embodiment 3

[0048] It is produced by a wide and heavy plate rolling mill, using a slab with a thickness of 250mm and a width of 2000mm, the center segregation of the slab is C1.0, and rolled into a 22mm thick steel plate. The molten steel is subjected to RH treatment. The time when the vacuum degree is below 110Pa is 19.0 minutes, and the superheat degree during slab casting is 18°C. The continuous casting adopts electromagnetic stirring and light pressing, the electromagnetic stirring frequency is 6.5Hz, and the current is 310A. The pressing positions are 7, 8 and 9, and the pressing amount is 2.6mm, 2.6mm and 2.6mm. After the slab is cast from the casting machine and cut, before entering the heating furnace, the surface is sprayed with water for laminar flow cooling. During laminar cooling, 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 enter...

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Abstract

The invention discloses a production method of a low-cost high-toughness Q460qNHD steel plate. The invention produces a Q460qNHD steel plate with good surface quality and mechanical properties through suitable smelting, continuous casting, heating, controlled rolling, controlled cooling and descaling processes. The strength, plasticity and toughness of the steel plate are good, and the structure is fine ferrite + pearlite. The yield strength of the steel plate is between 498MPa and 546MPa, the tensile strength is between 589MPa and 625MPa, the elongation is between 21% and 26.5%, and the impact energy at -20°C is between 218J and 287J. The slab adopts the hot-charging method, with high furnace temperature, short heating time and low energy consumption. The steel plate does not need heat treatment, the production cycle is short and the cost is low.

Description

technical field [0001] The invention relates to the field of hot rolling, in particular to a method for producing a low-cost and 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. Now more and more anti-corrosion weathering bridge steel is used to make bridges. In the past, the amount of weathering steel with a yield strength of 345MPa was large. With the development of railway and highway construction, bridge construction has also developed rapidly. The strength level of weathering bridge steel is also getting higher and higher, and now the weathering bridge steel with a yield strength of 460MPa is used more and more in bridge construction. Weathering bridge steel requires good toughness to ensure the safety of the bridge during use, but due to corrosion resistance, a certain amount of Cr, Ni, Cu and o...

Claims

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Application Information

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Patent Type & Authority Patents(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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