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q690d medium-thick steel plate and production method for reducing energy consumption of q690d medium-thick steel plate

A production method and thick steel plate technology, applied in the field of metal processing, can solve problems such as adverse effects on mechanical properties and coarse grains, and achieve the effects of easy promotion, excellent mechanical properties, and reduced production energy consumption

Active Publication Date: 2018-12-21
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the slab is directly hot-charged and delivered, the grains of the slab are relatively coarse when it enters the furnace, which has an adverse effect on the mechanical properties. How to ensure that the mechanical properties of the steel plate remain unchanged, this method does not involve

Method used

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  • q690d medium-thick steel plate and production method for reducing energy consumption of q690d medium-thick steel plate
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  • q690d medium-thick steel plate and production method for reducing energy consumption of q690d medium-thick steel plate

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Use a slab with a thickness of 300mm and roll it into a thick steel plate with a thickness of 40mm. The temperature of the slab out of the furnace is 1220°C, and the heating time of the slab is 240 minutes. The slab is cast from the casting machine. The surface is sprayed with water for laminar cooling. During laminar cooling, the water flow density on the upper surface of the slab is 150l / (min m^2), the ratio of the water flow density on the upper and lower surfaces of the slab is 1:3, and the cooling time is 100 Second. When entering the furnace, the surface turns red and the temperature is 720°C. The (weight percent) chemical composition of the slab is: C 0.12%, Si 0.25%, Mn 1.65%, Nb: 0.04%; V: 0.06%; Cr0.25%; Mo0.25%; P0.02%, S 0.007 %, Als0.017%, Ca0.001%, Ti0.01%; the balance is Fe and unavoidable impurities. The rolling temperature of the first stage is 1210°C. The first-stage rolling speed is 0.8m / s, the first-stage final rolling temperature is 1120°C, and t...

Embodiment 2

[0041] A slab with a thickness of 300mm is used to roll it into a thick steel plate with a thickness of 60mm. The temperature of the slab out of the furnace is 1240°C, and the heating time of the slab is 300 minutes. The slab is cast from the casting machine. The surface is sprayed with water for laminar cooling. During laminar cooling, the water flow density on the upper surface of the slab is 165l / (min m^2), the ratio of the water flow density on the upper and lower surfaces of the slab is 1:3, and the cooling time is 150 Second. When entering the furnace, the surface turns red and the temperature is 670°C. The (weight percent) chemical composition of the slab is: C 0.14%, Si 0.35%, Mn 1.75%, Nb: 0.05%; V: 0.08%; Cr0.35%; Mo0.35%; P0.012%, S 0.03 %, Als0.027%, Ca0.0015%, Ti0.02%; the balance is Fe and unavoidable impurities. The rolling temperature of the first stage is 1210°C. The first-stage rolling speed is 0.8m / s, the first-stage final rolling temperature is 1158°C, a...

Embodiment 3

[0045] Use a slab with a thickness of 300mm and roll it into a thick steel plate with a thickness of 50mm. The temperature of the slab out of the furnace is 1232°C, and the heating time of the slab is 285 minutes. The slab is cast from the casting machine. The surface is sprayed with water for laminar cooling. During laminar cooling, the water flow density on the upper surface of the slab is 167l / (min m^2), the ratio of the water flow density on the upper and lower surfaces of the slab is 1:3, and the cooling time is 120 Second. When it enters the furnace, the surface turns red and the temperature is 689°C. The (weight percent) chemical composition of the slab is: C 0.13%, Si 0.3%, Mn 1.71%, Nb: 0.045%; V: 0.065%; Cr0.3%; Mo0.3%; P0.013%, S 0.003 %, Als0.022%, Ca0.0012%, Ti0.014%; the balance is Fe and unavoidable impurities. The rolling temperature of the first stage is 1222°C. The rolling speed in the first stage is 0.8m / s, the final rolling temperature in the first stage...

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Abstract

The invention provides a Q690D medium steel plate and a production method for reducing energy consumption of the Q690D medium steel plate. The steel plate is prepared from chemical components in percentage by weight as follows: 0.12%-0.14% of C, 0.25%-0.35% of Si, 1.65%-1.75% of Mn, 0.04%-0.05% of Nb, 0.06%-0.08% of V, 0.25%-0.35% of Cr, 0.25%-0.35% of Mo, less than or equal to 0.02% of P, less than or equal to 0.007% of S, 0.017%-0.027% of Als, 0.001%-0.0015% of Ca, 0.01%-0.02% of Ti and the balance of Fe and inevitable impurities. With the production method, production procedures are simplified, the production cost is reduced, the method is simple, easy to implement and convenient to popularize, and the produced Q690D steel type medium steel plate is good in surface quality and excellent in mechanical property.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a Q690D medium-thick steel plate and a production method for reducing energy consumption of the Q690D medium-thick steel plate. Background technique [0002] Q690D is a structural steel with a yield strength of 690MPa. This type of steel is widely used in the fields of construction and engineering machinery. In addition to high strength, good impact toughness and welding performance, Q690D steel plate also requires good surface quality. The medium-thick steel plate of Q690D steel is generally produced by controlled rolling + controlled cooling + heat treatment process, during which the steel plate has to be heated and cooled many times, which consumes a lot of energy, and its energy consumption accounts for most of the manufacturing cost, so its production is reduced. Energy consumption can reduce manufacturing costs and increase economic benefits. In the composition of energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/26C22C38/24C22C38/22C22C38/28C22C38/02C22C38/06B22D11/22C21D8/02C21D1/18
CPCB22D11/225C21D1/18C21D8/0226C21D8/0263C22C38/02C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 温利军薛越张大治李文彪徐建东赵超张满全戴鑫吕雪峰田君高军
Owner INNER MONGOLIA BAOTOU STEEL UNION
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