Low-cost Q550D steel plate and manufacturing method thereof

A manufacturing method and low-cost technology, applied in the field of low-cost Q550D steel plate and its manufacturing, can solve the problems of high alloy cost, unreachable effect of ordinary ACC, high precious metal, etc.

Inactive Publication Date: 2015-04-08
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The patent application number "200710093978.7" named "550MPa yield strength low crack sensitivity steel plate and its manufacturing method" adopts ultra-low carbon design, the C content is not more than 0.04%, which puts forward higher requirements on the smelting level, and the Mo Precious metals such as Ni and Ni are relatively high, and the alloy cost is too high, so it is not suitable for low-cost production; the patent application number "201110027518.0" named "a low-alloy high-strength steel plate with a yield strength of 550MPa and its production method" has a low alloy cost , using the method of TMCP+steel stacking to

Method used

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  • Low-cost Q550D steel plate and manufacturing method thereof
  • Low-cost Q550D steel plate and manufacturing method thereof
  • Low-cost Q550D steel plate and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1280°C, and then 30 tons of scrap steel is added, and 0.15 tons of aluminum is added for deoxidation and alloying using a single slag process, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in the converter, it is refined outside the LF furnace, adding 4.3 tons of ferromanganese, 0.12 tons of ferro-niobium, 0.67 tons of ferrosilicon, 0.84 tons of ferrochrome and 0.03 tons of ferro-boron, and then vacuum degassing in the RH process and adding 0.18 tons of ferro-titanium , the vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the superheat of the molten steel is controlled at 15-50°C; the slab is put into the heati...

Embodiment 2

[0059] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1250°C, and then 40 tons of scrap steel is added, and 0.13 tons of aluminum is added for deoxidation and alloying by using a single slag process. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in a converter, it is refined outside the LF furnace, and 4.1 tons of ferromanganese, 0.1 tons of ferro-niobium, 0.70 tons of ferrosilicon, 0.76 tons of ferrochrome and 0.026 tons of boron are added. Iron, followed by vacuum degassing in the RH process and adding 0.19 tons of ferrotitanium, the vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the superheat of the molten steel is controlled at 15-50°C Put the slab into the heating furnace and heat up to 1200°C (the total reheating time is 263 minutes, ...

Embodiment 3

[0062] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1300°C, and then 40 tons of scrap steel is added, and 0.14 tons of aluminum is added for deoxidation and alloying using the single slag process, and the slag is blocked in tapping, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in the converter, it is refined outside the LF furnace, adding 4.0 tons of ferromanganese, 0.13 tons of ferro-niobium, 0.84 tons of ferrosilicon, 1.05 tons of ferrochrome and 0.022 tons of ferro-boron, and then vacuum degassing in the RH process and adding 0.095 tons of ferro-titanium , the vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the superheat of the molten steel is controlled at...

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Abstract

The invention relates to a low-cost Q550D steel plate and a manufacturing method thereof. The manufacturing method comprises the following steps: smelting molten iron in a converter, heating to 1250-1350 DEG C, adding scrap steel, adding aluminum to perform deoxidizing alloying by a single slag technique, and tapping while skimming, wherein the ladle needs bottom argon blowing operation in the tapping process; and after smelting the molten steel in the converter, refining the molten steel outside the LF (ladle furnace), adding manganese iron, ferroniobium, silicon iron, chromium iron and boron iron, carrying out RH vacuum degassing, adding ferrotitanium, sending the molten steel to a casting machine to carry out continuous casting, heating the prepared plate blank, and carrying out descaling, rough rolling, finish rolling, cooling, thermal straightening, heat treatment, shearing, hardening and tempering, sampling, inspection and finished product warehousing. By adopting the low-carbon component design, proper addition is adopted to enhance the hardenable element, thereby enhancing the steel cleanliness and optimally controlling the heat-treatment hardening and tempering technique to manufacture the low-cost Q550D steel plate.

Description

technical field [0001] The invention relates to the technical field of medium and thick plates, in particular to a low-cost Q550D steel plate and a manufacturing method thereof. Background technique [0002] Low-alloy high-strength steel is widely used in various types of construction machinery. With the development of large-scale, high-efficiency, and lightweight construction machinery and equipment, high-strength construction machinery steel is widely used in construction machinery manufacturing. Steel for construction machinery needs to have high strength, good low temperature toughness, good fatigue resistance, good cold forming performance, good welding performance, etc. With the development of technology, many steel mills can produce Q550D at present, and the competition is fierce. In order to seek market and profit space, the manufacturing cost of Q550D must be reduced. [0003] The patent application number "200710093978.7" named "550MPa yield strength low crack sen...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/32C22C33/06C21D8/02
CPCC21D8/0226C21D8/0247C22C33/06C22C38/02C22C38/04C22C38/18C22C38/26C22C38/28C22C38/32C22C38/38Y02P10/20
Inventor 刘泽田陆斌李浩高军惠鑫王宏盛华国龙王雅彬
Owner INNER MONGOLIA BAOTOU STEEL UNION
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