Low-yield-ratio high-toughness high-manganese steel plate and production method thereof

A technology with low yield ratio and production method, which is applied in the field of metallurgy, can solve the problems of high resource consumption pressure and high production cost, and achieve the effect of reducing raw material cost, good comprehensive performance and welding performance, and high strength level

Inactive Publication Date: 2018-01-23
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nickel steel needs a lot of precious nickel resources for alloying in the process of production and manufacturing, so the pressure of resource consumption is high, and the corresponding production cost remains high

Method used

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  • Low-yield-ratio high-toughness high-manganese steel plate and production method thereof
  • Low-yield-ratio high-toughness high-manganese steel plate and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In this embodiment, the thickness of the high-manganese steel plate with low yield ratio and high toughness is 12 mm. The chemical composition and mass percentage of the steel plate are shown in Table 1.

[0035]The production method of the low-yield-ratio high-toughness high-manganese steel plate in this embodiment includes steelmaking, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0036] (1) Steelmaking process: molten steel is first smelted in the primary smelting furnace, using increased slag volume and multiple slag flows, and the tapping temperature is 1625°C; after slag removal, it is refined in an LF furnace to complete the alloying of Mn, Cr, and Nb. When the bag temperature is 1550°C, vacuum treatment is carried out in the VD furnace of the hanging bag; during the vacuum treatment process of the VD furnace, aluminum wire and Si-Ca wire are fed into the molten steel, the vacuum degree is 66Pa ...

Embodiment 2

[0045] In this embodiment, the thickness of the high manganese steel plate with low yield ratio and high toughness is 25 mm. The chemical composition and mass percentage of the steel plate are shown in Table 1.

[0046] The production method of the low-yield-ratio high-toughness high-manganese steel plate in this embodiment includes steelmaking, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0047] (1) Steelmaking process: molten steel is first smelted in the primary smelting furnace, using increased slag volume and multiple slag flows, and the tapping temperature is 1630°C; after slag removal, it is refined in an LF furnace to complete the alloying of Mn, Cr, and Nb. When the bag temperature is 1545 ℃, the hanging bag is vacuum treated in VD furnace; during the vacuum treatment process of VD furnace, aluminum wire and Si-Ca wire are fed into molten steel, the vacuum degree is 66Pa during vacuum treatment, and...

Embodiment 3

[0056] In this embodiment, the thickness of the high manganese steel plate with low yield ratio and high toughness is 30 mm. The chemical composition and mass percentage of the steel plate are shown in Table 1.

[0057] The production method of the low-yield-ratio high-toughness high-manganese steel plate in this embodiment includes steelmaking, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0058] (1) Steelmaking process: molten steel is first smelted in the primary smelting furnace, using increased slag volume and multiple slag flows, and the tapping temperature is 1630°C; after slag removal, it is refined in an LF furnace to complete the alloying of Mn, Cr, and Nb. When the bag temperature is 1545 ℃, the hanging bag is vacuum treated in VD furnace; during the vacuum treatment process of VD furnace, aluminum wire and Si-Ca wire are fed into molten steel, the vacuum degree is 66Pa during vacuum treatment, and...

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Abstract

The invention discloses a low-yield-ratio high-toughness high-manganese steel plate and a production method of the low-yield-ratio high-toughness high-manganese steel plate. The steel plate comprises,by mass percentage, 0.30-0.40% of C, 0.20-0.40% of Si, 23.50-25.50% of Mn, 3.0-4.0% of Cr, 0.020-0.040% of Al, 0.020-0.040% of Nb, not larger than 0.008% of P, not larger than 0.003% of S and balanceFe and inevitable impurities. The production method of the steel plate comprises steelmaking, continuous casting, heating, rolling and heat treatment processes. According to the low-yield-ratio high-toughness high-manganese steel plate and the production method, the design of the chemical compositions is characterized in that solid solution strengthening is conducted on C, Mn and Cr, and the steel plate has the beneficial effects of being high in density, high in strength level, high in elongation, low in yield ratio, excellent in low-temperature impact toughness and the like, is capable of meeting the requirement of the low-yield-ratio high-toughness high-manganese steel plate, has the good comprehensive performance and welding performance and is low in cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-yield ratio high-toughness high-manganese steel plate and a production method thereof. Background technique [0002] At present, low-temperature steel plates and ultra-low temperature steel plates for pressure vessels are mostly nickel steel, which are delivered in a normalized or normalized + tempered or quenched and tempered state, such as 3.5Ni, 5Ni or 9Ni steel. Nickel is the main alloying element in the steel. Fired or normalized + tempered or quenched and tempered state delivery. Nickel steel requires a large amount of precious nickel resources for alloying in the manufacturing process, so the resource consumption pressure is high, and the corresponding production cost remains high. Therefore, there is an urgent need to develop a new type of steel plate material for ultra-low temperature environments. The steel plate should have good low-temperature im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C22C38/02C22C38/06C22C38/26C21D8/02
Inventor 莫德敏邓建军赵文忠李杰赵燕青龙杰庞辉勇王通李博斌杨现亮郭维超王卓李程
Owner WUYANG IRON & STEEL
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