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Molybdenum alloy steel plate for pressure container and production method thereof

A technology of pressure vessel and alloy steel plate, applied in the field of iron and steel metallurgy, can solve the problems of increasing production cost, alloy cost, increase production cost, etc., and achieve the effects of reducing smelting cost, easy production scheduling, and less addition amount

Inactive Publication Date: 2020-02-28
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the above stringent requirements, steel mills have to increase the content of alloying elements on the basis of the original technical requirements, and this move will inevitably lead to an increase in production costs. How not to increase production costs, especially alloy costs, rolling and heat treatment costs, so that Obtaining steel plates with better intrinsic properties has become a major problem that steel mills urgently need to solve

Method used

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  • Molybdenum alloy steel plate for pressure container and production method thereof
  • Molybdenum alloy steel plate for pressure container and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The thickness of the molybdenum alloy steel plate for the pressure vessel in this embodiment is 80 mm, and it is composed of the following components in weight percentage: C0.22%, Si 0.35%, Mn 0.70%, P 0.006%, S 0.005%, Mo 0.41%, Cr 0.30%, Ni 0.30%, Cu0.10%, V 0.050%, Nb 0.040%, Ti 0.050%, the balance is Fe and unavoidable impurities.

[0018] The steps of the production method of the molybdenum alloy steel plate for the pressure vessel of the present embodiment are as follows:

[0019] (1) Ingot smelting and ingot casting process: Converter or electric furnace is used for initial smelting, and then refined in LF furnace, VD vacuum treatment, transported to the die casting line for casting to obtain steel ingots.

[0020] (2) Rolling process: heat the soaking furnace to 1200°C, and roll after heating for 28 hours. The starting temperature of rolling is 920°C, the reduction rate of each pass is 12%, and the steel plate is air-cooled after complete rolling.

[0021] (3)...

Embodiment 2

[0023] The thickness of the molybdenum alloy steel plate for the pressure vessel in this embodiment is 100 mm, and it is composed of the following components in weight percentage: C0.23%, Si 0.38%, Mn 0.75%, P 0.005%, S 0.005%, Mo 0.45%, Cr 0.32%, Ni 0.33%, Cu0.15%, V 0.045%, Nb 0.038%, Ti 0.048%, the balance is Fe and unavoidable impurities.

[0024] The steps of the production method of the molybdenum alloy steel plate for the pressure vessel of the present embodiment are as follows:

[0025] (1) Ingot smelting and ingot casting process: Converter or electric furnace is used for initial smelting, and then refined in LF furnace, VD vacuum treatment, transported to the die casting line for casting to obtain steel ingots.

[0026] (2) Rolling process: heat the soaking furnace to 1240°C, and roll after heating for 30 hours. The rolling start temperature is 940°C, the reduction rate of each pass is 11%, and the steel plate is air-cooled after complete rolling.

[0027] (3) Heat...

Embodiment 3

[0029] The thickness of the molybdenum alloy steel plate for the pressure vessel in this embodiment is 132 mm, and it is composed of the following components by weight percentage: C0.24%, Si 0.40%, Mn 0.85%, P 0.004%, S 0.004%, Mo 0.52%, Cr 0.33%, Ni 0.35%, Cu0.18%, V 0.040%, Nb 0.035%, Ti 0.045%, and the balance is Fe and unavoidable impurities.

[0030] The steps of the production method of the molybdenum alloy steel plate for the pressure vessel of the present embodiment are as follows:

[0031] (1) Ingot smelting and ingot casting process: Converter or electric furnace is used for initial smelting, and then refined in LF furnace, VD vacuum treatment, transported to the die casting line for casting to obtain steel ingots.

[0032] (2) Rolling process: heat the soaking furnace to 1280°C, and roll after heating for 32 hours. The rolling start temperature is 1100°C, the reduction rate of each pass is 10%, and the steel plate is air-cooled after complete rolling.

[0033] (3)...

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Abstract

The invention discloses a molybdenum alloy steel plate for pressure container and a production method thereof. The steel plate consists of the following components in percentage by weight: 0.22 to 0.26 percent of C, 0.35 to 0.45 percent of Si, 0.70 to 0.98 percent of Mn, less than or equal to 0.006 percent of P, less than or equal to 0.005 percent of S, 0.41 to 0.64 percent of Mo, 0.30 to 0.35 percent of Cr, 0.30 to 0.40 percent of Ni, 0.10 to 0.22 percent of Cu, less than or equal to 0.050 percent of V, less than or equal to 0.040 percent of Nb, less than or equal to 0.050 percent of Ti and the balance of Fe and unavoidable impurities. The production method comprises the processes of smelting, performing die casting, performing steel rolling and performing heat treatment. The steel plateprovided by the invention has high normal-temperature stretching, high-temperature stretching and low-temperature impact properties and excellent comprehensive property and completely meets design andmanufacturing of the steel plate for the pressure container with special requirements.

Description

technical field [0001] The invention relates to a molybdenum alloy steel plate for pressure vessels and a production method thereof, belonging to the technical field of iron and steel metallurgy. Background technique [0002] In order to meet the needs of petrochemical and coal chemical industry market, technology and production development, boilers and pressure vessels are becoming larger, heavier and more complex, and the requirements for their safety are becoming increasingly stringent. In order to cater to this development trend, the Design Institute put forward higher and more stringent technical requirements for the steel plate of the pressure vessel base material, some requirements such as J coefficient, X coefficient, Ceq carbon equivalent, negative temperature impact toughness and 550 ℃ high temperature tensile The performance is even close to or reach the limit level of steel plate. In order to meet the above stringent requirements, steel mills have to increase th...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/42C22C38/02C22C38/04C22C38/46C22C38/48C22C38/50C21D8/02
CPCC21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 李建朝李样兵赵国昌袁锦程吴艳阳龙杰柳付芳牛红星尹卫江侯敬超王东阳顾自有
Owner WUYANG IRON & STEEL
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