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Steel 18MnMoNbR for pressure vessel and process for producing 18MnMoNbR steel plate with thickness of 100mm

A pressure vessel and production process technology, applied in the field of pressure vessel steel 18MnMoNbR and its 100mm thick plate production process, can solve the problems of difficult production and high production cost

Active Publication Date: 2013-06-19
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technical solutions have high production cost and great difficulty in production

Method used

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  • Steel 18MnMoNbR for pressure vessel and process for producing 18MnMoNbR steel plate with thickness of 100mm
  • Steel 18MnMoNbR for pressure vessel and process for producing 18MnMoNbR steel plate with thickness of 100mm
  • Steel 18MnMoNbR for pressure vessel and process for producing 18MnMoNbR steel plate with thickness of 100mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A pressure vessel steel 18MnMoNbR, containing the following chemical composition in mass percent (unit, wt%): C: 0.16, Si: 0.25, Mn: 1.35, Mo: 0.5, P≤0.015, S≤0.005, Als: 0.015, Nb : 0.030, Ti: 0.010, others are Fe and residual elements.

[0021] The carbon equivalent of the chemical composition is ≤0.40.

[0022] The pressure vessel steel 18MnMoNbR has 90% tempered bainite and 10% ferrite.

[0023] Further, a production process for producing 100mm pressure vessel steel 18MnMoNbR thick plate is provided, which includes the following steps:

[0024] a. KR molten iron pretreatment: The molten iron at the station must remove the front slag and the rear slag to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. ℃;

[0025] b. Converter smelting: S ≤ 0.003% and P ≤ 0.080% of the molten iron into the furnace, the temperature of the molten iron is 1270°C, the error of the amount of molten iron is controlled by ± 1t, the scrap steel is strictly...

Embodiment 2

[0044] A pressure vessel steel 18MnMoNbR, containing the following chemical composition in mass percent (unit, wt%): C: 0.18, Si: 0.35, Mn: 1.40, Mo: 0.55, P≤0.015, S≤0.005, Als: 0.025, Nb : 0.035, Ti: 0.015, others are Fe and residual elements.

[0045] The carbon equivalent of the chemical composition is ≤0.40.

[0046] The pressure vessel steel 18MnMoNbR has 90% tempered bainite and 10% ferrite.

[0047] Further, a production process for producing 100mm pressure vessel steel 18MnMoNbR thick plate is provided, which includes the following steps:

[0048] a. KR molten iron pretreatment: The molten iron must be removed before and after the slag is removed to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. ℃;

[0049] b. Converter smelting: S ≤ 0.003% and P ≤ 0.080% of the molten iron into the furnace, the temperature of the molten iron is 1290°C, the error of the amount of molten iron is controlled by ±1t, the scrap steel is strictly made o...

Embodiment 3

[0068] A pressure vessel steel 18MnMoNbR, containing the following chemical composition in mass percent (unit, wt%): C: 0.20, Si: 0.45, Mn: 1.45, Mo: 0.6, P≤0.015, S≤0.005, Als: 0.040, Nb : 0.040, Ti: 0.020, others are Fe and residual elements.

[0069] The carbon equivalent of the chemical composition is ≤0.40.

[0070] The pressure vessel steel 18MnMoNbR has 90% tempered bainite and 10% ferrite.

[0071] Further, a production process for producing 100mm pressure vessel steel 18MnMoNbR thick plate is provided, which includes the following steps:

[0072]a. KR molten iron pretreatment: The molten iron at the station must remove the front slag and the rear slag to ensure that the thickness of the slag layer on the liquid surface is ≤20mm. ℃;

[0073] b. Converter smelting: S ≤ 0.003% and P ≤ 0.080% of the molten iron into the furnace, the temperature of the molten iron is 1310°C, the error of the amount of molten iron is controlled by ± 1t, the scrap steel is strictly ma...

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Abstract

The invention discloses steel 18MnMoNbR for a pressure vessel. The steel 18MnMoNbR comprises the following chemical components in percentage by weight (wt%): 0.16-0.20% of C, 0.25-0.45% of Si, 1.35-1.45% of Mn, 0.5-0.6% of Mo, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.015-0.040% of Als, 0.030-0.040% of Nb, 0.010- 0.020% of Ti and the balance of Fe and other residual elements, wherein the carbon equivalent of the chemical components is less than or equal to 0.04. Furthermore, the invention provides a process for producing an steel 18MnMoNbR plate with a thickness of 100mm. Due to the processes of pretreating molten iron by adopting the KR method, smelting by a converter, blowing argon, carrying out LF refining, carrying out VD refining, casting a die, heating, controlling rolling and cooling, cooling a pile and carrying out heat treatment, the content of harmful elements such as P and S which can affect the toughness of the steel 18MnMoNbR plate in steel can be controlled on the basis of guaranteeing the components of the steel 18MnMoNbR. In addition, by strictly controlling the heating cycle of the rolled steel, strictly controlling finishing rolling temperature, the reddening temperature and the cooling speed in the rolling process and cooling the steel-plate pile slowly, all the performance indexes of the steel 18MnMoNbR plate with the thickness of 100mm can meet the standard requirements.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a pressure vessel steel 18MnMoNbR and a production process for a 100mm-thick plate. Background technique [0002] Steel plates for pressure vessels must withstand different pressures and strengths due to the manufactured vessels. Generally, the normal pressure is 31.4MPa or higher; the working temperature is usually between -20°C and 450°C, and sometimes lower than -20°C. According to the working conditions and processing technology of the container, the steel plate for the container must have good cold bending and welding performance; good plasticity and toughness; high temperature short-term strength or long-term strength performance. In order to enable the container to withstand higher pressure and reduce the weight of the structure itself, in addition to high-quality carbon steel, steel plates for pressure vessels are currently mostly made of low-alloy struct...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 李亮杨阳唐郑磊朱成杰袁恒
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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