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

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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

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Example Embodiment

[0019] Example 1:

[0020] A pressure vessel steel 18MnMoNbR, containing the following mass percentages of chemical composition (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, the 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 a 100mm pressure vessel steel 18MnMoNbR thick plate is provided, which includes the following steps:

[0024] a. KR hot metal pretreatment: the molten iron at the station must be stripped of the front slag and the back slag to ensure that the thickness of the slag layer is ≤20mm. After the molten iron is stirred and desulfurized by KR, the molten iron S is ≤0.005%, and the desulfurization cycle is 15min and the temperature drop is 15 ℃;

[0025] b. Converter smelting: molten iron S≤0.003%, P≤0.080%, molten ...

Example Embodiment

[0043] Example 2:

[0044] A pressure vessel steel 18MnMoNbR, containing the following mass percentages of chemical composition (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, the 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 a 100mm pressure vessel steel 18MnMoNbR thick plate is provided, which includes the following steps:

[0048] a. KR hot metal pretreatment: the molten iron at the station must be stripped of the front slag and the back slag to ensure that the thickness of the slag layer is ≤20mm. After the molten iron is stirred and desulfurized by KR, the molten iron S is ≤0.005%. ℃;

[0049] b. Converter smelting: molten iron S≤0.003%, P≤0.080%, molten iron temperature 1290℃, molten iron loading error is controlled by ±1...

Example Embodiment

[0067] Example 3:

[0068] A pressure vessel steel 18MnMoNbR, containing the following mass percentages of chemical composition (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, the 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 a 100mm pressure vessel steel 18MnMoNbR thick plate is provided, which includes the following steps:

[0072] a. KR hot metal pretreatment: the molten iron at the station must be stripped of the front slag and the back slag to ensure that the thickness of the slag layer is ≤20mm. After the molten iron is stirred and desulfurized by KR, the molten iron S is ≤0.005%. ℃;

[0073] b. Converter smelting: molten iron entering the furnace S≤0.003%, P≤0.080%, molten iron temperature 1310℃, molten iron loading error i...

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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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