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15MnNiDR low alloy steel plate for low temperature pressure vessel and production method thereof

A technology of pressure vessel and alloy steel plate, applied in the field of steel manufacturing, can solve the problems of difficult metallurgical process, influence, dependence on imported steel plate, etc.

Active Publication Date: 2012-04-18
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty in the alloy design and metallurgical process of 15MnNiDR steel plate, the current domestic production is far from meeting the market demand, and most of them rely on imported steel plates, which has a great impact on my country's economy

Method used

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  • 15MnNiDR low alloy steel plate for low temperature pressure vessel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]The low-temperature pressure vessel is made of 15MnNiDR low-alloy steel plate with a width of 3800 mm and a thickness of 16 mm, and is manufactured with the following chemical components in mass percentage: C: 0.06 wt%, Si: 0.17 wt%, Mn: 1.15 wt%, P: 0.015 wt% , S: 0.005 wt%, Ni: 0.25 wt%, V or / and Nb or / and Ti: 0.12 wt%, Als: 0.015 wt%, and the rest is Fe. Its production method is carried out according to the following steps:

[0033] 1) Perform KR pretreatment on the high-quality molten iron smelted in the open hearth furnace: when the molten iron arrives at the station, the slag before and after the slag must be removed. Lowering 20°C, the desulfurized molten iron contains 0.005 wt% S in mass percentage.

[0034] 2) Converter smelting: the pretreated molten iron is introduced into a 100 / 120 ton top-bottom combined blowing converter, the S content in the molten iron entering the furnace is 0.005 wt%, the P content is 0.080 wt%, and the temperature of the molten iron ...

Embodiment 2

[0043] The low-temperature pressure vessel is made of 15MnNiDR low-alloy steel plate with a width of 3800mm and a thickness of 40mm, and is manufactured with the following chemical components in mass percentage: C: 0.10wt%, Si: 0.24wt%, Mn: 1.30wt%, P: ≤0.012wt %, S: ≤0.004wt%, Ni: 0.37wt%, V or / and Nb or / and Ti: 0.10wt%, Als: 0.030wt%, and the rest is Fe.

[0044] The production method is basically the same as that in Example 1, the only difference being that in step 1), the thickness of the slag layer on the molten iron surface is 15mm, the desulfurization cycle is 18min, the desulfurization temperature drop is 18°C, and the molten iron after desulfurization contains S 0.004 wt%; in step 2), the S content in the molten iron entering the furnace is 0.004 wt%, the P content is 0.070 wt%, the temperature of the molten iron is 1300°C, and the process gun position is 1.15m in the early stage and 1.4m in the middle stage. m, 1.05m control in the later stage, slagging basicity R is...

Embodiment 3

[0046] The low-temperature pressure vessel is made of 15MnNiDR low-alloy steel plate with a width of 3800mm and a thickness of 60mm, and is manufactured with the following chemical components in mass percentage: C: 0.14 wt%, Si: 0.30 wt%, Mn: 1.45 wt%, P: 0.008 wt% , S: 0.003 wt%, Ni: 0.50 wt%, V or / and Nb or / and Ti: 0.08 wt%, Als: 0.050 wt%, and the rest is Fe.

[0047] The production method is basically the same as that in Example 1, the only difference being that in step 1), the thickness of the slag layer on the molten iron surface is 12mm, the desulfurization cycle is 16min, the desulfurization temperature drop is 14°C, and the molten iron after desulfurization contains S 0.002 wt%; in step 2), a 100 / 120-ton top-bottom double-blown converter is used, the S content in the molten iron entering the furnace is 0.003 wt%, the P content is 0.060 wt%, and the temperature of the molten iron is 1350°C , the loading error of molten iron is controlled within ±1t, the process gun pos...

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Abstract

The invention discloses a 15MnNiDR low alloy steel plate for a low temperature pressure vessel. According to the invention, the 15MnNiDR low alloy steel plate is prepared by smelting and rolling nine alloy elements of Fe, C, Si, Mn, Ni, V, Nb, Ti and Als; through reasonable and strict control of the production processes of KR molten iron pretreatment, converter smelting, LF furnace refining, vacuum degassing treatment, continuous casting, heating, rolling, ACC laminar cooling, normalizing and the like, large scale industrial production of medium and heavy plates used for low temperature pressure vessels is realized, and all the performance of the medium and heavy plates reaches JB / T47030 standard, according with demands for low alloy steel plates in development of the industry of low temperature pressure vessels in China.

Description

[0001] technical field [0002] The invention belongs to the technical field of steel manufacturing, and in particular relates to a 15MnNiDR low-alloy steel plate for low-temperature pressure vessels and a production method thereof. Background technique [0003] Low-alloy high-strength wide-thick steel plate is a product clearly stated in the iron and steel industry development policy to encourage production. It is a resource-saving steel product, and it is also a typical high-tech and high value-added product. It is widely used in various important fields of the national economy such as energy, transportation, construction, and engineering machinery, and has great market potential. With the technological upgrading of the steel demand industry, new and higher requirements are constantly put forward for the performance of steel. Wide and thick steel plates are a leading product belonging to medium and heavy plates in the steel product category, generally referring to steel p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/08C21C1/02C21C5/35C21C7/10C21C7/072B22D11/18B22D11/115C21D1/28B21B37/74
Inventor 朱书成袁永旗许少普张立新崔冠军高照海李忠波于飒李亮亮刘庆波赵迪贾涛张强
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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