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Carbon steel plate for seal head of middle and low temperature pressure vessel and manufacture method thereof

A technology for pressure vessels and manufacturing methods, which is applied in the field of steel plate manufacturing, can solve problems such as performance deterioration and coarse grains, and achieve the effects of good mechanical properties, low surface Brinell hardness, and low carbon equivalent

Inactive Publication Date: 2019-08-30
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the forming temperature is much higher than the normalizing temperature of the steel plate, coarse grains will appear after the head is formed, which will eventually lead to performance deterioration

Method used

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  • Carbon steel plate for seal head of middle and low temperature pressure vessel and manufacture method thereof
  • Carbon steel plate for seal head of middle and low temperature pressure vessel and manufacture method thereof
  • Carbon steel plate for seal head of middle and low temperature pressure vessel and manufacture method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] The thickness of the steel plate in this embodiment is 10mm, and its chemical composition is calculated by weight percentage: its chemical composition is calculated by weight percentage: C: 0.17%, Si: 0.36%, Mn: 1.25%, P: 0.006%, S: 0.001 %, Al: 0.035%, Nb: 0.018%, Ti: 0.012%, Ni: 0.22%, Cu: 0.20%, Ni / Cu; 1.1, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq: 0.424% , the manufacturing process of the steel plate is as follows:

[0031] The continuous casting slab with a section of 150mm is used as the billet. The main production process includes smelting process, heating process and rolling process. The rolling process adopts the normalizing rolling process. The specific operation of the main process is as follows:

[0032] 1) Smelting process

[0033] Smelting raw materials are sequentially subjected to KR molten iron pretreatment, converter smelting, LF refining, RH vacuum degassing treatment and slab continuous casting process. Slagging tr...

Embodiment 2

[0040] The thickness of the steel plate in this embodiment is 25mm, and its chemical composition is calculated by weight percentage: its chemical composition is calculated by weight percentage: C: 0.16%, Si: 0.36%, Mn: 1.28%, P: 0.007%, S: 0.001 %, Al: 0.030%, Nb: 0.016%, Ti: 0.015%, Ni: 0.26%, Cu: 0.22%, Ni / Cu; 1.18, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq: 0.425% , the manufacturing process of the steel plate is as follows:

[0041] The continuous casting slab with a section of 150mm is used as the billet. The main production process includes smelting process, heating process and rolling process. The rolling process adopts the normalizing rolling process. The specific operation of the main process is as follows:

[0042] 3) Smelting process

[0043] Smelting raw materials are sequentially subjected to KR molten iron pretreatment, converter smelting, LF refining, RH vacuum degassing treatment and slab continuous casting process. Slagging t...

Embodiment 3

[0050] The thickness of the steel plate in this embodiment is 40mm, and its chemical composition is calculated by weight percentage: its chemical composition is calculated by weight percentage: C: 0.17%, Si: 0.36%, Mn: 1.24%, P: 0.007%, S: 0.001 %, Al: 0.036%, Nb: 0.016%, Ti: 0.015%, Ni: 0.25%, Cu: 0.20%, Ni / Cu; 1.25, the balance is Fe and unavoidable impurity elements, carbon equivalent Ceq: 0.427% , the manufacturing process of the steel plate is as follows:

[0051] The continuous casting slab with a section of 150mm is used as the billet. The main production process includes smelting process, heating process and rolling process. The rolling process adopts the normalizing rolling process. The specific operation of the main process is as follows:

[0052] 5) Smelting process

[0053] Smelting raw materials are sequentially subjected to KR molten iron pretreatment, converter smelting, LF refining, RH vacuum degassing treatment and slab continuous casting process. Slagging t...

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Abstract

The invention relates to a carbon steel plate for a seal head of a middle and low temperature pressure vessel. The carbon steel plate for the seal head of the middle and low temperature pressure vessel contains chemical components by weight percentage: 0.14-0.18% of C, 0.25-0.45% of Si, 1.10-1.30% of Mn, P<=0.010%, S<=0.003%, 0.02-0.05% of Al, 0.010-0.050% of Nb, 0.010-0.030% of Ti, 0.15-0.35% ofNi, 0.10-0.30% of Cu, and the balance Fe and unavoidable impurity elements, wherein the weight percentage ratio of Ni and Cu is not less than 1, carbon equivalent Ceq is not bigger than 0.43%, and thecomputational formula of the carbon equivalent is as following: Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. A delivery state of the carbon steel plate is a normalizing rolling state, and the product is good in internal quality, and low in carbon equivalent and surface Brinell hardness. After simulated thermal forming, simulated normalization and simulated post-welding heat treatment are sequentially performed on a rough specimen, the rough specimen still has excellent mechanical performance, and can completely meet development needs of petrochemical industry.

Description

technical field [0001] The invention belongs to the field of steel plate manufacturing, and in particular relates to a carbon steel plate with a thickness of 10-40mm for medium and low temperature pressure vessel heads and a manufacturing method thereof. Background technique [0002] The head is the end cap on the pressure vessel, and it is also a main pressure-bearing part. There are usually three types of forming processes: cold forming, warm forming and thermoforming. Thermoforming is the mainstream process of head manufacturing at present. The main processes include hot stamping, heat treatment for recovery performance, intermediate stress relief treatment and overall post-weld heat treatment of the final product. In order to facilitate thermoforming processing of the head, the forming temperature range is usually 920-960°C. Since the forming temperature is much higher than the normalizing temperature of the steel plate, the grains of the head will be coarse after formi...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16B21B37/74C21D8/02C22C33/04
CPCB21B37/74C21D8/0226C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 刘海宽钱刚高助忠李经涛苗丕峰张建徐伟恽鹏程
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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