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A kind of low alloy high temperature resistant pressure vessel steel plate and its production method

A technology for pressure vessels and production methods, which is applied in the field of low-alloy high-temperature resistant pressure vessel steel plates and their production, and can solve problems such as increased production costs, adverse effects of steel plate weldability and impact toughness, etc.

Active Publication Date: 2021-04-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the steel for pressure vessels with high temperature resistance and long-term service at home and abroad is usually manufactured by adding relatively high content of molybdenum, nickel and other elements during steel smelting, through its solid solution and precipitation strengthening and increasing carbon equivalent. Guarantee the high temperature performance of the steel, so that the steel plate can serve for a long time at high temperature, however, adding molybdenum and nickel will greatly increase the production cost, and increasing the carbon equivalent will adversely affect the weldability and impact toughness of the steel plate

Method used

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  • A kind of low alloy high temperature resistant pressure vessel steel plate and its production method
  • A kind of low alloy high temperature resistant pressure vessel steel plate and its production method
  • A kind of low alloy high temperature resistant pressure vessel steel plate and its production method

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Experimental program
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Effect test

Embodiment 1

[0034] In the production method of this embodiment, the molten steel is smelted in a converter, refined outside the furnace, cast into a continuous casting slab (section 300mm), and the finished rolled steel plate has a specification of 20mm. Its composition is shown in Example 1 in Table 1, and the results of rolling process and mechanical properties are shown in Tables 2 and 3, respectively.

[0035] Table 2 Rolling and heat treatment process

[0036]

[0037]

[0038] Table 3 mechanical properties results

[0039]

[0040] The 20mm steel plate in the hot-rolled state and the normalized heat-treated state has good toughness and strength matching, and fully meets the NB / T 47013 flaw detection standard level I requirements.

[0041] Non-metallic inclusions in steel: Class A Class 0, Class B Class 0.5, Class C Class 0, Class D Class 0.

Embodiment 2

[0043] In the production method of this embodiment, the molten steel is smelted in a converter, refined outside the furnace, cast into a continuous casting slab (section 300mm), and rolled into a finished steel plate with a specification of 48mm. Its composition is shown in Example 2 in Table 1, and the results of rolling process and mechanical properties are shown in Tables 4 and 5, respectively.

[0044] Table 4 Rolling and heat treatment process

[0045] billet heating temperature / ℃ Rolling temperature / ℃ Secondary rolling temperature / ℃ Finishing temperature / ℃ Opening and cooling temperature / ℃ Final cooling temperature / ℃ 1245 1085 945 868 829 395

[0046] Table 5 mechanical properties results

[0047]

[0048] The 58mm steel plate in hot-rolled state and normalized heat-treated state has good toughness and strength matching, and fully meets your NB / T 47013 flaw detection standard level I requirements.

[0049] Non-metallic inclusions in ...

Embodiment 3

[0051] In the production method of this embodiment, the molten steel is smelted in a converter, refined outside the furnace, cast into a continuous casting slab (section 300mm), and the rolled finished steel plate has a specification of 72mm. Its composition is shown in Example 3 in Table 1, and the results of rolling process and mechanical properties are shown in Tables 6 and 7, respectively.

[0052] Table 6 Rolling and heat treatment process

[0053] billet heating temperature / ℃ Rolling temperature / ℃ Secondary rolling temperature / ℃ Finishing temperature / ℃ Opening and cooling temperature / ℃ Final cooling temperature / ℃ 1245 1105 955 878 829 415

[0054] Table 7 mechanical properties results

[0055]

[0056] The 72mm steel plate in the hot-rolled state and in different heat-treated states has good toughness and strength matching, and fully meets the requirements of Class I of the NB / T 47013 flaw detection standard.

[0057] Non-metallic in...

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Abstract

The invention discloses a low alloy high temperature resistant pressure vessel steel plate and a production method thereof, C: 0.16-0.19%, Si: 0.25-0.35%, Mn: 1.20-1.50%, P≤0.015%, S≤0.005%, Cr: 0.25-0.35%, Mo: 0.08-0.13%, Al: 0.020-0.035%, Ti: 0.010-0.020%, V: 0.025-0.035%, Nb: 0.015-0.025%, Cu: 0.20-0.30%, and the remaining content is Fe and unavoidable impurities.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a low-alloy high-temperature-resistant pressure vessel steel plate and a production method thereof. Background technique [0002] At present, the steel for pressure vessels with high temperature resistance and long-term service at home and abroad is usually manufactured by adding relatively high content of molybdenum, nickel and other elements during steel smelting, through its solid solution and precipitation strengthening and increasing carbon equivalent. Guarantee the high-temperature performance of the steel grade, so that the steel plate can serve for a long time at high temperature. However, adding molybdenum and nickel will greatly increase the production cost, and increasing the carbon equivalent will adversely affect the weldability and impact toughness of the steel plate. This patent has improved the chemical composition and production proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C21D8/02C21D1/28C21C7/064
CPCC21C7/064C21D1/28C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28
Inventor 欧阳鑫胡昕明王储孙殿东胡海洋王勇张健颜秉宇王爽邢梦楠
Owner ANGANG STEEL CO LTD