Method for manufacturing low-carbon 9Ni steel thick plate

A manufacturing method and post-rolling technology, applied in the field of steel rolling process, can solve the problems of not realizing localization, not finding the patent authorization of 9Ni steel wide and thick plate production technology and material design, etc., so as to shorten the heat treatment process, improve the low temperature toughness and Other mechanical properties, without loss of material effect

Inactive Publication Date: 2008-07-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

5Ni and 9Ni series low-temperature steels have also received attention. The service temperatures of these two steels can reach -170°C and -196°C respectively, but they have not been localized.
[0006] After searching the domestic patent database, 123 technical invention patents related to LNG were found, but no patent authorization for 9Ni steel wide and thick plate production technology and material design required by LNG facilities was found.

Method used

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  • Method for manufacturing low-carbon 9Ni steel thick plate
  • Method for manufacturing low-carbon 9Ni steel thick plate

Examples

Experimental program
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Effect test

example 1

[0026] The design composition of 9Ni steel by weight percentage is: C 0.021%, Si 0.247%, Mn0.62%, S0.002%, P0.01%, Ni8.97%, and the balance is Fe and impurities.

[0027] The production process includes steelmaking, red delivery, hot charging, hot rolling, and on-line heat treatment, specifically:

[0028] Use a 50Kg vacuum induction furnace to make steel, and pour it into a pouring system composed of two refractory molds with an inner cavity of 100×100×170mm. After calming down for 5 minutes, the steel is sent to a heating furnace with a temperature of 1200°C. After the temperature is uniform , Immediately smash the mold and take out the steel ingot for hot rolling. Roll from a thickness of 100mm to a finished product with a thickness of 16mm. Rough rolling is carried out in austenite complete recrystallization rolling. The starting temperature of rolling is controlled at 1090°C, and the finishing temperature of rough rolling is 1050°C. system, the starting rolling temperatu...

example 2

[0033] The design composition of 9Ni steel by weight percentage is: C 0.037%, Si 0.28%, Mn 0.67%, S 0.002%, P 0.01%, Ni 9.01%, and the balance is Fe and impurities.

[0034] The production process includes steelmaking, red delivery, hot charging, hot rolling, and on-line heat treatment, specifically:

[0035] Use a 50Kg vacuum induction furnace to make steel, and pour it into a pouring system composed of two refractory molds with an inner cavity of 100×100×170mm. After calming down for 5 minutes, the steel is sent to a heating furnace with a temperature of 1200°C. After the temperature is uniform , Immediately smash the mold and take out the steel ingot for hot rolling. Roll the rough billet with a thickness of 100mm into a finished product with a thickness of 16mm. Rough rolling is carried out in austenite complete recrystallization rolling. For rolling in the recrystallization zone, the starting rolling temperature is controlled at 760°C, and the final rolling temperature i...

example 3

[0039] The design composition of 9Ni steel by weight percentage is: C 0.025%, Si 0.246%, Mn0.429%, S0.003%, P0.01%, Ni9.3%, and the balance is Fe and impurities.

[0040] The production process includes steelmaking, red delivery, hot charging, hot rolling, and on-line heat treatment, specifically:

[0041] Use a 50Kg vacuum induction furnace to make steel, and pour it into a pouring system composed of two refractory molds with an inner cavity of 100×100×170mm. After calming down for 5 minutes, the steel is sent to a heating furnace with a temperature of 1200°C. After the temperature is uniform , Immediately smash the mold and take out the steel ingot for hot rolling. Roll from a rough billet with a thickness of 100mm to a finished product with a thickness of 16mm. Rough rolling is carried out in austenite complete recrystallization rolling. For rolling in the recrystallization zone, the starting rolling temperature is controlled at 780°C, and the final rolling temperature is ...

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Abstract

The invention relates to a method for preparing a low carbon 9 nickel steel thick plate, the steps are that: steelmaking, the components which are weighted by weight percentages are that carbon is 0.02-0.04 percent, silicon is 0.2-0.3 percent, manganese is 0.4-0.7 percent, sulfur is equal or less than 0.005 percent, phosphorus is equal or less than 0.01 percent, nickel is 8.9-9.5 percent, the allowance is ferrum and impurities, and the components are made into steel. Red charge: molten steel is cast and is stood for 5 minutes and is red charged into a heating furnace. Hot rolling: module ingots are rolled in two stages. On-line heat treatment: when finish rolling temperature is in a dual-phase region, quenching after rolling and tempering heat treatment are used, when the finish rolling temperature is in an austenite region, the quenching after rolling, quenching after solid solution and the tempering heat treatment are used or the quenching after rolling, the quenching after solid solution, dual-phase region quenching and the tempering heat treatment or the quenching after keeping temperature in the dual-phase region for 10-20 minutes are used, and then water-cooling is done after tempering whose temperature is kept for 1 hour in 580 DEG C. The invention has the advantages of short technological process, low producing cost, and high low-temperature flexibility and other mechanical properties of 9 nickel steel.

Description

technical field [0001] The invention relates to a steel rolling process, in particular to a method for preparing low-carbon 9Ni steel thick plates mainly by red feeding, hot charging, low-temperature controlled rolling and on-line heat treatment after rolling. Background technique [0002] With the adjustment of the energy structure, natural gas acts as a clean energy, and its proportion will increase in the future. In order to facilitate transportation and storage, natural gas is generally liquefied into liquefied natural gas (LNG). The terminal of LNG is a tank with a horizontal bottom and a huge storage capacity. The main structural materials of the walls and bottom are 9Ni series low-temperature steel wide and thick plates. are joined together by welding. Therefore, the 9Ni steel thick plate not only needs to have a high strength index, but also needs to have good low-temperature performance in its weld seam and heat-affected zone. In the 35 years since 1970, the low-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C21D8/02C21D9/00
Inventor 刘振宇谢章龙杨哲王国栋
Owner NORTHEASTERN UNIV
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