Method for manufacturing Ni steel moderately-thick plate for low-temperature container

A technology of low temperature container and manufacturing method, which is applied in the field of manufacturing 3.5Ni steel medium and thick plate for low temperature container, can solve the problems of unmentioned low temperature toughness, can not use LEG storage tank, higher than -110 ℃, etc., and can improve the low temperature Toughness and strength, simple heat treatment process, effect of reducing alloy cost

Active Publication Date: 2016-03-30
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] According to the search by the applicant using "low-temperature steel" and "steel for low-temperature vessels", Wugang patent CN101235466 provides "a high-toughness -110°C low-temperature steel and its manufacturing method", and Wugang patent CN103305758A provides "a pressure vessel Steel plates and their production methods", but they all adopt the heat treatment process of normalizing + tempering (NT), and the toughness test temperature is higher than -110 ° C; Shougang patent CN103266267A provides "a kind of 08Ni3DR steel plate for low temperature vessels "Manufacturing method", using the quenching + tempering heat treatment process, but the precious metal Mo is added to the composition, and it only provides low-temperature toughness at -100°C, and there is no mention of low-temperature toughness at -120°C, so it cannot be used to manufacture LEG storage Can

Method used

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  • Method for manufacturing Ni steel moderately-thick plate for low-temperature container
  • Method for manufacturing Ni steel moderately-thick plate for low-temperature container
  • Method for manufacturing Ni steel moderately-thick plate for low-temperature container

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Embodiment 1

[0022] This embodiment provides a method for manufacturing a 3.5Ni steel plate for low-temperature vessels. A steel plate with a thickness of 15 mm is produced by rolling a billet with a thickness of 150 mm in a steel coil rolling mill. Including the following steps:

[0023] The composition of medium and thick plates is as follows: C: 0.055%, Si: 0.21%, Mn: 0.62, S: 0.002%, P: 0.005%, Ni: 3.46%, Alt: 0.031%, and the balance is Fe and Impurities; steelmaking according to the composition and continuous casting into a 150mm thick slab, the continuous casting slab is heated to 1200°C in a heating furnace, and kept for 2 hours; rolling is controlled in two stages, and the rough rolling is in the austenite complete recrystallization zone Rolling, the starting temperature is 1100°C, the finishing temperature of rough rolling is 1050°C, the finish rolling is rolled in the austenite incomplete recrystallization zone, the starting temperature is 900°C, and the finish rolling temperatur...

Embodiment 2

[0025] This embodiment provides a method for manufacturing a 3.5Ni steel plate for low-temperature containers. A steel plate with a thickness specification of 20 mm is produced by rolling a 150 mm thick billet with a steel coil mill. Including the following steps:

[0026] The composition of medium and thick plates is as follows: C: 0.066%, Si: 0.24%, Mn: 0.56%, S: 0.003%, P: 0.005%, Ni: 3.72%, Alt: 0.023%, and the balance is Fe and impurities; steelmaking according to the composition and continuous casting into a 150mm thick slab, the continuous casting slab is heated to 1150°C in a heating furnace, and kept for 2 hours; the rolling is controlled in two stages, and the rough rolling is completely recrystallized in the austenite Zone rolling, start rolling temperature 1050°C, rough rolling finish temperature 1020°C, finish rolling in the austenite incomplete recrystallization zone, start rolling temperature 890°C, finish rolling finish temperature 850°C; a total of eight passe...

Embodiment 3

[0028] This embodiment provides a method for manufacturing a 3.5Ni steel plate for low-temperature containers. A steel plate with a thickness specification of 20 mm is produced by rolling a 150 mm thick billet with a steel coil mill. Including the following steps:

[0029] The composition of medium and thick plates is as follows: C: 0.039%, Si: 0.14%, Mn: 0.83%, S: 0.0009%, P: 0.004%, Ni: 3.37%, Alt: 0.043%, and the balance is Fe and impurities; steelmaking according to the composition and continuous casting into a 150mm thick slab, the continuous casting slab is heated to 1170°C in a heating furnace, and kept for 2 hours; the rolling is controlled in two stages, and the rough rolling is completely recrystallized in the austenite Zone rolling, start rolling temperature is 1060°C, rough rolling finish temperature is 1050°C, finish rolling is rolled in austenite incomplete recrystallization zone, start rolling temperature is 830°C, finish rolling finish temperature is 810°C; a t...

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Abstract

The invention provides a method for manufacturing a Ni steel moderately-thick plate for a low-temperature container. The Ni steel moderately-thick plate comprises, by weight, 0.03-0.07% of C, 0.10-0.25% of Si, 0.50-0.90% of Mn, 0-0.005% of S, 0-0.008% of P, 3.25-3.75% of Ni, 0.02-0.05% of Alt and the balance Fe. The method comprises the steps that a continuous casting billet is heated to 1150-1200 DEG C, two-stage controlled rolling is conducted after heat preservation is conducted for one to two hours, the rough rolling start temperature is 1030-1100 DEG C, and the finish rolling temperature is 800-870 DEG C; laminar cooling is conducted after rolling, and the red return temperature is 630-700 DEG C. A quenching and tempering heat treatment process is adopted; the quenching temperature is 820-870 DEG C, and the heat preservation time is 30-70 minutes; the tempering temperature is 580-620 DEG C, and the heat preservation time is 30-80 minutes; air cooling is conducted after tempering. According to the method, the alloy components are simple; the steel plate has good matching for strength and toughness, is suitable for manufacturing liquefied petroleum gas (LPG) storage tanks and further can replace 5Ni steel for manufacturing storage tanks for liquefied ethylene gas (LEG) and the like.

Description

technical field [0001] The present invention relates to a kind of low temperature steel and its manufacturing method, specifically a kind of manufacturing method of 3.5Ni steel plate for low temperature container Background technique [0002] In recent years, with the increase of my country's energy consumption and the development of the chemical industry, the demand for liquefied petroleum gas, liquefied propane and ethylene is increasing, and the storage, processing and transportation equipment of these raw materials are mainly made of 3.5Ni steel, so 3.5Ni The demand for Ni steel is increasing. [0003] According to the search by the applicant using "low-temperature steel" and "steel for low-temperature vessels", Wugang patent CN101235466 provides "a high-toughness -110°C low-temperature steel and its manufacturing method", and Wugang patent CN103305758A provides "a pressure vessel Steel plates and their production methods", but they all adopt the heat treatment process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C22C38/02C22C38/04C22C38/06C21D8/02B21C37/02
CPCB21C37/02C21D8/02C22C38/02C22C38/04C22C38/06C22C38/08
Inventor 霍松波方磊王猛党振旗谢章龙
Owner NANJING IRON & STEEL CO LTD
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