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Preparation method of 09MnNiD seamless steel pipe suitable for low temperature

A technology of seamless steel pipe and low temperature, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of poor surface quality of steel pipe, impact energy not meeting the requirements of use, etc., and achieve the effects of short production cycle, energy saving and simplified production process

Active Publication Date: 2022-06-07
DAYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing 09MnNiD seamless steel pipe suitable for low temperature, which is used to solve the problem that the current seamless steel pipe production process is not suitable for producing 09MnNiD with a wall thickness > 8 mm, and the impact energy at -70 ° C does not meet the use requirements , and the problem of poor surface quality of steel pipes

Method used

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  • Preparation method of 09MnNiD seamless steel pipe suitable for low temperature
  • Preparation method of 09MnNiD seamless steel pipe suitable for low temperature
  • Preparation method of 09MnNiD seamless steel pipe suitable for low temperature

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preparation example Construction

[0045] The invention provides a preparation method of a 09MnNiD seamless steel pipe suitable for low temperature, which comprises the operations of hot rolling and normalizing the pipe blank. in,

[0046] Hot rolling includes uniform heating treatment, piercing treatment, and tube rolling treatment of the tube blank;

[0047] The normalization treatment includes the steel pipe cooling treatment, reheat treatment, reduction and sizing treatment, and finishing treatment for the steel pipe after the pipe rolling treatment.

[0048]In a specific embodiment of the present invention, the tube blank is prepared by sequentially subjecting the production raw materials to smelting treatment, refining treatment, vacuum treatment, die casting treatment, ingot heating treatment, round steel rolling treatment, slow cooling treatment and finishing treatment.

[0049] The raw material for production is one or two mixtures of scrap steel and molten iron. The composition of the scrap steel sa...

Embodiment

[0082] The invention provides a preparation method of a 09MnNiD seamless steel pipe suitable for low temperature, which comprises the following steps of hot rolling and normalizing the pipe blank. in,

[0083] The tube blank is prepared by sequentially subjecting the production raw materials to smelting treatment, refining treatment, vacuum treatment, die casting treatment, ingot heating treatment, rolling round steel treatment, slow cooling treatment and finishing treatment.

[0084]The preparation process of the tube blank includes: the raw material for production is scrap steel, which is smelted in an electric furnace to obtain molten molten steel, and the ladle furnace is used to refine the molten molten steel, and the whole process is blown with Ar to stir to obtain the refined molten steel; in the process of blowing Ar, Al is added to the molten steel powder, CaSi powder diffusion deoxidation and calcium treatment; place the refined molten steel in a vacuum furnace for v...

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Abstract

The invention provides a preparation method of a 09MnNiD seamless steel tube suitable for low temperature, which comprises the following steps: carrying out hot rolling and normalizing treatment on a tube blank to obtain a seamless steel tube; the hot rolling comprises the steps of performing uniform heating treatment, perforating treatment and pipe rolling treatment on the pipe blank; the normalizing treatment comprises the steps of performing steel pipe cooling treatment, reheating treatment, reducing and sizing treatment and finishing treatment on the rolled steel pipe. The 09MnNiD seamless steel pipe produced by the preparation method can meet the performance requirement specified by the standard for the performance with the wall thickness larger than 8 mm, and it can be guaranteed that the impact energy requirement KV2 at the temperature of-70 DEG C is larger than or equal to 47 J; the steel pipe surface quality requirement can be met, energy is saved, cost is reduced, and the production requirements of multiple specifications and small quantity are met.

Description

technical field [0001] The invention belongs to the technical field of seamless steel pipe manufacturing, in particular to a preparation method of a 09MnNiD seamless steel pipe suitable for low temperature. Background technique [0002] my country's 0.5%Ni low-temperature steel series has adjusted the chemical composition on the basis of the corresponding steel grades in Germany and France, and improved it to -70 ℃ grade steel, named 09MnNiDR (with R is steel for steel plates, chemical composition requirements of 09MnNiD and 09MnNiDR) Basically the same), it has become one of the main steel grades for low temperature pressure vessels in my country. 09MnNiD steel is added with 0.3% to 0.8% nickel element on the basis of carbon manganese steel, which improves the impact toughness of the steel. Seamless steel pipe is an economical steel material with a circular section, which is widely used in national economic construction. With the rapid development of the domestic economy a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B23/00C21D8/10
CPCB21B23/00C21D8/105C21D2211/005C21D2211/009Y02P10/20
Inventor 黎福华张银桥孔繁革朱志宝曹玉鑫唐科李勇李海松
Owner DAYE SPECIAL STEEL CO LTD
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