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Large-caliber Gr3 seamless steel tube applied at low temperature and production method thereof

A seamless steel pipe and large-diameter technology, which is applied in metal rolling and other directions, can solve the problems of high manufacturing cost and difficult processing, and achieve the effects of reducing ellipticity, excellent low-temperature performance, and reducing heating temperature

Inactive Publication Date: 2015-03-25
HENGYANG VALIN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the large-diameter Gr3 low-temperature steel pipes used are welded pipes, which are welded with plates or produced by forging processes, which have high manufacturing costs and difficult processing.

Method used

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Experimental program
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Effect test

Embodiment Construction

[0022] A large-diameter Gr3 low-temperature seamless steel pipe, the composition is in mass %, specifically: C: 0.06, Si: 0.30, Mn: 0.48, P: 0.012, S: 0.004, Ni: 3.466, Mo: 0.096, The rest is Fe and unavoidable impurities.

[0023] Through low C content, low S, P content, appropriate ratio of Ni, Mn, Si and other elements, reducing the content of five harmful elements and other measures, the quality of the billet is guaranteed, and the appearance and performance of the finished pipe are fully guaranteed.

[0024] The large-diameter Gr3 low-temperature seamless steel pipe is produced by the Pilger rolling process, which includes: tube blank blanking → tube blank center drilling → annular furnace heating → Mann piercer piercing → Pilger rolling mill → cutting Pilger head → walking furnace heating → sizing machine sizing → heat treatment → straightening → sawing → internal and external surface treatment → manual inspection → ultrasonic eddy current automatic combined flaw detecti...

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Abstract

The invention discloses a large-caliber Gr3 seamless steel tube applied at a low temperature. The large-caliber Gr3 seamless steel tube comprises the following ingredients in percentage by mass: 0.04-0.08 percent of C, 0.29-0.35 percent of Si, 0.45-0.49 percent of Mn, 0.011-0.012 percent of P, 0.0032-0.005 percent of S, 3.45-3.75 percent of Ni, 0.095-0.12 percent of Mo and the balance of Fe and inevitable impurities. The seamless steel tube is produced by adopting a Pilger milling process according to the following steps: blanking a tube blank; perforating the center of tube blank; heating by using an annular furnace; perforating by using a Mannesmann perforator; milling the tube by using a Pilger milling machine; cutting a Pilger head; heating by using a stepping furnace; sizing by using a sizing mill; thermally machining; straightening; cutting by using a saw; machining inner and outer surfaces; inspecting manually; performing automatic combined flaw detection by ultrasonic vortex; re-inspecting manually; and cleaning, identifying, packaging and putting into storage.

Description

technical field [0001] The invention relates to the technical field of production of seamless steel pipes in the metallurgical industry, in particular to the production of large-diameter Gr3 low-temperature seamless steel pipes using a pilger rolling process. Background technique [0002] Gr3 low-temperature steel has excellent mechanical properties and good low-temperature toughness, and is widely used in the storage and transportation of liquid ethylene and other gases in the petroleum and chemical industries. This grade of seamless steel pipe is used in a low-temperature environment with a design temperature of -46 to -101°C and a working pressure of 10 to 32N / mm2. Its working state is high pressure and low temperature, and its inner surface is subjected to With high compressive stress, the inner and outer surfaces have extremely high thermal stress due to the huge temperature difference. Therefore, the performance requirements of Gr3 steel in the petroleum and chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/10B21C37/06B21B19/04
CPCC22C38/08B21B19/04C21D8/105C22C38/02C22C38/04C22C38/12
Inventor 韩福龙范振远张业圣陈绍林赵健明李端正朱智禄王建华
Owner HENGYANG VALIN STEEL TUBE
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