9Ni low temperature seamless steel pipe with large aperture and production method thereof
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A seamless steel pipe and large-diameter technology, applied in the field of large-diameter 9Ni low-temperature seamless steel pipes, can solve the problems of high welding process requirements and high production costs, and achieve the effect of dense and uniform internal structure, excellent low-temperature performance and crack suppression.
Active Publication Date: 2015-03-11
HENGYANG VALIN STEEL TUBE
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At present, most of the large-diameter 9Ni low-temperature steel pipes used are welded pipes, which are welded with plates. The production of 9Ni low-temperature steel pipes by welding technology requires very high welding technology, and the corresponding production costs are also high.
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[0023] A large-diameter 9Ni low-temperature seamless steel pipe, the composition of which is in mass %, specifically: C: 0.06, Si: 0.25, Mn: 0.070, P: 0.008, S: 0.0029, Al: 0.05, Mo: 0.08, Ni: 9.03, the rest is Fe and unavoidable impurities.
[0024] The large-diameter 9Ni low-temperature seamless steel pipe is produced by the Pilger rolling process, which includes: tube blank blanking → tube blank center punching → annular furnace heating → Mann piercer piercing → Pilger rolling mill tube → 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 detection → manual re-inspection → cleaning, marking, packaging → storage.
[0025] The specific production steps of billet heating, tube rolling and quenching and tempering treatment are as follows:
[0026] A. Billet heating is divided into preheating, heating, and s...
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Abstract
A 9Ni low temperature seamless steel pipe with large aperture and a production method thereof. The seamless steel pipe comprises the components of no more than 0.10 wt.% of C, 0.20-0.32 wt.% of Si, 0.60-0.90 wt.% of Mn, no more than 0.010 wt.% of P, no more than 0.003 wt.% of S, 9.00-9.50 wt.% of Ni, 0.06-0.09 wt.% of Mo, 0.030-0.060 wt.% of Al and the balance of Fe and unavoidable impurities. The seamless steel pipe is produced by a Pilger period rolling process, which includes pipe blanking, punching on pipe blank, annular furnace heating, punching by Mannesmann puncher, pipe rolling by a Pilger rolling mill, Pilger head cutting, heating in a stepping furnace, sizing by a sizing machine, heat treatment, straightening, inside and outside surface treatment, artificial inspection, ultrasonic eddy automatic current combination flaw detection, artificial recheck, cleaning, identifying, packaging and warehousing.
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 9Ni low-temperature seamless steel pipes by using a pilger rolling process. Background technique [0002] 9Ni low-temperature steel is widely used in the storage and transportation of liquefied natural gas due to its excellent mechanical properties and good low-temperature toughness. This grade of seamless steel pipe is used in a low temperature environment with a design temperature of -158~-162°C and a working pressure of 0.5~29N / mm 2 Under the pressure, its working state is high pressure and low temperature, its surface bears compressive stress in its working environment, and huge thermal stress is generated on the inner and outer surfaces. Therefore, the requirements for the performance of 9Ni are very high, and the steel grade of this grade is required to have both good mechanical prope...
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