Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof

Abstract

The invention provides a hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and a production method thereof. The steel pipe comprises the components by weight percentage of 0.08-0.12% of C, 0.20-0.50% of Si, 0.30-0.60% of Mn, 0-0.020% of P, 0-0.010% of S, 0-0.40% of Ni, 8.00-9.50% of Cr, 0.85-1.05% of Mo, 0-0.20% of Cu, 0-0.015% of Al, 0.18-0.25% of V, 0.06-0.10% of Nb, 0.030-0.070% of N and the balance of Fe. Simultaneously, the invention also provides the production method for producing the hot-rolling seamless steel pipe. The steelpipe and the production method have the effects that the performance of the steel pipe completely meets the requirement of ASME SA-335M standard on the tension and hardness and meets the requirement of GB5310 on impacting and duration strength, the steel pipe has excellent high-temperature performance, is applicable to the high-temperature bearing parts such as a steam pipeline, a connecting box and the like, which are used for high-temperature and high-pressure corrosive environment; and the duration strength under the temperature of 590 DEG C is 112MPa and the duration strength under the temperature of 620 DEG C is 81.4MPa.

Description

technical field [0001] The invention relates to heat-resistant, corrosion-resistant, high-pressure resistant P91 steel pipes and production methods for steam pipes, headers, etc. used in boilers, chemical industry, energy and other equipment, especially for high temperatures of 580-620 ° C, 24-30 MPa A high-pressure hot-rolled seamless steel pipe and a production method thereof. Background technique [0002] As the rapid development of science and technology has brought negative impacts such as environmental pollution, people have gradually realized this serious problem and began to invest a lot of energy and financial resources in environmental improvement. [0003] As an indispensable energy source for people's daily life, electricity is also the blood of industrial development, so the demand is quite large. At present, the world's power generation mainly depends on coal, and the combustion of coal will produce a large amount of CO 2 and SO 2 and other harmful gases, se...

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Problems solved by technology

[0005] At present, the high-temperature and high-pressure P91 required by domestic boiler manufacturers is mainly supplied from abroad, but foreign manufacturers often use periodic rolling tubes and other methods, which not only has low production efficiency, but also cannot guarantee that the rolling ratio is greater than 3, which has a great impact on product quality. At the same time, the supply period is long and the price is expensive, which seriously restricts the development of my country's electric power industry, thus affecting the speed of my country's economic development; domestic steel pipes are produced by forging and boring, although it can ensure the removal of defects in the core of the tube , but the yield of this method is quite low, so it is only suitable for the production of thick-walled steel pipes. At the same time, because there is no rolling deformation, the internal defects of the pipe body cannot be eliminated, the quality of the steel pipe cannot be guaranteed, and the durable strength often does not meet the standard requirements. Serious restricted its development

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