Method for preparing high alloy steel seamless steel pipe

Abstract

The invention discloses a method for preparing a high alloy steel seamless steel pipe, aiming to provide a method which adopts high alloy steel with special components to prepare a seamless steel pipe which has strong intensity, high toughness, high temperature resistance performance and corrosion resistance performance and satisfies the needs of industries such as electric power industry, petrochemical industry and the like. Molten steel used for manufacturing the high alloy steel seamless steel pipe is obtained by proportioning and smelting and comprises the following components by weight percent: 0.08-0.12 percent of C, 0.20-0.50 percent of Si, 0.30-0.60 percent of Mn, 5.0-7.5 percent of Cr, 0.85-1.05 percent of Mo, 0.005-0.040 percent of Al, below 0.40 percent of Ni, 0.05-0.20 percentof Cu, 0.18-0.25 percent of V, 0.10-0.15 percent of Ti, 0.06-0.10 percent of Nb, 0.03-0.07 percent of N, less than 0.0015 percent of Ca, less than 0.020 percent of P, less than 0.003 percent of S andthe balance of Fe. After continuous casting and rolling, a heat processing technology of normalizing and tempering is adopted, sizing and thermal straightening are carried out, and finally flaw detection is carried out to obtain the high alloy steel seamless steel pipe.

Description

technical field [0001] The invention relates to a method for manufacturing a high-alloy steel seamless steel pipe. Background technique [0002] High-alloy steel seamless steel pipes are mainly used in various large-scale power station boilers and gas turbine boilers and superheaters, petroleum cracking units, large-scale coal liquefaction units, etc. In the construction of large-scale coal liquefaction devices, etc., the temperature, pressure and corrosive environment of seamless steel pipes are deteriorating continuously. Corresponding changes have taken place accordingly, aggravating the damage and failure of seamless steel pipes, and the damage and failure of seamless steel pipes can easily lead to equipment failures or accidents, which seriously threatens the safe production of enterprises and even leads to major casualties. Therefore, enterprises have put forward higher requirements for the performance of seamless steel pipes, requiring seamless steel pipes to have hi...

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Problems solved by technology

[0002] High-alloy steel seamless steel pipes are mainly used in various large-scale power station boilers and gas turbine boilers and superheaters, petroleum cracking units, large-scale coal liquefaction units, etc. In the construction of large-scale coal liquefaction devices, etc., the temperature, pressure and corrosive environment of seamless steel pipes are deteriorating continuously. Corresponding changes have taken place accordingly, which intensifies the damage and failure of seamless steel pipes, and the damage and failure of seamless steel pipes can easily lead to equipment failures or accidents, which seriously threatens the safe production of enterprises and even leads to major casualties.

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