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Method for improving radial structure uniformity of martensite heat-resistant steel large-caliber thick-wall pipe

A technology for uniform structure and heat-resistant steel, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as radial structure and performance inhomogeneity, improve radial temperature field, improve uniformity, and eliminate tissue inheritance sexual effect

Active Publication Date: 2018-11-06
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a method for improving the uniformity of the radial structure and performance of the new martensitic heat-resistant steel large-diameter thick-walled pipe, and to solve the problem of the large-diameter thick-walled pipe of the new martensitic heat-resistant steel G115 with a wall thickness of 60-150 mm. The problem of uneven radial organization and performance overcomes the shortcomings of current technology

Method used

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  • Method for improving radial structure uniformity of martensite heat-resistant steel large-caliber thick-wall pipe
  • Method for improving radial structure uniformity of martensite heat-resistant steel large-caliber thick-wall pipe
  • Method for improving radial structure uniformity of martensite heat-resistant steel large-caliber thick-wall pipe

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Embodiment 1

[0038] The main components of the novel martensitic heat-resistant steel (G115) in the embodiment of the present invention are (wt.%): C: 0.080%; Cr: 8.99%; Si: 0.30%; Mn: 0.50%; Co: 3.01%; W: 2.81%; V: 0.21%; Nb: 0.53%; N: 0.008%; B: 0.014%; Cu: 0.8%; Ti: 0.01%; Zr: 0.01%; the balance is Fe.

[0039] The present invention smelts 40 tons of molten steel according to the above-mentioned composition EAF+LF+VD process, casts 3 steel ingots, and selects two of them for vertical hot extrusion. Large-diameter thick-walled heat-resistant steel pipe. One is implemented by the prior art; the other is implemented by the process of the present invention.

[0040] The implementation of the existing technology is as follows: the temperature of the furnace is 550 ° C, and after the penetration is heated to 1080 ° C at 130 ° C / h, the penetration time is 2 hours, and then the temperature is kept for 1 hour, and the water is quickly quenched to room temperature after the furnace; Fire tre...

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Abstract

The invention discloses a method for improving radial structure uniformity of a martensite heat-resistant steel large-caliber thick-wall pipe, and belongs to the technical field of steel and iron materials. The method comprises the following steps that a pipe blank subjected to hot extrusion is adopted, is placed into a furnace, is heated to 930-980 DEG C by taking the heating speed of 100-120 DEGC per hour, then undergoes heat preservation for 1-6 hours, then is cooled to 740 DEG C + / - 10 DEG C, then undergoes heat preservation for 60-100 hours, and then is cooled along with the furnace; thepipe blank obtained through the above step is placed into the furnace, is heated to 980-1000 DEG C by taking the heating speed of 100-120 DEG C per hour, then is heated to 1040-1100 DEG C as soon aspossible, undergoes heat preservation for 1-3 hours after undergoing hardening, and then undergoes air cooling or water quenching to reach the room temperature; then the pipe blank obtained through the last step undergoes the tempering system, wherein the pipe blank is placed into the furnace is heated to the tempering temperature of 780 + / - 10 DEG C by taking the heating speed of 130-150 DEG C per hour, undergoes heat preservation for 3-5 hours, and then undergoes air cooling to reach the room temperature. The method has the advantages that the structure heredity is eliminated, the radial temperature field of the thick-wall pipe is improved, moreover, the grain is refined, and the uniformity of the radial structure and the performance of the thick-wall pipe is greatly improved.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a method for improving the radial structure uniformity of a large-diameter thick-walled pipe of martensitic heat-resistant steel, which improves the radial direction of a large-diameter thick-walled pipe of a new type of martensitic heat-resistant steel with a wall thickness of 60-150 mm. Microstructure uniformity, especially suitable for the manufacture of pipes related to super (super) critical thermal power units with steam parameters of 630-650 °C. Background technique [0002] Improving the steam parameters of thermal power units is the most important measure to improve the thermal efficiency of the unit and realize coal saving and emission reduction. [0003] At present, several large power units in my country are actively preparing to build the world's first 630°C ultra-supercritical coal-fired demonstration power station; at the same time, entrusted by the National E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D8/10C21D9/08C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54
CPCC21D1/18C21D8/105C21D9/085C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54
Inventor 刘正东陈正宗徐松乾包汉生赵海平雷丙旺杨钢
Owner CENT IRON & STEEL RES INST
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