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Manufacturing method of large-scale p92 heat-resistant steel forgings

A manufacturing method and technology for steel forgings, which are applied in the field of manufacturing large-size P92 heat-resistant steel forgings, can solve the problems of narrow thermoplastic deformation temperature range, technical difficulty in billet forging process, and unfavorable performance of large forgings, and achieve the effect of improving the effect.

Active Publication Date: 2020-09-25
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the thermoplastic deformation temperature range of P92 steel is relatively narrow, and its billet forging technology is difficult, especially for large-scale P92 steel ingots, defects such as segregation, shrinkage cavity, and porosity will inevitably exist during the casting process, and the larger the shape of the steel ingot , the defects inside the steel ingot are more obvious, and the internal defects of the steel ingot will have a significant adverse effect on the performance of large forgings

Method used

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  • Manufacturing method of large-scale p92 heat-resistant steel forgings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1 adopts the inventive method to manufacture P92 steel forging

[0063] Adopt the method of the present invention to produce The heat-resistant steel P92 includes steps of smelting, homogenization treatment, forging, and annealing heat treatment.

[0064] Obtain steel ingot by above-mentioned smelting step, described steel ingot weight is the octagonal ingot of 19 tons (ingot body opening size Ingot Bottom Mouth Size Ingot body height 2515mm), the chemical composition of this steel ingot is by weight percentage: C 0.11%, Si 0.27%, Mn 0.49%, P 0.009%, S 0.003%, Cr 8.76%, Ni 0.26%, Mo0.44% , V 0.22%, Nb 0.08%, N 0.044%, Al 0.003%, W 1.65%, B 0.003%, and the balance of Fe and unavoidable impurities.

[0065] Homogenization treatment: The steel ingot is sent to the heating furnace (measured temperature 500°C), the steel ingot is heated to 950°C±10°C at a heating rate of 80°C / h, and kept at this temperature for 4 hours; then heated at 80°C The heating rate ...

Embodiment 2

[0069] Embodiment 2 adopts the inventive method to manufacture P92 steel forging

[0070] Adopt the method of the present invention to produce The heat-resistant steel P92 includes steps of smelting, homogenization treatment, forging, and annealing heat treatment.

[0071] Obtain steel ingot by above-mentioned smelting step, described steel ingot weight is the octagonal ingot of 19 tons (ingot body opening size Ingot Bottom Mouth Size Ingot body height 2515mm), the chemical composition of this steel ingot is by weight percentage: C 0.11%, Si 0.27%, Mn 0.49%, P 0.009%, S 0.003%, Cr 8.76%, Ni 0.26%, Mo0.44% , V 0.22%, Nb 0.08%, N 0.044%, Al 0.003%, W 1.65%, B 0.003%, and the balance of Fe and unavoidable impurities.

[0072] Homogenization treatment: The steel ingot is sent to the heating furnace (measured temperature 550°C), and the steel ingot is heated to 950°C±10°C at a heating rate of 70°C / h, and kept at this temperature for 4 hours; then heated at 70°C Heat up to 12...

Embodiment 3

[0076] Embodiment 3 adopts the inventive method to manufacture P92 steel forging

[0077] Adopt the method of the present invention to produce The heat-resistant steel P92 includes steps of smelting, homogenization treatment, forging, and annealing heat treatment.

[0078] Obtain steel ingot by above-mentioned smelting step, described steel ingot weight is the octagonal ingot of 19 tons (ingot body opening size Ingot Bottom Mouth Size Ingot body height 2515mm), the chemical composition of this steel ingot is by weight percentage: C 0.11%, Si 0.27%, Mn 0.49%, P 0.009%, S 0.003%, Cr 8.76%, Ni 0.26%, Mo0.44% , V 0.22%, Nb 0.08%, N 0.044%, Al 0.003%, W 1.65%, B 0.003%, and the balance of Fe and unavoidable impurities.

[0079] Homogenization treatment: the steel ingot is sent to the heating furnace (measured temperature 600°C), the steel ingot is heated to 950°C±10°C at a heating rate of 60°C / h, and kept at this temperature for 4 hours; then heated at 60°C The heating rate ...

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Abstract

The invention relates to a manufacture method for a large-scale P92 heat-resistant steel forged piece, and belongs to the technical field of ferrous metallurgy. Aiming at solving the technical problems, the invention provides the manufacture method for the large-scale P92 heat-resistant steel forged piece to reduce the internal defects of P92 steel forged pieces and improve a flaw detection percent of pass. The manufacture method has the technical scheme of providing a forging technology of the P92 steel ingot and the forging technology comprises the following steps in sequence: homogenizing processing, forging and annealing thermal processing; then, cooling to the room temperature to obtain the P92 steel forged piece. Through the optimized technologies, including homogenizing processing,forging and annealing thermal processing, the P92 heat-resistant alloy forged piece is manufactured, the internal quality and the outer surface quality of the forged piece can be effectively controlled, and the manufacture method is especially suitable for manufacturing the large-scale P92 heat-resistant steel.

Description

technical field [0001] The invention relates to a method for manufacturing large-scale P92 heat-resistant steel forgings, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] P92 steel is a ferritic heat-resistant steel developed by adding W and reducing Mo on the basis of 9Cr1MoVNb steel, and adding a small amount of B element at the same time. ASME SA 335 / SA 335M "Seamless ferritic alloy steel pipe for high temperature" standard specifies the chemical composition of P92 steel as follows: [0003] Chemical composition (mass fraction)% [0004] [0005] P92 steel is a martensitic heat-resistant steel, which has excellent corrosion resistance, oxidation resistance, good high-temperature strength, creep performance, and better thermal fatigue resistance than austenitic stainless steel. Studies have shown that the allowable stress and enduring strength of P92 steel at 600 °C are nearly 20% higher than those of P91 steel. The succe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/54C21D8/00
CPCC21D8/005C22C38/001C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/54
Inventor 涂露寒吴铖川赵中清杜思敏
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD