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Manufacturing process of high-pressure regulating valve disc for ultra-supercritical steam turbine

A high-pressure regulating valve, ultra-supercritical technology, applied in the field of forging shaft forgings

Active Publication Date: 2018-03-06
ZHANGJIAGANG HAILU ANNULAR FORGINGS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] The high-pressure control valve is an important part of the ultra-supercritical steam turbine valve group. Now the mechanical properties of the valve disc in the high-pressure control valve at room temperature must meet the following technical requirements: the tensile strength Rm (MPa) is 900-1050, and the yield strength Rp0. 2 (MPa) ≥ 750, elongation A (%) ≥ 12, reduction of area Z (%) ≥ 40, hardness HB is 262-311, V-notch impact energy (J) ≥ 20; but the existing shaft The valve disc made by the forging manufacturing process can not meet the above technical requirements

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  • Manufacturing process of high-pressure regulating valve disc for ultra-supercritical steam turbine

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0017] The manufacturing process of high-pressure regulating valve discs for ultra-supercritical steam turbines, the process steps are as follows: blanking → heating before forging → forging → annealing → rough car descaling → normalizing → isothermal annealing → quenching and tempering heat treatment → finish car processing;

[0018] (1) In blanking: the selected steel material is: martensitic stainless steel X19CrMoNbVN11-1, and its chemical composition requirements are as follows: C: 0.17~0.23%, Si: ≤0.50%, Mn: 0.40~0.90%, P: ≤ 0.020%, S: ≤0.015%, Cr: 10.00~11.50%, Mo: 0.50~0.80%, Ni: 0.20~0.60%, Cu: ≤0.2%, V: 0.10~0.30%, Al: ≤0.020%, Ti : ≤0.020%, Sn: ≤0.020%, Pb: ≤0.005%, N: 0.050~0.10%, H: ≤1.8ppm, O: ≤20ppm; B: 0.008~0.012%; The process of electroslag remelting; the size of the billet obtained by blanking is φ600×675mm;

[0019] ...

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Abstract

The invention discloses a manufacturing process of a high-pressure regulating valve disc for an ultra-supercritical steam turbine. The manufacturing process comprises the following steps: blanking, heating before forging, forging, annealing, oxide skin removal by rough turning, normalizing, isothermal annealing, tempering heat treatment and finish turning processing. The high-pressure regulating valve disc manufactured by the manufacturing process can meet the following technical requirements: the tensile strength Rm (MPa) is 900-1050, the yield strength Rp 0.2 (MPa) is more than or equal to 750, the elongation rate A (percent) is more than or equal to 12, the percentage Z (percent) of area reduction is more than or equal to 40, the hardness HB is 262-311, the impact power (J) of a V-shaped notch is more than or equal to 20, and the average grain size is not thicker than grade 2 regulated in GB / T 6394; a microscopic structure is uniform tempered martensite, the content of delta ferrites in a most serious field of view is less than 5 percent, and the content of average delta ferrites is less than 3 percent; nonmetallic inclusions meet the following requirements: A: the thickness isless than or equal to 1.5, and the fineness is less than or equal 1.5; B: the thickness is less than or equal to 1.5, the fineness is less than or equal 1.5; C: the thickness is less than or equal to1.5, and the fineness is less than or equal 1.5; D: the thickness is less than or equal to 1.5, and the fineness is less than or equal 1.5; the sum of all kinds is less than or equal to 3.5.

Description

technical field [0001] The invention relates to the field of forging shaft forgings, in particular to a manufacturing process of a high-pressure regulating valve disc for an ultra-supercritical steam turbine. Background technique [0002] The high-pressure control valve is an important part of the ultra-supercritical steam turbine valve group. Now the mechanical properties of the valve disc in the high-pressure control valve at room temperature must meet the following technical requirements: the tensile strength Rm (MPa) is 900-1050, and the yield strength Rp0. 2 (MPa) ≥ 750, elongation A (%) ≥ 12, reduction of area Z (%) ≥ 40, hardness HB is 262-311, V-notch impact energy (J) ≥ 20; but the existing shaft The valve discs made by the forging manufacturing process cannot meet the above-mentioned technical requirements. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a manufacturing process for the valve disc of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/46C22C38/06C22C38/50C22C38/60C22C38/54C21D1/26C21D1/28C21D1/25C21D9/00C21D8/00B21K1/20B21J1/06
CPCB21J1/06B21K1/20C21D1/25C21D1/26C21D1/28C21D8/005C21D9/0068C21D2211/005C21D2211/008C22C38/001C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C38/54C22C38/60
Inventor 万明珍张斌陈磊范禹张丽萍马苏
Owner ZHANGJIAGANG HAILU ANNULAR FORGINGS
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