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Manufacturing method of valve forged piece for ultra-supercritical turbine and valve forged piece

An ultra-supercritical and steam turbine technology, which is applied to mechanical equipment, engine components, valve devices, etc., can solve the problems of high waste rate, coarse grain, and affecting high-end steam turbines, and achieve the effect of improving the yield

Inactive Publication Date: 2017-03-08
SHANGHAI TENGHUI FORGING +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 4. The production reject rate is high, because the above key technical points have not been fully grasped by Chinese enterprises, resulting in technical defects such as invalid boron in the FB2 forging, coarse grains, Y-shaped cracks in the center of the forging, substandard hardenability, and unqualified mechanical properties.
[0011] This manufacturing technology has been monopolized by foreign companies and can only rely on foreign imports, which has seriously affected the development of my country's high-end steam turbine industry and the process of localization. This invention develops a manufacturing method for FB2 forgings of 625 ℃ ultra-supercritical steam turbine valves

Method used

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  • Manufacturing method of valve forged piece for ultra-supercritical turbine and valve forged piece
  • Manufacturing method of valve forged piece for ultra-supercritical turbine and valve forged piece
  • Manufacturing method of valve forged piece for ultra-supercritical turbine and valve forged piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The preparation method of the FB2 valve seat forging specifically includes the following steps:

[0078] (1) Melting steps:

[0079] In this step, the 13Cr9Mo2Co1NiVNbB steel ingot is made into a valve forging billet by successively adopting an electric arc furnace melting step, an external refining step, and an electroslag remelting step; wherein the electric arc furnace melting step is as follows:

[0080] 1) Ingredients: S, P≤0.030% high-quality steel scrap and pure Cr, Mo, Co, N, V, Nb, B alloy materials;

[0081] 2) Melting period:

[0082] Before starting the furnace, add 1-2% Feo (iron ore) and 2% lime as the bottom material of the furnace;

[0083] At the end of melting and at the beginning of oxidation: add 20-25% Feo (iron ore), the temperature of molten steel is 1540-1560°C, the alkalinity is 2-3, and the P is removed to ≤0.0004%;

[0084] 3) Oxidation period: the amount of C removal ≥ 0.40%;

[0085] 4) Reduction period: P≤0.0005%, S≤0.0005%, C: 0.80~1.0...

Embodiment 2

[0115] The preparation method of the FB2 valve disc forging specifically includes the following steps:

[0116] (1) Melting steps:

[0117] In this step, the 13Cr9Mo2Co1NiVNbB steel ingot is made into a valve forging billet by successively adopting an electric arc furnace melting step, an external refining step, and an electroslag remelting step; wherein the electric arc furnace melting step is as follows:

[0118] 1) Ingredients: S, P≤0.030% high-quality steel scrap and pure Cr, Mo, Co, N, V, Nb, B alloy materials;

[0119] 2) Melting period:

[0120] Before starting the furnace, add 1-2% Feo (iron ore) and 2% lime as the bottom material of the furnace;

[0121] At the end of melting and at the beginning of oxidation: add 20-25% Feo (iron ore), the temperature of molten steel is 1540-1560°C, the alkalinity is 2-3, and the P is removed to ≤0.0004%;

[0122] 3) Oxidation period: the amount of C removal ≥ 0.40%;

[0123] 4) Reduction period: P≤0.0005%, S≤0.0005%, C: 0.80~1.0...

Embodiment 3

[0139] The preparation method of the FB2 valve stem forging specifically comprises the following steps:

[0140] (1) Melting steps:

[0141] In this step, the 13Cr9Mo2Co1NiVNbB steel ingot is made into a valve forging blank by successively adopting an electric arc furnace melting step, an external refining step, a vacuum degassing step, and an electroslag remelting step; wherein the electric arc furnace melting step is as follows:

[0142] 1) Ingredients: S, P≤0.030% high-quality steel scrap and pure Cr, Mo, Co, N, V, Nb, B alloy materials;

[0143] 2) Melting period:

[0144] Before starting the furnace, add 1-2% Feo (iron ore) and 2% lime as the bottom material of the furnace;

[0145] At the end of melting and at the beginning of oxidation: add 20-25% Feo (iron ore), the temperature of molten steel is 1540-1560°C, the alkalinity is 2-3, and the P is removed to ≤0.0004%;

[0146] 3) Oxidation period: the amount of C removal ≥ 0.40%;

[0147]4) Reduction period: P≤0.0005%...

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Abstract

The invention discloses a manufacturing method of an FB2 valve forged piece for an ultra-supercritical turbine. The method comprises the following steps of smelting, forging, valve forged piece heat treatment, machining and heat treatment. The invention further discloses a valve forged piece manufactured by the adoption of the manufacturing method of the FB2 valve forged piece for the ultra-supercritical turbine. According to the manufacturing method, operation is reasonable, effective boron is contained, hardenability of the forged piece reaches the standard, the grain size of the final forged piece is larger than or equal to the grade 3, and according to the manufacturing method of the FB2 valve forged piece for the 625 DEG C ultra-supercritical turbine and the FB2 valve forged piece, the situation that Y-shaped cracks appear in the center of the forged piece is avoided.

Description

technical field [0001] The invention relates to a method for manufacturing a FB2 valve forging (valve seat, valve disc, valve stem, ring) for a steam turbine of a million-kilowatt class ultra-supercritical generating set with a heat-resistant temperature of 625°C and the valve forging. Background technique [0002] CO 2 The environmental problems caused by emissions are increasingly concerned by the world, and the development and adoption of ultra-supercritical technology is currently the key to reducing CO 2 An important and proven measure of emissions. my country's primary energy is dominated by coal and will not change in a relatively long period of time. Environmental protection has become a new impetus for the development and adoption of supercritical units in my country. The temperature parameters of super (super) critical units that are already in operation or in the design and construction stage are mostly 566-600 °C, and the pressure is divided into three levels: ...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/10C21D1/26C21D9/00C21D1/18B21K1/20B21K1/24F01D17/10
CPCB21K1/205B21K1/24C21C5/52C21C7/10C21D1/18C21D1/26C21D9/0068F01D17/10Y02P10/20
Inventor 董之
Owner SHANGHAI TENGHUI FORGING
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