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Heat-resisting alloy for 700-DEG C ultra-supercritical boiler water-cooling wall and tubing manufacturing method

An ultra-supercritical boiler and heat-resistant alloy technology, applied in the field of heat-resistant alloys, can solve the problems of difficulty in guaranteeing weld quality, unsolved problems in the selection of boiler water-cooled wall materials, and difficulty in heat treatment. Heat treatment, the effect of improving weldability

Active Publication Date: 2016-03-23
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even so, there are still great difficulties in installing local post-weld heat treatment on site and the quality of welds is difficult to guarantee
[0009] At present, the problem of material selection for the water wall of ultra-supercritical boilers with a steam temperature of 700 °C in my country has not been resolved.

Method used

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  • Heat-resisting alloy for 700-DEG C ultra-supercritical boiler water-cooling wall and tubing manufacturing method
  • Heat-resisting alloy for 700-DEG C ultra-supercritical boiler water-cooling wall and tubing manufacturing method
  • Heat-resisting alloy for 700-DEG C ultra-supercritical boiler water-cooling wall and tubing manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] (1) Smelting

[0058] Selected raw materials, using vacuum induction + electroslag remelting + vacuum self-consumption triple smelting process, the composition and quality ratio is as follows:

[0059] C:0.035%; Cr:22.8%; Co:12.5%; Mo:8.7%; W:0.5%; B:0.0035%; Zr:0.01%; Mn:0.09%; Si:0.035%; Cu:0.1%; P: 0.002%; S: 0.0006%; N: 0.01%; O: 0.008%; Ca: 0.009%; Pb: 0.0005%; Sb: 0.0008%; Sn: 0.0009%; The rest is Ni and unavoidable impurities.

[0060] The self-consumption ingot weighs 845kg.

[0061] (2) Alloy ingot homogenization and forging blank

[0062] When the consumable ingot is put into the furnace, the furnace temperature is 450°C, soak for 6 hours, control the heating rate at 40°C / h, when the temperature is 1000°C, adjust the heating rate to 80°C / h, control the soaking temperature at 1200°C, and hold for 54 hours . Then cool down to the forging start temperature of 1165°C for soaking, and the soaking time is 240min. The temperature of the blank forging is 1165°C, t...

Embodiment 2

[0077] (1) Smelting

[0078] Selected raw materials, using vacuum induction + vacuum self-consumption dual smelting process, the composition and mass ratio is:

[0079] C:0.04%; Cr:23.1%; Co:12.9%; Mo:8.3%; W:1.0%; B:0.0045%; Zr:0.008%; Mn:0.07%; Si:0.02%; Cu:0.09%; P: 0.0015%; S: 0.0007%; N: 0.009%; O: 0.009%; Ca: 0.008%; Pb: 0.0009%; Sb: 0.0004%; Sn: 0.0007%; The rest is Ni and unavoidable impurities.

[0080] The self-consumption ingot weighs 800kg.

[0081] (2) Alloy ingot homogenization and forging blank

[0082] When the electroslag ingot is put into the furnace, the furnace temperature is 430°C, soak for 5 hours, control the heating rate at 50°C / h, when the temperature is above 1000°C, adjust the heating rate at 100°C / h, control the soaking temperature at 1200°C, 50h. Then cool down to the forging start temperature of 1170°C for soaking, and the soaking time is 200min. The temperature of the blank forging is 1170°C, the temperature of the final forging is 1000°C, ...

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Abstract

The invention provides a heat-resisting alloy for a 700-DEG C ultra-supercritical boiler water-cooling wall and a tubing manufacturing method, and belongs to the technical field of heat-resisting alloys. The alloy comprises the following chemical components in percentage by weight: 0.03 to 0.05% of C, 22 to 24% of Cr, 12 to 14% of Co, 8.3 to 8.8% of Mo, 0.5 to 1.0% of W, 0.003 to 0.005% of B, 0.05 to 0.12% of Zr, less than 0.1% of Mn, less than 0.05% of Si, not greater than 0.15% of Cu, not greater than 0.002% of P, not greater than 0.001% of S, not greater than 0.01% of N, not greater than 0.01% of O, not greater than 0.01% of Ca, not greater than 0.001% of Pb, not greater than 0.001% of Sb, not greater than 0.001% of Sn, not greater than 0.0001% of Bi, not greater than 0.001% of As, and the balance Ni and inevitable impurity elements. The manufacturing method comprises the following steps: smelting; homogenizing; cogging; thermally extruding; performing cold rolling; performing solid solution heat treatment. The alloy and the manufacturing method have the advantages that the endurance strength extrapolation number of a produced tubing under 600 DEG C and 105 hours is not less than 130MPa, which is far more than that of a T92 material, thus the requirement of a service environment of the 700-DEG C ultra-supercritical boiler water-cooling wall can be met, and postweld heat treatment is avoided.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant alloys, and in particular provides a heat-resistant alloy for a 700°C ultra-supercritical boiler water wall and a method for manufacturing a pipe. 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. In 2010, the National Energy Administration announced in the Great Hall of the People that the "National 700°C Ultra-supercritical Coal-fired Power Generation Technology Innovation Alliance" was formally established and launched, marking China's formal development of 700°C ultra-supercritical thermal power unit technology. At present, Europe, the United States, Japan, China and India are gathering national scientific and technological strength to develop 700°C ultra-supercritical coal-fired power generation technology, with a view to further ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/32C22C38/30C22C38/22C22C38/28C22C38/20C21D6/00C21D8/10
CPCC21D6/002C21D8/105C22C38/002C22C38/008C22C38/20C22C38/22C22C38/28C22C38/30C22C38/32C22C38/60
Inventor 刘正东陈正宗包汉生杨钢干勇
Owner CENT IRON & STEEL RES INST
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