Manufacturing process for metal expansion joint used for exhaust system of combustion gas turbine

A metal expansion and exhaust system technology, which is applied in the manufacturing field of gas turbine intake and exhaust systems, can solve problems such as high-temperature flue gas leakage, impact on the life of ordinary metal expansion joints, and impact on unit benefits, etc., to achieve improved toughness and uniform mechanical properties , steel tight effect

Inactive Publication Date: 2015-03-25
江苏华强新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The high temperature exhaust of the gas turbine will have a great impact on the metal expansion joints in the flue and exhaust system. If frequent washing is added, the life of ordinary metal expansion joints will be greatly affected. Once the expansion joints rupture, it will cause high temperature The leakage of flue gas not only affects the efficiency of the unit but may also cause other accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The manufacturing process of a metal expansion joint used in the exhaust system of a gas turbine provided in this embodiment uses chromium-nickel-molybdenum alloy structural steel as the blank, and the weight percentage composition of the chromium-nickel-molybdenum alloy is: carbon: 0.38%, silicon: .35% , manganese: 0.90%, chromium: 1.50%, nickel: 4.00%, molybdenum: 0.40%-0.60%, phosphorus: 0.015%, sulfur: 0.015%, hydrogen: 2.0ppm, vanadium: 0.20%, titanium: 0.025%, copper : 0.20%, aluminum: 0.05%, 0.50% residual elements, the rest is Fe;

[0033] Step (1): Put the chromium-nickel-molybdenum alloy billet into the heating furnace and heat it to 1360°C. After leaving the heating furnace, use water cooling to cool the steel bar to 930°C at a cooling rate of 25°C / s, and use water or quenching liquid in the quenching device Quenching, then heating to 630°C in a tempering furnace for tempering, and then cooling to room temperature;

[0034] Step (3): Preliminary hot rolling ...

Embodiment 2

[0050] The manufacturing process of a metal expansion joint used in the gas turbine exhaust system provided in this embodiment uses chromium-nickel-molybdenum alloy structural steel as the blank, and the composition of the chromium-nickel-molybdenum alloy weight percentage is: carbon: 0.30%, silicon: 0.30%, Manganese: 0.60%, Chromium: 1.00%, Nickel: 3.50%, Molybdenum: 0.5%, Phosphorus: 0.010%, Sulfur: 0.010%, Hydrogen: 1.5ppm, Vanadium: 0.15%, Titanium: 0.020%, Copper: 0.15%, Aluminum: 0.04%, 0.40% residual elements, the rest is Fe;

[0051] Step (1): Put the chromium-nickel-molybdenum alloy billet into the heating furnace and heat it to 1360°C. After leaving the heating furnace, use water cooling to cool the steel bar to 930°C at a cooling rate of 23-25°C / s. Water or The quenching liquid is used for quenching, and then heated to 630°C in the tempering furnace for tempering, and then cooled to room temperature;

[0052] Step (3): Preliminary hot rolling of the chromium-nickel...

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Abstract

The invention discloses a manufacturing process for a metal expansion joint used for an exhaust system of a combustion gas turbine. Chromated nickel molybdenum alloy structure steel is selected as a blank. A chromated nickel molybdenum alloy comprises, by weight, 0.28-0.38% of carbon, 0-0.35% of silicon, 0-0.90% of manganese, 0.80-1.50% of chromium, 3.00-4.00% of nickel, 0.40-0.60% of molybdenum, 0-0.015% of phosphorus, 0-0.015% of sulfur, 0-2.0% of hydrogen, 0.10-0.20% of vanadium, 0-0.025% of titanium, 0-0.20% of copper, 0-0.05% of aluminum, 0-0.50% of residual elements, and the balance Fe. A tetraethyl orthosilicate inorganic high-temperature-resistant coating is selected for carrying out coating. The manufacturing process for the metal expansion joint used for the exhaust system of the combustion gas turbine can greatly improve the abrasion resistance, the compressive resistance, the high-temperature resistance and the corrosion resistance of the metal expansion joint, and improve the production efficiency of the metal expansion joint, and is convenient to operate.

Description

technical field [0001] The invention relates to the manufacturing field of gas turbine intake and exhaust systems, in particular to a manufacturing process for metal expansion joints used in the gas turbine exhaust system. Background technique [0002] The high-temperature exhaust of the gas turbine will have a great impact on the metal expansion joints in the flue and exhaust system. If frequent washing is added, the life of ordinary metal expansion joints will be greatly affected. Once the expansion joints rupture, it will cause high temperature The leakage of flue gas not only affects the efficiency of the unit but may also cause other accidents. [0003] In practical application, the metal expansion joint is a kind of flexible structure arranged on the container shell or pipeline to compensate the additional stress caused by temperature difference and mechanical vibration; Reliable, good performance, compact structure and other advantages; metal expansion joints can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00C21D1/18C22C38/02C22C38/04C22C38/06C22C38/18C22C38/40C22C38/42C22C38/44C22C38/46C22C38/50
Inventor 陈欣邬文泰
Owner 江苏华强新能源科技有限公司
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