Method for processing austenite seamless stainless steel rectangular water pipe used for turbine generator

A turbogenerator and processing method technology, applied in the direction of pipes, rigid pipes, mechanical equipment, etc., can solve the problems of unqualified intergranular corrosion, poor surface quality, large size deviation, etc., to eliminate lattice defects, reduce Effect of intermediate annealing and reduction of drawing resistance

Active Publication Date: 2008-08-20
TAIXING SHENGDA COPPER IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art, such as many processes, high cost, low yield, unqualified intergranular corrosion, high magnetic permeability, large size deviation, and poor surface quality of processed products, and provide a process with few processes, Processing method of austenitic seamless stainless steel rectangular water pipe for 1000MW ultra-supercritical turbogenerator with low cost, high yield, convenient operation, stable process, integrating heating and piercing deformation

Method used

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  • Method for processing austenite seamless stainless steel rectangular water pipe used for turbine generator

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Embodiment 1

[0022]The mass percentage content is carbon 0.010%, silicon 0.09%, manganese 0.2%, sulfur 0.001%, phosphorus 0.001%, chromium 18.10%, nickel 9.10%, rare earth element Re 0.003%, silver 0.002%, and the balance is iron and Austenitic stainless steel with impurities is hot-rolled into Φ13mm round steel at 1180°C; the round steel is stripped and passed through a continuous extruder at an extrusion speed of 50 m / h at a temperature of 890°C on the extruder instrument. Extruded into a bright round tube of Φ10.5mm and wall thickness of 0.82mm, and cut to length according to the process requirements; the outer surface of the cut-to-length round tube is evenly coated with 3.1% tallow, 32% molybdenum disulfide, 6.9% of PS6040 drawing oil and the rest of slaked lime are composed of compound lubricants according to mass percentage, and then the fixed-length round tube is drawn into an elliptical tube with a minor axis of 7mm and a major axis of 12mm by using a mandrelless rod, and then on t...

Embodiment 2

[0024] The mass percentage content is carbon 0.012%, silicon 0.19%, Mn0.37%, sulfur 0.002%, phosphorus 0.004%, chromium 18.50%, nickel 9.80%, rare earth element Re0.002%, silver 0.003%, and the balance is iron Austenitic stainless steel with impurities is hot rolled into Φ14.5mm round steel at a temperature of 1200°C; after the round steel is peeled, it is extruded at a rate of 45 m / h through a continuous extrusion machine at a temperature of 890°C displayed on the instrument of the extrusion machine The speed is continuously extruded into a bright round tube of Φ12mm and wall thickness 0.93mm, and cut to length according to the process requirements; the outer surface of the cut-to-length round tube is evenly coated with 3.5% tallow, 38% molybdenum disulfide, 5.5% of PS6040 drawing oil and the rest of slaked lime are composed of compound lubricants according to mass percentage, and then the fixed-length round tube is drawn into an elliptical tube with a minor axis of 7.8mm and ...

Embodiment 3

[0026] The mass percentage content is carbon 0.015%, silicon 0.24%, manganese 0.50%, sulfur 0.0012%, phosphorus 0.0014%, chromium 18.70%, nickel 10.10%, rare earth element Re 0.005%, silver 0.001%, and the balance is iron and Austenitic stainless steel with impurities is hot-rolled at a temperature of 1200°C into a Φ15.8mm round steel; after the round steel is peeled, it is extruded at a rate of 40 m / h through a continuous extrusion machine at a temperature of 900°C displayed on the instrument of the extrusion machine The speed is continuously extruded into a bright round tube of Φ13.4mm and wall thickness of 0.92mm, and cut to length according to the process requirements; the outer surface of the cut-to-length round tube is evenly coated with 3.8% tallow and 36% disulfide Molybdenum, 5.4% PS6040 drawing oil and the composite lubricant composed of the balance of slaked lime according to the mass percentage, then the fixed-length round tube is drawn into an elliptical tube with ...

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Abstract

The invention relates to a processing method of an austenitic seamless stainless steel rectangle water pipe used for a turbo-generator, which sequentially has the processing steps of hot rolling round bar, continuous extruding round pipe, drawing an elliptic pipe with a non-core bar, drawing a rectangle pipe with a short core bar, and carrying out solution treatment and annealing to obtain the finished product. According to the mass percentage, the stainless steel which is adopted by the water pipe contains carbon less than or equal to 0.030%, silicon less than or equal to 1.0%, manganese less than or equal to 2.0%, sulphur less than or equal to 0.030 %, phosphorus less than or equal to 0.035%, chromium ranging from 18.00% to 20.00%, Ni ranging from 9.0% to 13.0%, rare earth element Re ranging from 0.002% to 0.008%, silver ranging from 0.001% to 0.005%, and iron and other impurities with the residual quantity; wherein, the rare earth element is a compound which consists of 40% to 45% of Ce, 40% to 45% of lanthanum and Yt with residual quantity according to the mass percentage. The processed water pipe has good toughness, strong corrosion resistance and low magnetic permeability, and is an ideal material used for the motor stator water pipes of 1000MW-class turbo-generators.

Description

technical field [0001] The invention relates to a processing method for a high-strength and strong corrosion-resistant austenitic seamless stainless steel rectangular water pipe used for a 1000MW ultra-supercritical turbogenerator. Background technique [0002] At present, the manufacture of generators is developing in the direction of large capacity, environmental protection, high efficiency, and low cost. Therefore, the key components of the stator water cooling pipe, that is, the performance and quality of the water pipe, such as strength, corrosion resistance, and magnetic permeability, are increasingly required. High, the cost requirements are getting lower and lower. The copper hollow wires widely used in 300MW and 600MW steam turbine generators cannot meet the requirements of 1000MW ultra-supercritical turbine generators due to their shortcomings such as poor strength, poor corrosion resistance, large additional loss, and high cost. [0003] The 1000MW ultra-supercri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02
Inventor 李民赵重庆洪文新曹玖霞潘云忠
Owner TAIXING SHENGDA COPPER IND CO LTD
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