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Dissimilar steel welding method for martensite heat-resisting steel and austenitic heat-resisting steel

A technology of austenitic heat-resistant steel and welding method, applied in the field of dissimilar steel welding of martensitic heat-resistant steel and austenitic heat-resistant steel, can solve the problems that restrict the design, manufacture and safe operation of ultra-supercritical units, lag and other problems, to achieve significant economic and social benefits, less control parameters, and simple operation.

Inactive Publication Date: 2014-09-03
XIAN SPECIAL EQUIP INSPECTION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, my country's research on dissimilar steel welding technology of martensitic heat-resistant steel and austenitic heat-resistant steel lags far behind that of Europe, America and Japan. The technical data and data are almost entirely dependent on steel suppliers and foreign related technical documents. To a large extent, it restricts the design, manufacture and safe operation of ultra-supercritical units in my country

Method used

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  • Dissimilar steel welding method for martensite heat-resisting steel and austenitic heat-resisting steel
  • Dissimilar steel welding method for martensite heat-resisting steel and austenitic heat-resisting steel

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Experimental program
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Effect test

Embodiment 1

[0036] Martensitic heat-resistant steel is selected from T92 steel pipe produced by Shanghai Baosteel. Austenitic heat-resistant steel is selected from Super304H steel pipe imported from Germany. The outer diameter of T92 steel pipe is 45mm and the thickness is 9mm. The outer diameter of Super304H steel pipe is 45mm , the thickness is 9mm, and the length of the two steel pipes is 0.15m. Before welding, the welding surface of the steel pipe shall be kept clean and shall not be polluted.

[0037] The continuous drive friction welding machine used meets the following performance requirements: the friction process can achieve bipolar pressure, the first stage of pressure, the speed meets 0-1800 rpm, the friction pressure meets 0-75MPa, and the friction time meets 0-6 seconds. In the second stage of pressurization, the rotation speed meets 0-1800 rpm, the friction pressure meets 0-200MPa, and the friction time meets 0-20 seconds. In the upsetting stage, the upsetting pressure m...

Embodiment 2

[0045] Follow the steps below to weld T91 steel pipe and Super304H steel pipe

[0046] 1) According to the technical requirements of the friction welding machine, install the T91 steel pipe and the Super304H steel pipe respectively, and require the friction welding machine clamp to clamp the steel pipe. The T91 steel pipe and the Super304H steel pipe cannot shake, and the centerlines of the two steel pipes should be kept on a horizontal line;

[0047] 2) In the first stage of pressurization, the speed is 1800 rpm, the friction pressure is 50MPa, and the friction time is 5 seconds;

[0048] 3) In the second stage of pressurization, the speed is 1500 rpm, the friction pressure is 200MPa, and the friction deformation is 6mm;

[0049] 4) In the upsetting stage, the upsetting pressure is 200MPa, and the upsetting time is 5 seconds;

[0050] 5) The welded joints of martensitic heat-resistant steel pipes and austenitic heat-resistant steel pipes need to undergo local heat treatment...

Embodiment 3

[0052] 1) According to the technical requirements of the friction welding machine, install the T91 steel pipe and the Super304H steel pipe respectively, and require the friction welding machine clamp to clamp the steel pipe. The T91 steel pipe and the Super304H steel pipe cannot shake, and the centerlines of the two steel pipes should be kept on a horizontal line;

[0053] 2) In the first stage of pressurization, the speed is 1500 rpm, the friction pressure is 75MPa, and the friction time is 5 seconds;

[0054] 3) In the second stage of pressurization, the speed is 1500 rpm, the friction pressure is 150MPa, and the friction deformation is 6mm;

[0055] 4) In the upsetting stage, the upsetting pressure is 200MPa, and the upsetting time is 5 seconds;

[0056] 5) The welded joints of martensitic heat-resistant steel pipes and austenitic heat-resistant steel pipes need to undergo local heat treatment after welding to eliminate residual stress.

[0057] The heat treatment paramet...

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Abstract

A dissimilar steel welding method for martensite heat-resisting steel and austenitic heat-resisting steel includes the following steps that (1) according to technical requirements of a friction welding machine, a martensite heat-resisting steel tube and an austenitic heat-resisting steel tube are respectively installed and clamped through a fixture of the friction welding machine and cannot shake, and the center line of the martensite heat-resisting steel tube and the center line of the austenitic heat-resisting steel tube are kept in the same horizontal line; (2) at a first-level pressurization stage, the rotation speed is 1200-1800 revolutions per minute, friction pressure is 25-75 MPa, and friction time is 4-6 seconds; (3) at a second-level pressurization stage, the rotation speed is 1200-1800 revolutions per minute, friction pressure is 100-200 MPa, and friction deformation is 4-8 mm; (4) at an upset forging stage, upset forging pressure is 150-250 MPa, and upset forging time is 4-6 seconds; (5) partial heat treatment needs to be carried out on a welded joint between the martensite heat-resisting steel tube and the austenitic heat-resisting steel tube after welding, so that residual stress is eliminated. The method has the advantages that quality of the joints is high, the method is suitable for welding of heterogeneous materials, production efficiency is high, production cost is low, energy is saved, and environment is protected.

Description

technical field [0001] The invention belongs to the technical field of dissimilar steel welding of ultra-supercritical units, and in particular relates to a method for welding dissimilar steel of martensitic heat-resistant steel and austenitic heat-resistant steel. Background technique [0002] Ultra-supercritical unit (Ultra-supercritical USC), as the world's most advanced clean coal power generation technology, has become an inevitable trend of thermal power generation in my country at present and in the future with its advantages of high efficiency, environmental protection and energy saving. According to incomplete statistics, there are nearly 50 ultra-supercritical (USC) units under construction and planned in my country, with a capacity of 600MW and 1000MW. These units have been put into operation since 2007, and my country has become the world's The country with the most USC crews in the world. One of the key technologies for the development of USC units is the develo...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/227C21D9/50
CPCB23K20/12B23K20/227B23K2103/04C21D9/50
Inventor 鲁元杨玉山韩建军荆强征杨旭贠柯丁勇
Owner XIAN SPECIAL EQUIP INSPECTION INST
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