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Coating transition type heat resistance steel welding rod for 650 DEG C ultra-supercritical thermal power generating unit

A thermal power unit, ultra-supercritical technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc.

Inactive Publication Date: 2018-06-22
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this new type of martensitic heat-resistant steel G115, there is no matching welding material in China

Method used

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  • Coating transition type heat resistance steel welding rod for 650 DEG C ultra-supercritical thermal power generating unit
  • Coating transition type heat resistance steel welding rod for 650 DEG C ultra-supercritical thermal power generating unit
  • Coating transition type heat resistance steel welding rod for 650 DEG C ultra-supercritical thermal power generating unit

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Embodiment Construction

[0031] The technical solutions of the present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these examples.

[0032] A 650°C ultra-supercritical thermal power unit coating transition type heat-resistant steel electrode, which is composed of a welding core and a coating, the coating is coated on the outer wall of the welding core, the welding core is made of carbon steel core wire, and the coating is made of CaO-CaF 2 -SiO 2 The slag system, the alloy elements are transitioned by coating; by weight percentage, the main chemical components of the deposited metal of the coating transition type heat-resistant steel electrode of the 650 °C ultra-supercritical thermal power unit are: C 0.06-0.10, Mn 0.30-0.90 , Si≤0.50, P≤0.008, S≤0.008, Cr8.5-9.5, Co 2.5-3.5, W2.5-3.5, Nb 0.02-0.09, V 0.15-0.24, Cu 0.50-1.10, B 0.010-0.024, N 0.005-0.025, the balance is Fe and impurities.

[0033] Preferably, by weigh...

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Abstract

The invention provides a coating transition type heat resistance steel welding rod for a 650 DEG C ultra-supercritical thermal power generating unit. A CaO-CaF2-SiO2 slag system formula is adopted, atrace of alloy elements are added, the main components of deposited metal are 9%Cr-3%W-3%Co, and the welding technology performance is good. Under the heat treatment condition of 100 DEG C x 1h+780 DEG C x 3h, the tensile strength Rm of the deposited metal is larger than or equal to 680 MPa, and the normal temperature KV2 is larger than or equal to 50 J; and the tensile strength Rm of a welding connector of the deposited metal is larger than or equal to 680 MPa, the normal temperature KV2 is larger than or equal to 50 J, and the low-alloy steel electric welding rod is suitable for the 650 DEGC steam temperature ultra-supercritical thermal power generating unit.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a coating-coated transitional heat-resistant steel welding rod for a 650°C ultra-supercritical thermal power unit. Background technique [0002] With the development of the electric power industry and the increasing global concern for environmental issues, saving primary energy, strengthening environmental protection, reducing harmful gas emissions, and reducing the global warming effect have attracted great attention at home and abroad. It is one of the effective ways to prevent environmental pollution to improve the thermal efficiency of thermal power units and adopt ultra-supercritical units. For thermal power units, the 700°C ultra-supercritical pressure boiler generator set is about 6% more efficient than the 600°C ultra-supercritical boiler generator set, which can save 200 million tons of coal per year and reduce 500 million tons of CO2 emissions per year. 2 . Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
Inventor 蔡鸿祥陈国栋王登峰周峙宏
Owner KUSN GINTUNE WELDING
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