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Ultra-low hydrogen basic electrode for P92 steel welding

A basic electrode, ultra-low hydrogen technology, used in welding media, welding equipment, welding/cutting media/materials, etc.

Active Publication Date: 2008-05-21
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The development of calcium oxide slag-based P92 steel ultra-low hydrogen basic electrode has not yet been related to patents and literature reports at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] All embodiment welding rods are all made by common welding rod pressure coating machine:

[0025] 1. Choose Φ2.5 high chromium molybdenum steel wire rod as the steel core. Take 20 grams of ferromanganese, 40 grams of ferrosilicon, 15 grams of aluminum, 30 grams of nickel powder, 10 grams of quartz, 30 grams of ferro-niobium, 5 grams of ferro-vanadium, 50 grams of titanium dioxide, 200 grams of fluorite, 600 grams of marble, a total of 1000 grams And 40 grams of water glass, put into the powder mixer and mix for 10 minutes, then add the mixed powder in the welding rod press coater. Pressed into electrodes, the welding process parameters are: electrode drying (°C h): 350×2; preheating temperature (°C): 150-200; interlayer temperature (°C): 200-250; welding current (A): 110~130; welding voltage (V): 25~28; post-weld heat treatment specification (℃ h): 770±10×2~4; heating rate (℃ / h): 100~120; cooling rate (℃ / h ): 120~150. The results of mechanical properties are shown in...

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PUM

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Abstract

The invention provides an ultra low hydrogen-alkalinity welding rod used for welding a P92 steel, pertaining to the welding field of a material processing engineering. The invention is mainly used for the welding of the P92 steel. No relevant patent or report in literature concerning the manufacture of the P92 steel welding rod has ever been found at home and abroad. The invention is characterized in that formula of coating of the welding rod contains materials based on mass percent of 1-7 percent of ferromanganese, 4-9 percent of ferrosilicon alloy, 1.5-2.5 percent of aluminum, 3-8 percent of nickel powder, 1-4 percent of quartz, 3-6 percent of ferrocolumbium, 0.5-1.0 percent of ferrovanadium, 4.5-6 percent of titanium pigment, 20-30 percent of fluorite and 40-60 percent of marble. The manufactured welding rod has good technique performance and welding technique features of little splash, good fluidity of a molten pool, uniform covered slag, delicate and beautiful welding seam and easy removal of slag, and so on, compared with an imported welding rod. Content of diffusible hydrogen of deposited metal of the welding rod is effectively controlled and the content of the diffusible hydrogen of deposited metal is 1.985mL / 100g, which complies with the requirement of an ultra low hydrogen standard.

Description

technical field [0001] The invention belongs to the field of welding technology in material processing engineering, and the invention is mainly applied to the welding of P92 steel. Background technique [0002] Since the 1980s, countries such as the United States, Germany, France, and Japan have successively developed a series of new 9-12% chromium martensitic heat-strength steels, which can be used for supercritical and supercritical steels with steam parameters up to 600 / 610°C and 25MPa. Supercritical boiler unit. Typical steel grades are: T / P91, T / P92 (NF616) containing 9% Cr and T / P122 (HCM12A) containing 12% Cr. These steel types are high-performance heat-strength steels obtained by improving the original T / P9 and F12, and their high-temperature durable mechanical properties are significantly better than low-alloy pearlitic heat-resistant steels. The emergence of new martensitic heat-resistant steel provides the possibility and safety guarantee for the development of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365
Inventor 徐德录陈玉成李现兵韩钰王立全
Owner CHINA ELECTRIC POWER RES INST
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