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Low-hydrogen basic electrode for 25Cr2Ni4MoV alloy steel welding

A basic welding rod and alloy steel technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., to achieve the effects of good fluidity of molten pool, control of hydrogen content in deposited metal diffusion, and easy slag removal

Inactive Publication Date: 2010-11-24
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a low-hydrogen alkaline electrode for welding 25Cr2Ni4MoV alloy steel, which solves the problem that there is no special electrode for welding 25Cr2Ni4MoV alloy steel in the prior art

Method used

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  • Low-hydrogen basic electrode for 25Cr2Ni4MoV alloy steel welding
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  • Low-hydrogen basic electrode for 25Cr2Ni4MoV alloy steel welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1, making alloy steel welding core:

[0031] The preparation weight ratio is 1:1 for professional pure iron and industrial pure iron. Ores containing C, Si, Mo, Cr are placed around and on the upper part of the magnesia crucible in the induction furnace, Ni powder is placed in the middle of the crucible, Re, Mn, B put into the tray. The carbon in the crucible acts as a deoxidizer. Put the pure iron and the contents in the crucible together into the induction furnace for smelting. When the pure iron is completely melted, the temperature of the molten alloy steel reaches 1540°C, and when the molten steel is calm, turn off the power to cool and exhaust for 15 minutes; then turn on the power for refining, and after 20 minutes of refining , When the temperature of the alloy steel liquid drops to 1550°C, add Ti powder, and then tap the steel when the temperature continues to drop to the tapping temperature (the tapping temperature is 1540°C). Fill the furnace with argo...

Embodiment 2

[0043] Step 1, making alloy steel welding core:

[0044] The preparation weight ratio is 1:1 for professional pure iron and industrial pure iron. Ores containing C, Si, Mo, Cr are placed around and on the upper part of the magnesia crucible in the induction furnace, Ni powder is placed in the middle of the crucible, Re, Mn, B put into the tray. The carbon in the crucible acts as a deoxidizer. Put the pure iron and the contents in the crucible together into the induction furnace for smelting. When the pure iron is completely melted, the temperature of the molten alloy steel reaches 1540°C, and when the molten steel is calm, turn off the power to cool and exhaust for 15 minutes; then turn on the power for refining, and after 20 minutes of refining , When the temperature of the alloy steel liquid drops to 1550°C, add Ti powder, and then tap the steel when the temperature continues to drop to the tapping temperature (the tapping temperature is 1540°C). Fill the furnace with argo...

Embodiment 3

[0055] Step 1, making alloy steel welding core:

[0056] Prepare professional pure iron and industrial pure iron with a weight ratio of 1:1, put ores containing C, Si, Mo, Cr around and on the upper part of the magnesia crucible in the induction furnace, Ni powder in the middle of the crucible, Re, Mn, B Put in the pan. The carbon in the crucible acts as a deoxidizer. Put the pure iron and the contents in the crucible together into the induction furnace for smelting. When the pure iron is completely melted, the temperature of the molten alloy steel reaches 1540°C, and when the molten steel is calm, turn off the power to cool and exhaust for 15 minutes; then turn on the power for refining, and after 20 minutes of refining , When the temperature of the alloy steel liquid drops to 1550°C, add Ti powder, and then tap the steel when the temperature continues to drop to the tapping temperature (the tapping temperature is 1540°C). Fill the furnace with argon 5 minutes before tappin...

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Abstract

The invention discloses a low-hydrogen basic electrode for 25Cr2Ni4MoV alloy steel welding, which comprises a core wire and a coating, wherein the coating is prepared from the following materials in percentage by weight: 40-47% of marble, 16-24% of fluorite, 3-6% of quartz, 3-6% of zircon sand, 4-12% of rutile, 6-11% of ferrotitanium, 4-8% of low-carbon ferromanganese, 2-5% of ferrosilicon, 1-3% of rare earth ferrosilicon, 2.8-3.2% of synthetic mica and 0.5-1.5% of soda ash, and the sum of the weight percentage of all the components is 100%.The electrode prepared from the coating has the advantages of high arc stabilizing performance, good molten pool fluidity, fine splashing particles, easier deslagging after welding, uniform slag covering and delicate and attractive molded weld. Besides, the diffusible hydrogen content of the deposited metal of the prepared electrode is effectively limited.

Description

technical field [0001] The invention belongs to the technical field of welding in material processing, and in particular relates to a low-hydrogen alkaline electrode for welding 25Cr2Ni4MoV alloy steel. Background technique [0002] In recent years, the use of large-scale fans in my country's industry has become more and more widely used, and the working conditions have become more and more complicated. In order to improve the overall quality of the fan, the blade material of the core part of the fan is required to have good comprehensive mechanical properties such as high strength, toughness and hardness. . 25Cr2Ni4MoV steel is the steel used for relatively large generator rotors in my country at present. It has the advantages of high strength, high plasticity and toughness, and low brittle transition temperature. In industrial applications, through quenching and tempering (quenching + high temperature tempering) to obtain excellent strength and toughness matching, it is ma...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/362
Inventor 张敏李继红李岩
Owner XIAN UNIV OF TECH
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