Submerged-arc flux for low-temperature impact of Cr-Mo heat-resistant steel and narrow-gap submerged-arc welding and preparation method thereof

A low-temperature impact and heat-resistant steel technology, applied in welding medium, manufacturing tools, welding equipment, etc., can solve the problems of Cr-Mo steel thermal cracks, in the blank stage, etc., to achieve excellent low-temperature impact toughness, good welding processability, Effect of Reasonable Tensile Strength

Active Publication Date: 2015-05-20
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the application of Cr-Mo series heat-resistant steel more and more widely, the safe and economical operation of pressure vessel steel and welded joints will play a key role in various industries in the country. Therefore, the corresponding welding materials are put forward In addition, Cr-Mo steel is easy to cause defects such as cold and hot cracks in welding. Commonly used welding consumables for heat-resistant steel are suitable for normal temperature and large gap welding conditions; while narrow groove and special heat-resistant steel welding In the environment where low temperature impact toughness (-40°C) is required, the corresponding submerged arc flux is still in the blank stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The components are: SiO2 10kg, MgO 35kg, Al2O3 25kg, ΣCaO 20kg, MnO 0.5kg, Na2O 0.5kg, K2O 1.0kg, TiO2 1.0kg, Fe2O3 0.5kg, S 0.015kg and P0.021kg industrial pure powder Put it in a mixer, stir and mix evenly, add 18kg of sodium water glass to mix and granulate, then bake at a low temperature of 300°C, sinter at a high temperature of 800°C, and sieve to obtain a flux with an alkalinity of 2.8, which is combined with a special welding wire CHW-S8LH is submerged arc welding with 20mm thick E36 plate (CHH407A electrode stacking edge), and its process performance is excellent. The performance of the weld seam after testing is: the tensile strength of the welded joint is 665Mpa, the reduction rate of the section is 51%, and the summer heat of the weld seam The specific impact energy is Akv (-30°C) = 200-250J, the Charpy impact energy of the weld is Akv (-40°C) = 112-190J, the temper brittleness test VTr54+3△VTr54<-38°C, the bending test They are also qualified (the bending an...

Embodiment 2

[0074] The components are: SiO2 18kg, MgO 30kg, Al2O3 18kg, ΣCaO 28kg, MnO 1.0kg, Na2O 1.0kg, K2O 1.5kg, TiO2 2.0kg, Fe2O3 1.0kg, S 0.015kg and P0.021kg industrial pure powder Put it in a mixer, stir and mix evenly, add 17kg of potassium silicate to mix and granulate, then bake at 300°C, sinter at 700°C, and sieve to get a flux with a flux alkalinity of 2.6. Welding wire CHW-S8LH is submerged arc welding with 20mm thick E36 plate (CHH407A welding rod heaping edge). The Charpy impact energy is Akv (-30°C) = 190-245J, the Charpy impact energy of the weld is Akv (-40°C) = 110-170J, the temper brittleness test VTr54+3△VTr54<-30°C, bending The test is also qualified (the bending angle is 180°, and the bending diameter is four times the wall thickness).

Embodiment 3

[0076] The components are: SiO2 15kg, MgO 27kg, Al2O3 30kg, ΣCaO 25kg, MnO 1.5kg, Na2O 1.0kg, K2O 1.0kg, TiO2 2.5kg, Fe2O3 1.5kg, S 0.015kg and P0.021kg industrial pure powder Put it in a mixer, stir and mix evenly, add 17.5kg of potassium sodium water glass to mix and granulate, then bake at 300°C at low temperature, sinter at 800°C at high temperature, and sieve to obtain flux with a flux alkalinity of 2.7. Cooperate with special welding wire CHW-S8LH, use 20mm thick E36 plate (CHH407A welding rod heap) for submerged arc welding, the process performance is excellent, the performance of the weld seam after testing is: the tensile strength of the welded joint is 650Mpa, the reduction of area is 52%, the weld The Charpy impact energy of the seam is Akv (-30°C) = 200-260J, the Charpy impact energy of the weld is Akv (-40°C) = 115-180J, and the temper brittleness test VTr54+3△VTr54<-30°C , The bending test is also qualified (the bending angle is 180°, and the bending diameter is ...

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Abstract

The invention discloses a submerged-arc flux for low-temperature impact of Cr-Mo heat-resistant steel and narrow-gap submerged-arc welding, and relates to the welding field. The flux comprises the following ingredients by mass percent, SiO28-20%; MgO20-40%; A12O315-30%; sigmaCaO15-28%; MnO0.5-5%; Na2O0.5-2%; K2O0.5-2%; TiO20.5-3%; Fe2O3< / =3.0%; S< / =0.030%; P< / =0.030%. The flux is special for the narrow-gap welding and the submerged-arc welding on the low-temperature impact of the Cr-Mo heat-resistant steel.

Description

technical field [0001] The invention relates to a flux, in particular to a submerged arc welding flux for low-temperature impact and narrow gap submerged arc welding of chrome-molybdenum heat-resistant steel, a preparation method and a special welding wire. Background technique [0002] Due to the special high-quality properties of chrome-molybdenum steel, it is often used to manufacture some high-temperature and high-pressure-resistant valves and pressure vessels. The low-alloy heat-resistant steel used in pressure vessels is mainly Cr-Mo. After years of development, In order to improve the creep strength, durable strength and structural stability of the steel, a small amount of vanadium, titanium and other elements are added to the steel. This type of steel not only has high temperature resistance, but also has good hydrogen corrosion resistance, but How to ensure that after welding, the welded joint has the same performance as the base metal under the conditions of high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
Inventor 毛兴贵曾志超兰志刚贾兴旺
Owner ATLANTIC CHINA WELDING CONSUMABLES
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