Ultralow hydrogen ceramic welding flux for chrome molybdenum heat resistant steel and preparation method thereof

A ceramic flux, heat-resistant steel technology, applied in welding equipment, welding media, manufacturing tools, etc., can solve the problems of moisture absorption of flux, difficult to control the content of diffusible hydrogen at a low level, achieve stable arc, optimize high-speed welding, Beautifully formed weld seam

Active Publication Date: 2014-07-23
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain flux with high alkalinity and low hydrogen content, high-temperature sintering is adopted, which can remove all or most of the moisture (including crystal water) in the flux at high temperature, and can also increase the strength of the flux and reduce its fragmentation. The

Method used

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  • Ultralow hydrogen ceramic welding flux for chrome molybdenum heat resistant steel and preparation method thereof
  • Ultralow hydrogen ceramic welding flux for chrome molybdenum heat resistant steel and preparation method thereof
  • Ultralow hydrogen ceramic welding flux for chrome molybdenum heat resistant steel and preparation method thereof

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Embodiment Construction

[0037] The present invention can be explained in detail through the following embodiments, and the purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0038] The specific composition ratio of ceramic flux is shown in Table 1.

[0039] Table 1 Example composition ratio (wt%)

[0040] Numbering

Example 1

Example 2

Example 3

MgO

28%

35%

32%

CaF 2

twenty two%

17%

20%

Al 2 O 3

20%

13%

19%

CaO

11%

8%

10%

SiO 2

10%

9%

5%

K 2 O+NaO

1%

5%

3.5%

Si-Fe

0.5%

1.5%

2%

Mn-Fe

0.5%

3.5%

2.5%

MgCO 3

7%

8%

6%

[0041] This flux has excellent welding process performance, stable arc during welding, bright and no oxidized color on the surface of the weld, good slag removal in the groove, the bottom slag removal rate after vibration reaches more than 75%, the slag in the groove automatically lifts up, and it can be touched. Take off. The weld is beautifully formed, the w...

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Abstract

Ultralow hydrogen ceramic welding flux for chrome molybdenum heat resistant steel comprises the following components, by mass percent, 28%-35% of MgO, 6%-15% of CaO, 17%-22% of CaF2, 13%-20% of Al2O3, 5%-10% of SiO2, 1%-5% of K2O + NaO, 0.5%-3.5% of ferromanganese, 0.5%-2% of ferrosilicon, and 6%-8% of MgCO3. The ultralow hydrogen ceramic welding flux for the chrome molybdenum heat resistant steel contains magnesia, fluoride, silicate, carbonate, the ferromanganese and the ferrosilicon serving as reducing agents and quartz which improves slag detachability and appearance of welding seams. When the ultralow hydrogen ceramic welding flux for the chrome molybdenum heat resistant steel is used for welding, the electric arc is stable, the slag detachability in the welding seams is good, the appearance of the welding seams is attractive, and the surfaces of the welding seams are free of cracks, air holes, indentations and other welding defects.

Description

Technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an ultra-low hydrogen ceramic flux for chromium-molybdenum heat-resistant steel. Background technique [0002] It is known that chromium-molybdenum steel has special high-quality properties and 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. 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 high temperature, high pressure, and various corrosive media conditions. The test of welding materials. As the application of Cr-Mo series heat-resistant steel becomes more and more extensive, the safe and economic operation of pressure vessel steel and welded joints will play a k...

Claims

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Application Information

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IPC IPC(8): B23K35/36B23K35/362B23K35/40
CPCB23K35/3602B23K35/362
Inventor 朱珍彪范会卿
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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