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Special stainless steel electrode for deep refrigerating project

A stainless steel and engineering technology, applied in the direction of welding medium, manufacturing tools, welding equipment, etc., can solve the problems of poor welding processability, reducing the ferrite content of the weld, affecting the thermal cracking resistance of the weld, etc.

Active Publication Date: 2010-05-05
BEIJING JINWEI WELDING MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-hydrogen basic electrode has poor welding processability. In addition, excessively reducing the ferrite content of the weld will inevitably affect the thermal cracking resistance of the weld.

Method used

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  • Special stainless steel electrode for deep refrigerating project

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, get rutile 38kg; Marble 13kg; Titanium dioxide 3kg; Quartz 1kg; Mica 5kg; Ferrosilicon 6kg; and calcium oxide, the remaining ingredients are a small amount of other oxides, used to improve the pressure coating of the electrode) 1kg; sodium carbonate 3kg; cryolite 5kg; Mix evenly in the medium, press-coat it on the H00Cr21Ni10 stainless steel welding core with a hydraulic machine, let the electrode dry naturally for 24 hours, and then dry it. The ferrite content and impact toughness test values ​​of the deposited metal are shown in Table 2.

Embodiment 2

[0023] Embodiment 2, get rutile 46kg; Marble 14kg; Titanium dioxide 2kg; Quartz 3kg; Mica 4kg; Ferrosilicon 5kg; and calcium oxide, the rest of the ingredients are a small amount of other oxides, used to improve the pressure coating of the electrode) 2kg; sodium carbonate 1kg; cryolite 7kg; Mix evenly in the medium, press-coat it on the H00Cr21Ni10 stainless steel welding core with a hydraulic machine, let the electrode dry naturally for 24 hours, and then dry it. The ferrite content and impact toughness test values ​​of the deposited metal are shown in Table 2.

Embodiment 3

[0024] Embodiment 3, get rutile 43kg; Marble 15kg; Titanium dioxide 1kg; Quartz 2kg; Mica 6kg; Ferrosilicon 4kg; and calcium oxide, the rest of the ingredients are a small amount of other oxides, used to improve the pressure coating of the electrode) 3kg; sodium carbonate 2kg; cryolite 4kg; Mix evenly in the medium, press-coat it on the H00Cr21Ni10 stainless steel welding core with a hydraulic machine, let the electrode dry naturally for 24 hours, and then dry it. The ferrite content and impact toughness test values ​​of the deposited metal are shown in Table 2.

[0025] Table 2 The ferrite content and impact toughness of the deposited metal in the embodiment

[0026]

[0027] Note: In the impact toughness, the average value of the three values ​​is in the brackets.

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Abstract

The invention relates to a special stainless steel electrode for a deep refrigerating project, belonging to the field of welding material; the special stainless steel electrode is formed by mixing the following powered raw materials b weight parts: 38-46 parts of rutile, 12-15 parts of marble, 1-3 parts of titanium pigment, 1-3 parts of quartz, 4-6 parts of mica, 4-6 parts of silicon iron, 2-4 parts of ferrotitanium, 6-8 parts of electrolytic manganese, 3-5 parts of chromium metal, 1-3 parts of calcium solvent, 1-3 pars of sodium carbonate, 4-7 parts of cryolite, 6-8n parts of feldspar, and potassium sodium water glass with 2 percent of total weight of powered materials; the mixture is stirred uniformly and is press-coated on a stainless steel core wire to form a stainless steel electrode. The ferrite content in weld metal is suitable, ferrite number FN of the weld metal is 6-8; the weld metal has good minus 196 DEG C low temperature impact property, the average value of the V-shaped impact work of the weld metal at below 196 DEG C is 45j, thereby completely meeting engineering needs.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a special stainless steel welding rod suitable for cryogenic engineering austenitic stainless steel. Background technique [0002] Austenitic stainless steel with a face-centered cubic lattice is often used as a low-temperature steel because of its excellent low-temperature toughness. The low-temperature impact value of the austenitic stainless steel base material is generally high, and the V-type impact value at -196°C is generally above 140J. Based on this, it is generally believed that the low temperature toughness of the weld metal will not be a problem, so there are usually no specific requirements for it. However, some domestic units have found that the low-temperature impact toughness of the weld metal is very low in the process of welding process evaluation for low-temperature liquid storage containers such as coiled heat exchangers and demethanizers. If the...

Claims

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Application Information

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IPC IPC(8): B23K35/365B05D7/20B05D7/24
Inventor 王士山边境陈波李伟王学东李柱
Owner BEIJING JINWEI WELDING MATERIAL
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