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Welding method for 12Cr5Mo martensite stainless steel

A martensitic stainless steel, welding method technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of short service life, the mechanical properties of weld metal can not meet the requirements of petrochemical pipelines, etc., to achieve convenient installation and maintenance Effect

Active Publication Date: 2017-01-11
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the mechanical properties of the weld metal obtained by this method cannot meet the requirements of petrochemical pipelines, and the service life is short

Method used

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  • Welding method for 12Cr5Mo martensite stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A welding method of 12Cr5Mo martensitic stainless steel includes the following steps:

[0070] Step 1. Prepare the 12Cr5Mo martensitic stainless steel groove, prepare the groove as a Y-shaped groove, the groove angle is 60°, the gap is 2mm, and the blunt edge is 1mm; then the groove is butt-assembled; then the groove is welded. Carry out the pre-treatment of the groove: first polish the welding part of the groove with 200 grit sandpaper for 40s, then polish the welding part with 800 grit sandpaper for 20s, and then put it in a degreasing agent to remove the oil. The temperature of the degreasing agent is 30℃ , The degreasing time is 60s, and the last is washed with water; the degreasing agent is composed of the following raw materials by weight: 10 parts of sodium phosphate, 10 parts of sodium carbonate, OP-101 parts, and 20 parts of sodium silicate; finally, flame is used for the groove welding part The heating method is used for preheating, and the preheating is carried ...

Embodiment 2

[0113] A welding method of 12Cr5Mo martensitic stainless steel includes the following steps:

[0114] Step 1. Prepare the 12Cr5Mo martensitic stainless steel groove, prepare the groove as a Y-shaped groove with a groove angle of 90°, a gap of 3mm, and a blunt edge of 1.5mm; then butt the groove and assemble; then weld the groove Pre-treatment of the groove on the part: first polish the welding part of the groove with 400 grit sandpaper for 60s, then polish the welding part with 1000 grit sandpaper for 30s, and then put it in a degreaser to remove oil. The temperature of the degreaser is 40 ℃, degreasing time is 100s, and finally washed with water; degreasing agent is composed of the following raw materials by weight: 16 parts of sodium phosphate, 12 parts of sodium carbonate, OP-102 parts, and 30 parts of sodium silicate; finally used for the groove welding part The flame heating method is used for preheating, and the preheating is carried out evenly within the range of 200mm on ...

Embodiment 3

[0156] A welding method of 12Cr5Mo martensitic stainless steel includes the following steps:

[0157] Step 1. Prepare the 12Cr5Mo martensitic stainless steel groove, prepare the groove as a Y-shaped groove, with a groove angle of 70°, a gap of 2.5mm, and a blunt edge of 1.2mm; then butt the groove and assemble; The welding part is grooved for pre-treatment: first sand the groove welding part with 300 grit sandpaper for 50s, then sand the welding part with 900 grit sandpaper for 25s, and then put it in the degreasing agent to remove the oil. The temperature of the degreasing agent is 35℃, degreasing time is 80s, and finally washed with water; the degreasing agent is composed of the following raw materials by weight: 13 parts of sodium phosphate, 11 parts of sodium carbonate, OP-101.5 parts, and 25 parts of sodium silicate; the final welding part of the groove The flame heating method is used for preheating, and the preheating is carried out evenly within the range of 150mm on both...

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Abstract

The invention relates to a welding method for 12Cr5Mo martensite stainless steel. The welding method comprises the following steps: step I, preparing a 12Cr5Mo martensite stainless steel groove, carrying out butt-joint assembly on the groove, and pre-heating a welded part of the groove at a pre-heating temperature being 100-150 DEG C; and step II, separately carrying out a primary welding process, a secondary welding process and a tertiary welding process on the welded part of the groove by use of a welding rod, wherein the welding rod is composed of a welding core and a coating; and the welding core consists of the following raw materials: C, Ni, Cr, Mn, Si, Ti, Nb, V, Ta, Zr, La, Ce, Pr, W, N and Fe. The coating consist of the following components: rutile, titanium dioxide, potassium feldspar, mica, calcium carbonate, nitrogen containing ferrochromium, electrolytic manganese, metal nickel, ferrocolumbium, magnesium oxide, yttrium oxide, sodium fluosilicate, hydroxypropyl methyl cellulose, phenolic resin and melamine. According to the welding method, a welding process is simple, welding seam molding is beautiful, slag is easily separated and deposition efficiency is high; and the obtained welding seam metal has excellent mechanical performance and mechanical property.

Description

Technical field [0001] The invention relates to a welding method of stainless steel, and more specifically to a welding method of 12Cr5Mo martensitic stainless steel. Background technique [0002] 12Cr5Mo martensitic stainless steel has high temperature strength and high temperature oxidation resistance, and has good heat resistance and corrosion resistance in petroleum media. However, 12Cr5Mo martensitic stainless steel has poor weldability under the conditions of high temperature, high pressure, and strong corrosion resistance. Under the high temperature working environment of the device being put into operation, the brittleness of the weld may cause cracks in the pipeline weld, causing serious safety hazards. [0003] At present, in the construction process of the petrochemical installation project, the 12Cr5Mo pipeline welding has always adopted the same material welding method, that is, the R507 electrode with a chemical composition similar to the 12Cr5Mo steel base metal is u...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/167B23K9/235B23K33/00B23K35/30B23K35/365B23K103/04
CPCB23K9/00B23K9/167B23K9/235B23K33/004B23K35/3073B23K35/3608B23K35/365B23K2103/05
Inventor 刘翥刘军郭杨波殷宁宁岳波
Owner THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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