Welding method of 12cr5mo martensitic 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 less spatter, excellent quality Mechanical properties and mechanical properties, good effect of weld formation

Active Publication Date: 2018-06-05
THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 of 12cr5mo martensitic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] A welding method for 12Cr5Mo martensitic stainless steel, comprising 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 butted and assembled; and the groove is welded Pre-treatment of the groove: First, use 200-mesh sandpaper to polish the welded part of the groove for 40 seconds, then use 800-mesh sandpaper to polish the welded part for 20 seconds, and then put it in a degreasing agent to remove oil. The temperature of the degreasing agent is 30 ℃ , the degreasing time is 60s, and finally washed with water; the degreasing agent is composed of the following raw materials in parts by weight: 10 parts of sodium phosphate, 10 parts of sodium carbonate, 10 parts of OP-10, 20 parts of sodium silicate; Heating method for preheating, preheating is carried out evenly within the range of 100mm on both sides bas...

Embodiment 2

[0113] A welding method for 12Cr5Mo martensitic stainless steel, comprising the following steps:

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

Embodiment 3

[0156] A welding method for 12Cr5Mo martensitic stainless steel, comprising the following steps:

[0157] Step 1. Prepare the groove of 12Cr5Mo martensitic stainless steel, prepare the groove as a Y-shaped groove, the groove angle is 70°, the gap is 2.5mm, and the blunt edge is 1.2mm; then the groove is butted and assembled; Pre-treatment of the groove on the welded part: first use 300-mesh sandpaper to polish the welded part of the groove for 50 seconds, then use 900-mesh sandpaper to polish the welded part for 25 seconds, and then put it in a degreaser to remove oil. The temperature of the degreaser is 35°C, the degreasing time is 80s, and finally washed with water; the degreasing agent is composed of the following raw materials in parts by weight: 13 parts of sodium phosphate, 11 parts of sodium carbonate, 1.5 parts of OP-10, and 25 parts of sodium silicate; Preheating is carried out by flame heating method, and the preheating is carried out evenly within the range of 150mm...

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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 for stainless steel, in particular to a welding method for 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. When the device is put into production and operated in a high-temperature working environment, it may cause cracks in the pipe weld due to the brittleness of the weld, causing serious safety hazards. [0003] At present, in the construction process of petrochemical installation projects, 12Cr5Mo pipeline welding has been using the same material welding method, that is, R507 electrode welding with a chemical composition similar to that of the 12Cr5Mo steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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