High-temperature-resistant and high-pressure-resistant high-alloy submerged arc welded steel pipe welding process

A welding process and high temperature resistant technology, which is applied in the submerged arc welding process of 2.25Cr-1Mo pearlitic heat-resistant alloy steel and the welding process of high alloy submerged arc welded steel pipes, can solve the problems of difficulty in welding and improve the welding seam. Quality, simple process, the effect of expanding the scope of application

Inactive Publication Date: 2019-03-12
HEFEI ZIKING PIPE INC
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Problems solved by technology

[0003] Due to the addition of alloying elements Cr and Mo, the 2.25Cr-1Mo pearlitic heat-resistant alloy steel material has a strong hardening tendency, and welding is difficult

Method used

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  • High-temperature-resistant and high-pressure-resistant high-alloy submerged arc welded steel pipe welding process
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  • High-temperature-resistant and high-pressure-resistant high-alloy submerged arc welded steel pipe welding process

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Embodiment Construction

[0019] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0020] 2.25Cr-1Mo steel longitudinal submerged arc welded steel pipe production process, step 1: 2.25Cr-1Mo large-diameter longitudinal submerged arc welded steel pipe with a specification of φ1219×30×12000mm passes ultrasonic non-destructive testing, machining groove, JCOE forming, processing into "O" shape,

[0021] Step 2: The steel pipe adopts the double-sided X-shaped groove type with the inner groove larger than the outer groove; the blunt edge is 4-5mm; the double-sided X-shaped groove is easy to machine edge milling, which improves production efficiency;

[0022] Step 3: Preheat the steel pipe to 200°C before welding;

[0023] Step 4: Welding with straight seam submerged arc welding technolog...

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Abstract

The invention discloses a high-temperature-resistant and high-pressure-resistant high-alloy submerged arc welded steel pipe welding process, and relates to the field of submerged arc welding. A steelplate is formed by ultrasonic nondestructive inspection, mechanical machining of a groove and JCOE forming and is machined into an O shape; the steel pipe adopts a double-sided X-shaped groove type with an inner groove larger than the outer groove; the double-sided X-shaped groove is easy to mechanically milling, so that the production efficiency is improved; the steel pipe is preheated to 200 DEGC before welding; and a straight seam submerged arc welding technology is adopted for welding, after the welding is finished, the steel pipe is heated to 300-400 DEG C, and heat preservation is carried out for 1 hour. The types of the straight seam submerged arc welding steel pipe materials are enriched, the production efficiency is improved, the application range of the large-opening straight seam submerged arc welding steel pipe is expanded, and the performance of the large-opening thick-wall single-wire submerged arc welded steel pipe is greatly improved.

Description

technical field [0001] The invention relates to a high-alloy submerged-arc welding steel pipe welding process for high-temperature and high-pressure resistance, in particular to a submerged-arc welding process for 2.25Cr-1Mo pearlitic heat-resistant alloy steel, which belongs to the field of submerged arc welding. Background technique [0002] 2.25Cr-1Mo pearlitic heat-resistant alloy steel is a heat-strength steel and hydrogen-resistant steel widely used in the world. Due to the addition of alloying elements such as Cr and Mo in low carbon steel, the comprehensive performance of the steel is greatly improved. For example, it has good high-temperature mechanical properties, high-temperature oxidation resistance, corrosion resistance, good toughness, process performance and weldability, so it is widely used in the manufacture of petrochemical, coal conversion, nuclear power, steam turbine cylinder, thermal power and other operating conditions Large-scale equipment with harsh...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/23B23K9/235B23K101/06
CPCB23K9/18B23K9/23B23K9/235
Inventor 彭静吴宏根葛兰李勇王云飞
Owner HEFEI ZIKING PIPE INC
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