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Welding technique of G115 steel used for boiler pipelines

A welding process and pipeline technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of high temperature, durable strength and low use requirements of welded joints

Active Publication Date: 2017-05-17
SHANGHAI BOILER WORKS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are still some unresolved problems in the welding of SAVE12AD, a candidate heat-resistant steel for 630°C ultra-supercritical boilers developed by Sumitomo, Japan. The welding of SAVE12AD materials is recommended to be welded with Gr.92 grade or nickel-based welding consumables internationally. , the high-temperature durability strength of the welded joint is lower than the requirements of the relevant standards for the use of the base metal

Method used

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Embodiment Construction

[0015] In order to make the present invention more comprehensible, preferred embodiments are described in detail as follows.

[0016] The invention provides a welding process of G115 steel for boiler pipes, comprising the following steps:

[0017] Step 1. The pipeline is prepared by using the G115 new martensitic heat-resistant steel supplied in the normalized + tempered state.

[0018] Step 2. Preparation before welding: ① Prepare the groove, and clean the groove and both sides of the inner and outer walls by grinding; ② Assemble the two pipes to be welded.

[0019] Step 3. Use manual argon arc welding + manual arc welding (GTAW+SMAW) for welding, choose Φ2.4mm 9Cr-3W-3Co heat-resistant steel strip welding wire (GTAW), Φ3.2~Φ4.0mm 9Cr- 3W-3Co heat-resistant steel electrode. Manual argon arc welding + manual arc welding (GTAW+SMAW) welding process is as follows:

[0020] ① The protective gas on the outer wall of the pipeline is protected by 100% Ar, and the protective gas f...

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Abstract

The invention discloses a welding technique of G115 steel used for boiler pipelines. The welding technique is characterized by comprising the following steps that the pipelines are prepared from G115 novel martensitic heat-resistant steel supplied in the normalized condition and the tempering condition; beveled edges are prepared in the two pipelines needing to be welded correspondingly, through polishing, the beveled edges and the two sides of the inner walls and the outer walls of the beveled edges are cleared, and then the two pipelines needing to be welded are subjected to aligned assembly; manual argon arc welding and manual electric-arc welding are adopted to conduct welding; and after butt girth welding is conducted, heat treatment is conducted at the temperature of 760-780 DEG C, and the heat preservation time is seven hours or more. According to the welding technique of the G115 steel used for the boiler pipelines, the problems that which welding material is adopted for welding of the G115 steel and how heat treatment is conducted after the G115 steel is welded are solved, and the welding technique of the G115 novel martensitic heat-resistant steel is completely provided and has great significance for reference on solving the welding problem of the same martensitic heat-resistant steel.

Description

technical field [0001] The invention relates to a welding process for on-site assembly of new-type martensitic G115 steel for ultra-supercritical boiler pipes with a unit parameter of 630°C and above. Background technique [0002] G115 is a 9Cr-3W-3Co new type of martensitic heat-resistant steel developed by Beijing Iron and Steel Research Institute. Durable strength is better than P93 steel developed by Sumitomo, Japan. The G115 material can meet the service requirements at 650°C, and has great potential to become steel for boiler pipes in the temperature range of 630°C to 650°C. [0003] At present, there are still some unresolved problems in the welding of SAVE12AD, a candidate heat-resistant steel for 630°C ultra-supercritical boilers developed by Sumitomo, Japan. The welding of SAVE12AD materials is recommended to be welded with Gr.92 grade or nickel-based welding consumables internationally. , the high-temperature enduring strength of the welded joint is lower than t...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K9/173B23K9/235
CPCB23K9/173B23K9/235B23P15/00
Inventor 陈亮李刚卢征然陆文龙王炯祥傅育文王哮江田国平
Owner SHANGHAI BOILER WORKS
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