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Submerged arc welding method of low mo refractory steel

A submerged arc welding and refractory technology, applied in welding equipment, welding medium, welding equipment and other directions, can solve the problems such as the inability to stably meet the technical requirements of new refractory steel welded joints, the submerged arc welding process unable to meet the requirements, and the increase of Nb content. Achieve the effect of benefiting residents' safety, saving Mo metal resources, and reducing economic losses

Active Publication Date: 2022-03-01
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the reduction of Mo content and the increase of Nb content in the new refractory steel, the current submerged arc welding process suitable for traditional refractory steel cannot meet the requirements
Welding defects are easy to occur when traditional refractory steel submerged arc welding process is used, and it cannot stably meet the technical requirements of new refractory steel welded joints

Method used

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  • Submerged arc welding method of low mo refractory steel
  • Submerged arc welding method of low mo refractory steel
  • Submerged arc welding method of low mo refractory steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Submerged arc welding is carried out on the new low-Mo refractory steel Q390FRE grade steel with a specification of 15mm, and the welding position is horizontal welding.

[0037] (1) using such as figure 2 As shown in the V-shaped welding groove, the groove angle is 30° on one side, 2mm-3mm blunt edge is left at the root, and 4-6° anti-deformation is reserved when the steel plate is assembled;

[0038] (2) For the Q390FRE steel plate, Harbin Well Welding submerged arc welding wire H390FRΦ4.0 and submerged arc flux SJ18 are mainly used, while in step (4) for bottom welding, Harbin Weil Welding gas shielded welding wire HS390FRΦ1.2 is used; The coordination of several welding materials fully meets the requirements of the present invention for welding deposited metal components;

[0039] (3) The steel plate is preheated at 40°C;

[0040](4) Carry out 2 rounds of bottom welding on the steel plate, using the gas shielded welding method. The first welding curre...

Embodiment 2

[0061] Example 2: Submerged arc welding is performed on the new low-Mo refractory steel Q420FRE grade steel with a specification of 30 mm, and the welding position is flat welding.

[0062] (1) According to the thickness, such as image 3 For the X-shaped welding groove shown, the groove angle is 30° on one side, and the root is left with a blunt edge of 1-2mm;

[0063] (2) The Q420FRE steel plate mainly uses Harbin Well Welding submerged arc welding wire H460FRΦ4.0 and submerged arc flux SJ18, and in step (4) for back welding, Harbin Weil Welding gas shielded welding wire HS460FRΦ1.2 is used; The matching of welding materials fully meets the requirements of the present invention for welding deposited metal components;

[0064] (3) The steel plate is preheated at 100°C;

[0065] (4) Carry out 3 rounds of bottom welding on the steel plate, using the gas shielded welding method. The first welding current is 210~230A, the welding voltage is 23~25V, the welding speed is 23~25cm...

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Abstract

The invention provides a submerged arc welding method for low-Mo refractory steel, which belongs to the technical field of metal welding. This method provides a suitable submerged arc welding process for Q345FRE, Q390FRE, Q420FRE, Q460FRE four grades of low-Mo new refractory steel, ensuring that the qualified rate of welded joints is over 98%, effectively reducing the frequency of repairs, reducing economic losses, and improving engineering efficiency. . And according to the characteristics of the new low-Mo refractory steel, different specifications and different preheating methods are adopted to reasonably control the preheating cost; at the same time, the upper limit of the interpass temperature is given to maximize work efficiency and shorten the construction period. The submerged arc welding is the main method, and the gas shielded welding method is used to ensure the quality of the welded joints, so that the welded joints can meet the performance requirements. Satisfy the fire-resistant performance, promote the popularization and application of low-Mo new fire-resistant steel, effectively save Mo metal resources, reduce construction costs, and be conducive to safety.

Description

technical field [0001] The invention relates to a welding method, in particular to a submerged arc welding method for low Mo refractory steel. Background technique [0002] The fire-resistant steel for construction can keep the yield strength at more than 2 / 3 of the room temperature within 30 minutes at a high temperature of 600 °C. Compared with the current ordinary steel used in construction (which needs to be coated with a certain thickness of fireproof layer), the use of fire-resistant steel can effectively reduce the thickness of the fireproof layer or even avoid fireproof coating, which greatly saves material costs and is environmentally friendly, with broad application prospects. Traditional refractory steel uses Mo alloying to ensure the high temperature performance of the steel, so the steel plate has a high content of Mo, which is expensive. Nanjing Iron and Steel Co., Ltd. used Nb to partially replace Mo to strengthen the steel plate, improve its high temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/23B23K9/235B23K35/30
CPCB23K9/18B23K9/23B23K9/235B23K35/3073
Inventor 李伟范益尹雨群王晓斌李定金
Owner NANJING IRON & STEEL CO LTD
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