High heat resistance welding wire for dissimilar steel welding joints

A technology for welding joints and dissimilar steels, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of insufficient high temperature permanent fracture strength, carbon migration, large joint structure, mechanical property gradient, etc., and achieve good The effect of high temperature permanent rupture strength

Inactive Publication Date: 2019-12-10
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a high thermal strength welding wire for welding joints of dissimilar steels, which can effectively solve the problems of martensitic heat-resistant steel and bainitic heat-resistant steel in the prior art. Problems in the connection: one is the serious carbon migration problem caused by the use of 2.25% Cr welding consumables, which leads to a large gradient in the structure and mechanical properties of the joints; the other is the use of 5Cr0.5Mo welding consumables specified by ASME for high temperature and long-lasting The problem of insufficient breaking strength

Method used

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  • High heat resistance welding wire for dissimilar steel welding joints
  • High heat resistance welding wire for dissimilar steel welding joints
  • High heat resistance welding wire for dissimilar steel welding joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] According to the welding wire formula provided in the present invention, a welding wire sample 1# was prepared, and the welding wire formula is shown in Table 2. Welding wire sample 1# is used for welding 9% Cr martensitic heat-resistant steel and 2% Cr bainitic heat-resistant steel, the schematic diagram and local microstructure of the welded joint are shown in figure 2 . The post-weld heat treatment condition is to keep warm at 655-675°C for 20 hours. Depend on figure 2 It can be seen that compared to figure 1 , the dissimilar steel welded joint made by the welding wire of the present invention, the carbon migration phenomenon on the 9% Cr martensitic heat-resistant steel side is significantly improved, the carbon migration degree of the welded joint is significantly reduced, and the composition and structure of the entire welded joint change gradient Reduced, which has a significant effect on improving the high-temperature enduring strength and toughness of the ...

Embodiment 2

[0046] According to the welding wire formula provided in the present invention, welding wire samples 2#, 3#, and 4# were prepared, and the welding wire formula is shown in Table 3. Welding wire samples 2#, 3#, and 4# are used for welding 9% Cr martensitic heat-resistant steel and 2% Cr bainitic heat-resistant steel. The post-weld heat treatment conditions for welding wire samples 2#, 3#, and 4# are at 655-675°C for 20 hours. In the dissimilar steel welded joints produced by welding wire samples 2#, 3#, and 4# in the present invention, the carbon migration phenomenon on the 9% Cr martensitic heat-resistant steel side is significantly improved, and the carbon migration degree of the welded joints is significantly reduced. The change gradient of composition and structure of the whole welded joint is reduced, which has a significant effect on improving the high-temperature durable strength and toughness of the joint.

[0047] Table 3 Chemical Composition of Welding Wire Samples 2...

Embodiment 3

[0050] The weld metal of the dissimilar steel welded joint manufactured using the 5Cr0.5Mo welding wire specified by ASME and the weld metal of the joint in Example 1 are subjected to high-temperature endurance strength tests respectively, and the test results under different temperature and stress combination parameters are summarized in image 3 ,Depend on image 3 It can be seen that the welding wire sample 1# (5Cr1Mo series) prepared in the present invention has higher thermal strength, which is obviously better than 5Cr0.5Mo welding wire.

[0051] In summary, the present invention provides a high thermal strength welding wire for dissimilar steel welding joints, which is a 5Cr1Mo type high thermal strength welding wire, mainly used to connect 9% Cr martensitic heat-resistant steel and 2% Bainite Body heat-resistant steel. Compared with the dissimilar steel joint using 2.25% Cr welding material, the dissimilar steel joint manufactured by using the welding wire provided by...

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Abstract

The invention provides a high heat resistance welding wire for dissimilar steel welding joints, which is composed of the following elements in weight percent: C: 0.08-0.20%; Si: 0.02-0.30%; Mn:0.40-1.00%; Ni:0.10-0.30%; P less than or equal to 0.0090%, S less than or equal to 0.0090%; Cr:4.50-5.50%; Mo:0.80-1.30%; V: 0.10-0.40%; Al less than or equal to 0.050%; N: 0.010-0.090%; Nb: 0.010-0.070%; and the balance of Fe. The invention further provides a preparation method for a highheat resistance welding wire and application thereof to dissimilar steel welding joints. The highheat resistance welding wire provided by the invention has good heat resistance, and can reduce contents, structure and mechanical property gradient of the dissimilar steel welding joints.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to a high thermal strength welding wire used for welding joints of dissimilar steels. Background technique [0002] A large number of high-temperature components of thermal power and nuclear power will involve the welding connection of dissimilar steels in the manufacturing process. It can be called dissimilar steel welded joints, among which the welded joints between low-alloy bainite heat-resistant steel and high-alloy martensitic heat-resistant steel are more common dissimilar steel welded joints in power generation, petroleum, and chemical industries. The main alloying element Cr content (mass fraction, the same below) in low-alloy bainitic heat-resistant steel is about 2%, while that in high-alloy martensitic heat-resistant steel is about 9%. The large Cr element content gradient between species poses a great challenge for the selection of welding materials. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/40
Inventor 李克俭王朋霍鑫范曼杰蔡志鹏李轶非
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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