Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement

Patent metadata

Field	Value
Publication number	US-11446773-B2
Application number	US-201916706747-A
Country	US
Kind code	B2
Filing date	Dec 8, 2019
Priority date	Sep 11, 2017
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement, includes the following chemical components in percentage by mass: 0.04-0.1% of C, 0.4-1.5% of Mn, 7.5-12.5% of Ni, ≤0.5% of Si, 17.0-19.0% of Cr, ≤0.4% of Mo, 2.5-3.5% of Cu, 0.3-0.6% of Nb, 0.05-0.12% of N, ≤0.01% of S, ≤0.02% of P and the balance of Fe and other inevitable impurity elements. The welding wire can be used for welding of Super304H steel used in ultra super critical thermal power stations, has a weld being in a double-phase structure of austenite and a small amount of ferrite (volume fraction is 3-12%), and has good hot cracking resistance capability.

First claim

We claim:

1. A Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement, consisting of following chemical components in percentage by mass: 0.04-0.1% of C, 0.83-1.0% of Mn, 9.34-12.5% of Ni, ≤50.5% of Si, 17.0-19.0% of Cr, 0.05-0.2% of Mo, 2.5-3.5% of Cu, 0.3-0.6% of Nb, 0.05-0.12% of N, ≤0.01% of S, 0.014-0.02% of P and the balance of Fe and other inevitable impurity elements; wherein the Super304H steel welding wire forms a double-phase structure of austenite and ferrite: volume fraction of the ferrite in the double-phase structure is 3-12%.

2. The Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement according to claim 1 , wherein C: 0.06-0.08%.

3. The Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement according to any one of claim 1 , wherein a welding method used in application of the welding wire in Super304H steel welding is argon tungsten-arc welding.

4. The Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement according to claim 3 , wherein when the diameter of the welding wire is 1.0 mm, the welding current is 140-200 A, the arc voltage is 9-11V the wire feed speed is 85-350 mm/min, the protective gas flow is 16-20 L/min, and the interlayer temperature is controlled below 100° C.

5. The Super304H steel welding wire capable of resisting high-temperature creep and aging embrittlement according to claim 3 , wherein when the diameter of the welding wire is 2.4 mm, the welding current is 80-110 A, the arc voltage is 9-14 V, the welding speed is 50-100 nim/min, the protective gas flow is 8-10 L/min, and the interlayer temperature is controlled below 100° C.

Assignees

• Univ Wuhan
• Power China Henan Eng Co Ltd

Inventors

• Wang Xue
• Li You
• Chen Yucheng
• Chen Dongxu
• Sun Jianhua
• Li Liquan
• Guo Meihua

Classifications

• B23K35/0255

  for use in welding (B23K35/0205 takes precedence) · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title

• C22C38/02

  containing silicon · CPC title

• B23K35/0261 Primary

  Rods, electrodes or wires · CPC title

• C22C38/48

  with niobium or tantalum · CPC title