Solid solution strengthened heat-resistant alloy c-hra-2 welding wire for argon arc welding

A C-HRA-2, heat-resistant alloy technology, applied in welding equipment, welding medium, metal processing equipment, etc., can solve the problems of poor matching of chemical composition and mechanical properties of deposited metal, and achieve excellent welding process performance. Good physical and weld formability

Active Publication Date: 2022-03-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above-mentioned welding wire has insurmountable technical problems such as poor matching between the chemical composition and mechanical properties of the deposited metal and the pure solid solution strengthened heat-resistant alloy C-HRA-2.

Method used

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  • Solid solution strengthened heat-resistant alloy c-hra-2 welding wire for argon arc welding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition and weight percentage of welding wire are: C: 0.05%; Si 0.9%; Mn 0.9%; P 0.015%; S0.001%; ​​Cr: 22%; Co: 14%; Mo: 8.8%; W: 1.0%; N 0.0018%; O 0.0015%; the balance is Ni and unavoidable impurity elements. In this embodiment, the welding wire is welded by manual argon arc welding, the specification of C-HRA-2 alloy tube: Φ44.5×10mm, the back of the tube is protected by high-purity argon (≥99.99%), the gas flow rate is 10L / min, and the flow rate of welding torch shielding gas 8L / min; welding wire specification: Φ2.4mm, welding parameters: welding current 130A, arc voltage 13V, preheating temperature 100°C, interpass temperature 100°C; no post-weld heat treatment. The radiographic flaw detection of the welded joint is 100% qualified, and the mechanical properties of the weld metal are: impact energy at room temperature 115J; tensile strength at room temperature 780MPa, yield strength 465MPa.

Embodiment 2

[0026] The chemical composition and weight percentage of welding wire are: C: 0.10%; Si 0.3%; Mn 0.6%; P 0.010%; S0.001%; ​​Cr: 20%; Co: 10%; Mo: 8.1%; W: 0.5%; N 0.0015%; O 0.002%; the balance is Ni and unavoidable impurity elements. In this embodiment, the welding wire is welded by manual argon arc welding, the specification of C-HRA-2 alloy tube: Φ44.5×10mm, the back of the tube is protected by high-purity argon (≥99.99%), the gas flow rate is 10L / min, and the flow rate of welding torch shielding gas 9L / min; welding wire specification: Φ2.4mm, welding parameters: welding current 110A, arc voltage 14V, preheating temperature 100°C, interpass temperature 100°C; no post-weld heat treatment. The radiographic flaw detection of the welded joint is 100% qualified, and the mechanical properties of the weld metal are: impact energy at room temperature 125J; tensile strength at room temperature 775MPa, yield strength 465MPa.

Embodiment 3

[0028] The chemical composition and weight percentage of welding wire are: C: 0.08%; Si 0.5%; Mn 0.6%; P 0.010%; S0.001%; ​​Cr: 21%; Co: 12%; Mo: 8.5%; W: 0.5%; N 0.0019%; O 0.002%; the balance is Ni and unavoidable impurity elements. In this embodiment, the welding wire is welded by narrow gap hot wire TIG welding, the specification of C-HRA-2 alloy tube: outer diameter Φ510mm×wall thickness 85mm, welding wire specification: Φ1.6mm, welding parameters: bottoming parameters: current 120A, voltage 10V, send Wire speed 70cm / min, welding speed 110mm / min, shielding gas is high-purity argon (≥99.99%), flow rate 25L / min; filling parameters: current 150A, voltage 11V, wire feeding speed 90cm / min, welding speed 70mm / min, the shielding gas is high-purity argon (≥99.99%), the flow rate is 27L / min; cover parameters: current 170A, voltage 10V, wire feeding speed 70cm / min, welding speed 50mm / min, shielding gas is high-purity argon (≥99.99%), the flow rate is 30L / min. The interpass tempe...

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Abstract

The invention discloses a welding wire for argon arc welding of a solid solution strengthened heat-resistant alloy C-HRA-2, which belongs to the technical field of heat-resistant alloy welding materials. The weight percentage of welding wire composition is: C:0.06-0.12%; Si<1.0%; Mn<1.0%; P≤0.015%; S≤0.001%; ​​Cr:20-22%; Co:10-13%; Mo:8.1 ‑8.8%; W: 0.1‑1.0%; N≤0.0025%; O≤0.0025%; the balance is Ni and unavoidable impurity elements. The advantage is that the sensitivity to thermal crack resistance is increased by 90%, and the welding strain aging cracks of this type of alloy are fundamentally eliminated. It has excellent physical and mechanical properties and excellent impact toughness matching the base metal. The seam metal has good fluidity, good weld formability, and the production cost is 10‑15% lower than that of the existing ERNiCrCoMo‑1 welding wire.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular provides a solid solution strengthened heat-resistant alloy C-HRA-2 welding wire for argon arc welding, which is suitable for manual argon arc welding / semi-automatic welding of new heat-resistant alloy C-HRA-2 Argon arc welding or narrow gap hot wire TIG welding for priming or filling. Background technique [0002] Improving the steam parameters (temperature and pressure) of thermal power units is the most important way to improve the thermal efficiency of coal-fired power generation and realize coal saving and emission reduction. However, the biggest "bottleneck" problem that restricts the development of thermal power units to higher parameters is higher-grade heat-resistant materials and their engineering welding. The 630°C ultra-supercritical coal-fired power station in Yuncheng, Shandong Province of Datang is the world's first thermal power unit with the highest s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
CPCB23K35/304
Inventor 陈正宗刘正东梁宝琦包汉生何西扣王立民杨钢
Owner CENT IRON & STEEL RES INST
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