SS Welding Wire EC410NiMo

EC410NiMo is a metal-cored or solid welding wire conforming to AWS A5.22 standards. Its weld metal composition is approximately 13% Cr, 4% Ni, and 0.4-0.5% Mo, belonging to the soft martensitic/ferritic stainless steel system.

This welding wire is specifically designed for welding and repairing 13%Cr-4%Ni-Mo materials (such as CA6NM castings). It has extremely low diffusible hydrogen content (≤4ml/100g), effectively preventing cold cracking and exhibiting excellent resistance to cavitation erosion, stress corrosion, and impact toughness.

It is typically used with GMAW (gas shielded welding) or SAW (submerged arc welding) processes, with recommended shielding gases of 98%Ar + 2%O₂ or 96%Ar + 4%O₂. It is suitable for all-position welding and is mainly used in the manufacturing and repair of critical components of hydroelectric power generation equipment such as turbine blades and runners.

Key Characteristics

• Composition: Approximately 13% Cr, 4% Ni, and 0.4% Mo. Low carbon content ensures the toughness and crack resistance of the weld metal.
• Hardness: As-welded hardness is approximately 35-42 HRC, adjustable after heat treatment.
• Process: Suitable for GMAW (Gas Shielded Welding) and SAW (Submerged Arc Welding). Can be welded in all positions. Recommended shielding gas is 98% Ar + 2% O₂ or 96% Ar + 4% O₂.
• Crack Resistance: Extremely low diffusible hydrogen content (≤4ml/100g), effectively preventing cold cracking.

Typical Applications

Hydropower equipment such as turbine runners and blades (Pelton, Francis, Kaplan turbines).

Components requiring corrosion resistance, cavitation resistance, and wear resistance, such as compressors, valves, and pump bodies.

Welding Recommendations

• Preheating temperature: Typically 100–150℃ (up to 300℃ for thicker parts).
• Interpass temperature: Keep below 170℃ to avoid overheating.
• Post-weld heat treatment: Annealing at 580–620℃ is recommended to improve toughness and reduce residual stress.

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