ER630 is a precipitation-hardening, martensitic stainless steel filler metal (like 17-4 PH) used for welding similar high-strength stainless steels, offering excellent mechanical properties that can be further enhanced by post-weld heat treatments (like solution treating and aging) to achieve high strength, making it ideal for parts like valves, gears, and fasteners.
Key Characteristics:
Type: Precipitation-Hardening (PH) Stainless Steel (often referred to as 17-4 PH).
Classification: AWS A5.9 ER630.
Purpose: To weld materials of similar composition, such as ASTM A564 Type 630, for applications requiring high strength and good corrosion resistance.
Microstructure: Modified to prevent undesirable ferrite formation, maintaining good mechanical properties in the martensitic structure.
Versatility: Can be used in the as-welded condition or heat-treated (solution treated and aged) to significantly increase strength and hardness.
Applications:
Valves, fasteners, gears, propeller shafts, and roller chain pins.
Benefits:
High strength in the heat-treated condition.
Good corrosion resistance.
In essence, ER630 provides a strong, reliable weld for demanding stainless steel applications where strength is critical.
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