Alloy 925 (UNS N09925)

Alloy 925

Alloy 925 (UNS N09925) is an age-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. 925 is used in numerous applications requiring a combination of high strength and corrosion resistance.  The nickel, in conjunction with molybdenum and copper, provides excellent resistance to reducing chemicals and its chromium content renders protection in oxidizing environments.  Because of its resistance to sulfide stress cracking and stress-corrosion cracking in sour crude oil and natural gas, it is used for down-hole and surface gas well components including but not limited to: packers, pump shafts in marine environments, safety valves, hangers, landing nipples and fasteners.

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Alloy 925 Specification/Condition

• API 6ACRA / NACE MR0175, UNS N09925

Alloy 925 Applications

• Packers
• Safety valves
• Hangers
• Marine and pump shafting
• Landing nipples
• Fasteners

Alloy 925 Technical Data

• UTS (KSI): 140 Min
• Yield 0.2% Offset (KSI): 110 Min
• EL (% Min): 18
• RA (% Min): 25
• Hardness (HRC): 26-38
• Charpy Impact Min. ft-lbs: 35 @-75°F

Stocking Dimensions

• Bar: 0.5 – 12.0 dia
• Bored Bar with bespoke internal diameters via vSM’s in-house deep hole drilling and honing capabilities

 

Alloy 925 Chemical Composition (Wt %)

 

Carbon (C)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)	Silicon (Si)	Nickel (Ni)	Cobalt (Co)
0.025 Max	0.5% – 0.9% Max	0.02 Max	0.003 Max	0.35 Max	42% – 46%	–

 

Chromium (Cr)	Molybdenum (Mo)	Niobium + Tantalum (Nb (Cb) + Ta)	Titanium (Ti)	Copper (Cu)	Aluminum (Al)	Iron (Fe) & Others
19.5% – 22.5%	2.50% – 3.50%	0.08% – 0.50%	1.90% – 2.40%	1.5% – 3.00%	0.10% – 0.50%	Min 22% Balance