Specifications

1.High level of resistance to various forms of corrosion
2.High temperature resistant
3.Diameter: 0.05mm-10.0mm

General scope

 

Alloy 725 is highly resistant to corrosion and is age hardenable for extremely high strength. It is used in a broad range of severe corrosive environments. The strength of age-hardened A725 is twice that of A625 annealed. Strength in A725 is obtained by heat treatment and can also be cold worked for even higher strength. There is also a high resistance in reducing and oxidizing environments and increased resistance to pitting and crevice corrosion in sea water and stress corrosion cracking.

 

Due to outstanding corrosion resistance and high strength, applications for this alloy are used for hangers, side pocket madrels, springs and polished bore receptacles for sour gas service. The petrochemical and processing industries are good candidates for this alloy. A725 is also used for high strength fasteners in marine applications to resist corrosion, pitting and crevice attack in sea water.

 

A hardness level of 43 HRC max. is allowed in NACE MR0175 when elemental sulphur is not present.

 

tmospheres. The high Nickel content also gives resistance to chloride ion stress-corrosion cracking. Pitting and crevice corrosion resistance is also excellent. The alloy is produced by a vacuum remelt process, but can be supplied using an air melt single consumable electrode (VAR or ESR) practice if the material specification allows.

 

 

 

Alloy 725 (UNS N07725) is a nickel-chromium-molybdenum-niobium alloy that is highly resistant to corrosion and has been age hardened for extremely high strength twice that of annealed alloy 625.  Alloy 725 strength is developed by heat treatment rather than by cold work this also enables strength to be imparted to large non-uniform sections that cannot be strengthened by cold works. Alloy 725 is used for hangers, landing nipples and high strength fasteners in marine applications.

 

 

Chemical composition

 

	C	Si	Mn	P	S	Cr	Ni	Mo	Nb(Cb)	Ti	Al	Fe
Min	•	•	•	•	•	19.00	55.0	7.00	2.75	1.00	•	Bal.
Max	0.03	0.20	0.35	0.015	0.010	22.50	59.0	9.50	4.00	1.70	0.35	(8.5%)

 

 

Mechanical properties

Condition: Solution Annealed and Age Hardened (Minimum values)

U.T.S.	150 KSI min
0.2% Proof Stress	120 KSI min
Elongation	20%
NACE MR0175 limits the supply hardness to 43 HRC max. *

Condition: Solution Annealed and Age Hardened (Maximum values)

U.T.S.	150 KSI min
0.2% Proof Stress	140 KSI min
Elongation	20%
NACE MR0175 limits the supply hardness to 43 HRC max. *
Size range: 1”∅ - 9”∅