Alloy725

HuaNickel Alloy725 is a nickel-chromium-molybdenum-niobium alloy that is corrosion-resistant and high-strength. It has essentially the same corrosion resistance as Inconel 625, and it is widely used in a wide range of severely corrosive environments. HuaNickel Alloy725 alloy properties are suitable for a range of applications that require excellent corrosion resistance and high strength.

Alloy725Chemical composition：

	Ni	Cr	Mo	Nb	Ti	AI	C	Mn	Si	P	S	Fe
Min	55.0	19.0	7.0	2.75	1.0							Bal
Max	59.0	22.5	9.5	4.0	1.7	0.35	0.03	0.35	0.20	0.015	0.010

Alloy725Physical properties：

Shear modulus	78
Young’s modulusGPa	204
Densityg/cm3	8.31
Poisson’s ratio	0.31
Melting point (°C)	1271-1343

Alloy725Mechanical properties：

Condition	Heat treatment or state	tensile strength Gb Mpa	Yield point Os Mpa	Elongation δ %	hardness HBW	Shock absorbs energyKV2J
roundwood roundwood Pipe	anneal Aging hardening Aging hardeningannealAging hardening	855 1241 1241 783 1268	427 917 903 334 921	57 30 31 60 27	Rc 53636 39	92 132

Alloy725Alloy properties：

Corrosion Resistance: The high nickel, chromium and molybdenum content allowsHuaNickel Alloy725 to be approved by NACE MR0175 for resistance to a wide range of corrosive properties in sour gas wells.

Oxidation resistance: Alloy725 alloy has excellent oxidation resistance and is able to resist oxidation and hot corrosion at high temperatures. This means that it effectively prevents oxidation processes under extreme conditions.

Alloy725Uses of alloys：

It is mainly used in aerospace, petrochemical and other fields. In the petrochemical industry, NCONEL 725 is widely used in superheater tubes, reheater tubes, steam pipes in large boilers and heat exchangers in the petrochemical industry due to its excellent corrosion resistance and high temperature performance. These devices need to be able to withstand extreme temperatures and pressures while maintaining material integrity and corrosion resistance.

Alloy725Process performance：

Welding Process: HuaNickel Alloy725 welded products, designated as filler metals, provide a higher strength alternative to alloy 625 weld wires. Gas tungsten arc welding and gas metal arc welding are the preferred methods for welding Alloy725.

Machining:HuaNickel Alloy725 is a hardenable alloy. Machining can be done under annealed or aging conditions.

Heat treatment: Alloy725 is strengthened by precipitation of the gammadiin (γ”) phase during aging heat treatment. Prior to aging, the material should be annealed at 1900°F (1040°C). Air cooling after solution annealing is the preferred cooling method. For sour gas applications, the recommended aging treatment is 1350°F (730°C)/8 hours/furnace cooled, 100°F (56°C)/hour to 1150°F (620°C)/8 hours/air cooled.

Relevant standards：

rods and wires, forgings- ASTM B 805，ASME2217 Bar- SMC HA91，ASME 2217