Alloy740

HuaNickel Alloy740 alloy is a nickel-based superalloy that can maintain good mechanical properties and oxidation resistance in high-temperature environments. The alloy is also widely used in aerospace, energy, and chemical industries, especially in the manufacture of high-temperature components and structures. Its physical properties include excellent resistance to high-temperature corrosion, good oxidation resistance, and good resistance to coal ash corrosion.

Alloy740Chemical composition：

C	Si	Fe	Mn	Nb	Ti	Al	Co	Mo	Cr	Ni
0.03	Bal	25.0	0.5	20.0	0.9	1.8	2.0	0.30	0.7	0.5

Alloy740Physical properties：

Densityg/cm3	8.05
Melting temperature range℃	1288～1362
ResistivityΩ.m	1.168

Alloy740Mechanical properties：

Condition	anneal	Aging at 1400F (760°C):
		1 hour	2 hour	4 hour	8 hour	16 hour
Yield strength
(MPa)	407	821	841	862	889	883
(ksi)	59	119	122	125	129	128
tensile strength
(MPa)	896	1241	1255	1269	1276	1276
(ksi)	130	180	182	184	185	185
Elongation（%）	50.3	34.6	34.3	33.7	31.9	29.5

Alloy740Alloy properties：

High temperature resistance:

HuaNickel Alloy740 alloy has excellent high temperature resistance, which makes it ideal for use in high temperature environments, such as ultra-supercritical power plant boiler superheaters, reheaters, etc.

Corrosion resistance: Alloy 740 has good corrosion resistance at high temperatures.

Oxidation resistance: The alloy has good oxidation resistance, which is especially important under high-temperature operating conditions, where oxidation can lead to a decrease in material properties. In static air at 950°C, the oxidation kinetics of

HuaNickel Alloy740 alloy follow a parabolic pattern, and the oxide film formed on the surface is intact, helping to protect the material from further corrosion.

Stability: Alloy740 alloy is able to form gamma primary and secondary phases at high temperatures, thereby improving its overall microstructure stability.

Carburizing resistance: Alloy740 alloy exhibits good carburizing resistance at high temperatures.

Alloy740Uses of alloys：

The high-temperature performance and corrosion resistance of Alloy740, an alloy that is widely used in aerospace, energy (especially power plants), chemical industry, and other industries for the manufacture of high-temperature components and structures. Alloy740 alloy is a high-performance nickel-based alloy for extreme high-temperature environments, and its excellent high-temperature corrosion resistance, oxidation resistance, and mechanical properties make it excellent in multiple high-temperature applications.

Alloy740Process performance：

Welding process: Alloy740 alloy can be welded using gas tungsten arc welding technology. This method is suitable for nickel-based alloys.

Manufacturing process: The mechanical properties and corrosion resistance of materials can be further improved by improving casting processes, such as lost-wax casting, and by precisely controlling the deposition of carbonization at grain boundaries.

Heat treatment:

Solution Treatment: Alloy740H alloy is first solution treated, typically at 1150°C for 30 minutes, followed by water or air cooling.

Ageing: After solution treatment, the alloy is aged to further optimize its microstructure and mechanical properties. The specific steps are as follows:

Standard aging treatment includes 16 hours at 800°C. Aging can be performed with single or double aging to further refine γ phase particles.

Relevant standards:

Relevant standards：

Pipes, weldingASME Section I, VIII  ASME Code Case 2702