Nickel and nickel alloys · Сплав А494 Grade CW6MC / SА494 Grade CW6MC / N26625
Cast Alloy ASTM A494 Grade CW6MC: Engineering Reference
Engineering Specifications of ASTM A494 Gr CW6MC Alloy
Cast nickel-chromium alloy CW6MC, supplied by EV Group China, is a high-performance material designed for critical pipeline system components. The alloy demonstrates outstanding resistance to high-temperature oxidation and stress corrosion cracking in aggressive industrial environments. Its composition is the cast equivalent of wrought Inconel 625 alloy.
| Regulatory Standard | Material Classification | Key Applications | EU Standard Equivalents |
|---|---|---|---|
| ASTM A494 – Specification for Castings, Nickel and Nickel Alloy | Highly alloyed chromium-nickel cast alloy (Inconel 625 analogue) | Manufacturing of cast components: valve bodies, pumps, flanges, and fittings for oil and gas, chemical, and energy industries. | 2.4856, N06625, NiCr22Mo9Nb |
| ASTM A494 – Specification for Castings, Nickel and Nickel Alloy | Highly alloyed chromium-nickel cast alloy (Inconel 625 analogue) | Manufacturing of cast components: valve bodies, pumps, flanges, and fittings for oil and gas, chemical, and energy industries. | 2.4856, N06625, NiCr22Mo9Nb |
Normalized Chemical Composition of CW6MC Alloy (%) according to ASTM A494
The balanced alloying with molybdenum and niobium forms a matrix that provides excellent mechanical strength and high resistance to localized pitting and crevice corrosion. EV Group China guarantees full compliance of the chemical composition with the requirements of the ASTM A494 specification.
| C | <0.06 |
|---|---|
| Si | <1.0 |
| Mn | <1.0 |
| P | <0.015 |
| S | <0.015 |
| Mo | 8.0–10.0 |
| Fe | <5.0 |
| Cr | 20.0–23.0 |
| Cb (Nb) | 3.15–4.5 |
| Ni | Balance |
Mechanical Properties of A494 Gr CW6MC Alloy at Room Temperature
Minimum standardized mechanical property values ensure reliable operation of CW6MC alloy castings across a wide range of loads, including high-pressure conditions and cryogenic temperatures down to -196°C.
| Tensile Strength (Rm), min., MPa | Yield Strength (Rp0.2), min., MPa | Elongation after fracture (A), min., % |
|---|---|---|
| 485 | 275 | 25 |
Key Physical Properties of CW6MC Alloy
The density of alloy A494 Gr CW6MC (SA494 Gr CW6MC) is 8.54 g/cm³. This parameter, combined with the austenitic FCC (face-centered cubic) structure, ensures high dimensional and shape stability of products under cyclic temperature exposures.
Processability and Weldability of the Material
CW6MC alloy exhibits good weldability with all major arc welding methods and excellent machinability. For the qualification of welding procedures according to international standards, the following classification data are used:
| Weldability and Certification | According to ISO 15608 | ASME Section IX | |
|---|---|---|---|
| Weldability and Certification | Group 43 | Welding | Brazing |
| Weldability and Certification | Group 43 | P-Number: 43 | P-Number: 111 |
Correlation with International Standards and Equivalents
The broad nomenclature of CW6MC alloy equivalents in various international standardization systems (ASTM, DIN, JIS, GB) simplifies the integration of the material into global engineering projects and ensures interchangeability of components.
| Germany (DIN) | Japan (JIS) | Great Britain (BS) | USA (ASTM/ASME) | China (GB) |
|---|---|---|---|---|
| 2.4831, 9.4856 | YNiCrMo-3, SNi6625, NAS 625 | 625, AMI 2.4856, NA 21, NA43 | RN625, 7490 M, 5401, A 781 Grade CW6MC | 0Cr20Ni65Mo10Nb4, GH3625, NS336 |