Nickel and nickel alloys · Сплав А494 Grade CW2M / SА494 Grade CW2M / N26455
Alloy A494 Gr CW2M: Engineering Reference Guide for Cast Nickel Alloy
Engineering and Technical Parameters of Cast Alloy A494 Gr CW2M / SA 494 Gr CW2M
Alloy CW2M is a cast nickel material, alloyed with chromium and molybdenum, with precisely controlled, ultra-low carbon content. This composition ensures excellent resistance to corrosive processes in highly aggressive industrial environments. EV Group China engineers use this alloy to manufacture critical components operating in contact with both strong oxidizers and reducing agents.
| Standard | Classification | Areas of Application |
|---|---|---|
| ASTM A494 – Specification for Castings, Nickel and Nickel Alloy | Corrosion-resistant cast nickel alloy | Manufacturing of shaped castings: pump casings, valves, shut-off valves, fittings, and flanges for systems operating with aggressive chemicals and in oil refining. |
| ASTM A494 – Specification for Castings, Nickel and Nickel Alloy | Corrosion-resistant cast nickel alloy | Manufacturing of shaped castings: pump casings, valves, shut-off valves, fittings, and flanges for systems operating with aggressive chemicals and in oil refining. |
Chemical Composition of Grade CW2M Alloy according to ASTM A494 (%)
The precise balance of alloying elements in the CW2M alloy is a key factor in preventing intergranular corrosion (ICC) and pitting in welded joints and the heat-affected zone. The chemical composition of each melt is controlled in accredited EV Group China laboratories using spectral analysis to ensure full compliance with ASTM A494 requirements.
| C | <0,02 |
|---|---|
| Si | <0,8 |
| Mn | <1,0 |
| P | <0,03 |
| S | <0,02 |
| Mo | 15,0–17,5 |
| Fe | <2,0 |
| Cr | 15,0–17,5 |
| W | <1,0 |
| Ni | Remainder |
Mechanical Properties of A494 Grade CW2M Alloy under Normal Conditions
The specified mechanical properties of CW2M alloy castings ensure the structural integrity and durability of equipment operating under high pressure. The material is characterized by an optimal balance of tensile strength and ductility, which is critically important for preventing brittle fracture.
| Tensile Strength (Rm), min., MPa | Yield Strength (Rp 0.2), min., MPa | Elongation after fracture (A5), min., % |
|---|---|---|
| 495 | 275 | 20 |
Physical Properties and Design Parameters of CW2M Alloy
The physical density of A494 Gr CW2M nickel alloy is 8.85 g/cm³. This is a fundamental parameter used by design engineers when calculating the mass of components and static loads on supporting structures of pipeline systems and process equipment.
Processability and Weldability of CW2M Alloy
The CW2M material demonstrates good machinability and weldability, which is confirmed by its classification according to international standards. This allows for complex welding and assembly operations during the assembly of critical units and structures manufactured by EV Group China directly at the operating sites.
| Weldability | According to ISO 15608 | ASME Section IX Classification | |
|---|---|---|---|
| Weldability | Group 43 | Welding | Brazing |
| Weldability | Group 43 | P-Number: 43 | P-Number: 111 |
Analogues and Equivalents of A494 CW2M Alloy according to International Standards
When it is necessary to select interchangeable materials for equipment design, modernization, or repair, EV Group China engineers use the following table of CW2M alloy compliance with analogues according to key international standards:
| Germany (DIN / EN) | Japan (JIS) | Great Britain (BS) | USA (ASTM/ASME) | China (GB) |
|---|---|---|---|---|
| NiMo16Cr16Ti, 2.4610, 9.4610 | NW6455, NiCr16Mo16Ti | NA 15 | A 781 Grade CW2M, A 990 Grade CW-2M | H03350, NS335 |