Nickel and nickel alloys · Сплав А494 Grade CW6M / SА494 Grade CW6M / N30107
Alloy A494 Grade CW6M (UNS N30107): Engineering Reference
Engineering Specification of Cast Alloy A494 Gr CW6M / SA 494 Gr CW6M
Nickel-chromium-molybdenum cast alloy CW6M, specified according to ASTM A494, is designed for operation in extreme corrosive conditions. EV Group China's engineers apply this material for the production of critically important pipeline fitting components intended for systems with high pressure and chemically aggressive operating environments. The alloy exhibits high stability in contact with powerful oxidizers and reducing agents.
| Standard | Classification | Areas of Application |
|---|---|---|
| ASTM A494 – Nickel and Nickel Alloy Castings | Chrome-nickel corrosion-resistant cast alloy | Manufacturing of cast components for shut-off and control valves: valve bodies, flanges, fittings |
| ASTM A494 – Nickel and Nickel Alloy Castings | Chrome-nickel corrosion-resistant cast alloy | Manufacturing of cast components for shut-off and control valves: valve bodies, flanges, fittings |
Chemical Composition of CW6M Alloy according to ASTM A494 (%)
The high content of alloying elements, particularly molybdenum and chromium, provides CW6M alloy with enhanced resistance to localized corrosion, including pitting and crevice corrosion, especially in environments with high chloride content.
| C | <0.02 |
|---|---|
| Si | <0.8 |
| Mn | <1.0 |
| P | <0.03 |
| S | <0.02 |
| Mo | 17.0–20.0 |
| Fe | <3.0 |
| Cr | 17.0–20.0 |
| Ni | Balance |
Mechanical Characteristics of A494 Gr CW6M Alloy under Normal Conditions
Standardized mechanical properties ensure the structural strength and reliability of products under static and dynamic loads. Quality control at EV Group China is carried out in strict compliance with the requirements of the ASTM A494 standard.
| Tensile Strength (Ultimate Tensile Strength), min., MPa | Yield Strength, min., MPa | Elongation, min., % |
|---|---|---|
| 495 | 275 | 25 |
Key Physical Properties
The density of A494 Gr CW6M alloy is 8.74 g/cm³. This parameter is key for engineering calculations of mass and dimensions of finished products and pipeline assemblies.
Processability and Welding Recommendations
CW6M alloy has good casting properties. Welding operations require the application of specialized technologies for nickel alloys to prevent hot cracking in the weld and maintain corrosion resistance in the heat-affected zone (HAZ).
| Weldability and Regulatory Approvals | According to ISO 15608 | ASME Section IX | |
|---|---|---|---|
| Weldability and Regulatory Approvals | Group 44 | Welding | Brazing |
| Weldability and Regulatory Approvals | Group 44 | P-Number: 4 | P-Number: 112 |
Analogues and Equivalents of A494 CW6M Alloy according to International Standards
The selection of analogues is carried out based on a comparison of chemical composition, mechanical properties, and corrosion resistance according to ASTM and UNS specifications. EV Group China engineers ensure full technical equivalence when replacing material.
| USA (ASTM/ASME) |
|---|
| A 781 Grade CW6M, N30107 |