Valve Material Reference
ASTM A494 CW6MC / CW12MW Valve
Hastelloy C-276 / Inconel 625 CastASTM A494 CW6MC and CW12MW are cast nickel alloy grades corresponding to Alloy 625 (CW6MC) and Hastelloy C (CW12MW) compositions respectively.
Form
Cast
Max Temp
+1040°C (C-type); +540°C continuous for valve service
Min Temp
−196°C (cryogenic capable)
Category
Nickel Alloy
What is ASTM A494 CW6MC / CW12MW?
ASTM A494 CW6MC / CW12MW (Hastelloy C-276 / Inconel 625 Cast) is a nickel alloy valve material. ASTM A494 CW6MC and CW12MW are cast nickel alloy grades corresponding to Alloy 625 (CW6MC) and Hastelloy C (CW12MW) compositions respectively. Temperature range: −196°C to +540°C (Alloy 625); −50°C to +1040°C (Hastelloy C276).
- Form:
- cast
- Max Temp:
- +1040°C (C-type); +540°C continuous for valve service
- Min Temp:
- −196°C (cryogenic capable)
Chemical Composition - ASTM A494 CW6MC / CW12MW
Temperature Range
−196°C to +540°C (Alloy 625); −50°C to +1040°C (Hastelloy C276)
Maximum Temperature
+1040°C (C-type); +540°C continuous for valve service
Minimum Temperature
−196°C (cryogenic capable)
Vajra Industrial Solutions manufactures and supplies valves in ASTM A494 CW6MC / CW12MW (Hastelloy C-276 / Inconel 625 Cast) for sulphuric acid (all concentrations and temperatures), with EN 10204 3.1 material traceability on every order.
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Equivalent Grades - ASTM A494 CW6MC / CW12MW
| Standard | Equivalent Grade |
|---|---|
| CW6MC / Alloy 625 | UNS N06625, ASTM B564 N06625 (forged) |
| CW12MW / Hastelloy C | UNS N10276, ASTM B574 / B564 N10276 |
| EN | 2.4856 (Alloy 625), 2.4819 (Hastelloy C-276) |
Suitable Services
Sulphuric acid (all concentrations and temperatures)
Hydrochloric acid (all concentrations)
Hydrofluoric acid (with care)
Phosphoric acid and phosphate chemicals
Chlorine and wet chlorine gas
Bleaching chemicals (ClO₂, NaOCl)
Seawater (aggressive conditions - splash zone, high velocity)
Mixed acids
Reducing and oxidising environments simultaneously
Not Suitable For
Cost-sensitive applications where SS 316 or duplex will suffice
High-temperature above alloy limits
Very high temperature oxidising gas service (use Inconel 600/800)
Valve Body Applications
Valve bodies for concentrated sulphuric and hydrochloric acid
Hydrofluoric acid (HF) valve bodies
Chlorine and hypochlorite valve bodies
Seawater and high-chloride service
Bleaching chemical valve bodies (pulp and paper)
Trim Applications
Alloy 625 / Hastelloy trim for corrosive service
Ball valve balls and stems in Alloy 625
Typical Valve Types in ASTM A494 CW6MC / CW12MW
Gate, globe, ball, check valves: Class 150–900
Specialist lined or solid Hastelloy valves for HF acid
Exotic alloy diaphragm valves for pharma/chemical
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We supply ASTM A494 CW6MC / CW12MW (Hastelloy C-276 / Inconel 625 Cast) valves with full certification documentation — EN 10204 3.1/3.2 MTCs and hydrotest certs as standard.