Valve Material Reference
ASTM B574 / UNS N10276 Valve
Hastelloy C-276Hastelloy C-276 (UNS N10276) is the most widely used nickel-molybdenum-chromium alloy in the world and the benchmark for corrosion-resistant valve trim and bodies in severe chemical service.
Form
Both
Max Temp
+371°C (+700°F) continuous
Min Temp
−196°C (−320°F)
Category
Nickel Alloy
Chemical Composition — ASTM B574 / UNS N10276
Temperature Range
−196°C to +371°C (−320°F to +700°F) continuous; short-term to 500°C
Maximum Temperature
+371°C (+700°F) continuous
Minimum Temperature
−196°C (−320°F)
Equivalent Grades — ASTM B574 / UNS N10276
| Standard | Equivalent Grade |
|---|---|
| UNS | N10276 |
| DIN / EN | 2.4819 / NiMo16Cr15W |
| ISO | NW-0276 |
| BS | NA 21 |
Suitable Services
Hydrochloric acid (all concentrations and temperatures)
Wet chlorine gas and sodium hypochlorite
Sulphuric acid at intermediate concentrations
Acetic acid, formic acid, and other organic acids
Chlorinated solvents (methylene chloride, vinyl chloride monomer)
Flue gas desulphurisation (FGD) — coal-fired power plants
Pharmaceutical synthesis reactors and containment valves
Mixed-acid (HCl + H₂SO₄) duties in chemical manufacturing
Not Suitable For
Fuming nitric acid (>70%) — use titanium or Hastelloy C-22
Concentrated phosphoric acid above 80°C — test required
Temperatures above 500°C — nickel alloy strength drops sharply
Valve Body Applications
Ball valves for wet chlorine and hydrochloric acid service
Globe and needle valves in concentrated H₂SO₄ and HCl streams
Diaphragm and pinch valves for aggressive chemical processing
Plug valves in flue gas desulphurisation (FGD) scrubbers
Trim Applications
Seats and balls in chemical service ball valves
Stems and packing followers in acid-service globe valves
Cage and plug trim for control valves in chlorinated environments
Typical Valve Types in ASTM B574 / UNS N10276
Ball valves: chemical-service full-bore, Class 150–600
Globe valves: control and throttling in acid process lines
Needle valves: instrumentation in aggressive chemical streams
Diaphragm valves: pharmaceutical / fine chemical containment
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Technical Reference
Industry Applications · 10 min read
How to Specify Industrial Valves for Chemical Service: A Complete Guide
Chemical plants handle some of the most aggressive fluids in any industry — strong acids, chlorinated solvents, caustic solutions, oxidising agents, and toxic gases. Specifying the wrong valve body material, seat, or seal material can lead to catastrophic corrosion, product contamination, or unsafe failure. This guide covers every variable in chemical valve specification.
All Valve Materials
Need ASTM B574 / UNS N10276 Valves?
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