Hastelloy C276 Stainless Steel Plates

Universal Corrosion Resistance: Resists both reducing and oxidizing acids, wet chlorine, chlorides, hypochlorite, and mixed acids – the most versatile corrosion-resistant alloy for plate applications.

Highest Pitting Resistance (PRE ≥ 65): Outstanding pitting and crevice corrosion resistance, the highest among all commercial plate materials, with PREN = %Cr + 3.3 × (%Mo + 0.5 × %W) + 16 × %N ≥ 65.

No Sensitization: Extremely low carbon content (≤0.010%) plus Mo/W content prevents carbide precipitation – can be used as-welded without post-weld heat treatment.

Excellent Resistance to Wet Chlorine and Hypochlorite: Premier material for handling wet chlorine gas, chlorine dioxide, and hypochlorite solutions.

Superior Hydrochloric Acid Resistance: Excellent performance in hydrochloric acid (HCl) across all concentrations and temperatures up to 400°C (752°F).

NACE MR0175 / ISO 15156 Compliant: Fully qualified for sour service with highest allowable H₂S partial pressures, documented HIC and SSC test reports available.

Excellent Resistance to Mixed Acids: Outstanding performance in mixed acid environments (HNO₃/HCl, H₂SO₄/HCl) where other alloys experience rapid attack.

Low Carbon Content (≤0.010%): Eliminates sensitization and intergranular corrosion concerns, even in severe service.

Good High-Temperature Strength: Maintains excellent mechanical properties up to 400°C (752°F) in corrosive service and up to 540°C (1000°F) in non-corrosive service.

Good Weldability: No preheat or post-weld heat treatment required. Can be welded using matching filler metals (ERNiCrMo-4).

International Certifications: Plates can be certified by ABS, BV, DNV, LR, and comply with NORSOK M-650, NACE MR0175, and ASME standards.

Hastelloy C276 (UNS N10276) is a nickel-chromium-molybdenum-tungsten alloy with the highest molybdenum content (15-17%) among commercial plate materials. The combination of high molybdenum and tungsten (3-4.5%) gives C276 the highest PREN of any commercial alloy (≥65). The extremely low carbon content (≤0.010%) ensures no sensitization and eliminates the need for post-weld heat treatment, even in severe service conditions.

Comparison of PREN (Pitting Resistance Equivalent) Values:

High-Temperature Tensile Properties (Annealed Condition, Typical Values):

NACE MR0175 / ISO 15156 Compliance:
Hastelloy C276 is fully qualified for sour service applications up to the highest limits specified in NACE MR0175/ISO 15156 for nickel-based alloys. Maximum sour service temperature: 232°C (450°F).

Maximum Recommended Service Temperatures:

Critical Note: Hastelloy C276 must be water quenched after solution annealing. Air cooling may result in precipitation of intermetallic phases that can reduce corrosion resistance. The extremely low carbon content (≤0.010%) ensures that sensitization is not a concern. Unlike many stainless steels, C276 can be used in the as-welded condition without any risk of intergranular attack.

Heat Treatment Condition:
All Hastelloy C276 plates are solution annealed at 1120–1175°C followed by immediate water quenching (delay must be kept under 30 seconds). This heat treatment dissolves precipitated carbides and intermetallic phases, relieves internal stresses from rolling, restores optimum corrosion resistance and ductility, and ensures the alloy's exceptional resistance to corrosive attack.

Critical Note: Hastelloy C276 requires immediate water quenching after solution annealing. Air cooling is completely unacceptable and will result in intermetallic phase precipitation, severely reducing corrosion resistance and toughness.

Delivery Condition:
Plates are normally supplied in annealed and pickled condition, providing a clean, smooth surface and exceptional corrosion resistance. Pickling uses specialized acids optimized for high-molybdenum nickel alloys with careful control to avoid hydrogen pickup. Bright annealing is not recommended for Hastelloy C276 due to the water quenching requirement.

Thickness Tolerances (Hot-Rolled – ASTM A480):

Width and Length Tolerances (Hot-Rolled – ASTM A480):

Chemical Analysis: PMI 100% verification for Ni (≥57%), Cr (14.5-16.5%), Mo (15-17%), W (3-4.5%) – tungsten verification critical.

Intergranular Corrosion Test: ASTM G28 Method A – validates resistance to intergranular corrosion (mandatory for C276).

Pitting Corrosion Test: ASTM G48 Method A – ferric chloride pitting test (typically no pitting at 40-50°C).

Mechanical Testing: Tensile strength (≥690 MPa), yield strength (≥310 MPa), elongation (≥40%).

Dimensional Inspection: Thickness, width, length, flatness, squareness.

Surface Inspection: Visual check for surface defects, cracks, laminations, and consistency.

Ultrasonic Testing (UT): Per ASTM A435 for internal flaw detection (upon request).

Sour Service Qualification (upon request): HIC per NACE TM0284, SSC per NACE TM0177.

Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available upon customer request.

Hydrochloric Acid Service (HCl): HCl storage tank plates, acid regeneration vessels, pickling tank components, HCl vapor line equipment, concentrated HCl handling vessels, acid cooler shells.

Wet Chlorine & Hypochlorite Service: Chlorine gas drying tower plates, chlorine dioxide heat exchanger components, hypochlorite storage tanks, chlorinated hydrocarbon processing vessels, bleaching chemical system tanks, pulp & paper bleach plant equipment.

Pharmaceutical (High-Purity Aggressive): High-purity API reactor plates, sterile aggressive chemical storage tanks, clean steam system vessels, high-purity HCl handling equipment, biopharmaceutical process vessels.

Flue Gas Desulfurization (FGD): Reheater plates, gas-gas heater (GGH) components, slurry tank linings, absorber tower plates, quench vessel linings – for high-chloride, low-pH, high-temperature zones.

Oil & Gas (Severe Sour Service): Sour gas pipeline plates, high-pressure HP/HT sour gas manifolds, produced water treatment vessels, amine regenerator tanks (NACE MR0175 compliant, highest H₂S limits).

Waste Incineration: Flue gas heat exchanger plates, acid gas condenser components, scrubber vessels, reheat duct components – for high-chlorine, high-acid flue gases.

Chemical Processing (Extreme): Mixed acid (HNO₃/HCl, H₂SO₄/HCl) process vessels, chlor-alkali heat exchanger components, vinyl chloride monomer (VCM) processing vessels, titanium dioxide production equipment.

Offshore (Severe Sour Service): Offshore HP sour gas vessel plates, deepwater subsea sour service components (ABS, BV, DNV, LR certified, NORSOK M-650 qualified).

Hydrometallurgy: Pressure acid leaching (PAL) vessel plates, high-temperature solvent extraction tanks, electrowinning cell components.

Pickling Plants (Steel Mills): Pickling tank plates, acid recovery system vessels, spent acid storage tanks, pickling line circulation equipment.

Womic Steel offers precision cutting services for Hastelloy C276 stainless steel plates:

Standard Packaging:

Plates wrapped with moisture-proof paper and VCI film

Edge protectors to prevent damage

Steel skids for plate protection

Clear labeling with grade (Hastelloy C276/N10276), heat number, dimensions, weight

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners – competitive freight rates

Professional loading and securing teams using non-metallic slings and padded supports prevent plate damage

Strict avoidance of contamination from carbon steel or other alloys during handling

Efficient document preparation (EN 10204 Type 3.1 MTR, PMI reports, ASTM G28 test reports, ASTM G48 test reports, NACE certificates) minimizes customs delays

Continuous cargo tracking and after-sales follow-up

1. What makes Hastelloy C276 different from Alloy 625 for plate applications?
Hastelloy C276 has significantly higher molybdenum (15-17% vs 8-10%) and contains tungsten (3-4.5%), giving it PRE ≥65 vs ≥45 for Alloy 625. C276 offers superior resistance to hydrochloric acid (all concentrations), wet chlorine, and mixed acids where Alloy 625 may be marginal. For HCl and wet chlorine service, C276 is the preferred material.

2. Is Hastelloy C276 resistant to hydrochloric acid (HCl)?
Yes. Hastelloy C276 has excellent resistance to hydrochloric acid across the entire concentration range at temperatures up to 400°C (752°F). It is considered the premier material for HCl handling systems, including storage tanks, piping, and process vessels.

3. Can Hastelloy C276 plates be used in wet chlorine service?
Yes. Hastelloy C276 is the premier material for wet chlorine service. Unlike most alloys that fail rapidly in wet chlorine due to pitting or SCC, C276 has outstanding resistance and is the industry standard for chlorine drying and handling equipment.

4. Do Hastelloy C276 plates require post-weld heat treatment for fabricated vessels?
No. Due to extremely low carbon content (≤0.010%), C276 can be used in the as-welded condition without any risk of sensitization or intergranular corrosion. This is a significant advantage for field fabrication of large vessels.

5. What is the maximum temperature for C276 plates in HCl service?
Up to 400°C (752°F) for general corrosive service. For concentrated HCl at elevated temperatures, consult corrosion charts. Above 540°C (1000°F) in non-corrosive service, C276 remains stable but mechanical properties degrade.

6. Are Hastelloy C276 plates available with ASME certification?
Yes. Hastelloy C276 plates can be supplied with ASME SB575 certification for pressure vessel applications. Full traceability and testing documentation included.

Highest Corrosion Resistance: PRE ≥65 – unmatched among all plate materials for HCl and wet chlorine service

NACE MR0175 / ISO 15156 Compliant: Highest H₂S partial pressure tolerance, with HIC/SSC test reports

ASTM G28 and ASTM G48 Corrosion Testing: In-house corrosion testing capability with documented reports

Extremely Low Carbon Verified: ≤0.010% carbon content documented on MTR for each heat

Water Quenching Verified: Heat treatment records include time-temperature charts validating water quenching (<30 second delay)

ASME SB575 Certified: Pressure vessel grade plates available

Full Traceability: Heat number on each plate – traceable to original mill certificate

Complete Size Range: Thickness from 3mm to 60mm – standard and custom sizes

Cut-to-Size Services: Plasma, waterjet, and shearing for custom dimensions

Global Delivery: Exported to major chemical plants, FGD systems, pharmaceutical facilities, and HCl handling projects worldwide

Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Hastelloy C276 stainless steel plates. We offer certified quality, NACE MR0175 compliance, ASTM G28 and ASTM G48 corrosion testing, fast production lead times, and reliable global delivery for your extreme chemical processing, wet chlorine handling, HCl systems, and FGD projects.

Stock Examples (Hot-Rolled Hastelloy C276 Plates – No.1 Finish – HCl Service Grade):

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