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Incoloy 800/800H/800HT Round Bars Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier of Incoloy 800, 800H, and 800HT round bars and rods based in Mumbai, India. We supply Alloy 800 bar stock with EN 10204 3.1 mill test certificates and PMI reports.
These iron-nickel-chromium alloys (Fe ≥39.5%, Ni 30–35%, Cr 19–23%) are manufactured to ASTM B408 / ASME SB408 for high-temperature strength, oxidation resistance, and carburization resistance in furnace and process plant environments. Three grades share the same base composition but differ in carbon control and grain size. Alloy 800 (UNS N08800, W.Nr. 1.4876) covers general service to 816°C (1500°F). Alloy 800H (UNS N08810, W.Nr. 1.4958) restricts carbon to 0.05–0.10% and requires ASTM 5 or coarser grain size for higher creep-rupture strength, approved to 899°C (1650°F) per ASME Code Case 1325. Alloy 800HT (UNS N08811, W.Nr. 1.4959) further tightens carbon to 0.06–0.10% and Al+Ti to 0.85–1.20% for maximum rupture life under Code Case 1987.
Room-temperature tensile strength reaches 520 MPa (75 ksi) with 30% elongation. Density is 7.94 g/cm³, and the melting range falls between 1357–1385°C. Diameters span 3–500 mm in lengths of 1–6 m. Forms include round bar, hex bar, flat bar, square bar, forged bar, hollow bar, and threaded bar. Conditions: hot finished, cold drawn, solution annealed, and centreless ground. Surface finishes include black, bright, peeled, rough turned, and polished. NACE MR-01-75 listed. Dual certification (800H/HT) is available on request.
Incoloy 800/800H/800HT Round Bar Specifications
Incoloy 800 bar specifications cover standards, dimensional range, surface finishes, tolerances, and available product forms for engineering applications:
| Standard | ASTM B408 |
|---|---|
| AMS Standard | ASME SB408 | Diameter | 3 – 500 mm |
| Length | 1 – 6 m, cut-to-length |
| Condition | Hot Finished, Cold Drawn, Solution Annealed |
| Surface | Black, Bright, Peeled, Rough Turned, Polished |
| Tolerance | h7, h9, h10, h11 per ISO 286-2 |
| Forms | Round, Hex, Flat, Square, Forged, Hollow, Threaded |
Chemical Composition of Incoloy 800/H/HT Round Bar
Incoloy 800 chemical composition per ASTM B408. Key differences are in carbon, aluminium, titanium, and grain size:
| Element | Nickel (Ni) | Chromium (Cr) | Iron (Fe) | Carbon (C) | Al + Ti | Mn | Si | Grain Size |
|---|---|---|---|---|---|---|---|---|
| 800 (N08800) | 30.0–35.0 | 19.0–23.0 | 39.5 min | 0.10 max | 0.30–1.20 | 1.5 max | 1.0 max | Not specified |
| 800H (N08810) | 30.0–35.0 | 19.0–23.0 | 39.5 min | 0.05–0.10 | 0.30–1.20 | 1.5 max | 1.0 max | ASTM 5 or coarser |
| 800HT (N08811) | 30.0–35.0 | 19.0–23.0 | 39.5 min | 0.06–0.10 | 0.85–1.20 | 1.5 max | 1.0 max | ASTM 5 or coarser |
Controlled C, Al+Ti, and coarser grain size in 800H/HT produce superior creep-rupture performance above 593°C (1100°F). Coarser grains resist grain-boundary sliding, which is the primary creep mechanism at elevated temperatures.
Mechanical Properties of ASTM B408 Incoloy 800/800H/800HT Round Bar
Mechanical properties of Incoloy 800 as specified in ASTM B408 for hot-finished, annealed round bars used in high-temperature service.
| Property | Tensile (min) | Yield 0.2% (min) | Elongation (min) |
|---|---|---|---|
| 800 | 520 MPa (75 ksi) | 205 MPa (30 ksi) | 30% |
| 800H | 520 MPa (75 ksi) | 170 MPa (25 ksi) | 30% |
| 800HT | 520 MPa (75 ksi) | 170 MPa (25 ksi) | 30% |
800H and 800HT show lower room-temperature yield (170 vs 205 MPa) because the coarser grain size and higher anneal temperature soften the bar at ambient. The trade-off: significantly higher creep-rupture strength above 593°C. ASME Code Case 1325 (800H) and 1987 (800HT) define higher allowable design stresses at elevated temperatures.
Physical Properties of Incoloy 800/H/HT Bar & Rod
Physical properties, such as Incoloy 800 density and melting range, remain identical for grades 800, 800H, and 800HT round bars.
| Property | Density | Melting Range | Elastic Modulus | Thermal Conductivity (20°C) | Thermal Expansion (20–100°C) | Electrical Resistivity (20°C) | Curie Temperature |
|---|---|---|---|---|---|---|---|
| Value | 7.94 | 1357–1385 | 196 | 11.5 | 14.4 × 10⁻⁶ | 0.989 | –196 |
| Unit | g/cm³ | °C | GPa | W/m·°C | /°C | µΩ·m | °C |
Incoloy 800/H/HT Bar Equivalent Grades
Equivalent designations for Incoloy 800 series round bar, detailing corresponding UNS, Werkstoff, JIS, and GOST numbers:
| Standard | UNS | W.Nr. | JIS | GOST |
|---|---|---|---|---|
| 800 | N08800 | 1.4876 | NCF 800 | ЭИ670 |
| 800H | N08810 | 1.4958 | NCF 800H | ЭИ670 |
| 800HT | N08811 | 1.4959 | NCF 800HT | ЭИ670 |
Get Incoloy 800/800H/800HT Round Bars at Competitive Prices
Available Forms of Incoloy 800H, HT Bar
Incoloy 800 series bar stock forms:
Incoloy 800 Round Bar & Rod
Alloy 800H Hex Bar
Incoloy 800HT Flat & Square Bar
Incoloy 800 Forged Bar
Alloy 800H Hollow Bar
Incoloy 800HT Threaded Bar
Machining, Hot Working & Welding of Incoloy 800 Series Round Bar
Work hardening rate is similar to Inconel 600. Use rigid setups with carbide tooling at 25–40 m/min for turning. Avoid light cuts that ride on the work-hardened layer. Use heavy-duty coolants throughout.
Hot work at 871–1232°C (1600–2250°F). Do not work below 871°C. Post-hot-work annealing is required for 800H/HT to restore grain size and creep properties.
Weld by GTAW, GMAW, SMAW, or SAW using ERNiCr-3 (INCO-WELD A) filler. Post-weld anneal at 980°C for 800; at 1150°C for 800H/HT if destined for creep-rupture service. Interpass temperature: 150°C max
Industries Using Incoloy 800/800H/800HT Round Bar & Rod
Incoloy 800/800H/800HT round bars and rods deliver exceptional high-temperature strength and corrosion resistance across critical industrial applications.
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Petrochemical: Cracker tube support bars, pigtail rods, reformer header studs; 800H/HT preferred above 593°C for carburization resistance.
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Power Generation: Used for superheater support rods, boiler hanger bars, and steam piping studs, all approved under ASME codes.
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Furnace & Heat Treatment: Radiant tube support bars, muffle components, and conveyor rollers.
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Nuclear: Reactor core supports and control rod drive components (ASME Section III).
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Chemical Processing: Reactor bolting and agitator shafts in nitric acid and organic acid environments.
How to Order Incoloy 800 Bar
To order Incoloy 800 Bar, follow these 12 important details:
- Grade: Specify 800, 800H, or 800HT (dual certification 800H/HT available)
- Form: Round, Hex, Flat, Square, Forged, Hollow, or Threaded
- Diameter / Size: Specify in mm or inches
- Length: Standard (1–6 m) or cut-to-length
- Quantity: Weight (kg/MT) or piece count
- Condition: Hot finished, Cold drawn, Solution annealed (specify temperature)
- Surface finish: Black, Bright, Peeled, Rough turned, Polished
- Tolerance: h7, h9, h10, h11 or custom
- Specification: ASTM B408, ASME SB408, DIN 17752, or other
- Testing requirements: Tensile, Hardness, Impact (Charpy), IGC, PMI, UT, Grain size (ASTM E112)
- Certificates: EN 10204 3.1 MTR, NACE compliance if required
- Packaging: Bundle, wooden case, or custom export packing
Contact Nicorex Alloys for stock availability and price.
Frequently Asked Questions
What is the Difference Between Incoloy 800, 800H, and 800HT Round Bar?
All three share the same Ni-Cr-Fe base. 800H restricts C to 0.05–0.10% with grain size ASTM 5 or coarser for higher creep strength. 800HT further tightens C to 0.06–0.10% and Al+Ti to 0.85–1.20% for maximum rupture life. For service above 593°C, specify 800H or 800HT.
What is the Maximum Service Temperature for Alloy 800HT Bar?
ASME Code Case 1987 approves design stresses to 899°C (1650°F). In practice, furnace support bars operate continuously at 816–871°C.
Why is Grain Size Important for 800H/HT Bars?
Coarser grains (ASTM 5 or larger) resist grain-boundary sliding, the primary creep mechanism at high temperatures. Solution annealing at ≥1150°C achieves this grain size.
Which ASTM Standard covers Incoloy 800 Forgings vs Bars?
ASTM B408 covers rods and bars. ASTM B564 covers forgings. Verify which specification your end-use code requires based on the forging ratio.
Is Incoloy 800 Suitable for Sour Gas (H₂S) Service?
Incoloy 800 is approved by NACE MR-01-75 for certain sour-service conditions. For more severe sour environments that need higher strength, Incoloy 825 or 925 is preferred because they contain more nickel and molybdenum.
What is the Price of Incoloy 800H Bar per kg in India?
Price depends on the grade, diameter, order quantity, surface/stock condition, and current nickel price. In general, 800HT costs about 5–10% more than standard 800 because of its tighter chemistry controls. Contact Nicorex Alloys for current pricing.