Nickel Alloy ASTM B407 Alloy 800 800H 800HT Boiler Tube
ASTM B407 refers to seamless nickel alloy tubing. Alloys 800, 800H, and 800HT are nickel-iron-chromium alloys known for their excellent high-temperature strength and corrosion resistance, making them suitable for boiler and furnace tubing, petrochemical processing, and heat exchangers. Alloy 800 is the base material, while alloy 800H has controlled carbon and grain size added to improve stress-rupture properties. Alloy 800HT further increases titanium and aluminum content to optimize creep and rupture strength for extreme high-temperature applications.
What are the mechanical properties of Alloy 800?
Incoloy Alloy 800 exhibits high mechanical strength over a wide temperature range. Generally, due to its strength properties, Alloy 800 can be used at operating temperatures up to approximately 1500°F (816°C). At these temperatures, equipment design is typically based on tensile properties.
| Seamless Pipe / Tubing | Welded Pipe / Tubing | |
| Incoloy 800 | ASTM B 407 / 163 | ASTM B 514 / 515 |
| ASME SB 407 / 163 | ASME SB 514 / 515 | |
| Incoloy 800H | ASTM B 407 / 163 | ASTM B 514 / 515 |
| ASME SB 407 / 163 | ASME SB 514 / 515 | |
| Incoloy 800HT | ASTM B 407 / 163 | ASTM B 514 / 515 |
| ASME B 407 / 163 | ASME SB 514 / 515 |
| Alloy 800 | Ni | Fe | Cr | Cu | Ti | Al | C | Mn | S | Si | |
| 30.0-35.0 | 39.5 min | 19.0-23.0 | 0.75 max | 0.15-0.60 | 0.15-0.60 | 0.1 max | 1.5 max | 0.015 max | 1.0 max | ||
| Alloy 800H | Ni | Fe | Cr | Cu | Ti | Al | C | Mn | S | Si | |
| 30.0-35.0 | 39.5 min | 19.0-23.0 | 0.75 max | 0.15-0.60 | 0.15-0.60 | 0.05-0.10 max | 1.5 max | 0.015 max | 1.0 max | ||
| Alloy 800HT | Ni | Fe | Cr | Cu | Ti | Al | C | Mn | S | Si | |
| 30.0-35.0 | 39.5 min | 19.0-23.0 | 0.75 max | 0.25-0.60 | 0.85-1.20 | 0.06-0.10 max | 1.5 max | 0.015 max | 1.0 max |
| Property | Incoloy 800 | Incoloy 800H | Incoloy 800HT |
|---|---|---|---|
| UNS Number | N08800 | N08810 | N08811 |
| Carbon Content | ≤ 0.10% | 0.05% – 0.10% | 0.06% – 0.10% |
| Grain Size Control | Not specified | Controlled for improved creep strength | Controlled for maximum creep-rupture strength |
| Aluminum + Titanium Content | 0.15% – 0.60% (combined) | Same as 800 | 0.85% – 1.20% (combined) |
| Maximum Service Temperature | Up to 1100°F (593°C) | Up to 1500°F (816°C) | Up to 1650°F (899°C) |
| Creep & Rupture Resistance | Good | Improved | Excellent |
| Applications | Heat exchangers, process piping | High-temperature reformers, heaters | Superheaters, industrial furnaces |
| ASTM Specification | B407 / B163 / B515 | B407 / B163 / B515 | B407 / B163 / B515 |
Key Features
Composition: Nickel-iron-chromium alloy.
High-Temperature Resistance: Excellent strength and resistance to oxidation, carburization, and nitriding.
Corrosion Resistance: Good corrosion resistance in aqueous environments.
Mechanical Properties: High rupture and creep strength at high temperatures.
Embrittlement Resistance: Resists long-term embrittlement at high temperatures.
Alloy Types
800 Alloy: A base alloy designed for general high-temperature applications.
800H Alloy: Improved stress-rupture properties achieved through increased carbon content and controlled grain size.
800HT Alloy: Further refined with increased titanium and aluminum content, providing superior creep and rupture strength.
Applications
Boiler Tubes: Used in high-temperature environments within boilers.
Petrochemical Industry: Suitable for cracking furnace tubes and process equipment.
Heat Treatment & Furnaces: Used in heat treatment equipment, tooling, and furnace components.
Heat Exchangers: Preferred for their high-temperature strength and corrosion resistance.
Power Generation: Applications include process piping and components within power generation facilities.
ASTM B407 Standard
This specification defines the requirements for seamless nickel alloys, including Incoloy 800, 800H, and 800HT, and specifies their chemical composition, mechanical properties, and manufacturing processes.
Gnee Steel specializes in the production and sale of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. Gnee Steel's products are widely used in aerospace, chemical, electric power, automotive, and nuclear energy applications. We also offer customized alloy solutions tailored to customer needs. For alloy pricing inquiries or customized alloy solutions, please contact us for a quote at ss@gneesteel.com.
