The main differences between Incoloy alloy 800H and Incoloy alloy 800HT
The main differences between Incoloy alloy 800H and Incoloy alloy 800HT
The main difference is that Incoloy 800HT is an upgraded version of Incoloy 800H, with its chemical composition strictly controlled, resulting in superior creep and stress fracture properties. Both are iron-nickel-chromium alloys with similar high-temperature strength, but Incoloy 800HT contains higher levels of aluminum and titanium, and its carbon content range is also more stringent, ensuring it can withstand higher allowable design stresses in harsh application environments.
Is 800H alloy magnetic?
Mechanical Properties: 800H alloy has good weldability and can be welded using nonferrous filler metal (NFFM) processes. This alloy is non-magnetic in the welded state and can be used in applications requiring non-magnetic properties.
Choosing between 800H and 800HT is crucial for selecting high-temperature materials. Both are nickel-iron-chromium alloys, offering high strength and corrosion resistance. They are essential for systems requiring durable stainless steel pipes and fittings. Understanding the subtle differences between them is key to ensuring optimal performance.
Initially, both 800H and 800HT alloys were classified as nickel-based alloys and conformed to ASTM B409 and ASME SB409 standards.
Due to their lower nickel content (standards require 30% to 35%, with a typical content of 30%), they have now been removed from the nickel-based alloy category. For more detailed information on these three alloys, please refer to ASTM A240 and ASME SA240 standards.
800H VS 800HT : Chemical Composition
| Element | Incoloy 800H | Incoloy 800HT |
|---|---|---|
| Ni | 30.0 – 35.0 | |
| Cr | 19.0 – 23.0 | |
| Fe | Bal. (min. 39.5) | |
| C | 0.05 – 0.10 | 0.06 – 0.10 |
| Mn | ≤ 1.50 | |
| Al | 0.15 – 0.60 | |
| Ti | 0.15 – 0.60 | |
| Al + Ti | 0.30 – 1.20 | 0.85 – 1.20 |
800H VS 800HT : Mechanical Properties
| Property | Incoloy 800H | Incoloy 800HT |
|---|---|---|
| Tensile Strength (MPa) | ≥ 520 | ≥ 550 |
| Yield Strength (0.2% Offset) (MPa) | ≥ 205 | ≥ 240 |
| Elongation (%) | ≥ 30 | |
| Hardness | ≤ 190 | |
| Density | 7.94g/cm³ | |
| Melting Range | 1357−1430℃ | |
| Stress Rupture (10,000 hr @ 600℃) | Good | Higher Guaranteed |
Primary Application Drivers
| Environment | Incoloy 800H | Incoloy 800HT |
|---|---|---|
| High Heat | Furnaces, Heat Exchangers | Power Generation |
| Chemical Stress | Mildly corrosive, high temp | Chemical Processing |
| Pipe System | General high temp pipes | Critical high stress fittings |
Key Differences: Incoloy 800H vs. Incoloy 800HT
| Feature | Incoloy 800H | Incoloy 800HT |
|---|---|---|
| Composition | A controlled composition of nickel-iron-chromium with a carbon content range of 0.05% to 0.10% | A controlled composition with a more restrictive range of carbon, titanium, and aluminum |
| Titanium and Aluminum | Specified ranges for titanium and aluminum are broader | Specifications require titanium and aluminum to be in the upper portion of the range, leading to higher creep and stress-rupture properties |
| High-Temperature Performance | Offers improved creep and stress-rupture properties compared to the base alloy 800 | Offers superior creep and stress-rupture properties due to the tighter control of its chemistry |
| Mechanical Strength | Good strength in high-temperature applications | Higher allowable design stresses due to better creep and stress-rupture resistance |
| Applications | Suitable for many high-temperature applications | Preferred for the most demanding high-temperature and high-stress applications where its superior properties are necessary |
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of incoloy 800/800ht alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with incoloy 800/800ht alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells incoloy 800/800ht, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
