Incoloy 800H vs 800HT - Full Comparison of Grain Size, Creep & Applications
Date: 2026年9月3日 Categories: News Views: 269
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is the Difference Between Incoloy 800H and 800HT?
Incoloy 800H (UNS N08810) and Incoloy 800HT (UNS N08811) share nearly identical chemistry — the real difference is heat treatment and grain size control. Both are solution-annealed at high temperature (1120-1180C) to produce a coarse grain (ASTM 5 or coarser) for creep strength, but 800HT additionally tightens the Al+Ti range (0.85-1.20% vs 0.30-1.20% for 800H) and guarantees minimum creep-rupture properties. For petrochemical reformers and steam-methane reformers above 600C, 800HT gives guaranteed creep life; 800H gives nearly the same performance at lower cost.
Chemistry & Specification Comparison
| Parameter | Incoloy 800H (N08810) | Incoloy 800HT (N08811) |
|---|---|---|
| Nickel | 30-35 | 30-35 |
| Chromium | 19-23 | 19-23 |
| Carbon | 0.05-0.10 | 0.06-0.10 |
| Aluminum + Titanium | 0.30-1.20 | 0.85-1.20 |
| Grain size (annealed) | ASTM 5 or coarser | ASTM 5 or coarser |
| Creep-rupture guarantee | Not specified | Guaranteed minimum |
High-Temperature Creep Comparison (Approximate)
| Test Condition | 800H | 800HT |
|---|---|---|
| 650C / 100,000h rupture | ~70 MPa | ~75 MPa |
| 700C / 100,000h rupture | ~45 MPa | ~50 MPa |
| 760C / 100,000h rupture | ~25 MPa | ~28 MPa |
| Max continuous service | ~1000C | ~1000C |
Mechanical Properties (RT, Annealed)
| Property | 800H | 800HT |
|---|---|---|
| Tensile Strength | 450-600 MPa | 450-600 MPa |
| Yield Strength | 170-260 MPa | 170-260 MPa |
| Elongation | 30-45% | 30-45% |
Which One for Your Application?
| Application | Best Choice | Why |
|---|---|---|
| Steam-methane reformer tubes | 800HT | Guaranteed creep life |
| Pyrolysis furnace tubes | 800HT | High-temp creep |
| Heat exchanger (600C+) | 800H | Cost-effective |
| Furnace headers | 800H | Adequate strength |
| Steam superheater tubing | 800HT | Long-term creep |
Price Comparison (2026, EXW)
| Form | 800H | 800HT |
|---|---|---|
| Tube (reformer) | \$18-30/kg | \$20-33/kg |
| Plate | \$16-26/kg | \$18-28/kg |
| Bar | \$15-24/kg | \$17-26/kg |
800HT is typically 5-10% more expensive due to tighter chemistry control and guaranteed properties.
FAQ
Q1: What is the difference between 800H and 800HT?
Heat treatment and guaranteed creep-rupture: 800HT tightens Al+Ti to 0.85-1.20% and guarantees minimum creep life.
Q2: Can 800H replace 800HT?
For many services yes, but for reformer tubes with design-life guarantees, 800HT is specified.
Q3: Which is stronger?
Room-temperature strength is similar; 800HT offers better long-term creep-rupture at 600-800C.
Q4: What are the UNS numbers?
N08810 = Incoloy 800H; N08811 = Incoloy 800HT.
Q5: Which is more expensive?
800HT is typically 5-10% more.
Q6: What grain size is required?
Both require ASTM 5 or coarser (coarse grain) for creep resistance.
Q7: What does Shanghai Hangbo supply?
Both grades in tubes, plates, bars, and fittings with EN 10204 3.1 certification. SGS/TUV/BV available.
Contact & Complete Product Range
Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier
Email: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
All Grades
Ni: NI200-N6 | Monel: 400-502, K-500, R-405 | Inconel: 600-740H, X-750, 725 | Incoloy: 800-27-7MO | Hastelloy: C-276-HYBRID-BC1, N | Super Austenitic: 904L-AL-6XN | Chromium-Rich: Alloy 33 | High-Strength Stainless: Nitronic 50/60, PH13-8Mo | Chlorination: Alloy 45 | Nimonic: 75-263 | Haynes: 25-HR-160 | RA: 330/333 | Precision: 1J22-4J45 | High-Strength: 18Ni250-AerMet100 | Heating: Cr20Ni80/60 | Specialty: Alloy 20-602CA
Product Forms: Bars(6-500mm) | Tubes(OD 6-610mm) | Plates(0.1-100mm) | Forgings | Welded Pipes | Fittings | Wire(0.05-10mm) | Strip(0.02-4.0mm)
SGS/BV/TUV. www.nickel-alloy.com
