Incoloy 800HT Round Bar
➡️ Alloy 800HT | UNS N08811 | EN 1.4959
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Nickel Alloy
UNS Number:
N08811
Wr. No.:
1.4959
MTC Available:
EN 10204 3.1
Product Description for Incoloy 800HT Round Bar
Incoloy 800HT Round Bar is made from UNS N08811, a nickel-iron-chromium alloy known in Europe as 1.4959 (X8NiCrAlTi32-21). It is supplied to ASTM B408 and, for pressure equipment, ASME SB408. INCOLOY is a trademark of Special Metals, and other mills sell the same grade as Alloy 800HT.
Alloy 800HT is the most tightly controlled member of the Alloy 800 family. It keeps the 30–35% nickel and 19–23% chromium of the base alloy, but narrows carbon to 0.06–0.10% and requires aluminium plus titanium of 0.85–1.20%. It is annealed at about 1149°C minimum to a grain size of ASTM 5 or coarser. The result is the most consistent creep and rupture strength in the family, especially above about 700°C.
The alloy resists oxidation, carburisation and nitriding in hot furnace gases and stays austenitic and non-magnetic. Bars are supplied solution annealed, hot or cold finished, and can be turned, peeled or ground.
Refineries and petrochemical plants use 800HT for steam methane reformer outlet systems, pigtails, manifolds, ethylene cracker parts and hot-gas fittings, where years of creep life are needed at temperatures that would overload stainless steels. Most 800HT heats also meet 800H limits, so dual-certified bar is common and simplifies stock control for plants that use both grades. Because creep strength depends on both chemistry and grain size, the certificate matters more for 800HT than for most alloys. Buyers should check carbon, the aluminium plus titanium total, annealing temperature and grain size on every certificate before parts go into service. Bars can be cut to length and marked with heat numbers for traceability.
Common Applications of Incoloy 800HT Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for Alloy 800HT Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N08811
ASTM/ASME
USA
ASTM B408 / ASME SB408
EN 10302
Europe
1.4959 (X8NiCrAlTi32-21)
GB/T
China
NS1403 / 06Cr21Ni31AlTi
JIS
Japan
NCF 800HT
BS
United Kingdom
NA 15(HT) / BS 3076
GOST
Russia
ЭИ670 / XH32T
KS
South Korea
KS D 3725
Technical Specification for Incoloy 800HT Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
800HT / UNS N08811 / 1.4959
-
Standard
ASTM B408 / ASME SB408
-
Product Form
Round bar / rod
-
Diameter (supply range)
6–250
mm
Length (random)
1–6
m
Manufacturing Process
Hot rolled, forged, extruded or cold drawn
-
Surface Finish
Descaled, pickled, peeled, turned, ground or bright
-
Heat Treatment / Delivery Condition
Solution annealed (grain size ASTM 5 or coarser)
-
Tolerance Standard
ASTM B408 tolerance tables
-
Density
7.94
g/cm³
Melting Range
1357–1385
°C
Thermal Conductivity at 20°C
11.5
W/m·K
Coefficient of Thermal Expansion 20–100°C
14.4
µm/m·K
Specific Heat at 20°C
460
J/kg·K
Electrical Resistivity at 20°C
0.99
µΩ·m
Modulus of Elasticity at 20°C
196
GPa
Magnetic Properties
Non-magnetic
-
Testing / Inspection
Chemical analysis, tensile, hardness, dimensional, UT and PMI on request
-
Certification
EN 10204 3.1 mill test certificate (3.2 on request)
-
Technical Specifications
Get the key technical specifications for Incoloy 800HT Round Bar
Incoloy 800HT Round Bar is ordered as UNS N08811 to ASTM B408, with ASME SB408 used for code pressure parts. In Europe, the matching grade is 1.4959 to EN 10302 for creep-resisting steels and nickel alloys.
Acceptance rests on three checks that set 800HT apart from ordinary Alloy 800: carbon of 0.06–0.10%, combined aluminium plus titanium of 0.85–1.20%, and an annealed grain size of ASTM 5 or coarser after solution treatment at about 1149°C minimum. The certificate should show each of these, together with the actual annealing temperature.
Physical values in the table are reference data for thermal design. Bar tolerances follow ASTM B408. For critical reformer and cracker parts, buyers commonly add ultrasonic testing, positive material identification and third-party witnessing.
The main thing to check on an 800HT order is which documents govern aluminium and titanium. ASTM B408 lists each element at 0.15–0.60%, with the combined total at 0.85–1.20%. Some other specifications, such as ASTM A479 and producer data sheets, require each element to be at least 0.25%. If the bar will be used under several specifications, order to the tightest set of limits. The minimum annealing temperature for 800HT is also higher than for 800H, at about 1149°C, so the certificate should confirm the annealing temperature as well as the grain size. For European orders, the matching grade is 1.4959 to EN 10302.
Chemical Composition for Incoloy 800HT Round Bar
Element
Symbol
Min
Max
Unit
Nickel
Ni
30.0
35.0
%
Chromium
Cr
19.0
23.0
%
Iron
Fe
39.5
-
%
Carbon
C
0.06
0.10
%
Aluminium
Al
0.15
0.60
%
Titanium
Ti
0.15
0.60
%
Manganese
Mn
-
1.50
%
Silicon
Si
-
1.00
%
Sulfur
S
-
0.015
%
Copper
Cu
-
0.75
%
Aluminium + Titanium
Al + Ti
0.85
1.20
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 800HT Round Bar
The chemistry table follows ASTM B408 for UNS N08811, including the combined aluminium plus titanium requirement that defines this grade.
Nickel at 30–35% makes the alloy fully austenitic and stable during long service, and it gives strong resistance to carburisation and chloride stress corrosion cracking. Chromium at 19–23% builds the protective oxide scale in hot air and process gases. Iron, at 39.5% minimum, makes up most of the balance and keeps the alloy cheaper than high-nickel grades. The narrower carbon range, 0.06–0.10% against 0.05–0.10% for 800H, removes the lowest-carbon heats that would give lower creep strength. The combined aluminium plus titanium of 0.85–1.20% is the key 800HT feature. These elements form fine gamma prime particles that slow down dislocation movement at high temperature, which raises rupture strength. Too little gives low creep strength, while too much can reduce ductility after long service, which is why both a minimum and a maximum are set.
Carbon at 0.06–0.10% forms carbides at grain boundaries during service, which pin the boundaries and resist creep. The narrower range removes low-carbon heats that would give weaker rupture life.
Aluminium and titanium are each limited to 0.15–0.60% in ASTM B408, but their total must be 0.85–1.20%. ASTM A479 and producer data sheets set each at 0.25% minimum, so buyers covering several specifications should order the tighter limits.
Mechanical Properties for Incoloy 800HT Round Bar
Mechanical Property
Value
Unit
Tensile Strength (ASTM B408, annealed)
≥ 450
MPa
Yield Strength 0.2% (ASTM B408)
≥ 170
MPa
Elongation (ASTM B408)
≥ 30
%
Grain Size (ASTM B408)
ASTM 5 or coarser
-
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 800HT Round Bar
The tensile, yield and elongation values are ASTM B408 minimums for UNS N08811 in the solution annealed condition, together with the required grain size. The room-temperature minimums for 800HT in ASTM B408 are the same as for 800H: 450 MPa tensile strength, 170 MPa yield strength, 30% elongation and a grain size of ASTM 5 or coarser. The difference shows up in creep and rupture tests above about 700°C, where the controlled chemistry gives more consistent long-term strength. ASME code tables list 800H and 800HT together for many product forms, so designers should check whether the higher 800HT values are being used. Because of its coarse grain, 800HT should be bent and formed with care, and parts may need re-annealing after heavy cold work to restore creep properties.
These minimums, 450 MPa tensile strength, 170 MPa yield strength and 30% elongation with ASTM 5 or coarser grain, match 800H at room temperature. The coarse grain lowers room-temperature yield strength compared with standard Alloy 800.
The real design values are creep and rupture strengths at service temperature, taken from ASME code tables or producer data. Long exposure at about 540–760°C can reduce room-temperature ductility, which should be allowed for when old parts are repaired.
Dimension / Sizes for Incoloy 800HT Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
6–300
mm
Standard Length (random)
1–6
m
Custom / Cut-to-Length
Available on request
-
Diameter Tolerance
Per ASTM B408 tolerance tables
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per ASTM B408 or as agreed
-
End Condition
Saw cut square, chamfered or as ordered
-
Surface Finish
Hot finished, descaled, pickled, peeled, turned, centreless ground or cold drawn bright
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy 800HT Round Bar
Pricing for Incoloy 800HT Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Incoloy 800HT Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
Should I choose 800HT or 800H?
Is 800HT a registered trademark?
Why does 800HT need a higher annealing temperature?
Can I use 800HT where 800H is specified?
How is 800HT welded and machined?
What are the limits of 800HT?
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