Incoloy 800H Round Bar
➡️ Alloy 800H | UNS N08810 | EN 1.4958 | X5NiCrAlTi31-20 | ASTM B408
➡️ 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:
N08810
Wr. No.:
1.4958
MTC Available:
EN 10204 3.1
Product Description for Incoloy 800H Round Bar
Incoloy 800H Round Bar is made from a nickel-iron-chromium alloy, UNS N08810, known in Europe as 1.4958 (X5NiCrAlTi31-20). Bars are supplied to ASTM B408 and ASME SB408. Incoloy is a trademark of Special Metals.
The alloy is a controlled version of Alloy 800 with higher carbon, a solution anneal at high temperature and a coarse grain size of ASTM 5 or coarser. These features give high creep and rupture strength above about 600°C.
The alloy has good resistance to oxidation, carburisation and sulfidation at high temperature, and good structural stability in long service.
Bars are supplied solution annealed, hot finished or cold finished, and turned or ground. The alloy is non-magnetic.
Common applications include petrochemical furnace parts, ethylene and steam methane reformer parts, pigtails and headers, heat exchangers, superheater and reheater parts, and industrial furnace fixtures. It is approved in the ASME code for high-temperature pressure service. The grade exists because standard Alloy 800 does not have enough creep strength for long service above about 600°C. By controlling carbon, raising the annealing temperature and requiring a coarse grain, producers give 800H much higher rupture strength while keeping the same good resistance to oxidation and carburisation. In refineries and petrochemical plants, 800H is the default material for many hot pigtails, manifolds and outlet headers, and bar is used for fittings, supports and fasteners connected to them. It is also used in industrial furnace hardware where parts must carry load for years at high temperature. Bars can be supplied cut to length and dual certified with 800HT.
Common Applications of Incoloy 800H 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 Incoloy 800H Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N08810
ASTM / ASME
USA
Alloy 800H / ASTM B408 / ASME SB408
EN 10302
Europe
1.4958 (X5NiCrAlTi31-20)
GB/T 150
China
NS1102 / NS112
JIS G4901
Japan
NCF 800H
KS D3731
South Korea
KS D3731 / KS D3698
ISO
International
NW8800
AFNOR NF A75-213
France
Z8NC33-21 / Z8NC32-21
GOST 5632
Russia
ЭИ670 / XH32T
Technical Specification for Incoloy 800H Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
800H / UNS N08810 / 1.4958
-
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 800H Round Bar
Incoloy 800H Round Bar is supplied to ASTM B408, with ASME SB408 for pressure equipment. The alloy must be solution annealed, usually at about 1150–1200°C, and have a grain size of ASTM 5 or coarser.
The coarse grain and controlled chemistry give high creep and rupture strength, which is the reason to choose this grade over standard Alloy 800.
Physical data for 800H are reference values used in thermal design. Tolerances follow ASTM B408.
Testing includes chemical analysis, tensile, grain size and dimensional checks, with UT, PMI and third-party inspection on request.
ASTM B408 requires 800H to be annealed at a minimum of about 1121°C, and the grain size check is part of acceptance, so ask for the grain size result on every certificate. Many mills supply dual-certified 800H/800HT bar. Triple certification with standard Alloy 800 is rarely possible, because coarse-grained 800H does not meet the higher yield strength required for Alloy 800. For European projects, 1.4958 to EN 10302 is the matching grade. The ASME code gives allowable stresses for 800H at temperatures up to about 900°C, which makes it a common pressure-part material in reformer and ethylene furnaces. Bars used for welded fittings should be ordered with the filler metal and welding procedure in mind.
Chemical Composition for Incoloy 800H 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
0.05
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
%
Chemical Composition
View the chemical composition and applicable material limits for Incoloy 800H Round Bar
The table shows the ASTM B408 limits for UNS N08810.
Nickel at 30–35% gives a stable austenitic structure and resistance to chloride stress corrosion and carburisation. Chromium at 19–23% gives oxidation resistance.
Carbon at 0.05–0.10% supports creep strength by forming carbides. Aluminium and titanium are controlled to form fine precipitates that add creep strength.
Iron forms most of the balance. Residuals are limited. Carbon at 0.05–0.10% is the key difference from standard Alloy 800, where carbon is only limited to 0.10% maximum. The minimum of 0.05% ensures enough carbides form at grain boundaries during service to resist creep. Aluminium and titanium at 0.15–0.60% each add fine precipitates, and their combined level affects both creep strength and ductility over time. Nickel at 30–35% makes the alloy fully austenitic and resistant to carburisation and chloride stress corrosion cracking. Chromium at 19–23% forms the oxide scale that protects the alloy in hot gases. Iron makes up the rest, at least 39.5%, which keeps cost lower than in high-nickel alloys.
Manganese up to 1.50% and silicon up to 1.00% help deoxidise the melt. Copper is held to 0.75% and sulfur to 0.015% to protect hot ductility and weld quality.
Mechanical Properties for Incoloy 800H 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 Incoloy 800H Round Bar
The values shown are ASTM B408 minimum requirements for UNS N08810 in the solution annealed condition.
Room-temperature strength is moderate. The main advantage is high creep and rupture strength above about 600°C, which should be taken from ASME code tables.
Confirm grain size and results on the mill certificate. ASTM B408 requires solution annealed 800H bar to reach tensile strength of at least 450 MPa, yield strength of at least 170 MPa and elongation of at least 30%, with a grain size of ASTM 5 or coarser. These room-temperature values are lower than for standard Alloy 800, because the coarse grain reduces yield strength. The benefit comes at high temperature, where the coarse grain and controlled carbon give much better creep and rupture strength. For pressure parts, use ASME allowable stresses. After long service at about 540–760°C, some loss of ductility is normal, and this should be considered when parts are repaired or re-welded during turnarounds.
Hardness is not a specified acceptance value in ASTM B408, but it is a useful check that the bar has been fully annealed. Elevated-temperature tensile tests can be ordered for design verification.
Dimension / Sizes for Incoloy 800H 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 Incoloy 800H Round Bar
Pricing for Incoloy 800H 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 800H 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 800H or standard Alloy 800?
Why does 800H need a coarse grain size?
Can 800H be dual certified with 800HT?
What temperature can 800H be used at?
How is 800H welded and machined?
What are the limits of 800H?
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