What is NCF 800H?
NCF 800H is the Japanese Industrial Standard designation for a nickel-iron-chromium heat resisting alloy containing nominally 30-35 % nickel, 19-23 % chromium and a deliberately controlled carbon content of 0.05-0.10 %, with iron as the balance. The same material appears on drawings as Alloy 800H, UNS N08810, W.Nr. 1.4958 and X5NiCrAlTi31-20.
The letter H does not indicate a heat treatment condition. It denotes a separate grade. Two things separate NCF 800H from plain NCF 800: carbon is held in the upper part of the alloy 800 range rather than run low, and the material is solution annealed near 1150 °C instead of about 980 °C so that the grain coarsens to ASTM 5 or coarser. Together these raise creep and stress-rupture strength substantially above 600 °C.
NCF 800H resists oxidation, carburisation and nitridation, and remains metallurgically stable through long high-temperature holds. It also has good resistance to chloride stress-corrosion cracking. Typical service includes ethylene furnaces, steam reformers, heat-treatment furnace internals, petrochemical process heaters, nuclear steam generators and high-temperature pressure vessels.
Service temperature: where NCF 800H sits
ASME 980 °C1796 °F
Selection guide: below about 600 °C plain alloy 800 is sufficient; 600 to 800 °C is normally NCF 800H; above about 800 °C with sustained creep loading, 800HT is usually specified. ASME Boiler & Pressure Vessel Code allowable stresses for alloy 800H run to 816 °C (1500 °F). Design temperature must be established from your governing code by your design engineer.
NCF 800H chemical composition
Composition limits for NCF 800H under JIS G4902. Jiangyin Jiangnan Metal Co., Ltd. reports the actual heat analysis for every melt on the EN 10204 certificate that accompanies the forging.
| Limit | C | Si | Mn | P | S | Ni | Cr | Cu | Al | Ti | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 0.05 | - | - | - | - | 30.00 | 19.00 | - | 0.15 | 0.15 | - |
| Max | 0.10 | 1.00 | 1.50 | 0.030 | 0.015 | 35.00 | 23.00 | 0.75 | 0.60 | 0.60 | Balance |
The 0.05 % carbon minimum is the key requirement of the H grade. A heat that analyses below 0.05 % C may still satisfy plain alloy 800 but cannot be certified as NCF 800H / UNS N08810.
NCF 800H mechanical properties
Room-temperature minimum properties in the solution annealed condition. Test pieces are taken from the forging itself or from a sacrificial prolongation, in the orientation stated on the order.
| 0.2 % proof strength | Tensile strength | Elongation | Hardness (HV) | Hardness (HB) |
|---|---|---|---|---|
| ≥ 175 N/mm² (25 ksi) | ≥ 450 N/mm² (65 ksi) | ≥ 30 % | ≤ 171 | ≤ 167 |
Typical physical properties
| Property | Typical value |
|---|---|
| Density | 7.94 g/cm³ (0.287 lb/in³) |
| Melting range | 1357-1385 °C (2475-2525 °F) |
| Modulus of elasticity | ≈ 196 GPa (28.4 × 10⁶ psi) |
| Structure | Austenitic, face-centred cubic, non-magnetic |
| Grain size | ASTM 5 or coarser (required by the grade) |
Physical properties are typical published values for the alloy and are given for reference only. They are not certified values and must not be used as design inputs. Use the governing specification and the mill certificate for the actual heat.
NCF 800H standards and equivalent designations
NCF 800H, Alloy 800H, UNS N08810 and W.Nr. 1.4958 all describe the same alloy. The designation used on a purchase order depends on the specifying code rather than on the material itself.
| System | NCF 800 | NCF 800H | NCF 800HT |
|---|---|---|---|
| UNS | N08800 | N08810 | N08811 |
| Werkstoff no. | 1.4876 | 1.4958 | 1.4959 |
| EN name | X10NiCrAlTi32-20 | X5NiCrAlTi31-20 | X8NiCrAlTi32-21 |
| JIS | NCF 800 | NCF 800H | NCF 800HT |
| Trade name | Incoloy® 800 | Incoloy® 800H · Nicrofer 3220 H | Incoloy® 800HT · Nicrofer 3220 HP |
| Carbon | ≤ 0.10 %, typically low | 0.05-0.10 % | 0.06-0.10 % |
| Al + Ti | not controlled as a sum | 0.30-1.20 % | 0.85-1.20 % |
| Anneal | ≈ 980 °C | ≈ 1150 °C | ≈ 1150 °C |
| Chosen for | below ~600 °C | ~600-980 °C | sustained above ~800 °C |
| Product form | JIS | ASTM | ASME |
|---|---|---|---|
| Forgings | - | B564 | SB-564 |
| Bar and rod | G4901 | B408 | SB-408 |
| Plate, sheet, strip | G4902 | B409 | SB-409 |
| Seamless pipe | G4903 | B407 | SB-407 |
| Heat exchanger tube | G4904 | B163 | SB-163 |
Incoloy® is a registered trademark of Special Metals Corporation. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with Special Metals Corporation and supplies material certified to the generic designations above. An order written "ASTM B564 UNS N08810" or "JIS NCF 800H" does not require branded material.
NCF 800H forged forms we produce
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging works, so every NCF 800H part is forged to the customer's drawing rather than pulled from a catalogue. Common forms:
- Seamless rolled ringsOD 200-3000 mm · wall 30-400 mm · height 50-800 mm
- Forged rings & retaining ringsrolled or mandrel-forged, rectangular or profiled
- FlangesWN, SO, BL, LJ, orifice, special · DN 15-DN 2000
- Shafts & spindlesØ 60-800 mm · length to 6000 mm · stepped or eccentric
- Round barsØ 20-800 mm, forged and peeled or rough-turned
- Discs & blanksØ 100-2000 mm · thickness 20-600 mm
- Tube sheets & tube platesto Ø 3000 mm, drilled on request
- Sleeves, bushings, hollow barstrepanned or bored, ID from 60 mm
- Blocks & rectangular forgingsfor valve bodies and manifolds
- Valve partsbodies, bonnets, stems, seat rings, blocks
- Nozzles & fittingsforged nozzle bodies, weldolet-type blanks
- Rolls & wheelsforged wheels, mill rolls, guide rolls
Single-piece weight ranges from about 5 kg to 10,000 kg. Sizes outside these ranges are quoted case by case. Send the drawing and we will confirm feasibility before quoting.
How we make NCF 800H forgings
- Melting. EAF + VOD as standard. ESR remelt is available where the specification or the application demands lower segregation and improved cleanliness. This is common for heavy sections and for nuclear or critical-service parts.
- Ingot inspection and conditioning. Hot-top discard, surface conditioning, and heat analysis confirmed before the ingot is released to the forge.
- Open-die forging. Upset and draw to achieve the forging ratio agreed for the part, worked within the alloy's hot-working range so that the wrought structure closes porosity and refines the as-cast grain. Rings are ring-rolled or mandrel-forged to produce a continuous circumferential grain flow.
- Solution annealing. Approximately 1120-1180 °C followed by rapid cooling. This produces the ASTM 5 or coarser grain size the H grade requires. Ageing after solution treatment is carried out where the customer specification calls for it.
- Rough machining. Turned, bored or milled to the agreed machining allowance so that ultrasonic testing is carried out on a clean, representative surface.
- Testing and NDT. Mechanical testing, hardness, grain size, and ultrasonic testing to the ordered class. Dimensional inspection against the drawing.
- Certification and despatch. EN 10204 3.1 or 3.2, marking as specified, preservation and packing for sea or air freight.
Testing, inspection and certification
Non-destructive testing
- Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, to the quality class stated on your order.
- Liquid penetrant (PT) to ASTM E165 / ASME V. This is the normal surface method for this austenitic, non-magnetic alloy.
- Magnetic particle (MT) is not applicable to NCF 800H: the alloy is austenitic and non-magnetic. If your specification calls for MT on this grade, tell us and we will raise it as a technical query before production.
- Visual and dimensional inspection against the released drawing.
Destructive and supplementary testing
- Room-temperature tensile, hardness (HB / HV), elongation and reduction of area
- Elevated-temperature tensile and stress-rupture testing
- Charpy V-notch impact testing at specified temperature
- Grain size determination to ASTM E112, confirming ASTM 5 or coarser
- Intergranular corrosion testing (ASTM A262 practices, where specified)
- Micro / macro examination, PMI (positive material identification)
Certification
EN 10204 3.1 mill certificate is supplied as standard with every NCF 800H forging, showing heat number, full chemical analysis, mechanical results, heat-treatment record and NDT report.
EN 10204 3.2 certification witnessed by TÜV, BV, SGS, Lloyd's Register or your own inspector is available. Please state the inspection body at enquiry stage so witness points can be built into the schedule.
Where NCF 800H forgings are used
The alloy is specified where a component has to hold strength and resist oxidation and carburisation through long, hot service. Typical applications for NCF 800H forgings supplied by Jiangyin Jiangnan Metal Co., Ltd.:
| Industry | Typical NCF 800H forged components |
|---|---|
| Petrochemical & refining | Steam reformer and pyrolysis furnace components, process heater parts, transfer-line hardware, forged nozzles |
| Pressure vessels & heat exchangers | Tube sheets, forged shell rings, flanges, forged tubes, channel and cover forgings |
| Heat treatment plant | Furnace retorts, muffles, radiant tube components, fixtures, roller and hearth parts |
| Power generation | Superheater and steam-generator components, turbine and gas-compressor forgings, gearbox parts |
| Nuclear | Steam generator and high-temperature reactor components, ESR route where specified |
| Valves & flow control | Bodies, bonnets, stems, seat rings and blocks for ball, gate, globe, check and plug valves |
| Chemical process | Columns, towers, reactor internals, crystalliser parts, chemical and plunger pump shafts |
| Oil & gas / offshore | Wellhead and Christmas-tree components, subsea hardware, compressor and generator parts |
| Heavy machinery | Mill rolls, forged wheels, manifolds, eccentric shafts, cement and sugar mill components |
How to request an NCF 800H quotation
Send a drawing to sales@steelforgepieces.com, or the eight items below if you do not have one yet. We normally reply with a price and lead time within one working day.
- Drawing, or finished dimensions plus machining allowance. PDF, DWG or STEP are all acceptable. A dimensioned sketch is enough to start.
- Quantity, and whether this is a one-off, a prototype or a repeat order. Unit price for ring-rolled parts changes significantly between 1 piece and 50.
- Governing standard. For example ASTM B564 UNS N08810, ASME SB-564, or JIS NCF 800H.
- Delivery condition. Solution annealed as standard; state if ageing, a specific anneal temperature or a maximum hardness is required.
- Melting route. EAF + VOD unless you require ESR. Please state this at enquiry stage, because it changes both price and lead time.
- NDT standard and acceptance class. EN 10228-3, SEP 1921 or ASTM A388, plus the class.
- Certificate type. EN 10204 3.1, or 3.2 with the inspection body named.
- Delivery port and Incoterm. EXW Jiangyin, FOB Shanghai, CIF or DAP.
Not sure whether you need 800, 800H or 800HT? Send the design temperature, the design life and the atmosphere, and we will advise which grade the published data supports.
NCF 800H frequently asked questions
What is NCF 800H?
NCF 800H is the Japanese Industrial Standard (JIS) designation for a nickel-iron-chromium heat resisting alloy containing nominally 30-35 % nickel, 19-23 % chromium and a controlled carbon content of 0.05-0.10 %, with the balance iron. It is the same material as Alloy 800H, UNS N08810 and W.Nr. 1.4958. The controlled carbon and a coarse grain size of ASTM 5 or coarser give it far better creep and stress-rupture strength above 600 °C than standard Alloy 800.
Is NCF 800H the same as Incoloy 800H?
Yes, they are the same alloy under different naming systems. NCF 800H is the JIS designation, Alloy 800H is the generic ASTM designation, UNS N08810 is the unified number and W.Nr. 1.4958 is the European material number. Incoloy® is a registered trademark of Special Metals Corporation, so a purchase order specifying "ASTM B564 UNS N08810" does not require Special Metals brand material. Jiangyin Jiangnan Metal Co., Ltd. supplies forgings certified against the UNS, JIS or W.Nr. designation.
What is the difference between NCF 800, NCF 800H and NCF 800HT?
All three share the same base composition of about 20 % chromium, 30 % nickel and balance iron. NCF 800 (UNS N08800, W.Nr. 1.4876) has low carbon and is normally selected below 600 °C. NCF 800H (UNS N08810, W.Nr. 1.4958) has carbon controlled to 0.05-0.10 % and a solution anneal near 1150 °C giving grain size ASTM 5 or coarser, which raises creep strength between roughly 600 and 980 °C. NCF 800HT (UNS N08811, W.Nr. 1.4959) adds a controlled aluminium-plus-titanium sum of 0.85-1.20 % and is preferred for sustained service above about 800 °C, such as reformer and pyrolysis tubes.
What is the chemical composition of NCF 800H?
Carbon 0.05-0.10 %, silicon 1.00 % max, manganese 1.50 % max, phosphorus 0.030 % max, sulphur 0.015 % max, nickel 30.00-35.00 %, chromium 19.00-23.00 %, copper 0.75 % max, aluminium 0.15-0.60 %, titanium 0.15-0.60 %, iron balance. Jiangyin Jiangnan Metal Co., Ltd. reports the actual heat analysis on the EN 10204 3.1 certificate supplied with every NCF 800H forging.
What are the mechanical properties of NCF 800H forgings?
In the solution annealed condition NCF 800H meets a minimum 0.2 % proof strength of 175 N/mm² (25 ksi), a minimum tensile strength of 450 N/mm² (65 ksi), a minimum elongation of 30 %, and a hardness of 171 HV or 167 HB maximum. Testing is carried out on a test piece taken from the forging or from a sacrificial prolongation.
What is the maximum service temperature of NCF 800H?
NCF 800H is the grade normally chosen for continuous service between about 600 and 980 °C, where its creep and stress-rupture strength is much higher than plain Alloy 800. ASME Boiler and Pressure Vessel Code allowable stresses for Alloy 800H extend to 816 °C (1500 °F), above which Alloy 800H and 800HT are the standard choices. The permissible design temperature for a specific component must be established from the governing code by the design engineer.
How are NCF 800H forgings heat treated?
NCF 800H forgings are solution annealed at approximately 1120-1180 °C followed by rapid cooling. This is hotter than the anneal used for Alloy 800 and produces the ASTM 5 or coarser grain size the grade requires. Jiangyin Jiangnan Metal Co., Ltd. can also carry out solution treatment plus ageing where the customer specification calls for it, and supplies the furnace charts with the certificate.
What testing and certification is supplied with NCF 800H forgings?
Every NCF 800H forging is ultrasonically tested to EN 10228-3, SEP 1921 or ASTM A388 to the acceptance class stated on the order. Liquid penetrant inspection, intergranular corrosion testing, grain-size measurement, elevated-temperature tensile testing and impact testing are available on request. Certification is EN 10204 3.1 as standard, or EN 10204 3.2 witnessed by TÜV, BV, SGS or Lloyd's Register.
Which standards can NCF 800H forgings be supplied to?
JIS G4901 for bars, JIS G4902 for plates and sheets, JIS G4903 for seamless pipes and JIS G4904 for heat exchanger tubes. The equivalent ASTM and ASME specifications for UNS N08810 are ASTM B564 / ASME SB-564 for forgings, ASTM B408 / ASME SB-408 for bar and rod, ASTM B409 / ASME SB-409 for plate, sheet and strip, ASTM B407 / ASME SB-407 for seamless pipe. The European equivalent is W.Nr. 1.4958, EN designation X5NiCrAlTi31-20.
Who supplies open-die forged NCF 800H in China?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, producing NCF 800H (UNS N08810) seamless rolled rings, forged rings, flanges, shafts, round bars, discs, blocks, sleeves, bushings and tube sheets to customer drawings. Enquiries: sales@steelforgepieces.com or +86 189 2135 9659. Send a drawing or the finished dimensions, quantity, applicable standard, NDT class and certificate type for a quotation.
What information is needed to quote an NCF 800H forging?
Send the drawing or the finished dimensions with machining allowance, the quantity, the governing standard (for example ASTM B564 UNS N08810 or JIS NCF 800H), the required delivery condition, the ultrasonic testing standard and acceptance class, the certificate type (EN 10204 3.1 or 3.2), any supplementary testing, and the delivery port and Incoterm. Jiangyin Jiangnan Metal Co., Ltd. normally replies with a price and lead time within one working day.
About the manufacturer
Jiangyin Jiangnan Metal Co., Ltd.
An open-die forging factory in Jiangyin, Jiangsu Province, about two hours by road from the port of Shanghai. We forge to drawing in carbon steel, alloy steel, tool steel, stainless steel and nickel-based alloys including NCF 800H, Inconel, Incoloy, Hastelloy, Monel and Nimonic grades.
We forge rather than trade, so the heat number on your certificate traces back to a melt in our own records. Technical questions are answered by our own works engineers.
No.1 Chengxiqiao Road
Zhouzhuang Town, Jiangyin City
Jiangsu Province, China
+86 189 2135 9659
sales@steelforgepieces.com
www.steelforgepieces.com
Page published 18 June 2015 · Technical content last reviewed and updated by the technical sales team at Jiangyin Jiangnan Metal Co., Ltd. Composition and mechanical limits are quoted from JIS G4902; cross-reference designations are quoted from the relevant ASTM, ASME, UNS and EN standards. Always verify against the current issue of your governing specification.