Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
Alloy 75 is a solution-strengthened 80/20 nickel–chromium alloy with controlled additions of titanium and carbon, providing good resistance to high-temperature oxidation and corrosion together with useful strength and excellent formability. This datasheet presents the material within the American (ASTM / SAE-AMS / UNS) standard system.
First introduced in the 1940s for early gas-turbine components, it remains a basic heat-resistant alloy. The 18–21% chromium content forms a continuous, adherent Cr₂O₃ scale that gives oxidation protection up to 1100 °C, while the small titanium addition refines the grain-boundary carbide distribution and improves scale adhesion under thermal cycling. Strengthening is by solid solution and a modest carbide dispersion; the alloy is not age-hardenable, which keeps it readily weldable and forgeable.
Its service envelope is principally 550–1100 °C in oxidising atmospheres, where oxidation resistance, weldability and formability are required and stress levels are low to moderate. Typical applications include gas-turbine ancillary parts (casings, shrouds, combustion supports), welded rings, industrial-furnace internals and heat-treatment fixtures, and nuclear components. Below ~550 °C, austenitic stainless steels are usually more economical; above ~815 °C under sustained stress, precipitation-hardened alloys (e.g. Nimonic 80A, 263, Waspaloy) are preferred.
Values per manufacturer data, solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 8.37 | g/cm³ |
| Melting range | 1340–1380 | °C |
| Young's modulus (20 °C) | 206 | GPa |
| Specific heat capacity (20 °C) | 461 | J/kg·K |
| Thermal conductivity (20 °C) | 11.7 | W/m·K |
| Electrical resistivity (20 °C) | 1.18 | µΩ·m |
| Coefficient of thermal expansion (20–100 °C) | 12.7 | µm/m·°C |
| Maximum oxidation-resistance temperature | ~1100 | °C |
| Useful strength to | ~815 | °C |
Limiting composition per AMS 5683 (UNS N06075).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance (~75) | — | Austenitic FCC matrix; high-temperature stability |
| Chromium | Cr | 18.0 | 21.0 | Forms Cr₂O₃ scale; oxidation resistance to 1100 °C |
| Titanium | Ti | 0.20 | 0.60 | Carbide refinement; scale adhesion; modest strengthening |
| Iron | Fe | — | 5.0 | Residual |
| Carbon | C | 0.08 | 0.15 | Grain-boundary carbides for strength |
| Manganese | Mn | — | 1.0 | Deoxidiser |
| Silicon | Si | — | 1.0 | Deoxidiser |
| Copper | Cu | — | 0.5 | Residual |
| Cobalt | Co | — | 2.0 | Residual (if determined) |
| Sulphur | S | — | 0.015 | Residual impurity |
Note: the absence of aluminium, niobium and cobalt additions keeps the alloy weldable and forgeable, but limits high-temperature strength versus age-hardenable Nimonic grades.
Typical room-temperature properties, solution-annealed condition.
| Property | Value | Source |
|---|---|---|
| Ultimate tensile strength | ~750 MPa | Typical |
| 0.2% proof strength (yield) | ~300 MPa | Typical |
| Elongation at break | ~40 % | Typical |
| Hardness | ~180 HB | Typical |
The alloy may also be strain-hardened (cold-worked) where higher tensile strength is required. It is solid-solution-strengthened, not age-hardenable. Values are typical; confirm against the mill test certificate for each delivery.
| Environment | Performance | Notes |
|---|---|---|
| Static high-temperature oxidation | Good | Continuous Cr₂O₃ scale; protection to ~1100 °C |
| Cyclic high-temperature oxidation | Good | Ti improves scale adhesion under thermal cycling |
| Carburisation | Moderate | Typical of 80/20 Ni-Cr |
| General atmospheric / mild media | Excellent | Ni-Cr base |
| Chloride stress-corrosion cracking | Good | High nickel content |
| Creep / rupture strength | Moderate | Not an age-hardening alloy; low-to-moderate stress only |
A solution-strengthened alloy; not age-hardenable. Heat treatment is for annealing only.
Anneal Temperature: 1050 °C (1920 °F), followed by air cooling Purpose: softening, recrystallisation and restoration of ductility.
The alloy can also be strain-hardened (cold-worked) for higher tensile strength where required. Strength derives from solid solution and a fine carbide dispersion, not from precipitation aging.
Readily welded — a key feature of this alloy, made possible by the absence of aluminium, niobium and cobalt. Suitable for MMA/SMAW, GTAW/TIG, GMAW/MIG and submerged-arc welding.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG · GMAW / MIG | Excellent | AWS A5.14 ERNiCr-3-type matching filler |
| SAW (submerged-arc) | Good | ERNiCr-3 wire + compatible flux |
| SMAW / MMA | Good | ENiCrFe-type electrode |
Clean joint preparation is essential. The alloy's good formability and weldability make it well suited to fabricated sheet and ring components.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Work hardening | Moderate (Ni-Cr behaviour); rigid setup, sharp tooling |
| Cutting | Positive rake, ample feed; flood coolant |
| Preferred condition | Solution-annealed |
Forming Processes
| Process | Notes |
|---|---|
| Hot forming | Standard hot-working practice for Ni-Cr alloys |
| Cold forming | Excellent formability; readily formed into sheet/ring components |
| Annealing | 1050 °C, air cool, after heavy cold work |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Gas turbines | Ancillary parts: casings, shrouds, combustion supports, welded rings | Oxidation resistance + weldability at low-moderate stress |
| Aerospace | Fabricated sheet components, rings, casings | Formability + oxidation resistance |
| Industrial furnaces | Furnace internals, heat-treatment fixtures | Repeated oxidising-atmosphere exposure |
| Nuclear | Fabricated high-temperature components | Oxidation resistance + stability |
| General high-temperature | Sheet/strip/forged parts running hot in oxidising atmospheres | Oxidation resistance to 1100 °C |
| Product Form | ASTM Standard | AMS Standard |
|---|---|---|
| Rod and bar | ASTM B637-related | AMS 5651 |
| Plate, sheet and strip | ASTM B637-related | AMS 5683 |
| Wire | — | AMS 5683-related |
| Forgings | ASTM B637-related | AMS 5651 |
| Welding consumables | AWS A5.14 ERNiCr-3-type matching filler (AWS 032) | — |
Solution-annealed heat-resistant Ni-Cr alloy. UNS N06075.
| Alloy | Ni % | Cr % | Other | Best Used For |
|---|---|---|---|---|
| Alloy 75 | bal | 18–21 | Ti 0.2–0.6 | Solution-strengthened; oxidation to 1100°C, low stress |
| Nimonic 80A | bal | 18–21 | Ti+Al (age-hard.) | Age-hardened; higher strength to ~815°C |
| Alloy 600 | ≥72 | 14–17 | Fe 6–10 | General high-temp; carburisation/nitriding |
| Alloy 601 | 58–63 | 21–25 | Al 1.0–1.7 | Cyclic oxidation to 1250°C |
| Alloy 617 | 44.5 | 20–24 | Co+Mo | Gas-turbine hot section; high creep strength |
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