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
NiMo28 is a solid-solution-strengthened nickel–molybdenum alloy, unique in that it contains essentially no chromium — an element common to nearly all other corrosion-resistant alloys. This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer) standard system.
The high nickel and molybdenum contents give it superior resistance to hydrochloric acid at all concentrations and temperatures, and to other reducing environments such as hydrogen chloride gas, sulphuric, acetic and phosphoric acids. It is an improved version of the original alloy B, with lower carbon and iron contents that resist carbide precipitation in the weld heat-affected zone, making it resistant to knife-line and HAZ attack and suitable for most chemical-process applications in the as-welded condition.
Because it contains no chromium, the alloy is vulnerable to attack in reducing acids contaminated with oxidising salts such as ferric or cupric chloride, and should not be used with iron or copper piping in hydrochloric-acid systems. In oxidising environments it should not be used above 540 °C, and prolonged exposure to 540–815 °C should be avoided to prevent loss of ductility. In reducing gas or vacuum it can be used to higher temperatures, and its low coefficient of thermal expansion is an asset in some high-temperature applications. It is listed in ISO 15156-3 / ISO 15156 for sour service.
Typical values, solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 9.22 | g/cm³ |
| Melting range | 1330–1370 | °C |
| Young's modulus (20 °C) | 217 | GPa |
| Specific heat capacity (20 °C) | 373 | J/kg·K |
| Thermal conductivity (20 °C) | 11.1 | W/m·K |
| Electrical resistivity (20 °C) | 1.37 | µΩ·m |
| Coefficient of thermal expansion (20–100 °C) | 10.3 | µm/m·°C |
| Maximum service temperature (oxidising) | ~540 | °C |
| Structure | Austenitic (FCC) | — |
Composition per DIN 17744 / 17750 (W.Nr. 2.4617, NiMo28).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel (Ni + Co) | Ni | Balance | — | Base; reducing-acid resistance |
| Molybdenum | Mo | 26.0 | 30.0 | Primary alloying; HCl resistance |
| Iron | Fe | — | 2.0 | Controlled low |
| Chromium | Cr | — | 1.0 | Essentially chromium-free |
| Cobalt | Co | — | 1.0 | Residual |
| Tungsten | W | — | 1.0 | Residual |
| Manganese | Mn | — | 1.0 | Deoxidiser |
| Copper | Cu | — | 0.5 | Residual |
| Titanium | Ti | — | 0.5 | Residual |
| Carbon | C | — | 0.01 | Ultra-low (DIN; HAZ resistance) |
| Silicon | Si | — | 0.08 | Very low (DIN) |
| Phosphorus | P | — | 0.025 | Residual impurity |
| Sulphur | S | — | 0.015 | Residual impurity |
Nominal: Ni-28Mo, chromium-free. The DIN limits restrict carbon to ≤0.01% and silicon to ≤0.08% to improve weld-HAZ corrosion behaviour over the original alloy B.
Solution-annealed condition, per DIN 17750 for W.Nr. 2.4617.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥750 | MPa |
| 0.2% proof strength (Rp0.2) | ≥340 | MPa |
| Elongation at fracture (A) | ≥40 | % |
| Brinell hardness | ≤240 | HB |
Values per EN/DIN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Hydrochloric acid (all conc. / temps) | Outstanding | Highest resistance of any nickel alloy |
| Hydrogen chloride gas | Outstanding | Exceptional resistance |
| Sulphuric acid (pure) | Excellent | Resists pure (uncontaminated) H₂SO₄ |
| Acetic / phosphoric acid | Excellent | Strong resistance |
| Reducing environments | Outstanding | High Ni + Mo |
| Pitting / crevice / SCC | Excellent | Resists chloride SCC, pitting, crevice |
| HAZ / knife-line attack | Excellent | Low C/Fe; usable as-welded |
| Oxidising media / ferric or cupric salts | Poor | No chromium — avoid oxidising contaminants, Fe/Cu salts |
A solid-solution nickel–molybdenum alloy; not age-hardenable. Heat treatment is solution annealing only.
Solution Anneal Temperature: ~1066 °C (1950 °F), followed by rapid cooling (water quench) Purpose: dissolves secondary phases, restores maximum corrosion resistance and ductility.
Service caution: avoid prolonged exposure to 540–815 °C (1000–1500 °F), which reduces ductility unless Fe + Cr are carefully controlled. In oxidising atmospheres limit to ~540 °C.
Good weldability; usable in the as-welded condition. The low carbon and iron contents prevent carbide precipitation in the heat-affected zone, giving resistance to knife-line and HAZ attack.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | W.Nr. 2.4615 (NiMo28) matching filler |
| GMAW / MIG | Good | W.Nr. 2.4615 (NiMo28) matching filler |
| SMAW / stick | Good | Matching Ni-Mo electrode |
Use matching Ni-Mo filler. Keep the joint clean and free of iron/copper contamination, which is detrimental in subsequent acid service.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Work hardening | High rate (typical of Ni-Mo alloys); rigid setup, sharp tooling, positive rake |
| Cutting | Low speed, sufficient feed/depth to cut below work-hardened layer |
| Coolant | Ample flood coolant |
| Preferred condition | Solution-annealed |
Forming Processes
| Process | Notes |
|---|---|
| Hot forming | Followed by solution anneal + rapid cool |
| Cold forming | Readily cold-formed; high work-hardening rate; intermediate anneals for heavy reductions |
| Cleanliness | Keep tooling free of iron contamination to protect acid-service performance |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical processing | HCl reactors, heat exchangers, storage tanks, piping, valves, pumps | HCl + reducing-acid resistance |
| Acetic / phosphoric acid | Process vessels and piping | Reducing-acid resistance |
| Pharmaceutical | Reactors, pressure vessels | Corrosion resistance + cleanliness |
| Petrochemical | Reducing-environment process hardware | Sulphuric/acetic acid resistance |
| High-temperature (reducing/vacuum) | Components needing low thermal expansion | Low CTE; reducing-atmosphere stability |
| Product Form | DIN / EN Standard | Other |
|---|---|---|
| Rod and bar | DIN 17752 | AFNOR NU-30M |
| Plate, sheet and strip | DIN 17750 | — |
| Seamless tube | DIN 17751 | — |
| Composition / designation | W.Nr. 2.4617 · NiMo28 | — |
| Welding consumables | W.Nr. 2.4615 (NiMo28) matching filler | — |
W.Nr. 2.4617; listed in ISO 15156-3 / ISO 15156 for sour service.
| EN Symbol | Ni % | Cr % | Mo % | Other | Best Used For |
|---|---|---|---|---|---|
| NiMo28 | bal | ≤1.0 | 26–30 | — | HCl all conc.; reducing acids (chromium-free) |
| NiMo28Fe | bal | 1.0–3.0 | 28.5 | Fe 1–3 | Improved thermal stability vs B-2; HCl service |
| NiMo16Cr15W | bal | 14.5–16.5 | 15–17 | W 3–4.5 | Both oxidising + reducing; broad corrosion |
| NiCr21Mo14W | bal | 20–22.5 | 12.5–14.5 | W 2.5–3.5 | Best pitting/crevice; mixed acids |
| NiCr22Mo9Nb | ≥58 | 20–23 | 8–10 | Nb | Seawater + strength; oxidising tolerant |
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