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
2.4810 is a solid-solution nickel–molybdenum alloy — the original member of the "B" family of corrosion-resistant alloys — with outstanding resistance to hydrochloric acid and other strongly reducing media. This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer) standard system.
Like all B-family alloys it contains essentially no chromium; the high nickel and molybdenum contents provide superior resistance to hydrochloric acid at all concentrations and temperatures, and to sulphuric, acetic and phosphoric acids and other non-oxidising acids. Iron and chromium are held low to reduce processing brittleness and to limit precipitation of the ordered Ni₄Mo (β) phase between about 700 °C and 870 °C.
The original alloy B has a higher carbon and iron content than the later low-carbon alloy B-2 (W.Nr. 2.4617); because of this it can be susceptible to carbide precipitation and intergranular attack in the weld heat-affected zone, and for most new fabrications the low-carbon B-2 or the more thermally stable B-3 are preferred. Being chromium-free, alloy B should not be used in oxidising environments or in reducing acids contaminated with oxidising salts (e.g. ferric or cupric chloride), and should not be used with iron or copper piping in hydrochloric-acid systems. It is listed in ISO 15156-3 / ISO 15156 for sour service.
Typical values, solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 9.24 | g/cm³ |
| Melting range | 1330–1380 | °C |
| Young's modulus (20 °C) | 217 | GPa |
| Specific heat capacity (20 °C) | 373 | J/kg·K |
| Thermal conductivity (20 °C) | 11.3 | W/m·K |
| Electrical resistivity (20 °C) | 1.35 | µΩ·m |
| Coefficient of thermal expansion (20–100 °C) | 10.2 | µm/m·°C |
| Maximum service temperature (oxidising) | ~540 | °C |
| Structure | Austenitic (FCC) | — |
Composition per DIN 17744 (W.Nr. 2.4800 / 2.4810, NiMo30).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base; reducing-acid resistance |
| Molybdenum | Mo | 26.0 | 30.0 | Primary alloying; HCl resistance |
| Iron | Fe | 4.0 | 6.0 | Present (higher than B-2) |
| Cobalt | Co | — | 2.5 | Residual |
| Chromium | Cr | — | 1.0 | Essentially chromium-free (defining feature) |
| Vanadium | V | 0.20 | 0.60 | Carbide former |
| Carbon | C | — | 0.05 | Higher than B-2 (HAZ sensitisation risk) |
| Manganese | Mn | — | 1.0 | Deoxidiser |
| Silicon | Si | — | 1.0 | Deoxidiser |
| Phosphorus | P | — | 0.040 | Residual impurity |
| Sulphur | S | — | 0.030 | Residual impurity |
Nominal: Ni-28Mo-5Fe (the original chromium-free Ni-Mo "alloy B"). Outstanding resistance to hydrochloric acid and reducing media; the higher carbon and iron than B-2 make it more prone to weld-HAZ sensitisation.
Solution-annealed condition, per DIN 17744/17750 for W.Nr. 2.4800/2.4810.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥760 | MPa |
| 0.2% proof strength (Rp0.2) | ≥350 | 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 | Among the highest of any nickel alloy |
| Hydrogen chloride gas | Outstanding | Exceptional resistance |
| Sulphuric acid (medium conc.) | Excellent | Resists non-oxidising H₂SO₄ |
| Acetic / phosphoric / organic acids | Excellent | Strong reducing-acid resistance |
| Reducing environments | Outstanding | High Ni + Mo |
| Chloride SCC | Very Good | Good resistance |
| Weld HAZ (as-welded) | Caution | Higher C than B-2; can sensitise — prefer B-2 for as-welded service |
| 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: ~1060–1080 °C, followed by rapid air cool or water quench Purpose: dissolves secondary phases, restores corrosion resistance and ductility.
Service caution: avoid prolonged exposure to ~700–870 °C, which promotes ordered Ni₄Mo (β) phase and embrittlement; in oxidising atmospheres limit to ~540 °C.
Weldable with controlled heat input. Note: the original alloy B has a higher carbon content than B-2, so the weld heat-affected zone can be susceptible to carbide precipitation and intergranular attack; a post-weld solution anneal is advisable for aggressive acid service, or the low-carbon B-2 should be specified for as-welded service.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching Ni-Mo filler (W.Nr. 2.48xx type) |
| GMAW / MIG | Good | Matching Ni-Mo filler (W.Nr. 2.48xx type) |
| SMAW / stick | Good | Matching Ni-Mo electrode |
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 | Cold-formable; 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, acid storage tanks, heat exchangers, piping | HCl + reducing-acid resistance |
| Sulphuric / acetic / phosphoric acid | Process vessels and piping | Non-oxidising acid resistance |
| Pharmaceutical | Reactors, pressure vessels | Corrosion resistance |
| Petrochemical | Reducing-environment process hardware | Reducing-acid resistance |
| High-temperature (reducing/vacuum) | Components needing low thermal expansion | Low CTE; reducing-atmosphere stability |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Rod and bar | DIN 17752 | Solution-annealed |
| Plate, sheet and strip | DIN 17750 | Solution-annealed |
| Seamless tube | DIN 17751 | Solution-annealed |
| Composition / designation | W.Nr. 2.4800 / 2.4810 | Ni-Mo reducing-acid grade |
| Welding consumables | Matching Ni-Mo filler | — |
Werkstoff-Nummer 2.4800 / 2.4810; listed in ISO 15156-3 / ISO 15156 for sour service.
| W.Nr. | Ni % | Cr % | Mo % | Other | Best Used For |
|---|---|---|---|---|---|
| 2.4810 | bal | ≤1.0 | 26–30 | Fe 4–6, C ≤0.05 | Original Ni-Mo; HCl + reducing acids |
| 2.4617 | bal | ≤1.0 | 26–30 | Fe ≤2, C ≤0.02 | Low-C improvement; as-welded service |
| 2.4600 | bal | 1.0–3.0 | 28.5 | Fe 1–3 | Best thermal stability; HCl service |
| 2.4819 | bal | 14.5–16.5 | 15–17 | W 3–4.5 | Oxidising + reducing; broad corrosion |
| 2.4602 | bal | 20–22.5 | 12.5–14.5 | W 2.5–3.5 | Best pitting/crevice; mixed acids |
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