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 DS is a heat-resistant nickel-iron-chromium alloy with a deliberate silicon addition. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
A general-purpose heat-resisting material, Alloy DS combines high nickel and chromium contents with about 2% silicon to give good oxidation and scaling resistance up to about 1100 °C (2000 °F), particularly under cyclic conditions of heating and cooling. The high silicon and chromium contents give it excellent resistance to carburisation — superior to standard alloy 330 — and good resistance to nitrogen-containing atmospheres with low oxygen content. It has a solid-solution composition with small amounts of precipitated titanium nitride and carbide, is not hardenable by heat treatment, and offers good high-temperature strength with excellent workability and weldability. It is supplied in the annealed and solution-treated condition.
Typical applications include industrial heating-furnace components, muffles, retorts, conveyor systems, carburising boxes and baskets, alloy grids, flare tips, and boiler and furnace fixtures.
| Property | Value | Unit |
|---|---|---|
| Density | 7.94 | g/cm³ |
| Melting range | 1350–1400 | °C |
| Elastic modulus | 196 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 15.5 | µm/m·°C |
| Thermal conductivity (20 °C) | 12.0 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Nickel | Ni | 37.0 | 39.0 | Austenite stabiliser; carburisation resistance |
| Chromium | Cr | 17.0 | 19.0 | Oxidation / scaling resistance |
| Silicon | Si | 1.00 | 2.00 | Enhances oxidation / carburisation resistance |
| Manganese | Mn | — | 1.50 | Deoxidiser |
| Titanium | Ti | — | 0.60 | Forms nitride / carbide |
| Carbon | C | — | 0.10 | Carbide formation |
Annealed condition, typical values for Incoloy DS.
| Condition | Property | Value |
|---|---|---|
| Annealed | Tensile strength (UTS) | ≥550 MPa (80 ksi) |
| Annealed | 0.2% yield strength | ≥230 MPa (33 ksi) |
| Annealed | Elongation at break | ≥30 % |
| Elevated temperature | High-temperature strength | Good; creep-resistant |
| — | Elastic modulus | 196 GPa |
Confirm against the mill test report. Properties depend on product form and condition; the alloy is used annealed or solution-treated.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation | Excellent | To about 1100 °C, incl. cyclic |
| Carburisation | Excellent | High Si + Cr; superior to alloy 330 |
| Nitriding (low-oxygen N₂ atmospheres) | Very Good | Good resistance |
| Chloride stress-corrosion cracking | Very Good | High nickel content |
| Sulfidation | Moderate | Better under oxidizing than reducing conditions |
The high nickel, chromium and silicon contents give excellent resistance to oxidation and carburisation at high temperature; resistance to sulfidation is better under oxidizing than reducing conditions, as sulfide scale tends to spall.
A solid-solution austenitic alloy; not hardenable by precipitation. Properties are set by annealing.
Anneal Anneal (solution treat) at approximately 1020–1150 °C (1870–2100 °F) and cool by water quenching or as fast as possible. Annealing is recommended after hot working. The alloy is not strengthened by heat treatment; cold work raises strength.
Good weldability by the conventional processes for austenitic heat-resistant alloys; neither pre- nor post-weld heat treatment is required. Matching or compatible filler is used.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching / compatible filler |
| GMAW / MIG | Good | Compatible filler |
| SMAW / stick | Good | For heavier sections |
Weld with conventional austenitic-alloy practice and clean surfaces; no pre- or post-weld heat treatment is required.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Requires higher power than mild steel; work-hardens |
| Tooling | Sharp carbide; rigid setups, positive feeds |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Good; work-hardens, anneal between heavy operations |
| Hot forming | 1150–950 °C; water quench / fast cool, anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Industrial furnaces | Muffles, retorts, fixtures | Oxidation + carburisation resistance |
| Heat treatment | Carburising boxes, baskets, grids | Carburisation resistance |
| Process / petrochemical | Conveyor systems, flare tips | High-temperature strength |
| Power / boiler | Furnace and boiler fixtures | Oxidation resistance |
| Product Form | ASTM Standard | ASME |
|---|---|---|
| Bar and rod | ASTM B511 | ASME SB-511 |
| Plate, sheet and strip | ASTM B536 | ASME SB-536 |
| Seamless pipe and tube | ASTM B535 / B546 | ASME SB-535 |
| Wire | ASTM B512 | — |
Nickel-iron-chromium heat-resistant alloy with silicon. Incoloy DS.
| Alloy | Ni % | Cr % | Si % | Best Used For |
|---|---|---|---|---|
| Alloy DS | 37–39 | 17–19 | 1.0–2.0 | High-Cr/Si heat-resistant; carburisation resistance, furnace parts |
| Alloy 330 | 34–37 | 17–20 | 0.75–1.5 | Standard general-purpose heat-resistant alloy |
| Alloy 800H | 30–35 | 19–23 | ≤1.0 | Higher-temperature creep service |
| Alloy RA330 | 34–37 | 17–20 | 1.0–1.5 | Heat-resistant furnace alloy (330 type) |
| Alloy 310S | 19–22 | 24–26 | ≤1.5 | High-temperature oxidation resistance |
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