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
F6NM is a low-carbon soft-martensitic chromium-nickel-molybdenum stainless steel. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
With about 13% chromium, 4% nickel and a small molybdenum addition and very low carbon, 415 (UNS S41500, forging grade F6NM) combines high strength and toughness with good corrosion resistance and weldability. The high nickel and molybdenum allow the carbon to be kept low, giving a soft-martensitic structure with toughness comparable to austenitic grades while retaining the strength of a martensitic steel. It is readily weldable with preheat and post-weld tempering, and is supplied quenched and tempered. It offers good resistance to mild acids, alkalis and moderate chloride concentrations, with service to about 300 °C.
Typical applications include hydroelectric turbine runners and parts, pump and propeller shafts, valve bodies and seats, compressor components, and oilfield and pressure-vessel hardware (including sour-service per NACE MR0175).
| Property | Value | Unit |
|---|---|---|
| Density | 7.7 | g/cm³ |
| Melting range | 1400–1450 | °C |
| Elastic modulus | 200 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 10.5 | µm/m·°C |
| Thermal conductivity (20 °C) | 25.0 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Soft-martensitic | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 11.5 | 14.0 | Corrosion resistance; martensite former |
| Nickel | Ni | 3.5 | 5.5 | Toughness; structure control |
| Molybdenum | Mo | 0.50 | 1.00 | Pitting / corrosion resistance |
| Manganese | Mn | 0.50 | 1.00 | Deoxidiser |
| Silicon | Si | — | 0.60 | Deoxidiser |
| Carbon | C | — | 0.05 | Low (weldability, soft martensite) |
| Phosphorus | P | — | 0.030 | Residual impurity |
| Sulphur | S | — | 0.030 | Residual impurity |
Quenched-and-tempered condition, per ASTM A240 for UNS S41500.
| Condition | Property | Value |
|---|---|---|
| Q&T | Tensile strength (UTS) | ≥795 MPa |
| Q&T | 0.2% yield strength | ≥620 MPa |
| Q&T | Elongation at break | ≥15 % |
| Q&T | Hardness | ~295 HB (≤23 HRC for sour service) |
| — | Elastic modulus | 200 GPa |
Confirm against the mill test report. For sour (H₂S) service per NACE MR0175, hardness is limited to ~23 HRC max.
| Environment | Performance | Notes |
|---|---|---|
| Atmospheric / general | Very Good | Better than 410/420; Mo addition |
| Mild acids / alkalis | Good | At low concentrations |
| Chloride pitting | Moderate | Improved by molybdenum vs 410 |
| Sour service (H₂S) | Good | Per NACE MR0175 at controlled hardness |
| Stress-corrosion cracking | Very Good | Soft-martensitic; good resistance |
Corrosion resistance is well above the standard martensitic 410/420 grades owing to the higher nickel and molybdenum and low carbon; suitable for sour service when hardness is controlled.
A low-carbon soft-martensitic grade; supplied quenched and tempered.
Solution Treatment (Austenitise + Quench) Austenitise at approximately 1000–1050 °C and air or oil quench to form soft martensite.
Temper Temper at approximately 580–620 °C; a double temper is often used to transform retained austenite and develop the best combination of strength and toughness. For sour service, temper to limit hardness to ~23 HRC.
Readily weldable by all standard techniques; preheat to 100–200 °C and post-weld temper. Matching filler or AWS E410NiMo is used. Avoid hydrogen- or carbon-bearing shielding gas.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Very Good | AWS E410NiMo / ER410NiMo |
| GMAW / MIG | Good | ER410NiMo |
| SMAW / stick | Good | E410NiMo electrode |
Preheat 100–200 °C; post-weld temper (or anneal) to restore toughness and corrosion resistance.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Moderate; similar to QT carbon steel of same hardness (~23 HRC) |
| Tooling | Carbide tooling; rigid setup |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Limited (high strength) |
| Hot forming / forging | ~1150–950 °C; quench and temper afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Power / hydro | Turbine runners, blades, shafts | Strength + cavitation / fatigue resistance |
| Oil & gas | Valve bodies, seats, downhole tools | Sour-service strength + corrosion resistance |
| Marine | Propeller and pump shafts | Strength + seawater corrosion resistance |
| Chemical / process | Compressor and centrifuge parts | Strength + corrosion resistance |
| Product Form | ASTM Standard | ASME Code |
|---|---|---|
| Plate, sheet and strip | ASTM A240 | ASME SA-240 |
| Forgings / fittings / flanges | ASTM A182 grade F6NM | ASME SA-182 |
| Bar and shapes | ASTM A479 | ASME SA-479 |
| Castings (equivalent) | ASTM A487 grade CA6NM | — |
| Welding consumables | AWS E410NiMo | — |
Low-carbon soft-martensitic stainless steel. UNS S41500.
| Grade | Cr % | Ni % | Mo % | C % | Best Used For |
|---|---|---|---|---|---|
| F6NM | 11.5–14 | 3.5–5.5 | 0.5–1.0 | ≤0.05 | Soft-martensitic 13-4; turbines, sour service |
| CA6NM | 11.5–14 | 3.5–4.5 | 0.4–1.0 | ≤0.06 | Cast version (J91540) |
| 410 | 11.5–13.5 | — | — | ≤0.15 | Martensitic 13Cr; hardenable |
| 17-4PH | 15–17.5 | 3–5 | — | ≤0.07 | Martensitic PH; higher strength |
| 420 | 12–14 | — | — | ≥0.15 | Martensitic; cutlery / high hardness |
+86 021 3355 6635
+86 133 7189 7780
zcalloy1001@gmail.com
Building E265, No. 2, Lane 158, Gangye Road, Xiaokunshan Town, Songjiang District, Shanghai
