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Precision Ground 1.4418 Stainless Steel Round Bars Low Carbon, Mo-Ni Alloyed for Excellent Weldability & Corrosion Resistance
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xProduct Details
| Products Name | 1.4418 Stainless Steel Bar | Diameter | 10 - 350mm |
|---|---|---|---|
| Length | 6m Or Cutting Any Length As Request | Surface | Black Or Polishing |
| Service | Cutting | Standard | ASTM DIN GB EN |
| Other Products | Round Bar, Square Bar, Flat Bar.etc | Technique | Hot Rolled |
Product Description
Precision Ground 1.4418 Stainless Steel Round Bars Low Carbon, Mo-Ni Alloyed for Excellent Weldability & Corrosion Resistance
Products Specification
| Products Name | 1.4418 Stainless Steel Round Bar |
| Grade |
303,303Cu,304,304L,309S,310S,310H,316L,316Ti,316H,317L,321,329,347,410,415,420, 430F,431,440A/B/C,2205,2507,904l,254SMO,253MA,CD4MCU,XM-19,17-4PH,15-5PH,17-7PH,660,C276,600,601,625,718,800,800H,825,926.etc |
| Products Diameter Range | φ3mm - φ350mm |
| Length | 6m/pcs or cutting any length as request |
| Surface | Pickling finishing, bright finishing |
| Standard | ASTM JIS,GB,DIN EN |
| Service | Cutting |
| Other Shape | Square , Flat, Hexagonal, Round.etc |
| Loading Port | Shanghai Port |
| MOQ | 50 kgs |
Overview
Precision ground 1.4418 stainless steel round bars represent a high-performance engineering solution tailored for demanding applications in aerospace, marine, oil & gas, and precision mechanical systems. Classified under the European standard EN 10088 as X4CrNiMo16-5-1, this low-carbon martensitic stainless steel combines high strength, excellent corrosion resistance, and superior weldability—attributes that make it ideal for components exposed to aggressive environments or requiring stringent dimensional tolerances.
Manufactured to meet the most rigorous industry specifications, our precision-ground 1.4418 bars undergo controlled heat treatment (solution annealing + aging) and surface finishing processes to ensure consistent mechanical properties, tight dimensional accuracy (±0.01 mm), and a smooth surface finish (Ra ≤ 0.8 µm). This enables direct use in high-precision assemblies without additional machining.
Key Features & Benefits
- High Strength-to-Weight Ratio: Ultimate tensile strength up to 1100 MPa after aging.
- Outstanding Corrosion Resistance: PREN ≥ 35; resists pitting, crevice corrosion, and chloride stress corrosion cracking—superior to 316L and 17-4PH.
- Excellent Low-Temperature Toughness: Maintains ductility and impact resistance down to –60°C (Charpy V-notch ≥ 50 J at –40°C).
- Superior Weldability: Can be welded using GTAW, GMAW, or laser methods with minimal risk of cracking; post-weld heat treatment optional but recommended for critical applications.
- Dimensional Stability: Precision grinding ensures straightness < 0.1 mm/m and concentricity within tolerance, reducing assembly time and scrap rates.
- Machinability: Better than austenitic grades due to its martensitic structure in the solution-annealed condition.
Typical Chemical Composition (Weight %)
| Element | C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| Max/Min | ≤0.06 | ≤0.70 | ≤1.50 | ≤0.040 | ≤0.015 | 15.0–17.0 | 4.0–6.0 | 0.8–1.5 | ≤0.02 |
Note: Low carbon content (<0.06%) minimizes carbide precipitation during welding, enhancing intergranular corrosion resistance.
Mechanical Properties (After Standard Heat Treatment)
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | Impact Toughness (–40°C, J) |
|---|---|---|---|---|---|
| Solution Annealed | 750–900 | 550–700 | 15–25 | 220–280 | ≥60 |
| Aged (550°C × 4h) | 900–1100 | 700–900 | 12–18 | 280–350 | ≥50 |
Heat Treatment Process:
- Solution Annealing: 1020–1050°C × 30 min, followed by oil or air cooling.
- Aging (Precipitation Hardening): 480–550°C × 2–4 h, air cooled.
This dual-step process develops a fine dispersion of ε-Cu and Ni₃Ti precipitates, delivering peak strength without compromising toughness.
Physical Properties
| Property | Value |
|---|---|
| Density (20°C) | 7.8 g/cm³ |
| Melting Range | 1420–1460°C |
| Thermal Conductivity (100°C) | 15 W/(m·K) |
| Specific Heat (20°C) | 500 J/(kg·K) |
| Electrical Resistivity | 0.85 µΩ·m |
| Coefficient of Thermal Expansion (20–100°C) | 11.5 × 10⁻⁶ /K |
These properties support stable performance across wide temperature ranges and facilitate thermal management in dynamic systems.
Applications
Thanks to its balanced combination of strength, corrosion resistance, and fabricability, 1.4418 is widely used in:
- Marine Engineering: Propeller shafts, rudder stocks, seawater pump components, offshore platform connectors.
- Oil & Gas: Downhole tools, high-pressure valves, subsea manifolds, sour service equipment (H₂S environments).
- Aerospace: Landing gear parts, turbine blades, fasteners requiring high fatigue resistance.
- Energy: Hydro turbine runners, nuclear reactor internals, steam generator tubes.
- Precision Machinery: High-strength spindles, molds, measuring instruments, and wear-resistant shafts.
Over 40% of global 1.4418 consumption occurs in marine and offshore sectors, where its resistance to seawater corrosion is unmatched among martensitic grades.
Machining & Fabrication Guidelines
| Process | Recommended Parameters | Tooling Suggestions |
|---|---|---|
| Turning | Speed: 60–90 m/min; Feed: 0.1–0.2 mm/rev | Coated carbide inserts |
| Milling | Speed: 50–80 m/min; Feed: 0.05–0.15 mm/tooth | Ceramic or PVD-coated tools |
| Drilling | Speed: 15–25 m/min; Feed: 0.05–0.1 mm/rev | Cobalt HSS or solid carbide |
| Grinding | Wheel speed: 20–30 m/s | CBN or aluminum oxide wheels |
Cold forming is feasible in the solution-annealed state (max reduction: 60% for rolling, 40% for drawing). Intermediate annealing at 850°C may be required for severe deformation.
Welding Recommendations
- Preferred Method: GTAW (TIG) with ER2209 filler wire and Ar + 2% O₂ shielding gas.
- Interpass Temperature: Keep ≤150°C to avoid sensitization.
- Heat Input: Maintain between 5–15 kJ/cm.
- Post-Weld Treatment: Full solution annealing (1050°C × 30 min, water quench) is advised for critical corrosion service. Alternatively, localized stress relief at 850°C can reduce residual stresses.
Weldability is significantly better than traditional martensitic steels like 410 or 420 due to lower carbon and higher nickel content, which stabilizes the microstructure.
Comparison with Common Stainless Grades
| Property | 1.4418 | 1.4462 (2205) | 316L | 17-4PH |
|---|---|---|---|---|
| Tensile Strength (MPa) | 900–1100 | 620–800 | 485 | 1310 |
| Yield Strength (MPa) | 700–900 | 450–550 | 170 | 1170 |
| Elongation (%) | 12–18 | 25 | 40 | 10 |
| PREN | ≥35 | ≥35 | ～25 | ～18.5 |
| Weldability | Excellent | Excellent | Excellent | Moderate |
| Cost Efficiency | High (vs. duplex) | Medium | Low | High |
While 17-4PH offers higher strength, it lacks the corrosion resistance and weldability of 1.4418. Conversely, 316L is more ductile but far weaker. 1.4418 strikes an optimal balance for structural components in corrosive environments.
Quality Assurance & Certifications
Our precision-ground 1.4418 round bars are produced under ISO 9001-certified processes and comply with:
- EN 10272 (stainless steel bars for pressure purposes)
- ASTM A743/A744 (cast equivalents: CA6NM)
- NORSOK M-001 (for offshore applications)
- PED 2014/68/EU (Pressure Equipment Directive)
Each batch includes full material test reports (MTRs) with chemical analysis, mechanical testing, ultrasonic inspection (ASTM A388), and surface quality certification.
Available Sizes & Finishes
- Diameters: 10 mm to 300 mm (standard); custom sizes available.
- Lengths: 2000–6000 mm (cut-to-length upon request).
- Surface Finish: Precision ground (h9 tolerance), polished (optional Ra 0.4 µm).
- Packaging: VCI paper + wooden crates for export; moisture-controlled storage.
Why Choose Our 1.4418 Round Bars?
- Consistent Quality: Melted via EAF + AOD for ultra-low impurities (S < 0.015%).
- Traceability: Full heat number tracking from ingot to finished bar.
- Global Supply: Ready stock in Europe, Asia, and North America.
- Technical Support: Metallurgical consultation for heat treatment, welding, and design optimization.
Conclusion
Precision ground 1.4418 stainless steel round bars offer an exceptional blend of strength, corrosion resistance, and fabrication ease—making them the material of choice for engineers facing extreme mechanical and environmental challenges. Whether you're designing a deep-sea valve or an aircraft actuator, 1.4418 delivers reliability where failure is not an option.
“1.4418 stainless steel round bar,” “precision ground X4CrNiMo16-5-1,” “low carbon martensitic stainless steel,” “high strength corrosion resistant bar,” “weldable stainless steel for marine use.”
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