Precision Ground 440C Stainless Steel Bar - Tool Steel Alternative, ±0.01mm Accuracy
precision-ground 440C stainless steel bar is a revolutionary alternative to traditional tool steels, engineered for ultra-high-wear, high-precision applications where dimensional accuracy and corrosion resistance are non-negotiable. With a hardness of 58–60 HRC and a mirror-like surface finish (Ra ≤0.1μm), this martensitic stainless steel bar combines the edge retention of tool steels with the rust resistance of premium stainless alloys. Ideal for aerospace micro-components, semiconductor manufacturing tools, and luxury watch mechanisms, its ±0.01mm tolerance ensures flawless performance in nanoscale environments. Advanced cryogenic treatment refines carbide distribution, eliminating micro-fractures for extended fatigue life.
2. Technical Specifications
| Parameter | Details |
| Material | 440C Stainless Steel (UNS S44004) |
| Element Composition | C: 0.95–1.20%, Cr: 16–18%, Mo: 0.75%, Mn: ≤1%, Si: ≤1%, Fe: Balance |
| Hardness & Treatment | 58–60 HRC (Vacuum hardened, cryogenically tempered) |
| Dimensional Accuracy | ±0.01mm (Grinding to ISO 2768-fh standard) |
| Surface Finish | Supermirror polished (Ra ≤0.1μm) or TiAlN coating (optional) |
| Mechanical Properties | Tensile Strength: ≥1,960 MPa, Compressive Strength: ≥2,200 MPa |
| Thermal Stability | Serviceable up to 450°C (non-oxidizing environments) |
| Certifications | AMS 5630, ASTM A314, RoHS, ISO 13485 (Medical Grade) |
| Innovation Metrics | Zero Magnetic Permeability (After specific annealing), Vacuum-Compatible |
3. Competitive Advantages
① Nano-Precision Grinding
Diamond-wheel ground bars achieve sub-micron tolerances, critical for MEMS (Micro-Electromechanical Systems) and optical alignment components.
② Corrosion-Meets-Hardness
Chromium carbides in a martensitic matrix resist galling and acid exposure, outperforming D2 or M2 tool steels in humid or chemical-laden settings.
③ Cryogenic Edge Retention
Deep cryogenic tempering enhances wear resistance by 30% compared to standard 440C, ideal for surgical laser parts or fuel injector nozzles.
④ Vacuum & Ultra-Clean Ready
Non-gassing surface finish meets ISO Class 4 cleanroom standards for semiconductor fabrication and space-grade mechanisms.
⑤ Anti-Galling Coatings
Optional TiAlN or DLC (Diamond-Like Carbon) coatings reduce friction coefficients to ≤0.15, extending tool life in high-cycle applications.
⑥ Micro-Deburring Tech
Proprietary edge-blending eliminates sub-5μm burrs, essential for microfluidic chips and biomedical implant machining.
4. Cutting-Edge Applications
- Semiconductor Probe Needles: Ultra-hard, non-magnetic bars for wafer testing in 3nm chip production lines.
- Aerospace Micro-Gears: Precision-ground components for satellite attitude control systems and drone actuators.
- Luxury Horology: Corrosion-proof, antimagnetic balance wheels and escapements for high-end mechanical watches.
- Neuro-Surgical Tools: Scalpel blades and biopsy forceps with sterilizable, non-reactive surfaces.
- Additive Manufacturing Nozzles: Wear-resistant bars for 3D printing tungsten-carbide or ceramic powders.
- Quantum Computing Hardware: Non-magnetic, vacuum-compatible mounts for qubit stabilization systems.
- High-Energy Laser Optics: Mirror-finish bars for beam-steering modules in industrial laser cutters.
Why This Product?
Transcending traditional tool steel limitations, the 440C precision bar bridges the gap between extreme mechanical performance and environmental resilience. Its fusion of sub-micron accuracy, vacuum compatibility, and anti-corrosion properties makes it the material of choice for industries where failure is not an option—from nanotech labs to interstellar exploration.
FAQ
Q: Why choose us?
A: Our company have been in steel business for more than ten years, we are internationally experienced, professional, and we can provide variety of steel products with high quality to our clients.
Q: Can provide OEM/ODM service?
A: Yes. Please feel free to contact us for more details discuss.
Q: How is your Payment Term?
A:One is 30% deposit by TT before production and 70% balance against copy of B/L; the other is Irrevocable L/C 100% at sight.
Q: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.
Q: Can you provide sample?
A: Yes, for regular sizes sample is free but buyer need to pay freight cost.
Q: How long is your delivery time?
A: Our daily inventory is more than 8000 tons, so for common product size, just need 3 days from stocks; if the special size from new production, delivery 15-20 days.
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