SUS440A Hot Rolled Stainless Steel Round Bar
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If you are looking for SUS440A hot-rolled stainless steel round bars with exceptional hardness, wear resistance, and precision performance, Gnee offers the perfect solution. Our SUS440A stainless steel round bars are widely used in cutting tools, industrial shafts, valves, and precision machinery components. We can customize round bars with different diameters, lengths, and surface finishes to meet customer requirements. Each bar comes with a Material Test Certificate (MTC) and quality report to ensure stable and reliable performance. Contact Gnee today to get a quote or discuss your project needs!
Evaluating the 440A material solution
What is SUS440A hot-rolled round bar?
SUS440A hot-rolled round bar refers to a high-carbon, high-chromium martensitic stainless steel according to the Japanese JIS standard, formed into a round bar through hot working (hot rolling). It possesses high hardness, high wear resistance, and moderate corrosion resistance in specific environments (fresh water, steam). It is mainly used in the manufacture of precision wear-resistant parts such as knives, measuring instruments, and bearings.
Gnee's hot-rolled round bars have a uniform grain structure, excellent surface finish, and strict dimensional tolerances, allowing for direct subsequent processing or heat treatment.
SUS440A Hot Rolled Stainless Steel Round Bar Specifications
| Item | Specification |
|---|---|
| Material Grade | SUS440A Martensitic Stainless Steel |
| Standard | JIS G4305 / ASTM equivalent |
| Form | Round Bar (Hot Rolled) |
| Diameter Range | 10 mm – 200 mm (customizable) |
| Length | 1,000 – 6,000 mm (customizable) |
| Surface Finish | Hot Rolled, Pickled or Ground (optional) |
| Heat Treatment | Annealed / Hardenable |
| Certifications | MTC, Chemical Composition Report, SGS/BV (optional) |
Chemical Composition of SUS440A (Typical, wt.%)
| Element | Content |
|---|---|
| Carbon (C) | 0.60 – 0.75% |
| Chromium (Cr) | 16.0 – 18.0% |
| Manganese (Mn) | ≤ 1.0% |
| Silicon (Si) | ≤ 1.0% |
| Phosphorus (P) | ≤ 0.04% |
| Sulfur (S) | ≤ 0.03% |
| Iron (Fe) | Balance |
Mechanical Properties (Typical, as Hot Rolled / Annealed)
| Property | Value |
|---|---|
| Tensile Strength | 700 – 900 MPa |
| Yield Strength | 450 – 600 MPa |
| Elongation | ≥ 15% |
| Hardness (HB) | 180 – 220 (annealed) |
| Machinability | Moderate; improves after annealing |
Applications
SUS440A Hot Rolled Stainless Steel Round Bars are highly suitable for:
Cutting tools: knives, blades, shear components
Industrial shafts: precision shafts for pumps and machinery
Valves and fasteners: wear-resistant parts for fluid systems
Bearings and mechanical components: applications with high surface wear and fatigue resistance
The hot rolled 4–200 mm round bar size ensures flexibility for machining, forging, or CNC processing, optimizing material utilization.
Click to address your project needs
Can SUS440A hot rolled round bars be heat-treated?
Yes. SUS440A is fully hardenable, achieving high hardness and strength after quenching and tempering.
What are the standard sizes of SUS440A round bars?
Typical diameter ranges from 10 mm to 200 mm, length from 1,000 mm to 6,000 mm, with custom sizes available.
How does SUS440A compare with 420 or 440C stainless steel?
SUS440A: Lower carbon than 440C, easier to machine, still high hardness after heat treatment
440C: Higher carbon, maximum hardness, used in precision bearing or cutting tool applications
420: Lower corrosion resistance and hardness than SUS440A
*Test Certificates: Factory test certificate, third-party inspection report, and raw material certificate
Delivery Time: In-stock items ship immediately, customized products have a delivery time of 15-30 days
*Value-added Services: Pre-treatment, parts cutting, third-party inspection, sample service, ultrasonic testing, and dimensional inspection
