Mechanical Properties
| Tensile strength (Rm) | Yield strength (Rp) | Elongation (A) | Hardness |
| ≥ 650 MPa | ≥ 450 MPa | ≥ 25% | ≤ 270 HBW |
Duplex Stainless Steel Ground Bars
1803 Duplex Stainless Steel Round Bar AISI 31803 | UNS S31803
Chloride-rich and corrosive environments can place high demands on precision shaft materials. S31803 duplex stainless steel provides strong resistance to pitting, crevice corrosion, and stress corrosion cracking, making it a reliable option for components exposed to more aggressive operating conditions.
Its ferritic-austenitic duplex structure gives the material higher strength than many conventional austenitic stainless steels while still maintaining good toughness and ductility. With tensile strength generally above 500 MPa, S31803 supports applications where corrosion resistance and load-bearing performance must work together.
Compass Power Tech manufactures S31803 duplex stainless steel precision ground bars for corrosion-resistant shafts, pump and valve components, hydraulic and pneumatic parts, marine-related components, and industrial equipment used in chloride-containing environments.
Chemical Composition (%)
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | N |
| 31803 (S31803) | ≤ 0.03 | ≤ 1.00 | ≤ 2.00 | ≤ 0.03 | ≤ 0.020 | 4.50–6.50 | 21.00–23.00 | 2.50–3.50 | 0.08–0.20 |
Specifications
| Diameter | Tolerance | Roundness | Straightness | Standard Length | Surface Roughness |
| Φ3-Φ25 | 0.1mm/m | g6, h6, f7 | ≤1/2 | 2m 3m | Ra≤0.4 |
| Φ25-Φ40 | 0.1mm/m ≤ | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
| Φ40-Φ80 | 0.1mm/m ≤ | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
| Φ80-Φ150 | 0.05mm/m ≤ | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
| Φ150-Φ180 | 0.05mm/m ≤ | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
Additional Custom Services
- Cut-to-length service: Shaft length can be customized according to customer assembly requirements.
- End chamfering: Both ends of the shaft can be chamfered to simplify downstream machining and installation.
- Drawing-based machining: Shafts can be machined according to customer drawings and supplied as ready-to-assemble components.
- Surface rolling treatment: Surface rolling can be applied to improve surface hardness when higher wear resistance is required.
Packaging and Storage
To protect stainless steel precision ground shafting during sea freight and storage, Compass Power Tech uses anti-rust paper tube packaging. Before wrapping, anti-rust oil is applied evenly to the shaft surface, and anti-rust wax is applied inside the paper tube. This protection process helps reduce corrosion risk during transportation and ensures customers receive shafts in stable, ready-to-use condition.
Looking for Custom Metal Components for Your Application?
We manufacture precision ground shafts, stainless steel tubing, piston rods and aluminum alloy cylinder tubes for hydraulic, pneumatic, machinery, energy and transportation applications. Contact us for material selection, specifications and customization support.
