Mechanical Properties
| Yield strength (Rp0.2) | Tensile strength (Rm) | Impact energy (KV) | Elongation (A) | Reduction of area (Z) | Hardness |
| ≥ 451 MPa | ≥ 999 MPa | 23 J | ≥ 41% | ≥ 23% | ≤ 324 HBW |
Duplex Stainless Steel Ground Bars
2750 Super Duplex Steel Round Bar AISI 2507 | UNS S32750
Severe corrosion environments require materials with stronger resistance than standard stainless steel grades can usually provide. S32750 super duplex stainless steel has a PREN value above 40 and offers excellent resistance to seawater, organic acids, inorganic acids, oxidizing media, pitting corrosion, and stress corrosion cracking.
With high chromium, molybdenum, and nitrogen content, S32750 delivers higher strength than traditional austenitic stainless steel while maintaining good impact toughness even at low temperatures. The material can be welded using various methods and usually does not require post-weld heat treatment, helping customers simplify processing while maintaining reliable performance.
Compass Power Tech manufactures S32750 super duplex stainless steel precision ground bars for chemical processing equipment, oil and gas components, seawater treatment systems, corrosion-resistant shafts, and industrial parts exposed to chloride-rich, CO₂, or H₂S-containing environments.
Chemical Composition (%)
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | N |
| 32750 (S32750) | ≤ 0.030 | ≤ 0.80 | ≤ 1.20 | ≤ 0.035 | ≤ 0.020 | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.24–0.32 |
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.
