High-Precision Hydraulic Piston Rods: Hard Chrome Plated & Induction Hardened Shafts
Looking for reliable hydraulic piston rods? Discover our hard chrome-plated shafts crafted from CK45, 42CrMo4, and HY4520. These shafts feature ISO-certified f7/f8 tolerances, high induction hardness (HRC52-58), and exceptional corrosion resistance, making them ideal for heavy-duty cylinders.
Core Material & Chemical Composition
We offer multiple high-strength steel grades tailored to different load and pressure requirements:
Chemical Composition
| Grade | C% | Mn% | Si% | S% | P% | V% | Ni | Cr% | Mo | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| CK45 | 0.42–0.50 | 0.50–0.80 | 0.17–0.37 | ≤0.035 | ≤0.035 | — | ≤0.25 | ≤0.25 | — | ≤0.25 |
| ST52 | ≤0.22 | ≤1.6 | ≤0.55 | ≤0.04 | ≤0.04 | 0.02–0.15 | — | — | — | — |
| 20MnV6 | 0.17–0.24 | 1.30–1.70 | 0.10–0.50 | ≤0.035 | ≤0.035 | 0.10–0.20 | ≤0.30 | ≤0.30 | — | ≤0.30 |
| 42CrMo | 0.38–0.45 | 0.50–0.80 | 0.17–0.37 | ≤0.035 | ≤0.035 | 0.07–0.12 | ≤0.03 | 0.90–1.20 | 0.15–0.25 | ≤0.03 |
| 40Cr | 0.37–0.45 | 0.50–0.80 | 0.17–0.37 | ≤0.035 | ≤0.035 | — | ≤0.30 | 0.80–1.10 | — | ≤0.03 |
| HY4520 | 0.40–0.48 | 0.80–1.40 | 0.15–0.35 | ≤0.035 | ≤0.035 | ≤0.15 | ≤0.25 | ≤0.25 | ≤0.15 | ≤0.25 |
Mechanical Properties (Quenched & Tempered + Induction Hardened)
| Material Grade | Tensile Strength (Rm, MPa) | Yield Strength (Rel, MPa) | Elongation (A%) | Impact Toughness (Charpy) | Surface Hardness |
|---|---|---|---|---|---|
| CK45 (QT+IH) | 800 | 540 | 20 | >41J | HRC52-58 |
| 40Cr (QT+IH) | 1000 | 800 | 10 | - | HRC52-58 |
| 42CrMo4 (QT+IH) | 980 | 850 | 14 | >47J | HRC52-58 |
| HY4520 | 750-900 | ≥520 | ≥19 | KU2 ≥17 | HBW 230-290 / HRC52-58 |
Core Surface Treatment Specifications
| Parameter | Specification |
|---|---|
| Heat Treatment | Quenched & Tempered (core toughness) + Induction Hardening (surface wear resistance) |
| Chrome Plating Thickness | Standard: 0.03mm; Range: 0.03–0.05mm |
| Surface Roughness | Ra ≤ 0.2μm, Rt ≤ 2μm (minimizes seal friction & wear) |
| Outer Diameter Tolerance | ISO f7 / f8 standard |
| Ovality | ≤ ½ of the diameter tolerance |
| Straightness | Φ < 20mm: max 0.3mm/1000mm; Φ ≥ 20mm: max 0.2mm/1000mm |
| Surface Hardness | Min 900HV / HRC 52–58 |
Key Specifications & Surface Treatment
- Heat Treatment: Quenched & Tempered (Q+T) + Induction Hardening
- Core toughness for impact resistance
- Surface hardness: Min 900HV / HRC 52-58 for wear resistance
- Chrome Plating: Hard chrome plating with thickness 0.03–0.05mm (standard 0.03mm)
- Excellent corrosion resistance and low friction coefficient
- Surface Roughness: Ra ≤0.2μm, Rt ≤2μm (reduces seal wear, ensures smooth operation)
- Dimensional Tolerances:
- Outer diameter: ISO f7/f8 standard
- Ovality: ≤ half of tolerance
- Straightness: Max 0.3mm/1000mm (Φ<20mm); max 0.2mm/1000mm (Φ≥20mm)
Quality & Performance Testing
- Thermal Shock Resistance: No cracks after heating to 300°C + water quenching
- Porosity: ISO 1456/1458 tested, ISO 4540 rating 8-10
- Residual Magnetism: ≤50 Gauss
- Corrosion Resistance: ASTM B117 salt spray test (120 hours), ISO 4540 rating 7-10
- Weldability: Excellent for custom machining and assembly
- Certificates: Full material, heat treatment, and chrome plating certifications provided
Packaging & Logistics
- Anti-rust oil applied to all surfaces to prevent oxidation
- Each piston rod individually packed in protective paper sleeves
- Seaworthy wooden box packaging for safe transportation
Application Scenarios
Ideal for use in:
- Construction machinery hydraulic cylinders
- Mining equipment
- Agricultural machinery
- Industrial automation systems
- Marine and offshore hydraulic systems
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