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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.

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Product Details

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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Address: No. 7 Hengtong Road, Yangshan Industrial Park, Huishan District, Wuxi City, Mobile phone: +86-13912380800Telephone: +8651085596218Email: info@wxsbjx.com

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About us

Shi Bang Machinery benefits from a superior, convenient location that enables smooth transportation. Guided by its "Credibility First, Customers Supreme" mission, it provides qualified products. Backed by full-process quality control, the enterprise upholds its commitment to reliable quality, timely delivery, reasonable pricing, and excellent service while working to establish an influential industry brand.