Hydraulic tube

steelheavy-dutyfor marine applications

Overview
The 40Cr Chrome-Plated Rod Normalized (HRC 15–22) is a precision steel rod designed for hydraulic cylinders and heavy machinery. Normalizing achieves a controlled hardness range (HRC 15–22) while preserving toughness. The hard chrome surface provides wear and corrosion resistance for demanding industrial applications.

Product key data

• Model: Normalized
• Brand: EAST AI
• Material: 40Cr
• Length: Max. 15m (standard up to 6 m)
• ID Tolerance: f7/f8/g6, etc.
• Straightness: ≤0.2 mm/m
• Application: Hydraulic cylinders for mobile equipment, industrial machinery, heavy-duty systems
• Packing: Anti-rust oil on rod surface; each rod in paper roll then wooden case; customizable
• Roughness: Ra ≤ 0.2 μm

Advantages

• Controlled strength and toughness: Normalized to HRC 15–22 for balanced mechanical properties
• High wear resistance: Hard chrome plating delivers a low-friction, durable surface
• Corrosion protection: Chrome layer reduces rust and oxidation in outdoor or humid environments
• Excellent straightness: Precision straightening minimizes deflection in hydraulic pistons
• Dimensional accuracy: Tight tolerances for seal compatibility and easy assembly
• Stable performance: Normalized structure improves fatigue resistance under dynamic loads

Production process

• Raw material selection: Premium 40Cr steel to ensure mechanical strength
• Cutting and rough machining: Bars cut to length and prepared
• Heat treatment (Normalization): Achieve HRC 15–22
• Peeling or grinding: Surface defect removal for plating preparation
• Polishing: Precision polishing for smooth base
• Hard chrome plating: Uniform chrome layer (20–30 μm) for wear and corrosion resistance
• Final grinding & polishing: Mirror finish with Ra ≤ 0.2 μm
• Straightening & quality check: Ensure straightness ≤0.2 mm/m and dimensional accuracy
• Packing & shipping: Protected with oil film, paper, or plastic for transport

Applications

• Hydraulic cylinders: piston rods for construction machinery, agricultural equipment, industrial hydraulics
• Automotive: shock absorbers, steering systems, lifting mechanisms
• Mining & drilling equipment: reliable under extreme conditions
• Heavy machinery: presses, cranes, excavators, loaders
• Marine equipment: port and offshore machinery due to corrosion resistance

Product details
Parameter : Specification
Material : 40Cr Steel
Surface Treatment : Hard Chrome Plating
Hardness : HRC 15–22 (Normalized)
Surface Roughness : Ra ≤ 0.2 μm
Chrome Layer Thickness : 20–30 μm (customizable)
Straightness : ≤ 0.2 mm/m
Diameter Tolerance : f7, g6, h8 or as required
Length : Up to 15 meters (standard up to 6 m; custom lengths available)
Corrosion Resistance : Salt spray tested 96–120 hours
Applications : Hydraulic cylinders, machinery, automotive

Factory inventory & logistics
Common diameters in stock: Ø20 mm to Ø200 mm. Large inventory for urgent needs, fast delivery, customizable sizes, seaworthy export packaging with rust protection.

Quality testing

• Chemical analysis to confirm steel composition
• Hardness test to ensure HRC 15–22 after normalization
• Surface roughness check: Ra ≤ 0.2 μm
• Straightness test: laser and mechanical inspection
• Salt spray test to validate chrome plating corrosion resistance
• Ultrasonic inspection to detect internal defects

Certificates
ISO 9001:2015; Material Test Certificates (EN 10204/3.1); salt spray reports; GL approvals of material manufacturers (AMM); third-party inspection reports (SGS, BV available).

Features / Technical specifications

• Material: 40Cr Steel
• Surface treatment: Hard Chrome Plating (20–30 μm)
• Hardness: HRC 15–22 (normalized)
• Surface roughness: Ra ≤ 0.2 μm
• Straightness: ≤ 0.2 mm/m
• Diameter tolerance: f7, g6, h8 (or as required)
• Length: Max. 15 m (standard up to 6 m; custom lengths available)
• Corrosion resistance: Salt spray tested 96–120 hours
• Typical applications: hydraulic cylinders, machinery, automotive, marine, mining