Hydraulic pipe

for oilpneumaticplastic

Product Overview
The hollow chrome-plated piston rod manufactured in 20MnV6 steel combines high tensile strength and good machinability with a weight-reducing hollow section. The inner diameter (ID) is delivered not honed (as-drilled finish), making this product suited to non-sealing internal uses or applications where internal surface finish is not critical. Typical outer diameter range is 25–250 mm and standard production lengths up to 6 m (custom lengths up to 15 m possible on request).

Model / Basic Info

• Model: Hollow Chrome Plated Rod
• Brand: EAST AI
• Material: 20MnV6 steel
• Outer diameter: 25–250 mm
• Length: up to 6 m (custom options available; max capability 15 m)
• Application: Hydraulic cylinder piston rods, linear shafts, industrial machinery

Chemical Composition of 20MnV6 Steel
Element | Content (%)
Carbon (C) | 0.17–0.23
Manganese (Mn) | 1.30–1.70
Silicon (Si) | 0.10–0.35
Vanadium (V) | 0.07–0.12
Sulphur (S) | ≤ 0.035
Phosphorus (P) | ≤ 0.035

Key Features

• High tensile strength — suitable for medium and heavy-duty hydraulic applications
• Good machinability — supports cutting, threading and drilling
• Weight-optimised design — hollow core reduces mass while preserving rigidity
• Hard chrome surface — typical layer 20–30 μm for wear and corrosion protection
• Smooth external finish — Ra ≤ 0.2 μm after polishing
• Straightness control — ≤ 0.2 mm/m
• Customisable tolerances — ID/OD tolerances per drawing (examples: f7 / g6)

Specifications
Material | 20MnV6
Surface Treatment | Hard chrome plated
Chrome Layer Thickness | 20–30 μm
Surface Hardness | ≥ 850 HV
Roughness | Ra ≤ 0.2 μm
Straightness | ≤ 0.2 mm/m
ID Condition | Not Honed (as-drilled)
Outer Diameter | 25 mm – 250 mm
Length | Up to 6 m (typical); up to 15 m available on request
Tolerance Examples | f7 / f8 / g6
Typical Applications | Hydraulic piston rods, linear shafts, industrial automation


Manufacturing Process

• Material selection — certified 20MnV6 billets with controlled chemistry
• Drilling/boring — deep-hole drilling or trepanning to create the hollow section
• Heat treatment — normalizing and tempering to achieve required strength and toughness
• Precision turning & grinding — outer diameter and dimensional control
• Hard chrome plating — uniform chrome deposition for wear resistance
• Polishing — external finish to Ra ≤ 0.2 μm
• Final inspection — hardness, roughness, straightness and plating thickness checks under ISO9001 procedures

Applications

• Hydraulic and pneumatic cylinder piston rods
• Material handling and lifting equipment
• Agricultural and construction machinery
• Industrial automation and assembly lines
• Machine tool components and linear guides
• Marine and offshore systems (non-sealing internal ID)

Packaging & Delivery

• Packing: anti-rust oil on rod surface; rods wrapped in protective paper and supplied in wooden crates; plastic film and steel pallet options available
• Delivery time: typically 20–30 days after order confirmation (subject to quantity and specifications)
• Shipping methods: sea, air or multimodal transport
• Main markets: Europe, Russia, Southeast Asia, South America, Middle East

Technical Characteristics

• Material: 20MnV6
• Model: Hollow Chrome Plated Rod
• Surface treatment: Hard chrome plating (20–30 μm)
• Surface hardness: ≥ 850 HV
• Surface roughness: Ra ≤ 0.2 μm (external)
• Straightness: ≤ 0.2 mm/m
• ID condition: Not honed (as-drilled finish)
• Outer diameter range: 25–250 mm
• Length: up to 6 m (custom lengths up to 15 m)
• Tolerances: examples f7 / f8 / g6