Steel tube

round rodfor general purposeshigh-strength

Product overview
The 20MnV6 induction-hardened, chrome-plated rod is designed for hydraulic cylinder applications requiring high fatigue resistance, excellent surface hardness and long service life. Manufactured from micro-alloyed 20MnV6 steel, the rod is precision centerless ground, induction hardened to HRC 50–62 at the surface while maintaining a tough ductile core, then finished with a hard chrome plating to ensure low friction and corrosion resistance.

Key information

• Model: Induction And Hardened
• Brand: EAST AI
• Material: 20MnV6
• Length: Max. 15 m (page also lists up to 8000 mm in table)
• ID Tolerance: f7 / f8 / g6 (table lists f7 / h7)
• Straightness: ≤ 0.2/1000 mm (page also lists ≤ 0.2 mm/m)
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Anti-rust oil on rod surface; each rod packed in paper roll then wooden case; customizable packing options
• Roughness: Ra ≤ 0.2 μm

Advantages

• High surface hardness (HRC 50–62) for enhanced wear resistance
• Excellent fatigue strength suitable for high-pressure hydraulic systems
• Low-friction chrome layer reduces seal wear and heat generation
• Tough core maintains impact tolerance and prevents brittleness
• Premium surface finish for smooth piston operation
• Extended service life in demanding or corrosive environments
• Suitable for heavy-duty hydraulic machinery

Technical specifications

• Steel grade: 20MnV6 (EN10297-1)
• Surface hardness: HRC 50–62 (induction hardened)
• Chrome plating thickness: 20–30 μm (customizable)
• Surface roughness: Ra ≤ 0.2 μm
• Yield strength: ≥ 520 MPa
• Tensile strength: 650–850 MPa
• Straightness: ≤ 0.2 mm/m
• Tolerance: f7 / h7 (examples also f7 / f8 / g6)
• Outer diameter range: Ø 10–Ø 200 mm
• Length (table): Up to 8000 mm
• Corrosion resistance: ≥ 120 hours salt spray test (ISO 9227)

Applications

• Hydraulic cylinders (mobile & industrial)
• Construction machinery (excavators, loaders, dozers)
• Agricultural equipment (tractors, harvesters)
• Mining machinery
• Lifting and hoisting systems
• Material handling solutions
• Industrial automation
• Marine hydraulic systems

Manufacturing process

• 20MnV6 raw material inspection
• Cold drawing and peeling
• Precision centerless grinding
• Induction hardening (HRC 50–62)
• Deep stress relieving
• Hard chrome plating
• Final polishing to Ra ≤ 0.2 μm
• Straightness correction
• Final inspection and packaging

Quality control

• Dimensional inspection (OD, roundness, straightness)
• Chromium thickness measurement
• Surface roughness inspection (profilometer)
• Hardness testing (HRC)
• Salt spray corrosion test (ISO 9227)
• Eddy current testing
• Ultrasonic testing (UT)
• Visual inspection for defects and chrome uniformity

Certificates

• ISO 9001:2015 Quality Management System
• ISO 14001 Environmental Management System
• ISO 45001 Occupational Health & Safety Management
• Material Mill Test Certificate (MTC 3.1)
• Salt Spray Test Report (ISO 9227)
• Hardness Test Certificate
• Chrome Layer Thickness Certificate

Characteristics / Technical specifications

• Material: 20MnV6
• Surface hardness: HRC 50–62 (induction hardened)
• Chrome plating thickness: 20–30 μm (customizable)
• Surface roughness: Ra ≤ 0.2 μm
• Yield strength: ≥ 520 MPa
• Tensile strength: 650–850 MPa
• Outer diameter range: Ø 10–Ø 200 mm
• Length: Up to 8000 mm (page also lists max. 15 m)
• Straightness: ≤ 0.2 mm/m
• Tolerance examples: f7 / h7 (also f7 / f8 / g6)
• Corrosion resistance: ≥ 120 hours salt spray (ISO 9227)