Steel tube

round rodfor machiningconstruction

Product Overview
The 4340 Chrome Plated Rod Normalized (HRC 15–22) is a piston rod designed for hydraulic cylinders, heavy machinery and industrial equipment. It provides high strength, controlled hardness and a hard chrome finish to enhance wear and corrosion resistance. Suitable for distributors, stockists and engineering contractors requiring consistent supply and dimensional accuracy.

Advantages

• 4340 alloy steel delivers high tensile strength and good impact resistance.
• Normalized hardness range (HRC 15–22) balances machinability and fatigue resistance.
• Hard chrome plating increases wear and corrosion resistance for longer service intervals.
• Mirror-like surface finish reduces friction in hydraulic and pneumatic systems.
• Precision manufacturing ensures dimensional accuracy and tight tolerances for seals and bearings.
• Applicable to construction, mining, offshore, agricultural, automotive and aerospace components.

Production Process

• Raw Material Selection: 4340 alloy steel sourced for specified mechanical properties.
• Heat Treatment (Normalization): Rods normalized to refine grain structure and stabilize properties.
• Centerless Grinding: Precision grinding for consistent diameter and straightness.
• Polishing: Surface polishing for smoothness and optimal plating adhesion.
• Hard Chrome Plating: Uniform chrome layer applied to enhance wear and corrosion protection.
• Final Inspection: Dimensional and hardness checks to verify compliance.
• Protective Packaging: Anti-rust oil coating, paper roll wrapping and wooden case packing; customizable on request.

Applications

• Hydraulic cylinder rods for mobile and industrial hydraulic systems.
• Construction equipment: excavators, loaders, cranes, bulldozers.
• Mining machinery: high load-bearing components in drilling and excavation.
• Agricultural machinery: tractors, harvesters and implements.
• Offshore & marine equipment requiring corrosion-resistant performance.
• Automotive & aerospace components (structural and suspension applications).

Product Details (table)
Material Grade: 4340 Alloy Steel
Heat Treatment: Normalized
Hardness Range: HRC 15–22
Surface Finish (Ra): 0.2 μm max
Chrome Thickness: 20–30 microns
Diameter Tolerance: f7, h8, h9 (examples listed include f7/f8/g6, etc.)
Straightness: ≤ 0.2 mm/m
Ovality: ≤ 50% of tolerance
Tensile Strength: 930–1080 MPa
Packaging: Anti-rust oil + paper roll + wooden case (customizable)

Factory Inventory & Availability
Diameters available from 12 mm to 350 mm. Standard lengths: 3 m and 6 m; custom cut-to-length services and maximum length up to 15 m available. Large warehouse capacity to support urgent orders and long-term supply.

Quality Testing

• Hardness testing to verify HRC 15–22 compliance.
• Salt spray test to assess chrome plating corrosion resistance.
• Straightness measurement confirming ≤ 0.2 mm/m tolerance.
• Surface roughness check confirming Ra ≤ 0.2 μm.
• Ultrasonic testing (UT) to detect internal defects.
• Dimensional accuracy checks using micrometers.

Certificates
Compliance references: ISO 9001:2015, SGS / BV inspection reports, Material Mill Test Certificates (MTC) and GL approvals where applicable.

Technical specifications

• Model: Normalized
• Brand: EAST AI
• Material: 4340 Alloy Steel
• Heat Treatment: Normalized
• Hardness: HRC 15–22
• Surface Roughness (Ra): ≤ 0.2 μm
• Chrome Thickness: 20–30 microns
• Diameter Range: 12 mm – 350 mm
• Diameter Tolerances: f7, h8, h9 (examples: f7/f8/g6)
• Straightness Tolerance: ≤ 0.2 mm/m
• Ovality: ≤ 50% of tolerance
• Tensile Strength: 930–1080 MPa
• Maximum Length: up to 15 m (custom lengths available)
• Packing: Anti-rust oil, paper roll, wooden case (customizable)
• Typical Applications: hydraulic cylinder rods, construction, mining, agricultural, offshore/marine, automotive & aerospace parts
• Quality Controls: hardness testing, salt spray, UT, straightness and dimensional inspections