Steel round rod

for general purposeshigh-strengthfatigue-resistant

Product Overview
The ST52 Chrome Plated Rod Quenched and Tempered (HRC 25-32) by EAST AI is a precision-engineered piston rod for hydraulic and pneumatic systems. Manufactured from seamless ST52 steel and heat-treated to HRC 25–32, it features precision grinding and hard chrome plating to improve corrosion and wear resistance for extended service life in demanding industrial environments.

Key Features

• Optimized mechanical properties: quenching and tempering deliver a balanced combination of hardness, strength and toughness.
• Corrosion protection: hard chrome plating reduces rust and pitting in aggressive environments.
• Enhanced wear resistance: hardened surface minimizes abrasion and extends sealing life.
• High straightness and dimensional accuracy: tight tolerances support stable hydraulic performance.
• Good fatigue resistance: suitable for repetitive loading and high-pressure service.
• Wide applicability: construction, agricultural, lifting, marine and automation equipment.

Model & Basic Information

• Model: Q + T
• Brand: EAST AI
• Material: ST52 (seamless)
• Length: up to 15 m (standard up to 8 m; custom cuts available)
• ID Tolerance: f7 / f8 / g6, etc.
• Straightness: ≤0.2 mm / 1000 mm
• Packing: anti-rust oil on rod; each rod wrapped in paper and packed in wooden case; customizable packaging available
• Surface roughness: Ra ≤ 0.2 μm

Production Process

• Raw material selection: high-purity ST52 steel
• Quenching and tempering: controlled heat treatment to HRC 25–32
• Peeling and grinding: remove surface defects and ensure dimensional control
• Polishing: precision polishing to prepare surface for chrome adhesion
• Hard chrome plating: uniform chrome layer for improved wear and corrosion resistance
• Final inspection: tests for roughness, hardness and straightness before shipment

Product Details

• Material grade: ST52 (DIN 2391 / EN 10305)
• Heat treatment: quenched and tempered
• Hardness range: HRC 25–32
• Surface treatment: hard chrome plating
• Chrome thickness: 20–30 μm (customizable)
• Surface roughness (Ra): ≤0.2 μm
• Straightness tolerance: ≤0.2 mm / 1000 mm
• Outer diameter range: 8 mm – 350 mm
• Length range: up to 8 m (custom cuts); max noted up to 15 m
• Tensile strength: 600–850 MPa (dependent on diameter)
• Yield strength: ≥355 MPa
• Standards: DIN 2391, EN 10305, ISO 9001, GL approval

Applications

• Hydraulic cylinders: piston rods for construction and industrial hydraulics
• Lifting equipment: cranes, hoists and elevators
• Earthmoving machinery: excavators, bulldozers and loaders
• Marine environments: enhanced chrome protection against saltwater corrosion
• Industrial automation and mining: precision rods for presses and abrasive conditions

Quality Testing

• Hardness testing: verification of HRC 25–32
• Salt spray testing: assessment of chrome corrosion resistance
• Surface roughness measurement: confirm Ra ≤0.2 μm
• Straightness inspection: prevent rod-induced cylinder wear
• Ultrasonic and eddy-current testing: detect internal and surface defects
• Dimensional inspection: ensure compliance with ISO and DIN tolerances

Certificates

• ISO 9001:2015 (quality management)
• ISO 14001:2015 (environmental management)
• Third-party testing reports (SGS / TUV / BV)
• Material test certificates (EN 10204 3.1 / 3.2)
• GL approval for marine/offshore material manufacturers

Technical specifications

• Material: ST52 (DIN 2391 / EN 10305)
• Heat treatment: quenched and tempered
• Hardness: HRC 25–32
• Surface: hard chrome plating
• Chrome thickness: 20–30 μm (customizable)
• Surface roughness (Ra): ≤0.2 μm
• Straightness tolerance: ≤0.2 mm / 1000 mm
• Outer diameter: 8–350 mm
• Length: up to 8 m standard; up to 15 m max
• Tensile strength: 600–850 MPa
• Yield strength: ≥355 MPa
• Applicable standards: DIN 2391, EN 10305, ISO 9001, GL approval