ST52 precision cold drawn seamless steel tube

ST52  cold drawn seamless steel tube также называется трубами CDS (Cold Drawn Seamless Tube). Широко используется в деталях машин, валах, подшипниках, цилиндрах с прочностью на растяжение 75000 PSD. Представляет собой сплошной стержень из углеродистой стали, который протягивается через оправку для формирования трубы. Доступна в различных размерах.

As a leader in precision tube manufacturing, Bos-Hyd combine advanced metallurgy, cold-drawing technology, and rigorous quality control to deliver tubes that meet the most exacting standards. Below, we break down the technical and operational factors that differentiate a superior ST52 tube supplier from the rest.

ST52 seamless steel tube has better strength and good comprehensive mechanical properties after heat treatment, and is easier to process under heat treatment. It has excellent quenchability, can be deeply quenched and the temper brittleness tendency is less, widely used in the production of high strength steel fasteners such as engine, pressure vessle, gear, transmission parts, shaft, arm, cold forging parts, screw, etc..

Характеристика:

1. Более высокая прочность на растяжение и процентное удлинение по сравнению с хромистыми сталями.

2. В сочетании с Cr и Mo, высокая прокаливаемость, хорошая устойчивость к отпускному размягчению.

3. Хорошая прочность и вязкость.

Quality Certifications & Compliance
Standards: DIN EN 10305-1, ASTM A106/A178, ISO 9001:2015.
Traceability: Full material certifications (Mill Test Reports) with chemical and mechanical properties.
Sustainability: Recyclable lubricants and energy-efficient furnaces (CO₂ reduction of 20%).

Our Manufacturing Process: From Billet to Final Product
Step 1: Billet Preparation
Sourced from premium-grade electric arc furnace (EAF) steel with sulfur ≤0.035%.
Strict billet inspection using ultrasonic testing (UT) to detect internal defects.

Step 2: Cold Drawing Process
Multi-pass Cold Drawing : Achieves precise dimensions and work hardening for enhanced yield strength.
Lubrication System: Polymer-based lubricants minimize friction and surface defects.
Straightening: CNC-controlled straighteners ensure ≤0.5 mm/m bend allowance.

Step 3: Heat Treatment (Optional)
Normalizing: 900–950°C to refine grain structure and improve machinability.
Stress Relieving: 600°C tempering for welded assemblies or high-stress applications.

Step 4: Surface & Dimensional QA
Eddy Current Testing (ECT): Detects surface/near-surface defects (per ASTM E977).
Laser Scanning: Checks roundness, wall thickness, and ovality in real time.
Hydrostatic Testing: 1.5x rated pressure to ensure leak-free performance.