Our Manufacturing Process Of ST52 Seamless Tubing?

Our Manufacturing Process Of ST52 Seamless Tubing?

ST52  seamless tubing is indispensable. As a leader in precision tube manufacturing, we 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 seamless cold drawn tube supplier from the rest.

Material Properties of ST52 Steel

Chemical Composition & Mechanical Strength

  • ​ST52 Steel (DIN EN 10305-1)​: A low-carbon manganese steel (C ≤0.17%, Mn 0.35–0.65%) with excellent weldability and formability.
  • ​Tensile Strength: ≥410 MPa (yield strength ≥255 MPa), optimized for load-bearing applications.
  • ​Elongation: ≥25% (in 50 mm gauge length), ensuring ductility for forming and bending.

Why Anbao Seamless Tubes?​
Seamless construction eliminates weld seams, delivering:

  1. ​Uniform Stress Distribution: Reduced risk of fatigue failure in dynamic applications.
  2. ​Superior Surface Finish: Roughness Ra ≤1.6 µm for reduced friction in hydraulic systems.
  3. ​Consistent Dimensional Tolerances: Outer diameter (OD) precision ±0.1 mm, wall thickness tolerance ≤±10%.

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.

Quality Certifications & Compliance Of ST52 Seamless Tubing

  • 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%).