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Cold Drawn Steel Tube

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‌Cold Drawn Steel Tube vs. Hot Rolled Steel Tube

 

Comparison Aspect‌

‌Cold Drawn Steel Tube‌

‌Hot Rolled Steel Tube‌

‌Processing Temperature‌

Room temperature (cold working)

High temperature (>1000°C)

‌Raw Material‌

Starts from hot rolled tube or solid billet

Steel billet directly heated, pierced, and rolled

‌Dimensional Accuracy‌

‌Extremely high‌, OD tolerance up to ±0.05mm, uniform wall thickness

Lower accuracy, OD tolerance ~±1mm, wall thickness varies

‌Surface Quality‌

‌Smooth, scale-free‌, Ra ≤ 0.8μm, often ready for use

Rough surface with oxide scale, usually requires pickling or machining

‌Mechanical Properties‌

‌Tensile & yield strength increased by 20-30%‌ (work hardening)

Lower strength, but ‌better ductility and toughness‌

‌Grain Structure‌

Elongated and refined grains, dense microstructure

Recrystallized, uniform grain structure

‌Residual Stress‌

Higher residual stress, typically requires annealing

Lower internal stress, naturally relieved during cooling

‌Weldability‌

Requires annealing before welding to avoid cracking

Good as-welded performance

‌Typical Size Range‌

OD: ‌5-127mm‌, wall thickness down to ‌0.25mm‌

OD: ≥32mm, up to 600mm+, wall thickness up to 75mm

‌Production Efficiency & Cost‌

Complex process, longer cycle, ‌higher cost‌

Continuous production, ‌lower cost, high efficiency‌

‌Main Applications‌

Hydraulic systems, precision automotive parts, aerospace, nuclear heat exchangers

Structural supports, boilers, oil/gas pipelines, bridges

production Process of Cold Drawn Steel Tube

 

product-669-436

 

Advantages of Cold Drawn Steel Tubes

 

‌Advantage‌

‌Description‌

‌High Dimensional Accuracy‌

Outer diameter tolerance as tight as ‌±0.05mm‌, wall thickness variation within ‌±0.05mm‌, straightness < ‌0.5mm/m‌ - ideal for precision engineering.

‌Superior Surface Finish‌

Smooth, scale-free surface with roughness ‌Ra ≤ 0.8μm‌ (down to ‌Ra ≤ 0.4μm‌ in precision grades), eliminating the need for secondary machining.

‌Enhanced Mechanical Strength‌

Tensile and yield strength increased by ‌50%-90%‌ due to work hardening; refined grain structure (10-30μm) improves fatigue and pressure resistance.

‌Excellent Material Density‌

Cold drawing compresses internal microstructure, closing pores and voids - resulting in higher integrity and reliability under cyclic loading.

‌Energy Efficient & Sustainable‌

Material utilization rate is ‌3× higher‌ than cutting processes; modern lines reduce water consumption to ‌1.2m³/ton‌, supporting green manufacturing.

‌Broad Customization Capability‌

Available in OD: ‌5-200mm‌, ultra-thin walls (down to ‌0.015mm‌), and various materials (carbon steel, alloy steel, stainless steel like 316L).

‌Direct Application Readiness‌

Pre-treated with pickling, phosphating, and lubrication coatings - ready for cold forming, swaging, or assembly without additional processing.

‌Wide High-End Applications‌

Used in ‌automotive‌ (suspension, battery frames), ‌aerospace‌ (hydraulic systems), ‌medical devices‌ (catheters), and ‌nuclear heat exchangers‌.

 

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