Cold Drawn Welded Steel Tube (CDW) DIN 2393 ASTM A513 Grade ST37-2 ST52.3-Jiangsu Suao Metal Product Co., Ltd.

Cold Drawn Welded Steel Tube (CDW) DIN 2393 ASTM A513 Grade ST37-2 ST52.3

Cold Drawn Welded Steel Tube (CDW) – DIN 2393 | ASTM A513 (ST37-2, ST52-3)
High-Precision CDW Steel Tubes for Hydraulic, Automotive & Industrial Applications
Suao Metal supplies premium Cold Drawn Welded (CDW) Steel Tubes manufactured to DIN 2393a and ASTM A513 standards, available in grades ST37-2 and ST52-3. Our precision-engineered tubes deliver superior strength, tight tolerances, and excellent surface finishes—ideal for demanding industrial applications.

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Key Features & Benefits

·Cold Drawn Precision – Enhances mechanical properties (higher tensile strength, improved hardness).
·Strict Compliance – Meets DIN 2393 (Germany) & ASTM A513 (USA) specifications.
·Smooth Surface Finish – Burr-free, ready for machining, coating, or welding.
·Wide Material Range – ST37-2 (S235JR equivalent) for weldability & ST52-3 (S355JR equivalent) for high-load applications.
·Custom Sizes – Available in various OD, wall thicknesses, and lengths to fit your requirements.

Common Applications

·Hydraulic & Pneumatic Systems (Cylinder tubes, actuator components)
·Automotive Parts (Chassis, transmission, fuel lines)
·Machinery & Bearings (Conveyor rollers, bushings, shafts)
·Construction & Structural Engineering (Scaffolding, support frames)

Standards & Equivalent Grades

Standard	Grade	Key Properties	Equivalent Grades
DIN 2393	ST37-2	Low carbon, good formability	S235JR (EN), Q235B (GB)
DIN 2393	ST52-3	High strength, load-bearing	S355JR (EN), Q355B (GB)
ASTM A513	Type 5 (ERW)	Electric-resistance welded	AISI 1018, 1026

High-Precision CDW Tubes up to 299mm OD – Custom Sizes Available

Complete Size Range

Outer Diameter (OD)	Wall Thickness	Standard Length	Tolerance	Grades Available
8mm - 30mm	0.8mm - 3.0mm	2m - 12m	h9 (DIN 2393)	ST37-2, ST52-3
32mm - 60mm	1.2mm - 5.0mm	2m - 12m	h10	ST37-2, ST52-3
63mm - 120mm	1.5mm - 8.0mm	2m - 12m	h11	ST37-2, ST52-3
121mm - 180mm	2.0mm - 12.0mm	2m - 12m	h11	ST52-3
182mm - 299mm	3.0mm - 20.0mm	2m - 12m	h12	ST52-3

Key Notes:

·All tubes comply with DIN 2393 Part 1/2 and ASTM A513 Type 5
·Special sizes available with OD 300-450mm (MOQ applies)
·Custom lengths up to 12 meters for structural applications
·Surface roughness: Ra ≤ 1.6μm (achievable with secondary processing)

Advanced Production Process

Material Preparation

·Cold-rolled steel strips (DIN EN 10139)
·Chemical composition verified via spectrometer

High-Frequency Welding

·ERW process at 400kHz frequency
·Weld seam annealed for uniform microstructure

Cold Drawing Process

·Multi-stage drawing with tungsten carbide dies
·15-30% cross-section reduction per pass
·Intermediate annealing (650-750°C) between draws
Final Processing

·Rotary straightening (±0.1mm/m straightness)
·Ultrasonic testing (100% coverage)
·Phosphating/oiling for corrosion protection

Technical Comparison: ST37-2 vs ST52-3

Property	ST37-2 (DIN 2393)	ST52-3 (DIN 2393)	ASTM A513 Equivalent
Yield Strength	≥235 MPa	≥355 MPa	Type 5 (1018)
Tensile Strength	340-470 MPa	490-630 MPa	Type 5 (1026)
Elongation (A₅)	≥23%	≥20%	-
Impact Test	+20°C	-20°C	-
Carbon Content	≤0.17%	≤0.20%	-

Typical Applications

·ST37-2: Furniture frames, conveyor rollers, light structural components
·ST52-3: Hydraulic cylinders, truck chassis, crane booms
·Special Uses: Pneumatic systems (ISO 7180), automotive safety parts

Why Choose Our CDW Tubes?

·Dual Certification: Complies with both DIN and ASTM standards
·Mega Inventory: 8,000+ tons in warehouses

Special Services:

1. ID/OD grinding (±0.01mm precision)
2. Zinc plating (up to 20μm coating)
3. Laser cutting for complex geometries

Contact Our Engineering Team:
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