Cold Drawn Seamless Steel Tube (CDS) DIN 2393 ASTM A519 Grade ST37-2 ST52.3

Cold Drawn Seamless Steel Tube (CDS) - DIN 2393 & ASTM A519 (Grades ST37-2, ST44-2, ST52.3, 1018, 1020, 1026, 27SiMn, 20MnV6)

Overview

Cold Drawn Seamless Steel Tubes (CDS) manufactured to DIN 2393 and ASTM A519 standards deliver exceptional precision for demanding applications. These tubes feature tight dimensional tolerances, enhanced mechanical strength, and superior surface finishes. Available in grades ST37-2, ST44-2, ST52.3, 1018, 1020, 1026, 27SiMn, and 20MnV6, they provide low-carbon and low-alloy options balancing durability, machinability, and cost-effectiveness. Ideal for automotive, mechanical engineering, hydraulics, and energy sectors.

Manufacturing Process

The production of Cold Drawn Seamless Steel Tubes involves a precise cold-drawing method to achieve optimal accuracy and performance. Key steps include:

1. Hot Rolling: Start with piercing heated billets to form a seamless hollow shell, creating the base for further processing.
2. Cold Drawing: Pull the shell through a die and over a mandrel at ambient temperature, reducing dimensions while improving accuracy and finish.
3. Heat Treatment: Apply normalization, annealing, or stress relief based on required conditions to refine properties and ensure uniformity.
4. Surface Finishing: Polish or coat for enhanced smoothness, appearance, and protection against corrosion.
5. Quality Testing: Conduct thorough inspections for dimensions, mechanics, and compliance with DIN 2393 and ASTM A519.

This process yields tubes with greater strength, precision tolerances, and refined microstructures versus hot-finished alternatives.

Material Grades

Available grades cater to diverse needs, with properties detailed below for easy comparison:
Chemical Composition Comparison (Max % unless specified)

Note: Silicon for ASTM A519 grades (1018, 1020, 1026) is often unspecified unless alloyed. Additional elements in 27SiMn (e.g., Cr, Ni, Cu ≤0.30% each) are omitted for simplicity.

Mechanical Properties Comparison

Note: Properties for 27SiMn reflect quenched and tempered states for high-strength use; 20MnV6 values are for as-rolled per EN 10297-1.

Grade Descriptions

·ST37-2 (DIN 2393): Low-carbon steel with superior weldability and formability for structural uses.
·ST44-2 (DIN 2393): Medium-carbon option with elevated strength and reliable weldability for moderate-load scenarios.
·ST52.3 (DIN 2393): Low-alloy high-strength steel for durable, high-demand applications.
·1018 (ASTM A519): Low-carbon grade offering solid machinability and moderate strength for everyday needs.
·1020 (ASTM A519): Excellent machinability and weldability, perfect for carburizing and surface hardening.
·1026 (ASTM A519): Higher-carbon steel with enhanced toughness for durable mechanical parts.
·27SiMn (GB/T 3077): Alloy steel with superior strength post-quenching, ideal for hydraulic and wear-resistant components.
·20MnV6 (EN 10297-1): Vanadium-alloyed low-carbon steel for formable, strong engineering applications like automotive hydraulics.

Specifications

Standards: DIN 2393 (Precision Welded Tubes), ASTM A519 (Seamless Mechanical Tubing), GB/T 3077 (27SiMn), EN 10297-1 (20MnV6)
Size Range:
·Outer Diameter (OD): 6 mm to 325 mm
·Wall Thickness (WT): 1 mm to 35 mm
·Length: Random (10–12,000 mm) or custom-cut
Tolerances:
DIN 2393:
·OD (20–30 mm): ±0.08 mm
·OD (32–40 mm): ±0.15 mm
·OD (42–55 mm): ±0.20 mm
·Wall Thickness: ±7.5%
ASTM A519:
·OD (up to 0.499 in.): ±0.004 in.
·OD (0.500–1.699 in.): ±0.005 in.
·Wall Thickness: ±7.5% to ±10% (depending on size)

Delivery Conditions:
· Cold Finished (Hard) - BK
·Cold Finished (Soft) - BKW
· Stress Relieved - BKS
· Annealed - GBK
·Normalized - NBK
·Quenched and Tempered - Q+T
·Surface Conditions: Polished, bright, metallic, or coated (e.g., galvanized, zinc-coated, or anti-corrosive oil)

Key Benefits

·High Precision: Tight tolerances for perfect fits in precision engineering.
·Superior Strength: Cold drawing boosts yield and tensile values for critical loads.
·Excellent Surface Finish: Seam-free smoothness reduces machining and enhances appearance.
·Improved Machinability: Consistent microstructure for efficient processing.
·Versatility: Custom options in sizes, grades, and treatments for varied needs.
·Corrosion Resistance: Coatings extend lifespan in challenging environments.

Applications

Cold Drawn Seamless Steel Tubes in these grades serve multiple industries:
·Automotive: Axles, shock absorbers, camshafts, and roll cages.
·Mechanical Engineering: Hydraulic cylinders, frames, and precision parts.
·Construction: Supports, columns, and crane elements.
·Energy: Pump components, bearings, and turbine parts.
·Hydraulics and Pneumatics: Shafts, cylinders, and fluid systems.
·General Fabrication: Rollers, spacers, and telescoping supports.

Quality Assurance

·Manufactured to DIN 2393, ASTM A519, GB/T 3077, and EN 10297-1 standards.

·Includes DIN EN 10204 3.1 certificates verifying composition, properties, and accuracy.

·Non-destructive testing (NDT) and surface checks guarantee performance.

Why Choose Our CDS Tubes?

·Custom Solutions: Tailored dimensions, lengths, and treatments for your projects.
·Global Standards Compliance: Meets DIN 2393, ASTM A519, and more.
·Reliable Supply Chain: Standard sizes in stock (0.250"–10.000" OD, 0.035"–1.500" WT) with custom capabilities.
·Expert Support: Guidance on grade selection and specs for optimal results.

Contact us at hongli-jy@126.com or visit hltube.com for quotes. Enhance your projects with precision-engineered Cold Drawn Seamless Steel Tubes.