ST52.3 Cold Drawn Seamless Rectangular Hollow Section
1. Overview
Seamless rectangular hollow sections, also referred to as hollow rectangular tubes or rectangular hollow steel tubes, are made from high-quality hot rolled seamless steel pipes.
Unlike welded hollow sections, these products are processed through hydraulic cold drawing, ensuring:
At Chengxin, we manufacture ST52.3 cold drawn seamless rectangular tubes, widely used in engineering structures, frames, bridges, and other mechanical applications requiring strength, precision, and weldability.
2. Commodity Name
ST52.3 Cold Drawn Seamless Rectangular Hollow Section (Non-welded)
3. Available Steel Grades
ASTM A519: SAE1020, 1026, 1045, 4130, 4140, 4340, 8620
DIN 2391-2: ST35, ST44, ST52
EN 10305-1 / 10305-4: E195, E235, E355, 25CrMo4, 42CrMo4
GB/T 3639: 10#, 20#, 45#, 16Mn, Q345 Series, 27SiMn
4. Size Range
Section Type | Dimensions |
|---|
Rectangular OD | 80mm × 60mm – 300mm × 200mm |
Wall Thickness | Up to 35mm |
Length | Up to 12 meters or customized |
5. Manufacturing Method
6. Delivery Condition
Code | Condition |
|---|
BKW | Cold drawn (soft) |
BKS | Stress relieved |
GBK | Annealed |
NBK | Normalized |
+LC, +SR, +A, +N on request |
|
7. End Finish
8. Surface Protection & Packing
Inner and outer oil coating
Bundled with steel strips
External PVC or knitted bags
Custom marking & export packing available
Key Features
100% seamless hollow rectangular tube, non-welded
Excellent straightness and torsion resistance
Precise wall thickness and corner radii
Ideal alternative to square & round hollow section pipe
Compatible with heavy-duty structural applications
Applications
Our hollow section rectangular and hollow section square tube products are widely used in:
Steel structure frames and bridges
Construction and architectural support systems
Machinery bases and modular structures
Transportation equipment
Agricultural and greenhouse structures
FAQs
Q1: Is this a welded or seamless rectangular hollow section?
A: Our rectangular hollow sections are seamless, made from hot rolled pipe and cold drawn—not welded.
Q2: What is your MOQ?
A: Normally 5 tons per size. For non-standard grades or sizes, please contact us for details.
Q3: Can I request custom dimensions or processing?
A: Yes. We support size customization, precision cutting, chamfering, and CNC processing.
Q4: What is your average lead time?
A: Typically 30–45 days, depending on size and processing requirements.
Q5: What quality assurance measures are in place?
A: We source from leading steel mills and perform strict inspections throughout production—chemical, dimensional, mechanical, and surface quality.
Company Profile
Chengxin is a leading manufacturer of cold drawn, cold rolled, and hydraulic cold drawn seamless steel tubes, with over 20 years of industry experience.
Factory Overview:
32,000㎡ facility
12 workshops
2 hydraulic cold drawing benches
4 chain cold drawing lines
2 ERW mills
In-house straightening, honing, turning, and testing lines
We are committed to supplying hollow section steel tubes and custom seamless tubular solutions for global clients across construction, machinery, and infrastructure industries.
