Carbon Steel ST 52 is a high-strength structural carbon steel grade widely used for applications requiring superior tensile strength, good toughness, and reliable performance under load. Manufactured in accordance with DIN standards (commonly DIN 17100), ST 52 is characterized by its higher yield and tensile strength compared to standard mild steels, while still maintaining good weldability and formability. Its balanced chemical composition allows it to be easily fabricated through cutting, bending, and welding without complex heat treatment requirements.
With excellent load-bearing capability, good impact resistance, and uniform mechanical properties, Carbon Steel ST 52 is well suited for heavy structural and engineering applications. It is commonly used in construction frameworks, machine structures, pressure components, shafts, and fabricated assemblies where strength and durability are critical. Due to its cost-effectiveness, availability, and dependable mechanical performance, Carbon Steel ST 52 remains a preferred choice for industries demanding strong, weldable, and versatile structural steel solutions.
Forged bars with refined grain and enhanced strength
Excellent resistance to impact and fatigue loading
Reliable performance in high-stress environments
Preferred for heavy engineering and industrial applications
CARBON STEEL ST 52 ROUND BAR EQUIVALENT GRADES
STANDARD
DIN
EN
ASTM
IS
Carbon Steel ST 52
DIN 17100 ST 52
EN 10025 S355JR
ASTM A572 Gr 50
IS 2062 E350
SPECIFICATION OF CARBON STEEL ST 52 ROUND BAR
Size
22 mm up to 800 mm
Thickness
1 – 2 inch
Length
3 meter, 6 meter
Form
Carbon Steel Round, Hex, Flat, Half Round, Oval, Rectangular
in Black & Bright Finish
CHEMICAL COMPOSITION OF CARBON STEEL ST 52 ROUND BAR
Carbon Steel
C
Si
Mn
P
S
Cu
N
ST 52
0.22 max
0.55 max
1.60 max
0.030 max
0.030 max
0.55 max
0.012 max
MECHANICAL PROPERTIES OF CARBON STEEL ST 52 ROUND BAR
Steel Grade
Material No.
The Final Delivery Condition (No less than)
Cold Drawn (BK1)
Cold Drawn Soft (BKW1)
Cold Drawn & Stress Relieved (BKS)
Annealed (GBK1)
Normalizing (NBK1)
Rm
A5
Rm
A5
Rm
ReH
A5
Rm
A5
Rm
ReH2
A5
N/mm²
%
N/mm²
%
N/mm²
N/mm²
%
N/mm²
%
N/mm²
N/mm²
%
ST 52
1.0580
640
4
580
7
580
420
10
490
22
490 – 630
355
22
💡 Practical Difference in Use
Use Carbon Steel ST 52 Round Bars when: higher strength, good toughness, and reliable load-bearing performance are required for structural and engineering applications. ST 52 is a high-yield structural carbon steel suitable for applications where durability and weldability are important along with economical material cost.
→ Example: structural supports, shafts, tie rods, machine frames, and fabricated components.
Bright Finished / Machined Carbon Steel ST 52 Round Bars when: improved surface finish, closer dimensional accuracy, and ease of machining are required for engineered parts.
→ Example: machined shafts, pins, bolts, rollers, and precision structural components.
Applications of Carbon Steel ST 52 Round Bars
Carbon Steel ST 52 round bars are selected for applications where higher tensile strength and dependable structural performance are more critical than corrosion resistance.
Construction & Infrastructure: Structural columns, supports, anchor rods, and base plates.
General Engineering: Shafts, pins, brackets, and load-bearing machine parts.
Manufacturing & Fabrication: Welded structures, frames, and heavy-duty assemblies.
When to Choose Carbon Steel ST 52 Round Bars?
Material selection depends on strength requirements, fabrication needs, machining operations, and overall project cost.
Choose Carbon Steel ST 52 Round Bars when:
Higher yield and tensile strength are required than mild steel
Good weldability and structural stability are needed
Cost-effective high-strength material is preferred
Used in construction and general engineering
Cutting, bending, and fabrication are involved
Static and moderate dynamic loads are present
Bright / Machined Carbon Steel ST 52 Round Bars are preferred when:
Tighter dimensional tolerances are required
Smoother surface finish improves fit or performance
Machining operations such as turning or drilling are needed
Uniform quality is important for fabrication
Used in shafts, fasteners, and mechanical assemblies
Consistent surface condition is required
Industries That Use Carbon Steel ST 52 Round Bars
Carbon Steel ST 52 round bars are widely used in industries that demand higher strength, ease of fabrication, and economical structural solutions.
Construction & Infrastructure
Used in load-bearing and structural applications.
Uses
Columns, supports, anchor rods, base plates.
Why Carbon Steel ST 52?
Higher strength, good weldability, and cost efficiency.
General Engineering
Used in fabricated and machined components.
Uses
Shafts, pins, brackets, couplings.
Why Carbon Steel ST 52?
Reliable mechanical properties and easy machining.
Manufacturing & Fabrication
Used in welded frames and assemblies.
Uses
Machine frames, structural parts, supports.
Why Carbon Steel ST 52?
Consistent quality, availability, and structural strength.
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