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Characteristics of DIN 17135 A St 45 Steel2025-10-16
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Characteristics of DIN 17135 A St 45 Steel
I. Chemical Composition Characteristics
Low Carbon Design
The carbon content (C) is likely controlled at ≤0.25% to balance strength and weldability, reducing the risk of welding cracks.
Manganese Alloying
The manganese content (Mn) may range from 0.50% to 1.75%, enhancing strength and hardenability while improving low-temperature toughness.
Impurity Control
Phosphorus (P) content is likely ≤0.045%, and sulfur (S) content ≤0.050%, to reduce brittleness and enhance material purity.
II. Mechanical Property Characteristics
Balanced Strength and Toughness
Yield Strength: Likely ≥245 MPa, meeting structural load-bearing requirements.
Tensile Strength: Likely 400–510 MPa, ensuring material integrity under stress.
Elongation: Likely ≥21%, guaranteeing plastic deformation capacity and avoiding brittle fracture.
Impact Energy: Likely ≥27 J (at 0°C), suitable for low-temperature or dynamic load environments.
Lamellar Tearing Resistance
For steel plates with a thickness ≥40 mm, Z-direction performance (e.g., Z15 grade) may be present, providing resistance to welding-induced lamellar tearing and making it suitable for heavy-duty steel structures.
III. Process and Machinability Characteristics
Weldability
The low carbon and low impurity design supports various welding processes, such as submerged arc welding and gas metal arc welding, without requiring complex post-weld heat treatment.
It exhibits low susceptibility to welding cracks, making it ideal for on-site assembly and large-scale structural fabrication.
Formability
The material is easily cut, bent, and stamped. Its performance can be optimized through heat treatments like annealing and normalizing, meeting the demands of complex structural machining.