S355J2G3 Steel - Carbon Manganese High Yield Non Alloy Steel from China Suppliers and Factory
General Characteristics
This grade of steel is carbon manganese, high yield non alloy steel. It is called S355 because of the average minimum yield for this material is 355 Mpa.
As a structural steel, it has excellent strength and weldability. It can be readily welded to other weldable steel. For its low carbon equivalent, it possesses good cold-forming properties. S355J2G3 is generally supplied in a normalized condition.
Designation by Standards
| Mat. No. | DIN | EN | AISI |
|---|---|---|---|
| 1.0570 | St52-3N | - | - |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
|---|---|---|---|---|---|---|---|---|
| max. 0.22 | max. 0.55 | max. 1.60 | - | - | - | - | - | - |
Description & Applications
Description: Unalloyed structural steel.
Applications: Common structural steel for welded assemblies, Re > 355 N/mm2. Guaranteed toughness at 0 oC. It can be used for statically and dynamically stressed constructions.
Physical Properties (average values) at ambient temperature
210 x 103 N/mm2
7.80 g/cm3
Heat Treatment & Processing
Heat to 650-700 oC, cool slowly.
Harden from a temperature of 860-890 oC followed by oil or water quenching.
Normalizing temperature: 860-890 oC.
Hot forming temperature: 1050-850 oC.
Machinability
Machinability is good, rated at 90% that of the 1112 alloy used as a 100% machining rated steel.
Frequently Asked Questions (FAQ)
1. What is S355 / 1.0570 steel?
S355 (Material Number 1.0570, also known as DIN St52-3N) is a carbon manganese, high-yield non-alloy structural steel. It is defined by its average minimum yield strength of 355 MPa, offering excellent strength and weldability properties.
2. What are the key chemical composition limits of this steel?
The chemical composition (in weight %) of S355 / 1.0570 steel includes a maximum Carbon (C) content of 0.22%, a maximum Silicon (Si) content of 0.55%, and a maximum Manganese (Mn) content of 1.60%.
3. What are the primary applications of S355 steel?
It is widely used as a common structural steel for welded assemblies where Re > 355 N/mm² is required. It guarantees toughness at 0 °C and is suitable for both statically and dynamically stressed constructions.
4. What is the recommended heat treatment for S355 / St52-3N?
The steel can be soft annealed at 650-700 °C (followed by slow cooling), normalized at 860-890 °C, or hardened from 860-890 °C followed by oil or water quenching.
5. How machinable is S355 (1.0570) steel?
S355 steel has good machinability. It is rated at approximately 90% of the machinability of the standard 1112 alloy, which serves as the 100% reference baseline steel for machining comparisons.