1075 Steel
SAE 1075 is a high-carbon spring steel known for its excellent hardness, strength, and wear resistance after heat treatment. This grade is designed for applications requiring high elasticity, resilience, and fatigue strength. It is widely used in springs, blades, cutting tools, and other components where long-term performance under cyclic loading is critical.
grades designations
SAE 1075 is a plain carbon spring steel furnished to a defined chemical composition and corresponding mechanical properties. It contains approximately 0.70–0.80 % carbon and 0.40–0.70 % manganese, with trace amounts of phosphorus and sulfur. Its carbon content provides high hardness potential through quenching and tempering, while controlled manganese levels enhance strength and uniformity. When properly heat treated, 1075 achieves the combination of strength and flexibility that defines spring steels.
SAE 1075 Specifications
Property
specification
Weldability
Due to its high carbon content, SAE 1075 exhibits poor weldability. For applications involving significant joining, lower-carbon steel may be preferred.
Ease of Fabrication
Machining and forming operations are best performed in the annealed state, as hardness increases significantly after heat treatment.
Thermal Cutting
Thermal cutting of 1075 requires controlled procedures to prevent edge hardening. The high carbon content promotes localized martensitic formation when cut by laser or plasma, which can result in brittle edges.
Bendability
1075 offers limited bendability in hardened condition but good formability when annealed.
Hardness
In the fully hardened and tempered (spring) condition, SAE 1075 achieves Rockwell hardness values of approximately 50–55 HRC, depending on section size and tempering temperature.
