1. Key Properties:
Moderate Strength: AISI/SAE 1055 is a medium-carbon steel that offers moderate strength and good hardness, making it suitable for applications where strength is important but not critical.
Good Hardenability: AISI/SAE 1055 responds well to heat treatment processes, achieving enhanced surface hardness while maintaining toughness in the core.
Good Wear Resistance: The material exhibits good wear resistance, especially when carburized and quenched, making it ideal for parts exposed to friction or abrasive conditions.
Machinability: AISI/SAE 1055 offers good machinability in the as-rolled or annealed condition, allowing for easy fabrication and processing.
Weldability: The steel offers moderate weldability, but preheating and post-weld heat treatment are recommended to reduce the risk of cracking, particularly for thicker sections.
Corrosion Resistance: AISI/SAE 1055 has moderate resistance to corrosion. In more aggressive environments, surface coatings or additional treatments may be needed for improved corrosion resistance.
2. Applications/Industries:
Automotive: AISI/SAE 1055 is used in automotive applications, especially for components like gears, shafts, and axles that require medium strength and wear resistance but not extreme strength.
Heavy Machinery: Commonly used in manufacturing parts for heavy machinery, such as gears, crankshafts, and other components that are subjected to moderate stress and wear.
Agricultural Equipment: Due to its good machinability and moderate strength, AISI/SAE 1055 is used in the production of agricultural equipment parts like bearings, gears, and shafts.
General Engineering: Used for general engineering applications, such as axles, spindles, and other medium-strength structural components that require resistance to wear and tear.
Mining: AISI/SAE 1055 is used for mining equipment parts, like shafts and gears, which are subjected to moderate wear and high-stress conditions.
3. Certifications/Standards:
SAE J403: AISI/SAE 1055 conforms to the SAE J403 standard for medium-carbon steels, ensuring it meets the required chemical composition and mechanical properties.
ASTM A519: This standard applies to seamless carbon and alloy steel mechanical tubing, which is relevant for AISI/SAE 1055 seamless pipes.
ISO 9001: Quality management system certification.
4. Chemical Composition:
Carbon (C): 0.52% – 0.60%
Manganese (Mn): 0.60% – 0.90%
Silicon (Si): 0.15% – 0.35%
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Iron (Fe): Balance
5. Technical Specifications:
Yield Strength:
AISI/SAE 1055: 345 MPa (minimum)
Tensile Strength:
AISI/SAE 1055: 545–655 MPa
Hardness:
AISI/SAE 1055: Approximately 170–230 HB (Brinell hardness) in the as-rolled condition. After heat treatment (carburizing and quenching), surface hardness can reach up to 55 HRC.