SSA1191 Medium Carbon Steel

Type of steel and characteristics:
SSA1191 (JIS S45C, AISI 1045) steel is a versatile and widely used material suitable for a range of engineering applications where moderate strength, toughness, and machinability are required.

Components with small cross sections, requiring with low tensile strength, as well as heavy forging in normalised condition. For general mechanical and automotive engineering, engine construction, e.g. axles, clutch members, shafts, pressed and blank parts, piston rods and gear racks.


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Chemical Composition (%) C Si Mn Cr Mo Ni
0.45 0.40 0.65 0.40 0.10 0.40
Nearest Equivalent DIN CK45 AISI 1045 JIS S45C SIS 1672 UNI C45

Application Areas:

  1. Manufacturing Machinery: SSA1191 carbon steel finds widespread application in machinery manufacturing, serving in the production of gears, shafts, spindles, and forged components due to its remarkable strength and resistance to wear.
  2. Automotive Components: The automotive industry extensively employs SSA1191 steel for critical components like crankshafts, connecting rods, and steering knuckles, benefiting from its exceptional toughness and machinability.
  3. Tool and Die Making: Its favorable machinability and moderate hardness make SSA1191 steel a preferred choice for tool and die making applications, including punches, dies, and molds.
  4. Construction: In construction, SSA1191 carbon steel is utilized in structural elements and reinforcement bars owing to its weldability and strength, contributing to the durability and stability of structures.
  5. General Engineering: From fasteners to hydraulic fittings, SSA1191 steel serves various general engineering needs due to its balanced properties of strength, toughness, and cost-effectiveness.

Technical Characteristics:

  1. Mechanical Properties:
    • Tensile Strength: SSA1191 carbon steel exhibits a tensile strength ranging from 570 MPa to 700 MPa, making it suitable for applications subjected to high stress.
    • Yield Strength: With yield strength typically ranging from 340 MPa to 490 MPa, S45C steel demonstrates good resistance to deformation under load.
    • Elongation: SSA1191 steel typically shows an elongation of 14% to 20%, offering adequate ductility for forming processes.
  2. Hardness:
    • SSA1191 carbon steel can achieve a hardness of approximately 170 to 210 Brinell hardness (HB), depending on the heat treatment, providing excellent wear resistance.
  3. Machinability:
    • SSA1191 steel offers exceptional machinability, facilitating easy operations such as drilling, milling, turning, and grinding, crucial for manufacturing precision components.
  4. Heat Treatment:
    • SSA1191 steel is amenable to various heat treatment processes such as annealing, normalizing, quenching, and tempering, allowing for the adjustment of mechanical properties to suit specific application needs.

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