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Medium strength steel: JIS S45C, C45, ASTM A29, AISI 1045


S45C is a medium strength steel. Suitable for shafts studs, keys etc. Available as rolled or normalised. Supplied as square bar, or round bar or flat. They are excelling in weldability & machinability , and they can be subjected to various heat treatments. Based on JIS G 4051-2009

S45C Mechanical Properties

  • Density (kg/m3) 7700-8030
  • Young’s Modulus (GPa) 190-210
  • Tensile Strength (Mpa) 569 (Standard) 686 (Quenching, Tempering)
  • Yield Strength (Mpa) 343 (Standard) 490 (Quenching, Tempering)
  • Poisson's ratio 0.27-0.30

S45C Hardness

Brinell Hardness (HB) 160-220 (Annealed)

JIS S45C Equivalents

  • DIN Equivalents for JIS S45C

C45, CK45, CF45, CQ45
  • ASTM Equivalents for JIS S45C

ASTM A29 , ASTM A510 , ASTM A519 , ASTM A576 , ASTM A682
  • SAE Equivalents for JIS S45C

SAE J403 , SAE J412 , SAE J414
  • AISI Equivalents for JIS S45C

AISI 1045, AISI 1046
  • EN Equivalents for JIS S45C

EN-8 / BS 970 080M40

S45C Chemical Composition

Carbon (C) 0.42% – 0.48%
Silicon (Si) 0.15% – 0.35%
Manganese (Mn) 0.6% – 0.9%
Phosphorus (P) 0.030% Max
Sulphur (S) 0.035% Max

Heat Treatment

The following temperature ranges are applicable for the respective heat treatment operations.
Full Annealing 800 - 850°C
Normalising  840 – 880°C
Hardening 820 – 860°C
Quenching medium Water or Oil
Tempering 550 – 660°C

Melting Point

Melting point of S45C is ~1520 Degree Celsius


Source: meadinfo.org

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