Product

China C25 Carbon steel

5/5

China C25 Carbon steel is an unalloyed low carbon mild steel grade supplied as a hot rolled or bright drawn finish bar. As a low carbon steel grade, it provides low strength with good machinability and is suitable for welding.

Reference standard

EN 10250-2: 2000 Open steel die forgings for general engineering purposes. Non-alloy quality and special steels

Application

Steel grade 25 is used to make flanges, bolts, axles, shafts, latches, washers, levers, other fastenings and non-critical parts, e.g. screws, bushes, etc. This steel is widely used for the manufacture of parts subjected to thermochemical treatment (carburizing, nitrocarburizing, nitriding, boriding), which provides high surface wear resistance and hardness with low core strength.

Chemical composition

C Mn Ni P S Cr Cu Si Cr
0.22-0.29 0.4-0.7 max 0.4 max 0.045 max 0.045 max 0.4 max 0.25 max 0.4 max 0.4

Equivalent Grades

EU Germany Russia Inter
EN DIN,WNr GOST ISO
C25 C25 25 C25

Size Tolerance

Surface Finish Size Tolerance Length
Black For Forged condition (0,+5 mm) Multiple Length/Fixed Length
Black For Rolled condition (0,+1mm)
Rough Turned (0,+3mm)

Mechanical properties

  • Tensile Strength:min 450 N/mm2
  • Yield Strength:min. 275 N/mm2
  • Elongation:min.8 %(l)
  • Kv-Imapct value:min.28J (l)

Heat Treatment Conditions

  • +A   Soft annealed/Soft annealing
  • +N   Normalized/Normalizing
  • +QT  Quenched and Tempered
  • +U   Untreated
  • +SR  Stress Relieved

Normalizing:880℃-920℃

Quenching:860 – 920°C

Tempering:550°C – 650°C

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