China C55 Carbon steel is an unalloyed medium carbon engineering steel which has 0.52%-0.6% Carbon as per EN10083 standard.It will obtain high hardness and high strength after hardening due to the relatively high carbon content,and also can be flame or induction hardened to surface hardness Min 58HRC.C55 steel is generally supplied in an untreated or normalised condition.
EN 10277-2: 2008 Bright steel products. Technical delivery conditions. Steels for general engineering purposes
EN 10083-2: 2006 Steels for quenching and tempering. Technical delivery conditions for non alloy steels
EN 10250-2: 2000 Open steel die forgings for general engineering purposes. Non-alloy quality and special steels
C55 is a medium carbon steel suitable for various type of applications where high strength is needed.It is used for components of small cross section requiring low tensile strength, and heavy forgings in the normalized condition for automotive and general engineering such as axles, clutch members, shafts, pressed and punched parts, piston rods and gear racks.
| C | Mn | Ni | P | S | Cr | Si | Mo |
| 0.52-0.6 | 0.6-0.9 | max 0.4 | max 0.045 | max 0.045 | max 0.4 | max 0.4 | Max 0.1 |
| EU | Germany | USA | Russia | Japan | China | Inter |
| EN | DIN,WNr | GOST | JIS | GB | ISO | |
| C55 | 1.0535 | 1055 | 50
55 |
S55C | 55 | C55
C55E4 |
| 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) |
Tensile Strength:min 500 N/mm2 Yield Strength:min. 350 N/mm2
Elongation:min.11 %(l) Kv-Imapct value:min.55J (l)
Normalizing:825℃-885℃,Cooling in air
Soft Annealing:650℃-700℃,Cooling in furnace
Hardening:870 – 990°C,water or oil quench
Tempering:550°C – 660°C,Cooling in air
Drawn and hot-rolled bars, flat bars C55, 1.0535
Forgings and forged bars in grade C55, 1.0535
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