S55C steel is a steel with a carbon content of about 0.55% according to Japanese standards (JIS).
Steel grades equivalent to S55C steel: 1055 steel, C55 steel, 55 steel, etc.
1. Product charateristics
- High Strength steel with medium carbon content.
- Strong oxidation resistance, High rust resistance, Good polishing.
- Good Strength, toughness and easy heat treatment, suitable for general use.
- High technology, easy to cast, roll, forge, weld, and cut.
- Great bearing capacity.
- Light-weight
- Less susceptible to corrosion
2. Chemical Composition
| 
			 Standard  | 
			
			 Chemical Composition Rate ( Wt, % )  | 
		||||||
| 
			 C  | 
			
			 Si  | 
			
			 Mn  | 
			
			 Ni  | 
			
			 Cr  | 
			
			 P  | 
			
			 S  | 
		|
| 
			 S55C  | 
			
			 0.52  | 
			
			 0.15  | 
			
			 0.6  | 
			
			 
  | 
			
			 0.2  | 
			
			 
  | 
			
			 
  | 
		
| 
			 0.58  | 
			
			 0.35  | 
			
			 0.9  | 
			
			 0.2  | 
			
			 0.5  | 
			
			 0.03  | 
			
			 0.035  | 
		|
| 
			 Steel  | 
			
			 Tensile strengh  | 
			
			 Yield strengh  | 
			
			 Relative Elongation  | 
		
| 
			 N/mm2  | 
			
			 N/mm2  | 
			
			 (%)  | 
		|
| 
			 S55C  | 
			
			 610-740  | 
			
			 365-560  | 
			
			 13  | 
		
| 
			 Steel  | 
			
			 Annealing  | 
			
			 Quenching  | 
			
			 Tempering  | 
			
			 Hardness HRC  | 
		||
| 
			 Temperature (°C)  | 
			
			 Temperature  | 
			
			 Oil  | 
			
			 Temperature  | 
			
			 Air  | 
		||
| 
			 (°C)  | 
			
			 (°C)  | 
		|||||
| 
			 S55C  | 
			
			 ~600  | 
			
			 800~850  | 
			
			 180~200  | 
			
			 45-55C  | 
		||
5. Apllications
- Widely used as mold base, plastic mold.
- used to manufacture machine parts, brick molds, rubber molds, equipment, car details...
- used in shipbuilding, boats, factory structures, petroleum tanks, mechanics, construction mechanics...
- used in machinery manufacturing industry, mechanical industry, boiler.
- used to make plastic molds, molds for tables and chairs, plastic household items.

