Posco for Carbon Steel

HIGH-CARBON STEEL

Top Quality Hot Rolled High-carbon Steel from POSCO The final heat treatment provides high strength and hardness to steel with High-carbon content. This high grade steel coil can be used to make major automotive parts and tools that need to be very hard and highly wear resistant.
1. Product Overview Definition and Classifications of High-carbon Steel:- Carbon Steel – Steel that contains at least 0.3% carbon but no other alloy is classified as high-carbon steel. Alloy Steel – Alloy steel contains at least 0.15% carbon as well as various alloys to improve wear resistance, heat treatability and other physical properties.
2. High-carbon Steel Features Processing Features:-
Customers can get the high strength and hardness they need in the final product through heat treatment (quenching/tempering). Quenching and tempering complete the changes of the material properties in the metal. Thus, the temperature and time of these two processes are important factors. (*Quenching & tempering: a martensite transformation for maximum carbon steel hardness.) High strength and hardness can be achieved through the final heat treatment.
  • The excellent hardness gives a better choice for applications requiring high strength and hardness than the low-or medium-carbon steel can provide.
  • The high-strength allows maker to produce lighter automotive parts than when using low-or-medium-carbon steel.
  • The high carbon alloy steel can be used in products that must be highly resistant to wear and deformation such as high-speed sawblades.
  • Excellent resistance to wear and deformation allows the product last longer than when using low-or medium-carbon steel.
3. Major Applications
A) Automotive Parts Parts for automobiles including clutch plates, door latches, safety belt buckles, seat recliners, hose clamps, engine friction plates, impact beams, and washers.
Clutch – Applied specifications:-DN-50CrV4, S50C-S55C, SK85  – Seat Recliner – Applied specification:- SNCM220  – Hose Clamps – Applied specification:- SK85, S45C~S55C  *The normal usage specifications are listed here, but detailed inquiries are needed before placing an initial order to ensure the application is correct.
B) Tools – Shanks – Applied specifications:- SKS51, SCM430/435, SK85 – Knitting Needles – Applied specifications:- SK85 – Sawblade, Measuring Tape – Applied specifications:- SK85~SK120 *The normal usage specifications are listed here, but detailed inquiries are needed before placing an initial order to ensure the application is correct.
C) Other Applications – Machine Chains- Applied specifications:- S35C~S55C, SCM430~SCM435
 – Stationary, Beauty Aids – Applied specifications:- S45C~S50C, SK85~SK120
 – Farming Tools – Applied specifications:- S45C~S55C, SCM435
*The normal usage specifications are listed here, but detailed inquiries are needed before placing an initial order to ensure the application is correct.
D) Key Quality Control Areas for Major Applications.
Application Specifications Points of Special Attention
Manual clutches 50CrV4, S50C, S70C, SK85, SNCM220 Flatness, thickness deviation, mechanical property deviation
Automatic clutches S45C, S55C, SK85 Hardness
Seat recliners SNCM220, S45C, S55C Hardness and dimension
Safety belt buckles S45C, S55C, SCM430 Tensile strength
Automotive hose clips SK85, S45C, S50C, 50CrV4 Hardness
Farm tools S55C, SK85, SUP9, SCM430 Hardness, thickness tolerance
Knitting needles SK85, SK105 Thickness
Sawblades SCM435, SK85, SKS51 Hardness, flatness, crack formation
Chains S45C, S50C, S55C, SCM430, SCM435 Hardness, thickness & width deviation, dimensions
Measuring tapes SK85, S50C Thickness deviation, surface roughness, lateral bend (tape: 0.115t)
Cutter blades SK85, SK105, SK120 Hardness, blage angle when sharpening, edge sharpness
High tensile washers S45C Flatness, hardness
  • When selecting the right specifications for an application, consider the heat treatment after the steel has been processed into the final parts.
  • Heat treatment is a critical part of the production processes performed by the customer. The final quality will depend on heat treatment conditions such as time, temperature and coolant type.
  • The thickness or width tolerance has to be strictly controlled, depending on the application. Therefore, precise identification of the application is necessary.

AVAILABLE SIZES :-

A) 70kg .f/mm2 ≤ TS <80Kg .f/mm2 :-

  • Desired specifications: JS-S55C, SNCM220, JS-SUP9
  • The dimensions that can be produced vary according to TS grade.
The availability of the desired specifications must be confirmed before placing orders.
  • Thickness (mm): 1.6, 1.7, 1.9, 2.4, 2.8, 2.9, 3.2, 4.5, 6.0, 10.0, 13.0
  • Width (mm): 1150, 1200, 1250, 1300, 1350, 1400, 1500, 1550, 1750, 1600

B) TS ≥ 80kg .f/mm2 :-

  • Desired specifications: JS-SCM430, JS-SCM435, SAE1060, SAE4130, SAE4130, DN-50CrV4, JS-SKS51, SAE1070
  • The dimensions that can be produced vary according to TS grade.
The availability of the desired specifications must be confirmed before placing orders.
  • Thickness (mm): 1.8, 1.9, 2.0, 3.7, 4.5, 10.0
  • Width (mm) : 950, 1200, 1250, 1300, 1400

C) TS < 70kg .f/mm2 :-

  • Desired specifications: JS-S45C, POS45FB, SAE1044, SAE1045
  • The dimensions that can be produced vary according to TS grade.
The availability of the desired specifications must be confirmed before placing orders.
  • Thickness: 1.4, 1.5, 1.6, 1.9, 2.4, 2.6, 2.8, 3.2, 6.0, 17.0
  • Width: 1150, 1250, 1350, 1400, 1450, 1500, 1550, 1650, 1840
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