As a high-quality carbon structural steel, C50 steel is defined as a non-alloy steel with an average carbon content of about 0.50% as per European standards.

As a medium carbon steel, C50 steel has high strength and hardness, medium machinability, but low cold deformation plasticity and poor weldability.

C50 steel is usually used after heat treatment such as normalizing or quenching and tempering, or high-frequency surface quenching.It is usually used for parts that require high strength, wear resistance or elasticity, and small dynamic load and impact load, such as forged gears, machine tool spindles, engine spindles, rolls, tie rods, spring washers, etc.

C50 Carbon steel with normalized condition

C50 STEEL CHEMICAL COMPOSITION

StandardGradeCSiMnPSCrMoNi
EN10250C50/1.05400.47-0.55≤0.40.60-0.90≤0.045≤0.045≤ 0.4≤ 0.1≤ 0.4
SEW550CK50/1.12060.47-0.55≤0.350.60-0.90≤0.035≤0.035---
DIN17200CK50/1.12060.47-0.55≤0.40.60-0.90≤0.035≤0.03---

C50 STEEL RELATED STANDARD & EQUIVALENT GRADE

China | GB 3077:50

USA | ASTM A29:1050

Japan | JIS G4051:S50C

UK |BS970: EN8/EN9

C50 STEEL PHYSICAL PROPERTY

Density, g/cm3 7.86
Specific heat capacity,(0~100℃),J/(kg.k) 498
Linear expansion coefficient,10^-6/k 12.06(0-100℃)
Poisson’s ratio 0.29
Elastic Modulus,Mpa 207407
Shear modulus,Mpa 81100
Thermal conductivity,W/(m.K) 47

C50 STEEL FORGING

  • Initial Forging Temperature:1200℃
  • Final Forging Temperature:850℃
  • Forging Ratio:above 4:1
  • Post-Forging Treatment:C50 steel should be slowly cooling after forged.

C50 STEEL HEAT TREATMENT

Critical Temperature for Heat Treatment of C50 Steel

  • Ac1:725℃
  • Ac3:760℃
  • Ar1:690℃
  • Ar3:721℃

Temperature Selection for Conventional Heat treatment for C50 Steel

  • Annealing:820 – 840°C,Cooling in furnace,hardness below 187 HBW
  • Normalizing:820-870°C,Cooling in air,hardness about 217HBW
  • Quenching:810-850°C,Medium:Water\Oil
  • Tempering:550-660°C

C50 Steel Mechanical Property with Quenched and Tempered Condition

Tensile Strength
Mpa
Yield Strength
Mpa
Elongation
%
Reduction of Area
%
Impact Charpy-V
J
≥630≥375≥14≥40≥31

C50 Steel Tempering Temperature Vs Hardness

GradeQuenchingTempering Temperature,ºC
Temperature,ºC Hardness,HRC150ºC 200ºC 300ºC 400ºC 500ºC 550ºC 600ºC
C50830ºC 58-5958555041332622

Jominy Quenching Test Curve For C50E Steel

Jominy Quenching Test Curve For C50E Steel

Quenching at 850°C

X:Distance from quenched end,in mm

Y:Hardness,HRC

3: H level

HRC-mmType12345678910111315202530
MIN+H565344343130302928272625242320-
MAX63626160585550433635343332312928

Guideline value Curve for C50 Steel Mechanical Property

C50 steel Mechanical property reference curve

X:Tempering temperature,oC

Y:Tensile and Yield Strength,Mpa

Z:Elongation and Reduction in  area,%

WHAT WE SUPPLY FOR C50 STEEL

Hot Forged Round bar:Φ80-Φ1000mm

Hot Rolled  Round bar:Φ16-Φ350mm

Hot Forged Square bar: Max Thickness:500mm

Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11