C20 Chemical Composition:

Element	C	Mn	Si	S (Max)	P (Max)
Content %	0.17-0.23	0.30-0.60	0.10-0.40	≤0.045	≤0.045

C20 Mechanical Properties:

Property	Metric	Imperial
Tensile Strength	425 MPa	61,600 psi
Yield Strength	360 MPa	52,200 psi
Shear Modulus	80.0 GPa	11,600 ksi
Bulk Modulus	140 GPa	20,300 ksi
Elastic Modulus	190-210 GPa	27,557-30,458 ksi
Poisson’s Ratio	0.27-0.30	0.27-0.30
Elongation at Break	0.15	0.15
Reduction of Area	0.4	0.4
Brinell Hardness	121	121
Knoop Hardness	140	140
Rockwell B Hardness	68	68
Vickers Hardness	126	126
Machinability Rating	65	65

C20 Hardness:

The typical hardness of C20 steel is 121 HB, making it suitable for general-purpose machining and applications requiring moderate hardness.

C20 Heat Treatment:

Heat treatment varies based on the shape and size of the component. C20 steel is not ideal for heat treatment like higher carbon steels (e.g., EN8 or EN9), but if necessary, heat to 880-910°C, quench in water, and temper accordingly.

C20 Hardening:

For hardening, heat to 880-910°C, quench in water, and temper. This is typically only done if enhanced hardness is required.

C20 Tempering:

C20 can be tempered to adjust hardness and improve toughness, though it is typically not subjected to heavy heat treatments.

C20 Physical Properties:

Property	Metric	Imperial
Annealed Hardness	HBS 156 max	HBS 156 max
Tensile Strength	≥ 400 MPa	≥ 58,000 psi
Yield Strength	≥ 270 MPa	≥ 39,000 psi
Elongation	≥ 27%	≥ 27%

C20 Thermal Properties:

Property	Metric	Imperial
Thermal Conductivity	51.9 W/mK	360 BTU in/hr.ft².°F

C20 Forging Properties:

C20 is easy to forge and can be heated to the recommended temperature for forging, generally around 880-910°C.

C20 Stress Relieving:

Stress relieving can be conducted on C20 steel by heating to a moderate temperature after machining to remove internal stresses.

C20 Normalizing:

For normalizing, C20 steel is heated to 880-910°C and allowed to cool in air to refine the grain structure and enhance its machinability.

C20 Annealing:

Annealing is recommended by heating the steel to 880-910°C, followed by slow cooling in the furnace to ensure maximum machinability.

C20 Density:

The density of C20 steel is typically around 7.85 g/cm³, providing a good balance between weight and strength.

C20 Machinability:

C20 steel has good machinability, rated at 65%, making it suitable for turning, milling, and drilling operations. Proper lubrication and moderate cutting speeds enhance surface finish and machinability.

C20 Welding:

C20 can be welded easily using conventional methods. Preheating is typically not required for thin sections, but thicker sections may benefit from preheating to avoid cracking.

Titan Steel & Engineers Related Products:

Carbon Steel, Alloy Steel, Bright Steel, Spring Steel, Die Steel & Tool Steel, Special Alloy Steel

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