1045 | C45 | S45C | EN8

Category
Carbon structure steel
Delivery condition
Hot rolled & Hot forged
Supply form
Round bar, Flat bar, Square bar, Plate, Block, Tube

Introduction:

1045 steel is a medium-carbon steel under the AISI designation system. The "10" denotes plain carbon steel,and "45" indicates ~o.45%carbon content. It typically contains 0.60-0.90% Mn to enhance strength and toughness, 0.15-0.35% sifor deoxidation, and minimal Pand s,which can cause cold or hot brittleness. Equivalent grades include EN/DIN C45E (1.1191), JIS S45C, and GB 45.

Chemical composition:

Corresponding international common brands				Hardness	Chemical Composition (%)
CHINA	US	JAPAN	GERMNAY	Hardness	C	Si	Mn	P	S	Cr	Ni	Mo	V
#45	1045	S45C	1.1730	HB≤299	0.42-0.48	0.15-0.35	0.60-0.90	≤0.03	≤0.035	0.4	≤0.2	≤0.2	-

Characteristics:

Good weldability.
Good machinability.
High strength and impact properties.
But low in hardenability because of lack of suitable alloying elements.

Applications:

Compared with AISI 1020,it has lower alloy content but can be flame or induction hardened for higher strength.
Widely used in industries requiringgreater strength and wear resistance.
Typical applications include: Axles, Bolts, Connecting Rods, Hydraulic Clamps, Rams, Pins, Rolls, Studs, Shafts, Spindles, Sockets, Lightgears etc.

Mechanical Properties

Property	Metric Value	Imperial Value
Tensile Strength	570-700 MPa	82,600-101,500 psi
Yield Strength	310-410 MPa	45,000-60,000 psi
Elongation	12-18%	12-18%
Hardness (HB)	170-210 HB	170-210 HB
Impact Toughness	27 J (average)	20 ft-lb
Modulus of Elasticity	210 GPa	30.5 x 10⁶ psi
Poisson’s Ratio	0.29	0.29
Shear Modulus	80.0 GPa	11600 ksi
Bulk Modulus	163 GPa	23600 ksi

Heat Treatment & Processes

01
Hardening
Heat the steel evenly to 820–840°C until the whole section reaches temperature. Then quench in oil to cool.
02
Normalizing
Heat the steel uniformly to about 900°C to achieve a normalized structure.
03
Annealing
Heat P20 steel to 770–790°C, hold it well at temperature, and then let it cool slowly inside the furnace.
04
Tempering
Heat the steel evenly and hold it for at least 1 hour per 25 mm of thickness at the chosen tempering temperature. Allow it to cool in still air.