1.1191 Steel | AISI 1045 | 1.1191 | C45 | S45C

WALDUN is top 1.1191 steel Manufacturer and Exporter in China, can supplied with round,square,flat,block,and shaft etc.

1.1191 steel is defined as medium carbon steel which has 0.43%-0.5% Carbon.It offers good weldability, good machinability, high strength and impact properties,but low in hardenability because of lack of suitable alloying elements,but it can obtain surface hardnesses 54-60HRC after flame or induction hardening. 1.1191 steel is generally supplied in the black hot forged or normalized condition,and has a tensile strength of 570 -700 MPa with surface hardness170-210HB.

1.1191 Steel Supply Form & Size & Tolerance

Supply Form	Size(mm)	Process	Tolerance
Round	Φ6-Φ100	Cold Drawn	Bright/Black	Best H11
	Φ16-Φ350	Hot Rolled	Black	-0/+1mm
			Peeled/ground	Best H11
	Φ90-Φ1000	Hot Forged	Black	-0/+5mm
			Rough Turned	-0/+3mm
Flat/Square/Block	Thickness :120-800	Hot Forged	Black	-0/+8mm
	Width:120-1500		Rough Machined	-0/+3mm

Remark:Tolerance can be customized as per requests

1.1191 Steel Chemical Composition

Standard	Grade	C	Si	Mn	P	S	Cr
ASTM A29	1045	0.43-0.50	-	0.60-0.90	≤0.04	≤0.05	-
EN 10083-2	C45	0.42-0.50	≤0.04	0.50-0.90	≤0.03	≤0.035	≤0.4
	1.1191
JIS G4051	S45C	0.42-0.48	0.15-0.35	0.60-0.90	≤0.03	≤0.035	-

1.1191 Steel Physical Property

Density, g/cm3	7.87
Melting point °C	1495
Modulus of Elasticity, psi	29 x 10^6
Coefficient of Thermal Expansion, 68-212˚F, /˚F	6.39 x 10^-6
Thermal Conductivity, Btu/ft hr ˚F	30
Specific Heat, Btu/lb ˚F	0.116
Electrical Resistivity, Microhm-in	6.42

1.1191 Steel Mechanical Property

Section Size mm	≤ 16	17 – 40	41 – 100
Tensile Strength Mpa	700-850	6500-800	630-780
Yield Strength Mpa	≥ 500	≥430	≥ 370
Elongation in 50mm %	≥ 14	≥ 16	≥ 17
Impact Charpy J	≥ 30	≥ 30	≥ 30
Hardness HB	210-245	195-235	185-230

Remark:Water Quench at 820 ^oC -850 ^oC or oil quench at 830 °C-860°C and Tempered Between 540 °C – 680 °C

1.1191 Steel Forging

Heat AISI 1045 with two steps,first heat the temperature to 750 ^oC – 800 ^oC ,hold for suitable time,then heat the temperature up to 1100 ^oC – 1200 ^oC,hold enough time for the steel to be thoroughly heated.Minimum forging temperature 850°C,so don’t forge below it.AISI 1045 steel  should be cooled as slowly as possible in still air or in sand after forged.

1.1191 Steel Normalizing

Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged,and considered as a conditioning treatment before final heat treatment.Normalizing temperature for AISI 1045  steel should be carried out between 870℃-920℃. hold suitable time for the steel to be thoroughly heated to  complete the ferrite to austenite transformation.Soak for 10 – 15 minutes,then cool in still air.

1.1191 Steel Annealing

Annealing  is considered as a treatment  suitable for machining.AISI 1045 should be carried our at a nominal temperature of 800℃-850℃,hold suitable time for the steel to be thoroughly heated, then furnace cooling.

1.1191 Steel Hardening

AISI 1045 may be hardened to increase surface hardness and strength.It is usually heated to temperature  820^oC – 860^oC,hold suitable time for the steel to be  heated uniformly,soak for 10 -15 minutes per 25mm of section, and quench in water or oil.Tempering should be followed  immediately after quenched.

1.1191 Steel Tempering

Tempering will be carried out to optimize the property after quench.AISI 1045 steel is usually heated  to 400^oC – 650^oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25mm of section, and cool in still air.

1.1191 Steel Application

Compared with AISI 1020,AISI 1045 has low alloy,but can be flamed or induction hardening to obtain high strength,and is widely used in many industries which require more strength,wear resistance,

Typical applications includes Axles,Bolts, Connecting Rods, Hydraulic Clamps ,Rams, Pins , Rolls, Studs, Shafts, Spindles, Sockets, Light gears etc.