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Alloy Steel Guide

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4140 PH/HT Alloy Steel

4140 heat treated alloy is a chromium-molybdenum, medium carbon alloy steel, and is used in a wide variety of applications requiring high strength and toughness. The chromium imparts good hardness penetration while molybdenum provides hardness uniformity and strength. In the heat treated or prehard conditions it is in the 26-32 Rockwell C range and stress relieved to minimize warping during machining. Localized hardness may also be imparted by flame or induction hardening. Primarily used in press brake dies, 4140 is also a good choice for applications requiring greater toughness than mild steel. Other typical applications include: bolts, molds, stripper plates, slides, ejector plates, jigs, fixtures, punch plates, drill collars, couplings, axle shafts, valves, machinery shafts, reamer bodies, machine stops.

Chemical Composition:

Carbon: 0.38/0.43
Chromium: 0.80/1.00
Molybdenum: 0.15/0.25
Manganese: 0.75/1.00
Silicon: 0.15/0.35
Phosphorus: 0.035 max
Sulfur: 0.040 max
Temp. °F
Normalizing 1600-1700
Annealing 1450-1550
Hardening 1525-1625
Tempering 400-1200
Rockwell C
Mechanical Properties
Tensile Strength 130 ksi
Yield Point 120 ksi
Elongation 2" % 21
Red. Area % 65
Hardness Brinell 245-300
Hardness Rc 24-32
Machinability % na

8620 Alloy Steel

8620 alloy steel is a chromium-molybdenum-nickel "triple alloy". It is a widely used case hardening alloy grade that is used where high surface hardenability and tough core is desired along with easy machinability and excellent wear resistance. The chromium and molybdenum contribute to hardness penetration while the nickel increases the toughness. Typical applications include: gauges, jigs, gears, piston rods, plastic molds, cams, pinions, spline shafts.

Chemical Composition:

Carbon: 0.18/0.23
Nickel: 0.40/0.70
Chromium: 0.40/0.60
Molybdenum: 0.15/0.25
Manganese: 0.70/0.90
Silicon: 0.15/0.35
Phosphorus: 0.035 max
Sulfur: 0.040 max
Temp. °F
Annealing 1550-1600
Carburizing 1650-1700
Tempering 300-450
Mechanical Properties
Tensile Strength 85 ksi
Yield Point 65 ksi
Elongation 2" % 18-25
Red. Area % 55-65
Hardness Brinell 165-200
Hardness Rb 85-93
Machinability % 55

E52100 Alloy Steel

E52100 alloy steel is a bearing quality, high carbon, high chromium alloy. It can attain high hardness with excellent resistance to wear and abrasion and possesses very high compressive strength in smaller sections. Applications include: cam rollers, shear and cutting blades, punches, bearings.

Chemical Composition:

Carbon: 0.95/1.10
Chromium: 1.30/1.60
Manganese: 0.25/0.45
Silicon: 0.15/0.35
Phosphorus: 0.025 max
Sulfur: 0.025 max
Temp. °F
Annealing 1350-1450
Hardening 1500-1600
Tempering 350-450
Mechanical Properties
Tensile Strength 100-120 ksi
Yield Point 80-90 ksi
Elongation 2" % 12-22
Red. Area % 50-60
Hardness Brinell 200-220
Hardness Rb 93-100
Machinability % 40

e.t.d. 150 Alloy Steel

ETD 150 is similar in composition to 4140 alloy. It is produced by the Elevated Temperature Drawing process patented by the La Salle Steel Co. This process results in a bar that is stress-free and a minimum of 32 Rockwell C hardness, eleminating the need for further heat treating methods. When higher hardness is desired, a level of 57-60 Rockwell C is attainable by quenching and tempering. Along with their high strength, these bars have excellent machining characteristics. Uses include: axles, shafts, gears, pinions, fasteners.

Chemical Composition:

Carbon: 0.40 min
Chromium: 0.80/1.20
Molybdenum: 0.15/0.25
Manganese: 0.70/1.10
Silicon: 0.15/0.35
Phosphorus: 0.035 max
Sulfur: 0.060 max
Mechanical Properties
Tensile Strength 150 ksi min
Yield Point 130 ksi min
Elongation 2" % 10-30
Red. Area % 35-45
Hardness Brinell 302 min
Hardness Rc 32 min
Machinability % 75

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