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 | 25-42 |
| 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 |
|
| Normalizing | 1650-1750 |
| 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 |
|
| Normalizing | no |
| 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 |
Speed. That's KEY.