Introduction:
SAE 4137H is an H-Steel gradeAlloy Steel. It is commonly called SAE 4137H Chromium-molybdenum steel.SAE 4137H offers good ductility and shock resisting properties combined with resistance to wear. With these characteristics it is a popular high tensile engineering steel with a tensile of 850-1000Mpa. At low temperatures it has reasonably good impact properties. It is also suitable for a variety of elevated temperature applications. For maximum wear and abrasion resistance the steel can be nitrided to give a shallow depth wear resistant case. Flame or induction hardening of 708M40T can give a case hardness of 50HRc or higher.
Applications:
SAE 4137H is now widely used in areas such as the motor, oil and gas industries. Suitable for components such as shafts, gears, spindles, bolts, studs and a wide variety of applications where a good quality high tensile steel grade is required.
All Grades Comparison
DIN |
BS |
SAE |
ASTM |
JIS |
ANFOR |
UNI |
SS |
1.7225 |
708M40 |
J1268 |
4137H |
SCM4H |
40CD4 |
38CrMo4KB |
2244 |
Chemical Composition(%)
C |
Mn |
Si |
P |
S |
Cr |
Mo |
0.34-0.41 |
0.60-1.00 |
0.15-0.35 |
0.035 max |
0.040 max |
0.75-1.20 |
0.15-0.25 |
Mechanical Properties(T=20°C if not differently stated)
Tensile Strength (Mpa) |
Yield Strength(Mpa) |
Fracture elongation A5 (%) |
Notch impact energy ISO-V [J] |
Hardness (HB) |
850-1000 |
650 min |
13 min |
35 min |
248-302 |
HEAT TREATMENT
Forging:Preheat SAE 4137H carefully, then raise temperature to 850-1200°C for forging. Do not forge below 850°C. After forging SAE 4137H, cool slowly in still air.
Annealing:Heat SAE 4137H slowly to 680-700°C. Cool in air.
Hardening:SAE 4137H is commonly supplied ready heat treated. If further heat treatment is required annealed SAE 4137H should be heated slowly to 860-890°C and after adequate soaking at this temperature quench in oil. Temper as soon as tools reach room temperature.