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Forged Nozzle

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SAE 4137H Quenched and Tempered Steel Nozzles

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Product Information

SAE 4137H Quenched and Tempered Steel Nozzles

Introduction:
SAE 4137H is an H-Steel grade Alloy 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°-1000N/mm². 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.
Tempering: Heat the component carefully to a suitable temperature selected by reference to a tempering chart or table, soak at the temperature for two hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.

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