36NiCrMo16 / 1.6773 Steel

36NiCrMo16 / 1.6773 Steel Description and Application

36NiCrMo16 / 1.6773 Steel, almost equivalent to 34NiCrMo16 steel standardized according to UNI7874/7845, characterized by very high tensile strength together with good toughness. It is usable in the hardened and stress relieved state. It can harden in the air up to thicknesses equal to 90 mm. It is suitable to the manufacture of components of maximum thickness equal to 300 mm strongly stressed and even with a complicated geometry (shafts, torsion shafts, axles, levers, connecting rods, rocker arms). To improve the workability at the machines tools it can be booked with the addition of Ca or re-sulphurized (S60,1%).

The use of re-sulphurized steels involves a worsening of the tensile strength characteristics along the transversal, of the impact strength and of the fatigue strength. Advised austenitic grain dimension > 5 according to UNI 3245 (similar to ASTM E 112-82)

36NiCrMo16 / 1.6773 Steel Grades Comparison

DIN	EN	ANFOR
1.6773	36NiCrMo16	35NCD16

36NiCrMo16 / 1.6773 Steel Quality Standard

EN 10083 Steels for quenching and tempering. Technical delivery conditions for alloy steels
EN 10250 Open steel die forgings for general engineering purposes. Alloy special steels

36NiCrMo16 / 1.6773 Steel Chemical Composition per EN 10083-3

GRADE	NUMBER	C	Si	Mn	P	S	Cr	Mo	Ni
36NiCrMo16	1.6773	0.32-0.39	≤ 0.40	0.50-0.80	≤ 0.025	≤ 0.025	1.60-2.00	0.25-0.45	3.60-4.10

36NiCrMo16 / 1.6773 Steel Mechanical Properties(T=20°C if not differently stated)

Process	Diameter(mm)	Tensile Strength Rm (Mpa)	Yield Strength Rp0.2 (Mpa)	Elongation A5 (%)	Area Reduction Ratio C (%)	Impact Value Kv (J) Room Temperature	Hardness (HB)
SOFT ANNEALED	/	912 max	/	/	/	/	269 max
QUENCHED AND TEMPERED	16 max	1250-1450	1050 min	9 min	40 min	/	368-424
QUENCHED AND TEMPERED	16-40	1250-1450	1050 min	9 min	40 min	30 min	368-424
QUENCHED AND TEMPERED	40-100	1100-1300	900 min	10 min	45 min	35 min	324-382
QUENCHED AND TEMPERED	100-160	1000-1200	800 min	11 min	50 min	45 min	295-353
QUENCHED AND TEMPERED	160-250	1000-1200	800 min	11 min	50 min	45 min	295-353

36NiCrMo16 / 1.6773 Steel HEAT TREATMENT:

• Soft Annealing: Heat to 650-680oC, cool slowly. This will produce a maximum Brinell hardness of 269.
• Normalizing:Temperature: 850-880oC.
• Hardening:Harden from a temperature of 835-865oC, 855-885oC followed by oil or quenching.
• Tempering: 550 – 650℃

36NiCrMo16 / 1.6773 Steel Forging:

Hot forming temperature: 1050-850oC.

36NiCrMo16 / 1.6773 Steel Mill′s test certificate:

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.