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35NCD16 DIN1.6773 36NiCrMo16 QT Steel

35NCD16 DIN1.6773 36NiCrMo16 QT Steel 36nicrmo16 35NCD16 DIN1.6773 36NiCrMo16 QT Steel 35NCD16 DIN1

35NCD16 DIN1.6773 36NiCrMo16 QT Steel

Description and Application

Quench and tempering special NiCrMo 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)

All Grades Comparison

DIN EN ANFOR
1.6773 36NiCrMo16 35NCD16

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

Chemical Composition(%)

C Mn Si P S Cr Ni Mo
0.32-0.39 0.50-0.80 0.40 max 0.025 max 0.025 max 1.60-2.00 3.60-4.10 0.25-0.45

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

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:
  • Forging:

    Hot forming temperature: 1050-850oC.

    Mill′s test certificate:

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