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DIN1.6510 39NiCrMo3 36CrNiMo4 AISI9840 Quenched and Tempered Steel

Description and Application

This steel is suitable for different heat treatment and shows a good cold workability.

Application

This steel is suited to production of highly stressed components of large cross section for aircraft, automotive and general engineering applications, such as forged propeller shafts, connecting rods, gear shafts, crankshafts and landing gear components.

All Grades Comparison

DIN EN ANFOR AISI GOST
1.6510 39NiCrMo3 40NCD3 9840 39HNM

Quality Standard

EN 10083 Steels for quenching and tempering. Technical delivery conditions for alloy steels
ASTM A29 Standard Specification Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements

Chemical Composition(%)

C Mn Si P S Cr Ni Mo
0.35-0.43 0.50-0.80 0.40 max 0.025 max 0.035 max 0.80-1.10 0.70-1.00 0.15-0.25

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)
Hot Rolled+Quenched+Tempered 0-16 980-1180 785 min 11 min 40 min / 295-354
Hot Rolled+Quenched+Tempered 16-40 930-1130 735 min 11 min 40 min 35 min 278-339
Hot Rolled+Quenched+Tempered 40-100 880-1080 735 min 12 min 45 min 40 min 263-327
Hot Rolled+Quenched+Tempered 100-160 830-980 635 min 12 min 50 min 40 min 249-295
Hot Rolled+Quenched+Tempered 160-250 740-880 540 min 13 min 50 min 40 min 224-263
Hot Forged+Quenched+Tempered 250-500 655-805 490 min 15 min / 30 min 201-241
Hot Forged+Quenched+Tempered 500-1000 635-785 440 min 16 min / 25 min 195-234 Hot Forged+Quenched+Tempered 1000 min 590-740 390 min 15 min / 25 min 176-224

HEAT TREATMENT:

  • Annealing: Austenitize at 1525ºF (830ºC) and slow cool from 1280 to 1200ºF (iso anneal) to give coarse pearlite structure for optimum machinability.
  • Normalizing: At 1600ºF (870ºC) followed by air cool.
  • Hardening: from 1525-1575ºF (830-860ºC) and oil quench for thin, intricate shapes, water quench for large, simple shapes.
  • Tempering: from 1000-1250ºF(540-680ºC) as per required properties.
  • Machinability:

    this alloy may be readily machined, preferably from a coarse pearlitic structure.

    Weldability:

    pre-heat and post-weld stress relief are recommended for welding of this alloy. Welding should not be carried out in the hardened and tempered condition.

    Mill′s test certificate:

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