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AISI-9840-Steel-bar-630x320

39NiCrMo3 / 1.6510 Steel

39NiCrMo3 / 1.6510 Steel is a nickel-chrome-molybdenum steel which contains at least 0.85%Ni,0.7%Cr,0.2%Mo as strengthening alloy elements.It is suitable for different heat treatment and shows excellent hardenability, strength,toughness and good cold workability.After annealing,this material  becomes machinable and adjusted for the mechanical cutting.pre-heat and post-weld stress relief are necessary for welding of this alloy,but welding in the hardened and tempered condition is not recommended.

39NiCrMo3 / 1.6510 Steel Supply Form & Size

Form of Supply Size(mm) Length(mm)
Round bar Φ6-Φ1,000 3,000-10,000
Square bar 100×100-600×600 3,000-6,000
Plate/Sheet Thickness :20-400
Width:80-1,000
2,000-6,000
Flat bar/Blcoks Thickness :120-800
Width:120-1,500
2,000-6,000

39NiCrMo3 / 1.6510 Steel Surface Finish&Tolerance

Surface Finish Black-Forged Black-Rolled Turned Grinding Polished Peeled Cold Drawn
Tolerance (0,+5mm) (0,+1mm) (0,+3mm) Best h9 Best h11 Best H11 Best H11

39NiCrMo3 / 1.6510 Steel Chemical Composition per EN 10083-3

GRADE NUMBER C Si Mn P S Cr Mo Ni
39NiCrMo3 1.6510 0.35-0.43 ≤ 0.40 0.50-0.80 ≤ 0.025 ≤ 0.035 0.60-1.00 0.15-0.25 0.70-1.00
Germany Russia Italy France
36CrNiMo4/1.6511 36HNM 39NiCrMo3 40NCD3

39NiCrMo3 / 1.6510 Steel Mechanical Property

Diameter d mm ≤ 16 16-40 40-100 100-160 160-250
Yield Strength Mpa ≥900 ≥800 ≥700 ≥600 ≥550
Tensile Strength Mpa 1100-1300 1000-1200 900-1100 800-950 750-900
Elongation, % ≥10 ≥11 ≥12 ≥13 ≥14
Reduction of area ,% ≥45 ≥50 ≥55 ≥60 ≥60
impact,J ≥35 ≥40 ≥45 ≥45 ≥45
Hardness,HB 331-380 298-359 271-331 240-286 225-271

39NiCrMo3 / 1.6510 Steel Forging

Forging AISI 9840 steel between 1100℃-11500℃,and reheat the steel once temperature below 950℃.AISI 9840 has good forging characteristics,but this material is easy to crack when cooling improperly,Cooling in sand or in the furnace after forging is recommended.

39NiCrMo3 / 1.6510 Steel Heat Treatment

  • Normalizing:850℃-880℃,Cool in air
  • Soft Annealing:650℃-700℃,Cool in furnace
  • Full Annealing:830℃-850℃,Cool in furnace,235HB max
  • Hardening:830℃-865℃,water or oil quench
  • Tempering:540°C – 680°C, cool in still air

39NiCrMo3 / 1.6510 Steel Machinability

This material may be readily machined, preferably from a coarse pearlitic structure.

39NiCrMo3 / 1.6510 Steel Application

This alloy is suitable for 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.

 

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