Designation by Standards
Chemical Composition (in weight %)
1.6582 is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength. A very popular, versatile steel. It can be heat-treated to produce a wide range of tensile strength in moderate sections.
Typical applications are for structural use, such as aircraft landing gear, power transmission gears and shafts and other structural parts, general engineering parts, hrough-hardened gears, connecting rods and bolts, gun barrels.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.84
Thermal conductivity [W/m.K]: 37.7
Specific heat capacity[J/g.K]: 0.46
Flammability: very good
Fresh water: good
Organic solvent: very good
Oxidation at 500oC: good
Sea water: average
Strong acid: poor
Strong alkalis: poor
Wear: very good
Weak acid: average
Weak alkalis: good
Minimum service temperature: -73.2 to -42.2oC
Maximum service temperature: 613-653oC
Normalizing temperature: 850-880oC.
Stress relieving to remove machining stresses should be carried out by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Harden from a temperature of 830-860oC followed by oil quenching. Qenching temperature in the end-quench test is 850oC.
Tempering temperature: 540-660oC.
Mechanical Properties in Quenched and Tempered Condition
|Diameter (mm)||0.2 % proof stress (N/mm2)||Tensile strength (N/mm2)||Elongation (%)||Reduction of area (%)||Notch impact energy (ISO-V) (J)|
|up to 16||980||1180-1380||9||40||41|
Distance From Quenched End in mm
Hot forming temperature: 1100-900oC.
Machining is best done with this alloy in the annealed or normalized and tempered condition. It can be machined by all conventional methods.
This is a low alloy steel and not a corrosion resistant alloy. Protective coating should be used.
The alloy can be fusion or resistance welded. Preheat and post heat weld procedures should be followed when welding this alloy by established methods.
The VCNMO150 alloy may be cold worked, in the annealed condition, by conventional methods and tooling. It has good ductility.
All technical information is for reference only.