36CrNiMo4 steel  also known as  1.6511 steel, is an alloy structural steel that belongs to the standard EN 10250-3. It equivalent ASTM 4340 which commonly used in gears, shafts, piston parts,and aircraft, and various wear-resistant parts.

36CrNiMo4 Steels And Equilvalents Chemical Composition 

Standard Grade C Mn P S Si Ni Cr Mo
ASTM A29 4340 0.38-0.43 0.60-0.80 0.035 0.040 0.15-0.35 1.65-2.00 0.70-0.90 0.20-0.30
EN 10250 36CrNiMo4/
1.6511		 0.32-0.40 0.50-0.80 0.035 0.035 ≦0.40 0.90-1.20 0.90-1.2 0.15-0.30
BS 970 EN24/817M40 0.36-0.44 0.45-0.70 0.035 0.040 0.1-0.40 1.3-1.7 1.00-1.40 0.20-0.35
JIS G4103 SNCM 439/SNCM8 0.36-0.43 0.60-0.90 0.030 0.030 0.15-0.35 1.60-2.00 0.60-1.00 0.15-0.30

 Steel Mechanical Properties of 36CrNiMo4 Steels

The mechanical properties of 36CrNiMo4 steel are influenced by its composition and heat treatment. Here are typical mechanical properties for 36CrNiMo4:

  1. Tensile Strength (Rm): 980 – 1180 MPa
  2. Yield Strength (Rp0.2): 785 MPa (min)
  3. Elongation at Break (A): 11% (min)
  4. Impact Toughness (KV):
    • Charpy V-notch impact toughness values are typically specified.
    • Example: 27 J (at -20°C)
  5. Hardness:28-34 HRC (Rockwell C).

These mechanical properties make 36CrNiMo4 suitable for applications where require high strength, toughness, and resistance to fatigue and impact .

36CrNiMo4 round barPhysical Properties of 36CrNiMo4 Steels

  1. Density: 7.85 g/cm³ (0.284 lb/in³). This value represents the mass per unit volume of the material.
  2. Melting Point: Around 1420-1470°C (2590-2678°F).

Heat treatment of 36CrNiMo4 Steel

  1. Annealing:
    • Heated to a temperature between 850°C and 880°C (1562°F to 1616°F).
    • Held at that temperature for a sufficient duration after reaching the specified temperature.
    • Slow cooling in the furnace  then performed to relieve internal stresses and improve machinability.
  2. Normalizing:
    • Normalizing involves heating the steel to a temperature above the critical range (about 850°C to 890°C or 1562°F to 1634°F) and then allowing it to cool in air.
  3. Quenching:
    • Heated to a temperature typically between 850°C and 880°C (1562°F to 1616°F) and then quickly cooled by  oil or water.
  4. Tempering:
    • After quenching, the steel reheate to a temperature between 550°C and 650°C (1022°F to 1202°F).
    • Tempering helps to relieve internal stresses induced during quenching and reduces the brittleness of the material.

36CrNiMo4 steel application36CrNiMo4 round bar

36CrNiMo4 steel  commonly use  for  various industrial applications where high strength, toughness, and fatigue resistance are essential. Here are some typical applications of 36CrNiMo4 steel:

  1. Gears and Shafts:
    • Due to its excellent combination of strength and toughness, 36CrNiMo4 is frequently used for manufacturing gears and shafts in heavy-duty machinery and mechanical power transmission systems.
  2. Aerospace Parts:
    • In the aerospace industry, especially in the production of aircraft parts, 36CrNiMo4 is adopted for its high tensile strength and fatigue resistance, making it suitable for critical parts subjected to dynamic loads.
  3. Automotive Parts:
    • The steel is utilized in the automotive sector for manufacturing components such as crankshafts, connecting rods, and gears. Its ability to withstand high stress and fatigue makes it valuable in these applications.
  4. Heavy-Duty Crankshafts:
    • 36CrNiMo4 commonly use  for the production of heavy-duty crankshafts for engines. Its high strength and toughness are beneficial for withstanding the dynamic loads experienced by crankshafts.
  5. Oil and Gas Industry:
    • Components in the oil and gas industry, such as drill collars, gears, and other parts subjected to demanding conditions, may be made from 36CrNiMo4 due to its mechanical properties.
  6. Mining Equipment:
    • The steel is suitable for components used in mining equipment, where durability and resistance to wear and impact are crucial.
  7. Construction Machinery:
    • Various components in construction machinery, including gears, shafts, and structural parts, may be manufactured from 36CrNiMo4 to ensure reliability and performance.
  8. Railway Industry:
    • Some railway components, like axles and gears in heavy-duty rail applications, may utilize 36CrNiMo4 for its strength and resistance to wear and fatigue.

In Conclusion

36CrNiMo4 is a chromium-molybdenum alloy steel known for its high strength and toughness. It falls under the category of engineering steels and applicate in  where require high tensile strength, fatigue resistance, and good hardenability.

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Pls contact : JoannJoann -Otai specai steel

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