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1.7225 (42CrMo4) Quenched Steel
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1.7225 QT (42CrMo4) Quenched Steel

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Description

1.7225 QT (42CrMo4) is a quenched and tempered variation of 1.7225 (42CrMo4) steel. It is a low-alloy steel that contains chromium and molybdenum as its main alloying elements, which contribute to its high strength, toughness, and wear resistance.

The quenching and tempering process involves heating the steel to a high temperature and then rapidly cooling it in a liquid, such as oil or water, to achieve a hardened structure. The steel is then tempered at a lower temperature to improve its ductility and toughness, while still retaining its high strength.

1.7225 QT (42CrMo4) is commonly used in applications that require high strength and good wear resistance, such as heavy-duty machinery parts, crankshafts, and gears. It is also used in applications that require good toughness and ductility, such as shafts and axles.

Application Areas

Application Areas

1.7225 QT (42CrMo4) quenched and tempered steel is commonly used in a variety of high-stress applications that require good strength, toughness, and wear resistance. Some of its common application areas include:

  1. Heavy-duty machinery parts, such as gear wheels, crankshafts, and connecting rods
  2. Automotive and aircraft parts, such as axles, steering components, and suspension parts
  3. Oil and gas industry equipment, such as drill collars, drilling tools, and mud motors
  4. Construction and mining equipment, such as excavator components and earthmoving machinery parts
  5. Tooling and die-making applications, such as forging dies and molds for plastics and metals
  6. Power generation equipment, such as turbine blades, generator rotors, and shafts.

These are just some examples of the many applications where 1.7225 QT (42CrMo4) steel can be used. The specific application areas depend on the requirements for strength, toughness, and wear resistance of the component being manufactured.

Technical Details

Technical Details

CHEMICAL COMPOSITION

Element Content (% by mass)
Carbon (C) 0.38 – 0.45
Silicon (Si) 0.40 max
Manganese (Mn) 0.60 – 0.90
Phosphorus (P) 0.025 max
Sulfur (S) 0.035 max
Chromium (Cr) 0.90 – 1.20
Molybdenum (Mo) 0.15 – 0.30

Note that this is just a general range, and the exact composition may vary depending on the manufacturing process and the specific standards or specifications being followed.

HEAT TREATMENT

Here is a table summarizing a typical heat treatment process for 1.7225 QT (42CrMo4) quenched and tempered steel:

Heat Treatment Process Temperature (°C) Cooling Medium Purpose
Annealing 800-850 Furnace Relieve internal stresses and improve machinability
Normalizing 870-920 Air Refine grain structure and improve machinability
Quenching 850-880 Oil or water Harden the steel and increase strength
Tempering 560-600 Air Reduce hardness and increase toughness

It is important to note that the specific heat treatment process and parameters may vary depending on the desired properties and application of the steel.

MECHANICAL PROPERTIES

Property Value Unit
Tensile strength 800 – 1200 MPa
Yield strength 650 – 900 MPa
Elongation 10 – 20 %
Reduction of area 35 – 55 %
Impact strength 50 – 100 J

Note that the actual mechanical properties of the steel may vary depending on the specific manufacturing process and heat treatment parameters used, as well as any additional processing or finishing steps. These values are meant to be a general guide and may not necessarily reflect the exact properties of a particular batch or sample of steel.

PHYSICAL PROPERTIES 

Property Value Unit
Density 7.85 g/cm³
Thermal conductivity 42 W/(m*K)
Specific heat capacity 460 J/(kg*K)
Coefficient of thermal expansion 10.8 1/K
Elastic modulus 190 – 210 GPa

Note that the actual physical properties of the steel may vary depending on the specific manufacturing process and heat treatment parameters used, as well as any additional processing or finishing steps. These values are meant to be a general guide and may not necessarily reflect the exact properties of a particular batch or sample of steel.