what is 42CrMo4 material

42CrMo4 alloy steel is widely utilized in numerous industrial contexts due to its remarkable strength, durability, and wear resistance. It is commonly utilized in engineering components and machinery where high strength and good mechanical properties are required.

Breakdown of 42CrMo4

42: The percentage of carbon in the steel.

Cr: The percentage of chromium in the steel.

Mo: The percentage of molybdenum in the steel.

4: The temper designation, which indicates the heat treatment that the steel has undergone.

42CrMo4 chemical composition 

42CrMo4 is a low alloy steel that is commonly used in engineering applications. It is known for its high strength, toughness, and fatigue resistance.

The chemical composition of 42CrMo4 is as follows:

• Carbon: 0.42%

• Chromium: 1.00%

• Manganese: 0.80%

• Molybdenum: 0.25%

• Sulfur: 0.03%

• Phosphorus: 0.04%

Effects of each element in the material composition of 42CrMo4 steel

• Carbon: Increases the steel’s strength and hardness.

• Chromium: Increases the steel’s hardenability and corrosion resistance.

• Molybdenum: Further improves the steel’s hardenability and toughness.

• Manganese: Improves the steel’s machinability and toughness.

• Sulfur: Weakens the steel and can cause brittleness.

• Phosphorus: Weakens the steel and can cause brittleness.

What is the 42CrMo4 mechanical properties

The mechanical properties of 42CrMo4 steel depend on the heat treatment process. In the quenched and tempered condition, 42CrMo4 has the following mechanical properties:

• Tensile strength: 1000 MPa
• Yield strength: 800 MPa
• Hardness: 29-34 HRC
• Elongation: 14%
• Reduction of area: 550%

Tensile strength is the most force an object can take before it breaks. The yield strength is the stress at which a material begins to deform plastically. The hardness is a measure of the resistance of a material to indentation. The elongation is the percentage of length that a material can stretch before it breaks. The reduction of area is the percentage of cross-sectional area that a material loses when it is stretched to its breaking point.

Applications of 42CrMo4 material

• Gears

• Crankshafts

• Connecting rods

• Shafts

• Bearings

• Springs

• Tools

• Drill bits

• Mining machinery

• Construction equipment

42CrMo4 is a versatile and effective steel that can be used in many different ways. It is important to note that 42CrMo4 is difficult to weld, so special techniques must be used.

42CrMoS4 is a similar steel that contains sulfur instead of molybdenum. Sulfur has a negative effect on the toughness of steel, but it also improves the machinability. 42CrMoS4 is often used in applications where high machinability is required, such as in the automotive industry.

EN19 is a European standard for 42CrMo4 steel. It is equivalent to the American standard AISI 4140.

42crmo4 equivalent material

AISI 4140

The full form of AISI 4140 is “American Iron and Steel Institute 4140”. It is a type of alloy steel that is commonly used in engineering applications. It is known for its high strength, toughness, and fatigue resistance.

American Iron and Steel Institute is what AISI stands for. It is a group of businesses in the United States that work with steel. The 4140 is the number that identifies the specific alloy composition of the steel.

The chemical composition of AISI 4140 is as follows

• Carbon: 0.40-0.45%
• Chromium: 0.95-1.10%
• Manganese: 0.75-0.90%
• Molybdenum: 0.25-0.30%
• Sulfur: 0.040%
• Phosphorus: 0.040%

The carbon content in AISI 4140 gives it its strength and hardness. The chromium content improves the steel’s hardenability and corrosion resistance. The molybdenum content further improves the steel’s hardenability and toughness.

The mechanical properties of AISI 4140 depend on the heat treatment process. AISI 4140 has tensile strength of 980–1050 MPa, yield strength of 780–850 MPa, and hardness of 29–34 HRC when it is quenched and tempered. 

AISI 4140 is a machinable steel, but it can be difficult to weld. It is typically used in applications where high strength, toughness, and wear resistance are required.

JIS SCM440H

The full form of JIS SCM440H is Japanese Industrial Standard SCM440H. It is a Japanese standard for a medium-carbon, chromium-molybdenum alloy steel. It is equivalent to the American standard AISI 4140 and the German standard DIN 1.7225.

The JIS stands for Japanese Industrial Standard. It is a national standard for Japan that is developed and maintained by the Japanese Standards Association. The SCM440H is the number that identifies the specific alloy composition of the steel.

The chemical composition of JIS SCM440H is as follows:

• Carbon: 0.42%
• Chromium: 1.00%
• Manganese: 0.80%
• Molybdenum: 0.25%
• Sulfur: 0.03%
• Phosphorus: 0.04%

The carbon content in JIS SCM440H gives it its strength and hardness. The chromium content improves the steel’s hardenability and corrosion resistance. The molybdenum content further improves the steel’s hardenability and toughness.

The mechanical properties of JIS SCM440H depend on the heat treatment process. In the quenched and tempered condition, Tensile strength (1000 MPa), yield strength (800 MPa), and hardness (29–34 HRC) are the characteristics of JIS SCM440H.

JIS SCM440H is a machinable steel, but it can be difficult to weld. It is typically used in applications where high strength, toughness, and wear resistance are required.

DIN 1.7225

DIN 1.7225 is a German standard for a medium-carbon, chromium-molybdenum alloy steel. It is equivalent to the American standard AISI 4140 and the Japanese standard JIS SCM440H.

DIN stands the German Institute for Standardization. The 1.7225 is the number that identifies the specific alloy composition of the steel.

The chemical composition of DIN 1.7225 is as follows:

• Carbon: 0.42%
• Chromium: 1.00%
• Manganese: 0.80%
• Molybdenum: 0.25%
• Sulfur: 0.03%
• Phosphorus: 0.04%

The carbon content in DIN 1.7225 gives it its strength and hardness. The chromium content improves the steel’s hardenability and corrosion resistance. The molybdenum content further improves the steel’s hardenability and toughness.

The mechanical properties of DIN 1.7225 depend on the heat treatment process. In the quenched and tempered condition, The tensile strength, yield strength, and hardness of DIN 1.7225 are 1000 MPa, 800 MPa, and 29–34 HRC, respectively.

GB 42CrMo

GB 42CrMo is a Chinese standard for a medium-carbon, chromium-molybdenum alloy steel. It is equivalent to the American standard AISI 4140 and the Japanese standard JIS SCM440H.

The GB stands for Guobiao, which is the Chinese national standard. The 42CrMo is the number that identifies the specific alloy composition of the steel.

The chemical composition of GB 42CrMo is as follows:

• Carbon: 0.42%
• Chromium: 1.00%
• Manganese: 0.80%
• Molybdenum: 0.25%
• Sulfur: 0.03%
• Phosphorus: 0.04%

The carbon content in GB 42CrMo gives it its strength and hardness. The chromium content improves the steel’s hardenability and corrosion resistance. The molybdenum content further improves the steel’s hardenability and toughness.

The mechanical properties of GB 42CrMo depend on the heat treatment process. In the quenched and tempered condition, GB 42CrMo exhibits a hardness of 29–34 HRC, a yield strength of 800 MPa, and a tensile strength of 1000 MPa.

EN19

EN19 is a British standard for alloy steels, specifically for engineering applications. It is also known as 708M40 in the UK and AISI 4140 in the United States. EN19 is part of the BS EN standards series, which are European standards developed by the European Committee for Standardization (CEN) to define various steel grades and their properties for specific applications.

EN19/708M40/AISI 4140 is a widely used alloy steel known for its high strength, toughness, and versatile properties. It is commonly used in applications where a combination of excellent mechanical properties, wear resistance, and toughness is required. EN19 is often employed for components like shafts, gears, axles, bolts, and other engineering components subject to high loads and stress.

Here are some of the typical properties of EN19 steel:

• Tensile Strength: Typically ranges from 850 MPa to 1000 MPa.
• Yield Strength: Generally around 650 MPa to 850 MPa.
• Elongation: Typically around 12% to 20%.
• Hardness: After proper heat treatment, the hardness usually falls within
  the range of 28 HRC to 36 HRC (Rockwell C).
• Impact Toughness: Because EN19 has strong impact toughness, it can be
  used in situations where resistance to shocks or rapid impacts is required.
• Machinability: It can be machined, but due to its alloying elements,
  it’s not as easily machinable as some lower-alloy steels.

EN19 is typically supplied in the quenched and tempered condition, which involves heating the steel to a high temperature, followed by quenching in oil or water to achieve the desired hardness. It is then tempered to attain the right balance of strength and toughness.

As with any material, when using EN19, it’s crucial to follow the recommended heat treatment procedures and standards to achieve the desired mechanical properties and performance for your specific application.

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