Introduction
DIN 1.4112 (X4Cr12MoV) is an alloy tool steel used for a variety of tooling applications. It is primarily used for engineering and machine parts, as well as for forming dies. The designation DIN 1.4112 indicates that this steel is an alloy steel, composed of a specific mix of elements, and is produced to rigorous German standards (DIN).
AISI 431 (X6Cr17NiMoV) is a martensitic stainless steel alloy often used for applications requiring high strength and corrosion resistance. This grade is often used for pump and valve components, as well as for fasteners, in a range of industries. AISI 431 is composed of a unique mixture of elements, and manufactured to specific American Iron and Steel Institute standards (AISI).
Composition
Defining composition of a steel can be a complex process, as steels are composed of a large variety of elements, depending on the alloy type. For both proven alloys, the elemental composition can be broken down in detail as follows:
DIN 1.4112 (X4Cr12MoV):
C: 0.35 - 0.45%
Si: 0.30 - 0.60%
Mn: 0.50 - 0.80%
Cr: 11.00 - 13.00%
Mo: 0.60 - 0.90%
V: 0.30 - 0.50%
AISI 431 (X6Cr17NiMoV):
C: 0.17 - 0.23%
Si: 0.50 - 1.00%
Mn: 1.00 - 1.50%
Cr: 16.00 - 18.00%
Ni: 1.00 - 2.50%
Mo: 0.60 - 0.90%
V: 0.15 - 0.30%
Mechanical Properties
For many applications, the mechanical properties of a material are often the primary factor when selecting an alloy. The mechanical properties of these two steels can be broken down as follows:
DIN 1.4112 (X4Cr12MoV):
Tensile Strength: 600 MPa (87,000 psi)
Yield Strength: 400 MPa (58,000 psi)
Elongation: 10 - 20%
Impact Strength: 15 J/cm2 (-20°C, 27.6 ft-lb/in²)
Hardness: 38 - 55 HRC
AISI 431 (X6Cr17NiMoV):
Tensile Strength: 660 MPa (96,000 psi)
Yield Strength: 400 MPa (58,000 psi)
Elongation: 20 - 15%
Impact Strength: 10- 15 J/cm2 (-20°C, 14.5 - 22 ft-lb/in²)
Hardness: 40 - 50 HRC
Applications
The wide range of mechanical properties make both of these grades suitable for a variety of applications. DIN 1.4112 (X4Cr12MoV) is often used for engineering and machine parts that require strength, hardness and good wear resistance. It is also used for forming dies and punches.
AISI 431 (X6Cr17NiMoV) is often used for pump and valve components, as well as for fasteners that require high strength and corrosion resistance. Other typical applications include automotive trim, aircraft engine components and medical implants.
Conclusion
In summary, DIN 1.4112 (X4Cr12MoV) and AISI 431 (X6Cr17NiMoV) are alloys with distinct compositions and mechanical properties. Both can be used for a variety of applications and both offer high strength and hardness, as well as good wear and corrosion resistance. While both are alloys, they have a number of differences, such as elemental composition and physical properties that make them suitable for different applications. It is important to select the right alloy to ensure a quality finished product.
