Chemical composition and mechanical properties of 4Cr5MoSiV1

4Cr5MoSiV1 chemical composition and mechanical properties, main uses

4Cr5MoSiV1
Overview 4Cr5MoSiV1
The alloy tool steel is referred to as the joint steel, which is a steel type formed by adding alloying elements to the carbon steel. Among them, the joint steel includes: measuring tool steel, impact resistant tool steel, cold work die steel, hot work die steel, non-magnetic die steel, plastic die steel.
4Cr5MoSiV1 is a hot work die steel.
Implementation of the standard GB/T1299-2000.
Uniform digital code A20502;
Grade 4Cr5MoSiV1;
Chemical composition 4Cr5MoSiV1 chemical composition%:
Carbon C: 0.32 to 0.45
Silicon Si: 0.80 to 1.20
Manganese Mn: 0.20 to 0.50
Sulfur S: ≤0.030
Phosphorus P: ≤0.030
Chromium Cr: 4.75~5.50
Nickel Ni: Allowable residual content ≤ 0.25
Copper Cu: Allowable residual content ≤ 0.30
Vanadium V: 0.80~1.20
Molybdenum Mo: 1.10~1.75[1]
Performance ● Physical properties:
Its density is 7.8 t/m3; the elastic modulus E is 210,000 MPa.
Critical temperature critical point temperature (approximate) / °C of 4Cr5MoSiV1 steel
Ac1 860
Ac3 915
Ar1 775
Ar3 815
Ms 340
Mf 215
Line (expansion) expansion coefficient of 4Cr5MoSiV1 steel / °C line (expansion) expansion coefficient / °C-1
20～100 9.1×10-6
20～200 10.3×10-6
20～300 11.5×10-6
20～400 12.2×10-6
20～500 12.8×10-6
20～600 13.2×10-6
20～700 13.5×10-6
Thermal conductivity temperature / °C of 4Cr5MoSiV1 steel Thermal conductivity λ/W•(m•K)-1
25 32.2
650 28.8
●Mechanical properties:
Hardness: Annealing ≤ 235HB, indentation diameter ≥ 3.95mm
Heat treatment process heat treatment: (delivery status: Brinell hardness HBW10/3000 (less than or equal to 235)), quenching: 790 degrees + -15 degrees preheating, 1000 degrees (salt bath) or 1010 degrees (furnace controlled atmosphere) +-6 Degree heating, heat preservation 5~15min air cooling, 550 degree + -6 degree tempering; annealing, hot processing;
Characteristics and use: It is the introduction of H13 air-hardening hot work die steel in the United States. The performance and application are basically the same as those of 4Cr5MoSiV steel, but because of its high vanadium content, the medium temperature (600 degree) performance is better than that of 4Cr5MoSiV steel. It is a representative steel grade widely used in hot work die steel.
Delivery status: The steel is delivered in an annealed condition.

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Optical Coatings

  • Single + Dual Wavelength AR Coatings (VAR / DAR):A single wavelength V-coat will provide reflectance less than 0.25% for 0° incidenceor 0.5% for 45° incidence at the chosen wavelength. Dual wavelength coatings will approach the performance of V-coats for two selected wavelengths. They are useful for optics which must transmit a visible alignment laser as well as a UV or near IR process beam. It is also useful for transmission of fundamental and first harmonic wavelengths.
  • Broadband-AR-coatings:Anti-reflection coatings are offered to reduce surface reflections to a minimum. Two types of broadband coating are offered. A single layer of MgF2 on Fused Silica or BK7 reduces reflections per surface to about 1.5% over a broad bandwidth. If lower reflectance is required a multilayer broadband coating will provide an average reflectance less than 0.5% per surface.

  • Protected + Enhanced Metallic Coatings (PAL / EAL / PAG / EAG / PAU / EAU)

    Metallic coatings make very broad bandwidth reflectors. Usually it is best to protect the coatings with a durable dielectric layer as they are very soft and susceptible to scratching. The efficiency of metallic reflectors falls off at shorter wavelengths but this may be enhanced by the application of a multi-layer dielectric thin film stack. The table shows the reflectance of each of the metals without any protection or enhancement. Protected metallic coatings have a dielectric coating layer over the metallic layer to protect the coating from being oxidized in the air or from scratched. For enhanced metallic coatings, a stack of dielectric layers are added on the metallic coating to increase reflectance for a particular wavelength range.
  • Dielectric High Reflective Coatings:

  1. Broadband HR coatings provide an average reflectance of 99% over a broad range of wavelengths. These broadband mirrors may be used for white light or multi-spectral applications.
  2. Single wavelength, high power HR coatings are suitable for intra and extra cavity use. They provide the ultimate high reflectance of Rs > 99.8% and Rp > 99% for a specific wavelength. They may be used as a rear cavity reflector or for extra cavity use in beam delivery or turning. Note that Lambda high quality visible laser cavity coatings are designed for low scattering.

  • Dichroic Beamsplitters – Beam Combiners – Harmonic Separators (SPD / LPD / BC / HHS)

  1. Separate or combine beams with different wavelengths:Separate or combine beams with different wavelengths. These dichroic coatings allow one wavelength region to be transmitted while they reflect another region. They may be used as illustrated to separate or combine different wavelengths. This can be useful when working with alignment lasers or frequency doublers.
  2. Dichoric Beamsplitters:These long-pass and short-pass coatings may be applied to any optical component to separate or combine different wavelength regions. They are available for normal and 45° angle of incidence. These coatings are highly effective for the wavelength of interest, reflecting over 99%. While they transmit over 85% of other nearby wavelengths, they are not blocked over a broad spectral range.

  • Highly Transmissive AR Coatings For FLIR Applications:

Metallic coatings make very broad bandwidth reflectors. Usually it is best to protect the coatings with a durable dielectric layer as they are very soft and susceptible to scratching. The efficiency of metallic reflectors falls off at shorter wavelengths but this may be enhanced by the application of a multi-layer dielectric thin film stack. The table shows the reflectance. of each of the metals without any protection or enhancement. Protected metallic coatings have a dielectric coating layer over the metallic layer to protect the coating from being oxidized in the air or from scratched. For enhanced metallic coatings, a stack of dielectric layers are added on the metallic coating to increase reflectance for a particular wavelength range.

  • IBAR : IR Broadband AR Coatings : Coatings for 3-5 µm and 8 – 12 µm bands

Infra-red broadband anti-reflection coatings are offered for the two broad spectral passbands of 3 – 5 µm and 8-12 µm. Coatings are designed for the refractive index of the substrate so it is necessary to offer separate coatings for different substrate materials. Standard coatings are offered for Zinc Selenide and Germanium. These coatings are highly durable and can be cleaned repeatedly using normal optics handling techniques. They are suitable for high power laser use such as that emitted from a CO2 laser.


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