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CROMAX® 280X – HARD CHROME BAR

    INFORMATION:

     

    Cromax® 280X is based on a low carbon, microalloyed steel combining high strength with excellent machinability and weldability. For Ø ≤ 90 mm, yield and tensile strength are 20% higher than is normal for hard-chrome bars based on low-carbon weldable steel. This improvement is achieved without detriment to machinability or weldability.

     

    In comparison with standard products based on grade 20MnV6, the superior properties profile of Cromax 280X offers a number of potential advantages in the design and manufacture of fluid-power cylinders, not the least of which is the possibility to downsize piston rods without loss of load-bearing capacity, thereby reducing not only weight but also cost.

    SPECIFICATIONS:

     

  • For Ø≥20 mm, the chrome layer thickness is 20 µm min. For smaller sizes, the minimum thickness is 15 µm
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  • The surface roughness (Ra) is always less than 0.2 µm and normally in the range 0.05-0.15 µm. Rt (ISO) is always less than 2.0 µm and normally in the range 0.5-1.5 µm
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  • The chrome layer hardness is 850 HV0.1min
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  • For Ø<30 mm, the maximum deviation is 0.1 mm/0.5 m. The maximum deviation for larger diameters is 0.1 mm/1.0 m
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  • The out of roundness is maximized at 50% of the diameter tolerance interval
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  • ISO f7 is standard. Other tolerances can be supplied upon request (narrowest range is ISO level 7)

  • TYPICAL MECHANICAL PROPERTIES:

     

    (Ø) <20 mm

     

  • Tensile strength (Rm): 650 – 800 MPa
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  • Yield strength(Re): 520 MPa
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  • Elongation (As): 12%
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  • Hardness (HBW): 200 – 240
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  • Resilience (-20°C): No guarantee
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    (Ø) 20-90 mm

     

  • Tensile strength (Rm): 650 – 800 MPa
  •  

  • Yield strength(Re): 520 MPa
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  • Elongation (As): 19%
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  • Hardness (HBW): 200 – 240
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  • Resilience (-20°C): 27 J
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    (Ø) >90 mm

     

  • Tensile strength (Rm): 550- 700 MPa
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  • Yield strength(Re): 440 MPa
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  • Elongation (As): 19%
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  • Hardness (HBW): 180 – 230
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  • Resilience (-20°C): No guarantee

  • CORRESPONDING STANDARDS:

     

    Below is the closest equivalent standard for the steel in Cromax 280X.

     

  • CROMAX 280X
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  • EN 20MnV6
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  • DIN 20MnV6
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  • BS 55M
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  • AFNOR E420
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  • ASTM A572
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    Ovako Cromax is the major manufacturer in Europe of hard-chrome plated products in the form of bar and tube.

STANDARD SIZES (available in stock)
Diameter (mm)Weight (kg/m)Diameter (inch)(mm)Weight (kg/m)
120.89125.403.97
141.211 1/431.756.22
161.58250.8015.91
182.002 1/263.5024.87
202.47
253.85
305.55
326.31
357.55
409.86
4512.48
5015.41
5518.65
6022.19
7030.21
8039.46
8544.45
9049.94
10061.65
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