Quoted Items
Chrome Plated Material Standard
Chrome Plated Material Standard- PS #CP01
Purpose:
The purpose of this standard is to clarify Parker Steel’s default product delivery expectations.
Scope:
By signing below, the supplier contracts with Parker Steel to ensure that the requirements are a part of their internal work order instructions for Parker Steel and, therefore, delivered material and documentation.
Responsibility:
The supplier is accountable for ensuring that the specifications outlined below will be the standard provisions when processing a Parker Steel purchase order. If PS requires any material type that is not listed or deviates from the specifics of this standard, it shall be noted in detail on each purchase order line item.
Grade(s): C45/C50 = AISI 1045/1050, 42CrMo4 = AISI/ASTM 4140 QT and select stainless steels. BARS MUST BE FULLY CHROMED TO THE ENDS.
Spray tested according to ISO 9227 / ISO 10.289: Rating 9 min
Roundness
½ of the ISO 286-2 (f8 </=20mm) (f7 >/=21mm
Surface
RMS 8 or better / Ra max 0.20
Strength
C45/50 & 1045/1050
Yield = 46,400 psi
Tensile = 75,400 psi minimum
42CrMo4 & 4140
Yield = 16 to 120mm – 106,000 psi
120 to 140mm 100000 psi
Tensile = 16 to 120mm 130,491 to 166,739 psi
120 to 140mm 123,242 to 166,739 psi
HRC 66-69
Straightness
Better than 0.5mm/ 2000mm
Minimum Chrome Plating Thickness
</=20mm .00055 >/=21mm .00078
Hardness (under Chromium)
C45/50 & 1045/1050 = HRC 80/99
IH C45/50 & 1045/1050 = HRC 54/60
42CrMo4 & 4140 = HRC 32/38
Induction Hardening Depth
16 to 20mm = 1mm+/-0.5mm (0.039+/-0.020)
20 to 40mm = 1.5mm+/-0.5mm (0.059 +/-0.020)
40 to 80mm = 2.0mm+/-0.5mm (0.079 +/-0.020)
80 to 140mm = 2.5mm+/-0.5mm (0.098+/-0.020)
Corrosion Resistance of Chromium Layer
Diameter Tolerance
| 3mm to 6mm = -0.010mm/-0.028mm (-0.00039 -0.00110) |
| 6mm to 10mm = -0.013mm/-0.035mm (-0.00051 -0.00137) |
| 10mm to 18mm = 0.016mm/-0.043mm (-0.00063 – 0.00169) |
| 18mm to 20mm = -0.020mm/-0.053mm (-0.00078 -0.00209) |
| 20mm to 30mm = -0.020mm/-0.041mm (-0.00078 -0.0016) |
| 30mm to 50mm = -0.025mm/-0.050mm (-0.00098 -0.0026) |
| 50mm to 80mm = -0.030mm/-0.060mm (-0.00118 – 0.0024) |
| 80mm to 120mm = -0.036mm/-0.071mm (-0.00142- 0.0028) |
| 120mm to 180mm = -0.043mm/-0.083mm (-0.00169 -0.0033) |
| 180mm to 250mm = -0.050mm/-0.096mm (-0.00197- 0.0038) |