SubtitleChrome plated Steel bars Introduction.

Chrome plated steel bars made from this steel are used in applications working in demanding conditions. Applications working in demanding conditions are used in heavy duty and corrosive environment.

Chrome plated steel bars made from 42CrMo4+QT steel have higher strength and harden-ability due to the carbon and chromium content. A-CHROME BOC has high fatigue strength and good low-temperature impact toughness.

We recommend A-CHROME BOC at pistons rods that need good impact toughness.

SubtitleA-CHROME BOC Technical Properties.

  • Diameter Tolerance Standard is ISO-f7. We can provide special tolerance at premium price.

  • Residual Magnetism Standard is Max. 50 Gauss. We can provide special magnetism at premium price.

  • Roundness – max ½ from the diameter tolerance.

  • Surface Roughness is Ra = max 0.20 µm.

  • Surface Hardness due to the chrome Layer hardness is min. 900 HV 0,1.

  • Straightness for ∅<20 [mm] is max 0,3 [mm]/1000 [mm] and for ∅≥20[mm] is max 0,2[mm]/1000[mm].

  • Chrome Layer thickness for ∅≤19.05 [mm] is minimum 15[µm] and for ∅>20[mm] is minimum 20[µm].

  • Corrosion Resistance is given by the salt spray test results. These tests are following the ISO 9227 and ISO 10289 standards. The results of these tests are giving the rating of our products.

ASO HYDRAULICS & PNEUMATICS chrome plated steel bars corrosion resistance.

  • Standard Corrosion Resistance for Φ<20 is R9/120h and for Φ≥20 is R9/200h according to NSS tests.

  • EXTRA Corrosion Resistance for Φ≥20-140 is R10/120h  and R9/500h according to NSS tests.

  • EXTRA PLUS Corrosion Resistance for Φ≥20-140 is  R10/500h according to NSS tests.

We can provide Double Chrome Layer at premium price.

Weldability of A-CHROME BOC is limited. Only with preheating process at maximum 300°C.

Machinability of A-Chrome BOC is good.

Packaging A-CHROME products is supplied in 3 different packaging options.

Standard packaging is made from plastic sleeves or paper tubes (depending on the product’s diameter).

Special Packaging (seaworthy protected) with additional cost is made with aluminum foil or vacuum bags.

As an Extra protection with additional cost we can provide also wooden boxes.

Marking in ASO HYDRAULICS & PNEUMATICS has a full trace-ability.

Each bar is marked individually on the plastic/paper tube with info about the date, product series, diameter, tolerance, resistance at saltwater spray test, heat no. production order and so on. The batch has a label with information regarding: Order no, Item no, Heat no. Steel Grade, total length of the batch, Weight, no of pieces in the batch. A-CHROME BOC chrome plated steel bars are delivered having the Rod end painted in purple.

Steel grade correspondents table.

Mechanical Properties table.

Dimensional Properties table

*Some diameters may be subject to a minimum quantity requested
**Lengths may vary depending on the Chroming process used
***Other diameters, lengths/cut lengths can be provided at premium price

Corrosion Test standards table