Marchrome

MARCROME® is a superior hard chrome plated steel bar renowned for its strength, smoothness, corrosion and wear resistance. MARCROME® is used primarily as piston rod material in hydraulic and pneumatic equipment operating in conditions of high stress, abrasive and corrosive environments. The powerful performance, weldability and machinability of MARCROME® is second to none – the perfect solution for piston, hydraulic and pneumatic applications. These features are synonymous with: wear resistance, corrosion resistance, superior mechanical strength, fine dimensional tolerances, and a smooth surface. These features ensure longevity and performance every time.

Milltech’s ongoing capital expenditure to upgrade its Continuous Chrome Plating process means it is now able to offer the full 19 – 160mm Ø range produced by this process.

The continuous plating process employed by Milltech represents the newest and most advanced technology in Chrome Plating.

Unlike the clamping system generally used globally, the through feed plating process is a true continuous process which together with axial rotation of the bars through the plating bath ensures perfectly concentric deposition of chrome. This eliminates the problems of ovality and the “dog bone” effect that can occur with other processes.

We are now able to offer lengths to 7.5m as standard with longer lengths available on enquiry.

Full adoption of this advanced technology will ensure Milltech Martin Bright’s ongoing role as the leader in the supply of chrome bar in Australian and international markets.

HIGH GRADE BASE METAL

STEEL GRADE METAL FINISHING PROCESS YIELD STRENGTH MPa TENSILE STRENGTH MPa ELONGATION % (5D) HB BRINELL HARDNESS
AISI 1045  Drawn or Peeled  700 470  800 670  9 20  230 200
AISI 1045 Induction Hardened  Turned - - -  Core 200 HB Case 55-60 HRc
AISI 4140 Hardened and Tempered  Turned  800  930  20  280
AISI 4140 H&T Induction  Hardened  Turned  800  950  18  Core 280 HB Case 55-60 HRc


DIAMETER LENGTH
Sizes (larger on enquiry)  19mm to 152.4mm  up to 7.5m


SURFACE ROUGHNESS CHROME THICKNESS
0.1-0.3 microns Rq  <20mm Ø min 15 microns
 >20mm Ø min 20 microns

DIMENSIONAL TOLERANCE

DIAMETER TOLERANCE
 mm  inches  mm  inches
 up to 51  up to 2.0  +0.00,-0.025  +0.00,-0.001
 over 51-102  over 2.0-4.0  +0.00,-0.050  +0.00,-0.002
 over 102  over 4.0  +0.00,-0.075  +0.00,-0.003