Dec 30 2015 0
Dec 30, 2015

MARCROME is a superior hard chrome plated steel bar renowned for its strength, smoothness and its 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 offers 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 – 152.4mm 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 Australia.

Disadvantages of Conventional Plating

Conventional plating using either the batch or clamping methods can result in non-concentric chrome deposits which are detrimental to seal life and impacts adversely on the life of components. The uneven thickness of the chrome layer often requires resizing by grinding.

Advantage of new Technology

Precise deposits of thickness, concentricity and longitudinal evenness .These advantages translate into longer, lower cost, service life for the end user. Bars are now 100% usable with no ‘burn or nest’ marks from the hangers which support the bars in traditional processes. This represents an improvement in yield of 3%.

Applications

Mostly in the form of hydraulic and pneumatic cylinders used on: Earth moving equipment, drilling and mining equipment, long wall mining supports, mobile and stationary cranes as well as agricultural machinery.

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 &
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) 19 mm to 152.4 mm up to 7.5 m
SURFACE ROUGHNESS
0.1 – 0.3 microns Rq
CHROME THICKNESS
< 20 mm Ø min 15 micron
> 20 mm Ø min 20 micron

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