Hard chrome bar is a chromium-plated steel product used primarily as piston rod material in all standard applications in hydraulics and pneumatics. Common applications are found in cranes, dump trucks, lifters, garbage compactors, agricultural machinery and production equipment with movable sections.

Because hard chrome bar is normally used in conditions of high stress, friction and harsh climatic environment, the quality of the base metal and surface treatment are of paramount importance. Wear, impact and corrosion resistance, as well as high yield strength, surface smoothness and uniform quality are most important properties of hard chrome bar.

The bulk of our products under the brand Marcrome are supplied by our manufacturing division, OneSteel MBS.

Marcrome specification:

The basic grades of steel used in the manufacture of Marcrome are 1045, 4140 hardened and tempered and 1045 induction hardened.

Grade 1045 steel bar is primarily used in hard chrome bar manufacture due to its wide range of properties consistent with end use applications. Grade 4140 is used in applications where greater yield strength is required and induction hardened grade 1045 is used in applications requiring greater surface impact resistance.

Chromium deposit: Thickness 0.025mm minimum, or 0.050m on the diameter.

Hardness: 1000-1150HV (Vickers Micro Hardness).

 

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	+0.00-0.025	+0.00-0.003

 

Size range: Size 19.05mm - 127mm diameter. Sizes outside this range can be quoted against enquiry.

Length: Can be supplied in lengths 3.6 metres to 7.0 metres. Normally in 4.0 metres for sizes 19.05mm to 25.4mm and 6.0 metres for sizes above 25.4mm.

Finish: 0.10 - 0.30 micrometres Ra. Chrome bar is precision ground to achieve a fine finish.

Packing: All Marcrome bars are packaged in cardboard tubes which provide cushioning against impact damage which may occur in handling and transit. All bars are then boxed.

For ease of identification of the steel grade used in the manufacture of Marcrome, the end plugs of the cardboard tube are colour coded:

Red: 1045

Yellow: 1045 induction hardened

Green: 4140 hardened and tempered

 

Chemical Composition (% by weight)

Grade	C	Mn	Si	P	S	Cr	Mo
1045	0.43 - 0.45	0.60 - 0.90	0.10 - 0.35	0.05 max.	0.05 max.	-	-

 

Atlas Group Holdings Limited ABN 22 098 674 545

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