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Unibar GF

Grade Colour Code: Silver
Special Qualities
Glass Industry Grades

Unibar GF contains a predominantly ferritic structure with fine undercooled graphite type (D/E). The fine film of graphite gives an improved surface finish with exceptional machinability, while the ferritic matrix encourages improved heat extraction from the material, due to its excellent heat conductivity, minimizing dimensional growth during the heating and cooling cycles. Noise and vibration damping are good in this grade.

Profile and Size Range

Standard cut length of our cast iron products is 3080mm, other lengths available on request.

Round Square Rectangle Special Profiles
25mm – 700mm 25mm x 25mm – 550mm x 550mm Up to 780mm x 550mm Sizes and profiles to customer design available on request

Mechanical Properties

Material Section
Tensile Strength
20 < D ≤ 60 150 140 - 180 Predominantly Ferritic
  60 < D ≤ 120 130
120 < D ≤ 400 115
400 < D ≤ 700 105


The ferritic structure of Unibar GF containing fine undercooled type ‘D’ & ‘E’ graphite flakes in accordance with ISO 945. The rim also contains type ‘D’ & ‘E’ interdendritic graphite, but finer. The matrix structure is predominantly ferritic with a maximum of 10% pearlite throughout. Supplied in the annealed condition.

Heat Treat Response

Unibar GF cannot be hardened by heat-treatment.

Ancillary Processes

Both, our foundries and our local distribution centres offer various services to deliver pre-machined products to our customers. Pre-machined Unibar material will save valuable production time, improve the cost effectiveness and eliminate waste in your own production, allowing you to focus on the key design elements of your products.


Cutting to specified length in quantities as little as one piece to large volumes, prepared to meet the requirement of your automatic machining systems.


Turning of round bars to required size to meet specific requirements and to minimise the machining operations of our customers. Unibar turned therefore comes with a standard tolerance of +1mm, although after consultation we can offer alternatives to suit all of our customers‘ requirements.


Single and duplex machines offer milling of square and rectangular bars to specified dimensions and agreed tolerances. We can offer our customers milling on either four or six faces for further processing.


In the case of machined Unibar with diameters of less than 110mm as an alternative to Unibar turned we can offer Unibar peeled by peeling off the oxidised surface layer of the cast bar. As these are smaller dimensions and involve a different machining process, the tolerances offered are more precise, for example h11.


Longitudinal boring as deep as 1000mm is possible by using single head boring and trepanning machines. Unibar tubes can be supplied with the exterior surface as-cast or machined. These two variants can be complemented by a wide selection of internal measurements, which can range from 30mm to 500mm.

Dimensional Tolerances (Grey/Flake)

(As-Cast Diameter mm)
Ovality Allowances
Max. Swell Allowances mm
20 < (D OR B) ≤ 50 - 5
  50 < (D OR B) ≤ 100 1 7
100 < (D OR B) ≤ 200 2 10
200 < (D OR B) ≤ 300 4 12
300 < (D OR B) ≤ 400 5 15
> 400 By agreement By agreement

Machining Allowances (Grey/Flake)

(D Diameter, B Width)
Min. Machining Allowance mm (per side)
Round Square/Rectangle
20 < (D OR B) ≤ 50 2 2.5
  50 < (D OR B) ≤ 100 3 3.5
100 < (D OR B) ≤ 200 4 4.5
200 < (D OR B) ≤ 300 6 6.5
300 < (D OR B) ≤ 400 7 7.5
400 < (D OR B) ≤ 500 9 9.5
500 < (D OR B) ≤ 650 11 11.5

For rectangular bars the width is the longer dimension of the cross section. Machining allowances of our continuously cast iron bars can be adjusted to meet customer requirements, subject to discussion, prior agreement and special order. For further information please contact our nearest distribution centre.


Our special quality Unibar GF was developed for the glass industry sector. Unibar GF is thereby suitable for various applications within the manufacture of glass products, primarily used for the production of glass moulds and glass mould neck rings.

Due to its exceptional structural and mechanical properties Unibar GF is used to replace other materials such as sand castings.


  • Improved machinability
  • Excellent surface finish
  • 10% weight reduction against steel
  • Excellent vibration damping
  • Faster turning and grinding times
  • Finer grain structure than with sand casting
  • Absence of sand inclusions or cast dimensional problems
  • Elimination of costly patterns
  • Availability from stock

Do you need any further information about our continuously cast iron products? You will find the appropriate data sheets as well as our technical manual in our download section.

To find out whether Unibar GF is available in your required size, please have a look at our online stock list. Register and keep track of the currently available quantities.