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Material Unibar GFP

Unibar GFP

Grade Colour Code: Silver with black dot
Special Qualities
Glass Industry Grades

Supplied in the as-cast condition Unibar GFP offers excellent machinability and surface finishes, due to the mainly ferritic structure containing fine undercooled graphite type (D/E). The ferritic matrix encourages improves heat extraction from the material mould due to its greater heat conductivity minimizing dimensional growth during the heating and cooling cycles. The metallization processes are favored by the fine structure and the thermal conductivity of this material. 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
mm
Tensile Strength
N/mm²
Hardness
(BHN)
Matrix
20 < D ≤ 50 230 150 - 210 Ferritic-Pearlitic
  50 < D ≤ 100 210
100 < D ≤ 200 200
200 < D ≤ 400 180

Microstructure

Ferritic structure with fine undercooled graphite flakes (D/E) in accordance with ISO 945. The rim and core of Unibar GFP contains type ‘D’ and ‘E’ interdendritic graphite. The rim structure is fully ferritic and the core structure is predominantly ferritic with 15% to 40% max pearlite in the core.

Heat Treat Response

Unibar GFP 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

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

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.

Milling

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.

Peeling

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.

Boring

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)

Round
(As-Cast Diameter mm)
Ovality Allowances
mm
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)

Section
(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.

Applications

Our special quality Unibar GFP was developed for the glass industry sector. Unibar GFP 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 GFP is used to replace other materials such as sand castings.

Advantages:

  • 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 GFP is available in your required size, please have a look at our online stock list. Register and keep track of the currently available quantities.