Grade Colour Code: White
Unibar 250 is a pearlitic-ferritic iron that offers a good combination of strength and wear resistance over Unibar 200, while still possessing good machinability and an excellent surface finish. Due to the graphite structure in Unibar 250 noise and vibration damping along with thermal conductivity are excellent in this grade.
Standard cut length of our cast iron products is 3080mm, other lengths available on request.
|25mm – 700mm||25mm x 25mm – 550mm x 550mm||Up to 780mm x 550mm||Sizes and profiles to customer design available on request|
|Material Section mm||Tensile Strength |
|20 < D ≤ 50||195||160 - 230||Pearlitic - Ferritic|
|50 < D ≤ 100||180|
|100 < D ≤ 200||165|
|200 < D ≤ 400||155|
|400 < D ≤ 700||155|
Contains type ‘A’ graphite flakes in accordance with ISO 945. The rim contains fine type ‘D‘ and ‘E‘ interdendritic graphite. The matrix is greater than 50% pearlitic. The rim is predominantly ferritic and may contain up to 5% dispersed fine carbides.
Unibar 250 is not recommended for hardening or heat treatment applications.
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.
(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|
(D Diameter, B Width)
|Min. Machining Allowance mm (per side)|
|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 grey iron Unibar 250 is ideal for an exceptionally wide range of applications. Because of its structure and the mechanical properties it is suitable for the processing within the automotive and glass industries as well as for various applications in the hydraulic and pneumatic section, the machinery and machine tool industry and for pumps and compressors.
In many ways, Unibar 250 has a lot of advantages to compete with other materials such as steel, aluminum or the traditional sand casting.
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 250 is available in your required size, please have a look at our online stock list. Register and keep track of the currently available quantities.