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Material Unibar 500+

Unibar 500+

Grade Colour Code: Light Green
SG/Nodular Iron

Comparative Specification:

  • EN-GJS-500-7C according to DIN EN 16482
  • EN-GJS-500-7 according to BS EN 1563 (2011)

Unibar 500+ offers higher wear resistance, strength and heat-treatmetn response compared to Unibar 400-15, with improved ductility (elongation) against standard Unibar 500-7. Whilst complying with the mechanical characteristics required and the hardness values of Unibar 500-7 and encompassing certain hardness levels of Unibar 400-15. The material possesses good machinability and excellent surface finish. 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
Proof Stress
Elongation % Hardness
20 < D ≤ 60 500 320 15 170 - 210 Ferritic
  60 < D ≤ 120 450 300 14
120 < D ≤ 400 420 290 11
400 < D ≤ 700 420 290 11


Unibar 500+ contains type V & VI nodular (spheroidal) graphite in accordance with ISO 945. The rim is predominantly ferritic (≥90%). The core matrix is mixed ferritic/pearlitic (10-40% pearlite). Chill carbides will be less than 5%, well dispersed.

Heat Treat Response

Unibar 500+ can be hardened by conventional methods, but Unibar 600-3 and Unibar 700-2 are recommended.

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 (SG/Nodular)

(As-Cast Diameter mm)
Ovality Allowances
Max. Swell Allowances mm
20 < (D OR B) ≤ 50 - 5
  50 < (D OR B) ≤ 100 2 7
100 < (D OR B) ≤ 200 3 10
200 < (D OR B) ≤ 300 4 12
300 < (D OR B) ≤ 400 5 15
> 400 By agreement By agreement

Machining Allowances (SG/Nodular)

(D Diameter, B Width)
Min. Machining Allowance mm (per side)
Round Square/Rectangle
20 < (D OR B) ≤ 50 3 3.5
  50 < (D OR B) ≤ 100 4 4.5
100 < (D OR B) ≤ 200 5 5.5
200 < (D OR B) ≤ 300 7 7.5
300 < (D OR B) ≤ 400 8 8.5
400 < (D OR B) ≤ 500 10 10.5
500 < (D OR B) ≤ 650 12 12.5

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.


Like the traditional Unibar 500-7 our nodular iron grade Unibar 500+ is also suitable for various applications within the hydraulic and pneumatic industry, the machinery and machine tool section, the automotive industry, for pumps and compressors as well as for the sector of renewable energies.

Due to its mechanical properties Unibar 500+ is often used as a favourable alternative for other materials such as steel, aluminium or sand casting.


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