Ferrous Metals
Grey Cast Iron
GREY IRON: to BS EN 1561:2011 |
Grade |
Tensile Strength |
N/mm2 |
Tonnes/in2 |
|
Typical Hardness HB |
BS 1452: 1961 (Equivalent) |
150 |
|
140 – 200 |
10 |
180 |
|
150 – 200 |
12 |
220 |
|
160 – 210 |
14 |
250 |
|
170 – 240 |
17 |
300 |
|
190 – 270 |
20 |
350 |
|
200 – 280 |
23 |
Metallurgical control of constituent elements allows the production of a range of traditional Cast Irons which exhibit good vibration absorption and mechanical properties especially in compression. Machine beds up to 400kgs in weight are regularly produced, pump and valve bodies, and components for a wide range of automotive, marine, artistic and infrastructure applications.
Ductile Iron (SG)
DUCTILE IRON (S.G.): to BS EN 1563:2011 |
Grade |
Tensile Strength |
N/mm2 |
Tonnes/in2 |
|
Typical Hardness HB |
BS 2789: 1985 (Equivalent) |
Elongation (%) |
400/18 |
|
<179 |
SG 24/17 |
18 |
420/12 |
|
<212 |
SG 27/12 |
12 |
500/7 |
|
170 – 241 |
SG 32/7 |
7 |
600/3 |
|
192 – 269 |
– |
3 |
700/2 |
|
229 – 302 |
SG 42/2 |
2 |
Spheroidal Graphitic (SG) Irons are produced by modifying the structure of the carbon within the metallurgical structure of the basic Grey Cast Iron just before the casting process takes place. The effect on the mechanical characteristics is fundamental, producing a ductile rather than a brittle Cast Iron. SG Irons have commonly substituted for steel castings or fabricated components due to their excellent ductility, castability and weldability.
Alloy Cast Irons
High Nickel. Chromium and the other alloyed Specialist Irons can be used for castings that require resistance to severe abrasion, corrosion and the effect of high or cycling temperatures and impact resistance.
As an example High Si Mo Irons exhibit high temperature creep and stress rupture strengths. They are specified for numerous automotive manifolds and turbocharger castings. Ni Hard Irons offer Brinell hardness figures in excess of 450. They are used in applications where abrasion resistance is required such as dredging, quarrying, concrete and asphalt production.