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
150 10
140 – 200 10
180
180 12
150 – 200 12
220
220 14
160 – 210 14
250
250 17
170 – 240 17
300
300 20
190 – 270 20
350
350 23
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
400 25.9
<179 SG 24/17 18
420/12
420 27.2
<212 SG 27/12 12
500/7
500 32.4
170 – 241 SG 32/7 7
600/3
600 38.9
192 – 269 3
700/2
700 45.3
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.

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