SPHEROIDAL GRAPHITE (SG) DUCTILE IRON4 Tonnes

Whereas the graphite appears in Grey Irons in the form of flakes, which gives minute fracture lines within the structure of the iron, in SG irons the graphite is modified by small additions of magnesium.

The magnesium causes the graphite to 'ball' whilst still in molten solution. On solidifying the graphite remains in this spheroidal shape and creates a matrix with no built in fracture lines.

This modified structure gives SG Iron a greater ability to bend before fracture, an increase in ductility and resistance to shock allowing suitable alternatives to some carbon steels and malleable irons.

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N/mm²
BS 1452:1990

 Tons/in²
BS 1452:1961
(Superseded)		 Hardness Material Properties
900/2 47/2 302-359 BHN High strength, low ductility, hard
800/2, 700/2, 600/3* 37/2 190-350 BHN High strength, low ductility
500/7*, 450/10 32/7 160-240 BHN Strength with reasonable ductility
420/12*, 400/15 27/12 212 Max BHN Strength with reasonable ductility
400/18, 350/22 24/17 180 Max BHN High resistance to impact
European Material Numbers
EN 1563:1997

 Tons/in² / % Elongation
(Superceded)

 N/mm² / % Elongation
BS2789:1985
(Superceded)		 Descriptive Symbols Prefix EN-GJS
L = Low Temp.
R = Room Temp.
EN-JS-1010, EN-JS-1014, EN-JS-1015   350/22, 350/22L 350/22, 350/22-LT, 350/22-RT
EN-JS-1020, EN-JS-1024, EN-JS-1025 SG 24/17 400/18, 400/18L 400/18, 400/18-LT, 400/18-RT
EN-JS-1030, EN-JS-1040 SG 27/12 400/12 400/15, 450/10
EN-JS-1050 SG 32/7 500/7 500/7
EN-JS-1060 SG 37/2 600/3 600/3
EN-JS-1070, EN-JS-1080, EN-JS-1090 SG 47/2 700/2, 800/2, 900/2 700/2, 800/2, 900/2
Hardness Range (BHN) Material Number EN 1563:1997
>160 EN-JS-2010
130-175 EN-JS-2020
135-180 EN-JS-2030
160-210 EN-JS-2040
170-230 EN-JS-2050
190-270 EN-JS-2060
225-305 EN-JS-2070
245-335 EN-JS-2080
270-360 EN-JS-2090