Technical Information
 
Definition:
 

Full name of S.G. Iron is Spheroidal Graphite Iron also called as Nodular OR Ductile Iron. In Graded cast iron graphite appears in the form of flakes, which gives minute fracture lines within the structure of the iron while in S.G.Iron the graphite is modified by small addition of magnesium. The magnesium causes the graphite to "ball" whilst still in molten solution, in solidifying; the graphite remains in this spheroidal shape and creates a matrix with no built in fracture lines.

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

Before the advent of European Material numbers the descriptive code (xxx / yy) represented the following physical properties.

xxx - Number : Represents tensile strength in N / mm2

yy- Number : Represents % elongation before fracture.

(i.e. 420 / 12 = 420 N / mm2 tensile strength and 12% Elongation.)

S.G. Iron Technical specification:

MetricN/mm2 / % Elongation.
BS 2789 : 1985
ImperialTons/In2/ %
Elongation
New European Material Number.
EN 1563 : 1997
Material Description
Hardness
900 / 2
47 / 2
EN-JS-1090
High strength, Low ductility and Hard
302 – 359 BHN
800 / 2
47 / 2
EN-JS-1080
High strength, Low ductility
190 – 350 BHN
700 / 2
47 / 2
EN-JS-1070
High strength, Low ductility
190 – 350 BHN
600 / 3
37 / 2
EN-JS-1060
High strength, low Ductility
190 – 350 BHN
500 / 7
32 / 7
EN-JS-1050
Strength with reasonable ductility
160 – 240 BHN
450 / 10
32 / 7
EN-JS-1040
Strength with reasonable ductility
160 – 240 BHN
420 / 12
27 / 12
EN-JS-1030
Strength with reasonable ductility
212 Max BHN
400 / 18
24 / 17
EN-JS-1020
High resistance to Impact
180 Max BHN
350 / 22
EN-JS-1010
High resistance to Impact
180 Max BHN

 

S.G.Iron Technical Specification for South Africa: SABS 936 / 937

Grade
Tensile Strength in
N / mm2
Proof Stress in
N / mm2
Elongation (Min)
Hardness
Structure
SG38
375
245
17
< 180 BHN
Ferrite
SG42
410
275
12
< 200 BHN
Ferrite
SG50
490
345
7
170 – 240 BHN
Ferrite & Pearlite
SG60
590
390
4
210 – 250 BHN
Pearlite
SG70
685
440
3
230 – 300 BHN
Pearlite

 
 
 
 
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