Gray cast iron is the ferrous metal whose cementite decomposes into iron and carbon in the form of graphite which is called graphitization cast irons where a large percentage of cementite is decomposed by graphitization.
Gray Iron Material Grades
Country
Standard
Equivalent Grades of Grey Iron (Gray Cast Iron)
ISO
ISO 185
100
150
200
250
300
350
China
GB 9439
HT100
HT150
HT200
HT250
HT300
HT350
USA
ASTM A48
-
NO.20
NO.30
NO.35
NO.40
NO.50
NO.25
NO.45
Germany
DIN 1691
GG10
GG15
GG20
GG25
GG30
GG35
Austria
European
EN 1561
EN-GJL-100
EN-GJL-150
EN-GJL-200
EN-GJL-250
EN-GJL-300
EN-GJL-350
Japan
JIS G5501
FC100
FC150
FC200
FC250
FC300
FC350
Italy
UNI 5007
G10
G15
G20
G25
G30
G35
France
NF A32-101
-
FGL150
FGL200
FGL250
FGL300
FGL350
UK
BS 1452
100
150
200
250
300
350
India
IS 210
-
FG150
FG200
FG260
FG300
FG350
Spain
UNF
-
FG15
FG20
FG25
FG30
FG35
Belgium
NBN 830-01
FGG10
FGG15
FGG20
FGG25
FGG30
FGG35
Australia
AS 1830
-
T150
T220
T260
T300
T350
Sweden
SS 14 01
O110
O115
O120
O125
O130
O135
Norway
NS11 100
SJG100
SJG150
SJG200
SJG250
SJG300
SJG350
Min. Tensile Strength (Mpa)
100
150
200
250
300
350
Performance Characteristics of Gray Iron Castings:
• Liquid gray iron has good fluidity, and its volume shrinkage and linear shrinkage are small, and the notch sensitivity is small
• Low comprehensive mechanical properties, compressive strength is about 3~4 times higher than tensile strength
• Good shock absorption, the shock absorption of gray iron is about 10 times greater than that of cast steel
• Gray iron has low modulus of elasticity
Structural Characteristics of Gray Iron Castings:
• Small wall thickness and complex shapes are available
• The residual stress of the casting is small
• Gray iron castings should not be designed with very thick structures, and asymmetrical sections are often used to make full use of their compressive strength
Sand casting process offers the greatest flexibility and the most cost-effective tooling. Our sand casting foundry is equipped with a complete metallurgical laboratory to determine the chemical and mechanical characteristics of each melt and to analyse the metallugic condition of the molten metal before pouring. Microsections are examined under the microscope to obtain final information on the solified casting. We issue 3.1 certificate for each delivered part on customer request. Cast irons are the ferrous alloys which have carbon contents of more than 2%. Though cast irons can have a carbon percentage between 2 to 6.67, the practical limit is normally between 2 and 4%. These are important mainly because of their excellent casting qualities. The gray cast irons and ductile cast irons (also called nodular cast iron or spheroidal graphite iron).
Our Advantages in Sand Casting Field:
• Tens of years of experience in sand casting, shell molding casting and machining technology.
• Dimensionally accurate cores for complex internal contours.
• Extensive consulting which starts in the design phase.
• Quality management throughout the production process and maximum process reliability.
Available Grade of Gray Iron at RMC Sand Casting Foundry: HT150, HT200, HT250, HT300, HT350; GJL-100, GJL-150, GJL-200, GJL-250, GJL-300, GJL-350; GG10~GG40.
RMC, a China iron foundry, is producing various grey iron casting products for overseas customers in USA, Australia, UK, Spain, Germany, Norway, Finland, Russia and Italy. Production according to standards ASTM A48, A536; DIN 1691, 1693; ISO 185, 1083; EN 1561, 1563; DIN 1691, 1693; AS 1830, 1831; JIS, UNI, NF, BS, UNF, NBN, AS, SS, NS. Material grades including:
ISO185: 100 150 200 250 300
ASTM A48: NO.20 NO.25 NO.30 NO.35 NO.40 NO.45
DIN 1691: GG10 GG15 GG20 GG25 GG30
EN 1561: EN-GJL-100 EN-GJL-150 EN-GJL-200 EN-GJL-250 EN-GJL-300
BS 1452: 100 150 200 250 300
AS 1830: T150 T220 T260 T300
Production Process:
Sand Casting, Automatic Molding, Machine Molding, Shell Molding, Green Sand Casting, Resin Sand Casting"
Gray Iron Applications:
The following is the common application for each degree of grey cast iron for your reference.
HT100 (GG10, EN-GJL-100):
For small loads, the friction and wear no special requirements for important castings, such as protective cover, cover, oil pan, hand wheels, frame, floor, hammer, small handle, etc.
HT150 (GG15, EN-GJL-150):
Under moderate load of castings, such as the base, frame, box, knife, bed, bearing seat, table, wheels, cover, pump, valve, pipe, flywheel, motor blocks and other
HT200 (GG20, EN-GJL-200):
Requirements withstand greater load and a certain degree of tightness or corrosion resistance of the more important castings such as cylinder, gear, base, flywheels, bed, cylinder block,cylinder liner, piston, gear box, brake wheel, coupling Plate, medium pressure valve, etc.
HT300(GG30, EN-GJL-300):
Under high load, wear and high air tightness important castings, such as heavy machine tools, shears, presses, automatic lathe bed, frame, frame, high-pressure hydraulic parts, piston rings, force larger gear, Cams, bushings, large engine crankshaft, cylinder block, cylinder liner, cylinder head, etc.
For more information sand casting grey cast iron, Cast Iron and Cast Steel, please get in touch with us!