Alloy Steel Lost Wax Casting Manufacturer – Custom Sand Casting of Grey Cast Iron – RMC Foundry

Short Description:

Cast alloy steel should be used when the strength of the casting is relatively high and the use of cast iron cannot meet the requirements. However, the fluidity of molten steel of cast steel is not as good as that of cast iron, so the thickness of the pouring structure should not be too small and the shape should not be too complicated. When the silicon content is controlled at the upper limit, the fluidity of molten steel can be improved.

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Alloy Steel Lost Wax Casting Manufacturer – Custom Sand Casting of Grey Cast Iron – RMC Foundry Detail:

China OEM custom sand castings of grey iron with CNC machining services. 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
USA	ASTM A48	-	NO.25	NO.30	NO.35	NO.45	NO.50
Germany	DIN 1691	GG10	GG15	GG20	GG25	GG30	GG35
Austria	DIN 1691	GG10	GG15	GG20	GG25	GG30	GG35
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

Gray Iron Comparison				Casting Wall Thickness/mm	Chemical Composition（％）					Microstructure（Volume Fractions）（％）
China（GB/T 9439)	ISO 185	ASTM A48/A48M	EN 1561	Casting Wall Thickness/mm	C	Si	Mn	P ≦	S ≦	Matrix Structure
HT100 (HT10-26)	100	No.20 F11401	EN-GJL-100	-	3.4-3.9	2.1-2.6	0.5-0.8	0.3	0.15	Pearlite: 30-70％, coarse flakes; Ferrite: 30-70％; Binary Phosphorus Eutectic: ＜7％
HT150 (HT15-33)	150	No.25A F11701	EN-GJL-150	＜30 30-50 ＞50	3.3-3.5 3.2-3.5 3.2-3.5	2.0-2.4 1.9-2.3 1.8-2.2	0.5-0.8 0.5-0.8 0.6-0.9	0.2	0.12	Pearlite: 40-90％, medium coarse flakes; Ferrite: 10-60％; Binary Phosphorus Eutectic:＜7％
HT200 (HT20-40)	200	No.30A F12101	EN-GJL-200	＜30 30-50 ＞51	3.2-3.5 3.1-3.4 3.0-3.3	1.6-2.0 1.5-1.8 1.4-1.6	0.7-0.9 0.8-1.0 0.8-1.0	0.15	0.12	Pearlite: ＞95％, medium flakes; Ferrite＜5％; Binary Phosphorus Eutectic＜4％
HT250 (HT25-47)	250	No.35A F12401 No.40A F12801	EN-GJL-250	＜30 30-50 ＞52	3.0-3.3 2.9-3.2 2.8-3.1	1.4-1.7 1.3-1.6 1.2-1.5	0.8-1.0 0.9-1.1 1.0-1.2	0.15	0.12	Pearlite: ＞98％ medium thin flakes; Binary Phosphorus Eutectic:＜2％
HT300 (HT30-54)	300	No.45A F13301	EN-GJL-300	＜30 30-50 ＞53	2.9-3.2 2.9-3.2 2.8-3.1	1.4-1.7 1.2-1.5 1.1-1.4	0.8-1.0 0.9-1.1 1.0-1.2	0.15	0.12	Pearlite: ＞98％ medium thin flakes; Binary Phosphorus Eutectic:＜2％
HT350 (HT35-61)	350	No.50A F13501	EN-GJL-350	＜30 30-50 ＞54	2.8-3.1 2.8-3.1 2.7-3.0	1.3-1.6 1.2-1.5 1.1-1.4	1.0-1.3 1.0-1.3 1.1-1.4	0.1	0.1	Pearlite: ＞98％ medium thin flakes; Binary Phosphorus Eutectic:＜1％

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.

Metal and Alloys Grade for Sand Casting
Sand Casting Equipment at RMC Foundry
Sand castings of cast iron