Grey Iron5 Tonnes

So named because of the colouring of graphite flake present in the alloy. Graphite gives the iron its machinability, but also its weakness as cracks travel along the flakes of graphite frozen in solution.

Basic Alloys, predominantly Carbon in the form of graphite and silicon are used to refine the grain size of the graphite. Manganese and copper are included to strengthen and refine the iron. Chromium to harden and Nickel to strengthen.

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N/mm² BS 1452:1990	Tons/in² BS 1452:1961 ^(Superseded)	European Material Number EN:1561 1997	Typical Applications
100	6.5	EN-JL-1010	Non load applications Weights, drain pipes, decorative, ornamental architectural
150	9.7	EN-JL-1020	Non load applications End covers, hand wheels
200	12.9	EN-JL-1030	Gear cases, gearboxes, machine parts, bases, flywheels wheels, rolls
250	16.2	EN-JL-1040	Moving parts.. Machine tool, gears, pulleys, housings impellors, valve bodies, valves, power transmission, general engineering
300	19.4	EN-JL-1050	Gears, moving and wearing parts, housings
350	22.6	EN-JL-1060	Load and wear parts Gears, planet carriers, machine tool

Imperial BS1452	Britain BS1452:1990	Austria M3191, Denmark DS 11 301, Germany Din 1691, Holland NEN6002-A, Switzerland VSM10691	Belgium, Luxembourg NBN830-01	Finland S.F.S.H 11.52	France N.F.32-101	USA ASTMA48	Meehanite Licensed trade name	Sweden MNC705	BS EN 1651:1997
	400	GG40	FGG40	GRS40	Ft40D	Class 60	GM 400	0140	EN-JL1060
Grade 23	350	GG35	FGG35	GRS35	Ft35D	Class 55	GA 350	0135	EN-JL1060
Grade 21	300	GG30	FGG30	GRS30	Ft30D	Class 50 or 45	GB 300	0130	EN-JL1050
Grade 17	250	GG25	FGG25	GRS25	Ft25D	Class 35	GC 275 GD 250	0125	EN-JL1040
Grade 14	220					Class 30	GE 225
	200	GG20	FGG20	GRS20	Ft20D	Class 25	GE 200	0120	EN-JL1030
Grade 12	180
Grade 10	150	GG15	FGG15	GRS15	Ft15D	Class 20	GF 150	0115	EN-JL1020