VANGUARD FOUNDRY LTD.

Special cast irons covers a multitude of materials but high silicon-molybdenum and austempered ductile irons are two in regular production at Vanguard Foundry Ltd. High silicon-molybdenum irons were developed to meet the increasing demand for high strength ductile irons capable of operating at high temperatures. This material ideally suited applications such as manifolds and turbocharger housings where strength, oxidation resistance, structural stability and resistance to thermal cycling are key to performance. Austempered ductile iron was developed to provide a cost effective material with high strength but more importantly excellent wear resistance. The combination of strength and resistance to abrasion whilst retaining some ductility make it an ideal material for agriculture, construction, mining, gears, and many other diverse applications.

 

High Silicon Molybdenum Irons
	chemical analysis						mechanical analysis
Vanguard designation	C %	Si %	Mn %	S %	Mo %	Mg %	tensile strength N/mm² minimum	0.2% proof stress N/mm² minimum	elongation %
0.5 to 0.7 SiMo	3 to 3.4	3.8 to 4.2	0.4 max	0.15 max	0.5 to 0.7	0.03 to 0.08	460	310	8
0.7 to 1.25 SiMo	3.2 to 3.8	4.0 to 5.0	0.4 max	0.15 max	0.7 to 1.25	0.03 to 0.08	550	480	5
notes: 1) The above internal specifications were created to accommodate the slight variations in customer to customer requirements. On the very infrequent occasions that the customer's specification falls outside this range Vanguard's versatility means that most variations can be produced. 2) Typically these materials will be subject to a ferritising heat-treatment (anneal).

BS EN 1564: 1997 Austempered Ductile Iron (ADI)
material designation		tensile strength N/mm² minimum	0.2% proof stress N/mm² minimum	elongation %	Brinell hardness HB
symbol	number
EN-GJS-800-8	EN-JS-1100	800	500	8	260 to 320
EN-GJS-1000-5	EN-JS-1110	1000	700	5	300 to 360
EN-GJS-1200-2	EN-JS-1120	1200	850	2	340 to 440
EN-GJS-1400-1	EN-JS-1130	1400	1100	1	380 to 480

 

ASTM 897M-03 Austempered Ductile Iron (ADI)
grade	tensile strength N/mm² minimum	0.2% proof stress N/mm² minimum	elongation %	Brinell hardness HB
1	900	650	9	269 to 341
2	1050	750	7	302 to 375
3	1200	850	4	341 to 444
4	1400	1100	2	388 to 477
5	1600	1300	1	402 to 512

back to top of the page

Many custormers ask for castings to be produced to their own material specification and Vanguard has the flexibility to cope with this demand.
For other customers Vanguard produce castings that meet international standards.
The specification for ductile iron to EN 1563 1997 is shown below with equivalent international standards shown in a separate table.

EN 1563 Ductile Iron Specifications
Mechanical properties as measured on separately cast test bars.
material designation		tensile strength N/mm²	0.2% proof stress N/mm²	elongation %
symbol	number
EN-GJS 350-22	EN JS1010	350	220	22
EN-GJS 350-22LT	EN JS1015	350	220	22
EN-GJS 400-18	EN JS1020	400	250	18
EN-GJS 400-18LT	EN JS1025	400	240	18
EN-GJS 400-15	EN JS1030	400	250	15
EN-GJS 450-10	EN JS1040	450	310	10
EN-GJS 500-7	EN JS1050	500	320	7
EN-GJS 600-3	EN JS1060	600	370	3
EN-GJS 700-2	EN JS1070	700	420	2
EN-GJS 800-2	EN JS1080	800	480	2
EN-GJS 900-2	EN JS1090	900	600	2
notes: LT = low temperature 1 N/mm² = 1 Mpa

 

International Specifications Equivalent to EN 1563:1997
Mechanical properties as measured on separately cast test bars.
material designation EN 1563		UK BS 2789 1985	Germany DIN 1693 1973	Netherlands NEN 6002-D 1966	Italy UNI 4544 1979	Sweden SS 1407 1981	USA ASTM A536 1993	international ISO 1083 1987
symbol	number
EN-GJS 350-22	EN JS1010	350-22						350-22
EN-GJS 350-22LT	EN JS1015	350-22L40	GGG 35.3	GN 38	GS 370-17	17-15		350-22L
EN-GJS 400-18	EN JS1020	400-18		GN 42			60-40-18	400-18
EN-GJS 400-18LT	EN JS1025	100-18L20	GGG 40.3			17-02		400-18L
EN-GJS 400-15	EN JS1030	420-12	GGG 40		GS 400-12	17-00	65-45-12	400-15
EN-GJS 450-10	EN JS1040	450-10					70-50-05	450-10
EN-GJS 500-7	EN JS1050	500-7	GGG 50	GN50	GS 500-7	27-02	80-55-06	500-7
EN-GJS 600-3	EN JS1060	600-3	GGG 60	GN60	GS 600-3	32-03	100-70-03	600-3
EN-GJS 700-2	EN JS1070	700-2	GGG 70	GN70	GS 700-2	37-01		700-2
EN-GJS 800-2	EN JS1080	800-2	GGG 80	GN80	GS 800-2		120-90-02	800-2
EN-GJS 900-2	EN JS1090	900-2						900-2

back to top of the page

Austenitic irons have greater resistance to heat and corrosion when compared to standard grades. Other properties include thermal expansion, magnetic permeability, impact value at low temperatures and erosion resistance will vary with the grade of austenitic iron. Vanguard foundry has both the expertise and the experience to successfully produce these technically demanding materials.

BS 3468 1986 Austenitic Iron Specifications
Chemical and mechanical properties.
type	grade	C (max) %	Si %	Mn %	Ni %	Cu %	Cr %	Nb %	P (max) %	Mg %	tensile strength N/mm² minimum	0.2% proof stress N/mm² minimum	elongation %	Charpy impact strength (min) J@20±5°C
flake graphite	F1	3.0	1.5 to 2.8	0.5 to 1.5	13.5 to 17.5	5.5 to 7.5	1.0 to 2.5		0.2		170	-	-	-
	F2	3.0	1.5 to 2.8	0.5 to 1.5	18.0 to 22.0	0.5 max	1.0 to 2.5		0.2		170	-	-	-
	F3	2.5	1.5 to 2.8	0.5 to 1.5	28.0 to 32.0	0.5 max	2.5 to 3.5		0.2		190	-	-	-
spheroidal graphite	S2	3.0	1.5 to 2.8	0.5 to 1.5	18.0 to 22.0	0.5 max	1.5 to 2.5		0.8		370	210	7
	S2W	3.0	1.5 to 2.2	0.5 to 1.5	18.0 to 22.0	0.5 max	1.5 to 2.5	0.2 to 1.2	0.8	0.06 max	370	210	7
	S2B	3.0	1.5 to 2.8	0.5 to 1.5	18.0 to 22.0	0.5 max	2.5 to 3.5		0.8		370	210	7	4
	S2C	3.0	1.5 to 2.8	0.5 to 2.5	21.0 to 24.0	0.5 max	0.5 max		0.8		370	170	20	20
	S2M	3.0	1.5 to 2.5	4.0 to 4.5	21.0 to 24.0	0.5 max	0.2 max		0.8		420	200	25	15
	S3	2.5	1.5 to 2.8	0.5 to 1.5	28.0 to 32.0	0.5 max	2.5 to 3.5		0.8		370	210	7
	S5S	2.2	4.8 to 5.4	1.0 max	34.0 to 36.0	0.5 max	1.5 to 2.5		0.8		370	210	7
	S6	3.0	1.5 to 2.8	6.0 to 7.0	12.0 to 14.0	0.5 max	0.2 max		0.8		390	200	15
notes: 1 N/mm² = 1 Mpa Flake graphite specifications are shown for interest only. Vanguard Foundry only produce the spheroidal graphite grades.

back to top of the page