Cast Parts With Lamellar Graphite (Gray Iron)

As a material, gray iron is easy to process and hardens well. Gray cast iron is characterized by above-average wear resistance, excellent damping properties as well as very good dimensional stability and impresses with its form and function.

We process cast iron in the following qualities:

Dossmann Factory standard based on DIN-EN-1561: 2012-01

The cast iron grade is determined according to the relevant wall thickness and tensile strength. The Brinell hardness applies only to the specified wall thickness range, they are determined by the shear pin test method. Hardness ranges can be agreed for specific parts of the casting.

Material name/abbreviation

				EN-GJL-200	EN-GJL-250	EN-GJL-300	EN-GJL-350
Number				5.1300	5.1301	5.1302	5.1303
Authoritative Wall Thickness	Property		SI-Unit
2,5 till	Longitudinal Strength	Rm	N/mm²	200	250	300	350
50 mm	Hardness	HB		135–195	155–215	175–235	195-–255
51 till	Longitudinal Strength	Rm	N/mm²	180	220	260	310
100 mm	Hardness	HB		125–185	145–205	160–220	180–240
101 till	Longitudinal Strength	Rm	N/mm²	160	200	240	280
200 mm	Hardness	HB		With wall a thickness > 100 mm
				the varieties are not classified by hardness.

Mechanical Properties – informative (in cast samples Ø 30 mm) Perlite
Matrix				Perlite	Perlite	Perlite	Perlite
Longitudinal Strength		Rm	N/mm²	200 to 300	250 to 350	300 to 400	350 to 450
0.1% Elongation Limit		Rp_0,1	N/mm²	130 to 195	165 to 228	195 to 260	228 to 285
Ultimate Elongation/Fracture Strain		A_tot	%	0.8 to 0.3	0.8 to 0.3	0.8 to 0.3	0.8 to 0.3
Compressive Strength		σ_db	N/mm²	720	840	960	1080
Flexural Strength		σ_bB	N/mm²	290	340	390	455
Shearing Resistance		σ_aB	N/mm²	230	290	345	400
Torsional Strength		Τ_tB	N/mm²	230	290	345	400
E-Module (load-dependant)		E	kN/mm	88 to 113	103 to 118	108 to 137	123 to 143
Poisson Number		ν	—	0.26	0.26	0.26	0.26
Bending Strength		σ_bW	N/mm²	90	120	140	145
Fatigue Strength		σ_zdW	N/mm²	50	60	75	85
Fracture Toughness		K_ic	N/mm³/²	400	480	560	650

Physical Properties – informative (in cast samples Ø 30 mm)
Density		ρ	g/cm³	7.15	7.20	7.25	7.30
Specific Heat Capacity		c	J/(kg * K)	20 °–200 °C = 460		20 °–600 °C = 535
Thermal Expansion Coefficient		α	μm/m * K)	20 °–200 °C = 11.7		20 °–400 °C = 13.0
Thermal Conductivity (100–500 °C)		λ	W/(m * K)	50.0–46.0	48.5–44.5	47.5–43.0	45.5–41-5
Coercivity		Η₀	A/m	560 to 720
Maximum Permeability		μ	μН/m	220 to 330
Hysteretic Loss at B = 1T			J/m³	2,500 to 3,000
Spec. Electric Resistance		ρ	Ω * mm²/m	0.77	0.73	0.7	0.67

Comparable Kinds of Norms
ISO R 185			Grade	200	250	300	350
ASTM A 48 (USA)			Class	30	35/40	45	50

Inquiry

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Dossmann GmbH
Eisengiesserei und Modellbau

Amorbacher Straße 43
74731 Wallduern-Rippberg
Telephone +49 6286 18-0
Fax +49 6286 18-20

Cast Parts With Lamellar Graphite (Gray Iron)

Dossmann Factory standard based on DIN-EN-1561: 2012-01

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