Grey Cast Iron Grade SCH25

The classification, chemical composition, mechanical properties, hardness, technological properties，physical properties，Equivalent steels, specification of grey cast iron grade SCH25, СЧ25.

Grade:	SCH25 ( СЧ25 )
Classification:	Gray cast iron

Chemical composition in % for grade SCH25 ( СЧ25)

C	Si	Mn	S	P
3.2-3.4	1.4-2.2	0.7-1	max 0.15	max 0.2

Mechanical properties under Т=20oС for grade SCH25 ( СЧ25)

Assortment	Dimension	Direct	s_B	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	KJ/m²	-
Casting,GOST1412-85			250

Brinell hardness for SCH25 ( СЧ25 ) GOST 1412-85

HB 10^-1= 156 - 260 MPa

Technological properties of the material SCH25 ( СЧ25 )

Linear shrinkage :

1.2 %

Physical properties for grade SCH25 ( СЧ25 )

T	E 10^{- 5}	a 10⁶	l	r	C	R 10⁹
Grade	MPa	1/Grade	Watt/(m·Grade)	kg/m³	J/(kg·Grade)	Ohm·m
20	1		50	7200
100		10			500

Equivalent steels for grade SCH25 ( СЧ25 )

USA	-	A48-40B	Class35B	No.35
Germany	DIN,WNr	GG25
Japan	JIS	FC25	FC250
France	AFNOR		FGL250
England	BS	250	260
Italy	UNI	G25
Belgium	NBN	FGG25
Spain	UNE	FG25
China	GB	HT250
Sweden	SS	0125-00	O125
Poland	PN	Z125	ZI250
Czechia	CSN	422425
Austria	ONORM	GG25	GG250
Inter	ISO	250
Taiwan	-	FC250
COPANT	COPANT	FG250

Specification:

Mechanical properties:
sв - Tensile strength, [MPa]
sT - Yield stress, [MPa]
d5 - Specific elongation at fracture [%]
y - Reduction of area, [%]
KCU - Impact strength, [kJ/ m2]
HB - Brinell hardness, [MPa]

Physical properties:
T - Test temperature, [Grade]
E - Young modulus, [MPa]
a - Coefficient of linear expansion (range 20o - T) , [1/Grade]
l - Termal (heat) condition coefficient, [Watt/(m·Grade)]
r - Density, [kg/m3]
C - Specific heat (range 20o - T), [J/(kg·Grade)]
R - Electrical resistance, [Ohm·m]

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