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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

sB

sT

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 10 6

l

r

C

R 10 9

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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