Czech Republic · CSN

C 25 E

CSN EN 10250-2 — Open steel die forgings for general engineering purposes. Non-alloy quality and special steels

Chemical composition

wt% · log scale

min – max range
typical value

Mechanical properties

value range by condition

Chemical composition

Element	min	max	Similar	Remarks
C	0.22	0.29
Cr		0.4
Cr+Mo+Ni		0.63
Mn	0.4	0.7
Mo		0.1
Ni		0.4
P		0.035
S		0.035
Si		0.4

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
die forgings, forgings, normalized or normalized and tempered, <= 100 mm, forged bars	230	440	23		35
die forgings, forgings, normalized or normalized and tempered, > 100 <= 250 mm, forged bars	210	420	17；23		20；30
die forgings, forgings, normalized or normalized and tempered, > 250 <= 500 mm, forged bars	190	400	17；23		15；25
die forgings, forgings, normalized or normalized and tempered, > 500 <= 1000 mm, forged bars	180	390	16；22		15；20
die forgings, forgings, quenched and tempered, <= 70 mm, forged bars	270	450	25		45
die forgings, forgings, quenched and tempered, > 160 <= 330 mm, forged bars	210	390	16；24		20；33
die forgings, forgings, quenched and tempered, > 70 <= 160 mm, forged bars	220	410	18；25		25；38

Heat treatment

Type	1
Heat-treatment curve	Hardness-Tempering