Italy · UNI

HS2-9-1-8

UNI EN ISO 4957:1999 — Tool steels

Chemical composition

wt% · log scale

min – max range
typical value

Mechanical properties

value range by condition

Physical properties

vs. temperature

Mean thermal expansion 10⁻⁶/K

Chemical composition

Element	min	max	Similar	Remarks
C	1.05	1.15
Co	7.5	8.5
Cr	3.5	4.5
Mn		0.4
Mo	9	10
P		0.03
S		0.03
Si		0.7
V	0.9	1.3
W	1.2	1.9

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
bars, round bars +A, HB						扁钢 277.00
bars, round bars +A+C, HB						扁钢 327.00
bars, round bars +A+CR, HB						扁钢 347.00
bars, HR, round bars, quenched and tempered						扁钢 66

Physical properties

Temperature

20.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
217.00		19.00	460.00	0.65	8.30

100.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	11.00

200.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	11.50

300.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	11.90

400.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.30

500.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.40

600.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.50

700.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.50

Typical physical values

Density	Elastic modulus	Poisson's ratio	Remarks
7.80	190.00–210.00	0.27–0.30	高碳高合金钢的典型属性数值。此值不来源于标准，它是指示性指标，不能被用于设计用途。

Heat treatment

Type	1
Heat-treatment curve	TTT
Heat-treatment curve	Hardness-Tempering
Heat-treatment curve	CCT

Similar grades

Grade	Region	System
1.3247	Italy	UNI
1.3247	Spain	UNE
HS2-9-1-8	Spain	UNE
1.3247	Romania	STAS
HS2-9-1-8	Romania	STAS
1.3247	Sweden	SS
HS2-9-1-8	Sweden	SS
1.3247	Switzerland	SNV
HS2-9-1-8	Switzerland	SNV
1.3247	Finland	SFS
HS2-9-1-8	Finland	SFS
1.3247	Poland	PN
HS2-9-1-8	Poland	PN
1.3247	Austria	ONORM
HS2-9-1-8	Austria	ONORM
1.3247	Norway	NS
HS2-9-1-8	Norway	NS
1.3247	Belgium	NBN
HS2-9-1-8	Belgium	NBN
1.3247	Hungary	MSZ
HS2-9-1-8	Hungary	MSZ
HS2-9-1-8	Germany	DIN
1.3247	Czech Republic	CSN
HS2-9-1-8	Czech Republic	CSN
1.3247	Bulgaria	BDS
HS2-9-1-8	Bulgaria	BDS
1.3247	United Kingdom	B.S.
HS2-9-1-8	United Kingdom	B.S.
1.3247	France	AFNOR NF
HS2-9-1-8	France	AFNOR NF