France · AFNOR NF

XC 18

NF A37-503

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	0.16	0.22
Mn	0.4	0.7
P		0.035
S		0.025
Si	0.15	0.35

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
bars, steel strip, annealed, > 0.5 <= 3 mm, coil		430.00	27
bars, steel strip, annealed, > 0.5 <= 3 mm, HR						卷板 76.00

Physical properties

Temperature

20.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
210.00		58.00	460.00	0.11	7.85

100.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	11.10

200.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.10

300.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	12.90

400.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	13.50

500.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	13.90

600.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	14.10

Typical physical values

Density	Elastic modulus	Poisson's ratio	Remarks
7.86	203.00	0.27–0.30	低碳，低合金钢的典型性能数值。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

Similar grades

Grade	Region	System
20G	Russia	GOST
20	Russia	GOST
1.1151	European Union	EN
C 22 E	European Union	EN
Ck 22	Germany	SEW
C 22 E	Germany	DIN
Ck 22	Germany	DIN
36 Mn 4	Germany	DIN
1.1151	Germany	DIN
1.0561	Germany	DIN