United States · SAE

17-22-A

SAE AMS 6304L:2012 — Low-Alloy Steel,Heat-Resistant,Bars,Forgings,and Tubing 0.95Cr. 0.55Mo. 0.30V (0.40. 0.50C) UNS K14675

Chemical composition

Element	min	max	Similar	Remarks
C	0.4	0.5
Cr	0.8	1.1
Cu		0.35
Mn	0.4	0.7
Mo	0.45	0.65
Ni		0.25
P		0.025
S		0.025
Si	0.15	0.35
V	0.25	0.35

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
+CF						HR ≤25 HRC
annealed						HR ≤99 Hardened 1038℃
bars, , d < 12.7 mm		≤862
bars, , d > 12.7 mm						HB ≤248
bars, annealed, d > 12.7 mm						HB ≤229
forgings, annealed						HB ≤248

Physical properties

Temperature

20.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
					7.83	0.30

21.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
212.36

427.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	13.79

538.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
177.88	14.04	32.74

649.0

Elastic modulus	Mean thermal expansion	Thermal conductivity	Specific heat	Resistivity	Density	Poisson's ratio
	14.27

Typical physical values

Density	Elastic modulus	Poisson's ratio	Remarks
7.72–8.00	190.00–210.00	0.27–0.30	典型属性数值，工具钢。此值不来源于标准，它是指示性指标，不能被用于设计用途。
7.85	200.00–207.00	0.27–0.30	低碳钢低合金钢的材料性能属性数值，此值不来源于标准，它是指示性指标，不能被用于设计用途。

Creep

Temperature ℃	Time h	CRS
427	100.0h	579.16
427	1000.0h	496.42
538	100.0h	337.84
538	1000.0h	248.21

Similar grades

Grade	Region	System
17-22-A	United States	AMS