JIS SKH 4A

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Description

JIS JIS SKH 4A Tool Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Steel: JIS SKH 4A

Category	Type	Steel Grade	Standard
Steel Grades	Tool Steel	JIS SKH 4A	JIS
		AFNOR 55 WC 20
		AFNOR 90 MV 8
		AFNOR Z 100 CDV 5
		AFNOR Z 200 C 12
		AFNOR Z 30 WCV 9
		AFNOR Z 38 CDV 5
		AFNOR Z 40 COV 5
		JIS SKD5
		JIS SKD61
		JIS SKD62

Chemical composition(mass fraction)(wt.%) of the JIS SKH 4A

Element	Weight %
C	0.75-0.85
Mn	0.20-0.40
Si	0.20-0.40
Cr	3.75-5.00
Ni	0.3
Mo	0.50-1.25
W	17.50-19.00
V	1.80-2.40
Co	7.00-9.50
Cu	0.25
P	0.03
S	0.03

Mechanical Properties of steel grade JIS SKH 4A

Yield R_p0.2 (MPa)	Tensile R_m (MPa)	Impact KV/Ku (J)	Elongation A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
225 (≥)	647 (≥)	11	32	42	Solution and Aging, Annealing, Ausaging, Q+T,etc	232

Physical Properties of steel grade JIS SKH 4A

Temperature (°C)	Modulus of elasticity (GPa)	Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and	Thermal conductivity (W/m·°C)	Specific thermal capacity (J/kg·°C)	Specific electrical resistivity (Ω mm²/m)	Density (kg/dm³)	Poisson’s coefficient, ν
32	-	-			0.43	-
351	554	-	24.3	314		-
443	-	12	24.2			433	234

Heat Treatment of steel grade JIS SKH 4A

Heat treated : 1988°C - 1142°C

Technological Curves of steel grade JIS SKH 4A

No Curve

Cross Reference Table (Equivalent Grade) of JIS SKH 4A

Grade	Standard	Country	Application
Q195		China	Engineering and welding
Q215		China	Engineering and welding
Q215 B		China	Engineering and welding
Q235		China	Engineering and welding
Q235 B		China	Engineering and welding
Q235 C		China	Engineering and welding
Q235 D		China	Engineering and welding
Q255 A		China	Engineering and welding
Q255 B		China	Engineering and welding
Q275		China	Engineering and welding
Q235q C		China	Bridge structure with steel
Q235q D		China	Bridge structure with steel
Q345q E		China	Bridge structure with steel
Q345q C		China	Bridge structure with steel
ASTM 1030	ASTM	USA	General use carbon steel bar
UNS G10300	UNS	USA	General use carbon steel bar
ASTM 1005	ASTM	USA	General use carbon steel bar
UNS G10050	UNS	USA	General use carbon steel bar
ASTM 1006	ASTM	USA	General use carbon steel bar
UNS G10060	UNS	USA	General use carbon steel bar

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