UNI 38 CrMo 4

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#UNI # #38

Description

UNI UNI 38 CrMo 4 Alloy Steel and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Alloy Steel: UNI 38 CrMo 4

Category	Type	Steel Grade	Standard
Steel Grades	Alloy Steel	UNI 38 CrMo 4	UNI
		UNI 20 NiCrMo
		UNI 25 CrMo 4
		UNI 25 CrMo 4 KB
		UNI 30 NiCrMo 2 KB
		UNI 34 Cr 4 KB
		UNI 34 CrMo 4 KB
		UNI 35 CrMo 4
		UNI 35 CrMo 4 F
		UNI 38 Cr 4 KB
		UNI 38 CrB 1 KB

Chemical composition(mass fraction)(wt.%) of the UNI 38 CrMo 4

Element	Weight %
C	0.39-0.46
Mn	0.65-1.10
Cr	0.75-1.20
Mo	0.15-0.25
P	0.035
S	0.040
Si	0.15-0.30

Mechanical Properties of steel grade UNI 38 CrMo 4

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)
223 (≥)	536 (≥)	33	41	14	Solution and Aging, Annealing, Ausaging, Q+T,etc	343

Physical Properties of steel grade UNI 38 CrMo 4

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
42	-	-			0.14	-
262	886	-	44.3	323		-
914	-	34	42.2			322	214

Heat Treatment of steel grade UNI 38 CrMo 4

Heat treated : 1275°C - 1782°C

Technological Curves of steel grade UNI 38 CrMo 4

No Curve

Cross Reference Table (Equivalent Grade) of UNI 38 CrMo 4

Grade	Standard	Country	Application
UnitempAF2-1		USA	Martensitic special steel
UnitempHS	AISI	USA	Martensitic special steel
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

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