AISI 4340 Steel, oil quenched 830°C (1525°F), 540°C (1000°F) temper, nitrided

Login to see your most recently viewed materials here. Or if you don't have an account with us yet, then click here to register.

AISI 4340 Steel, oil quenched 830°C (1525°F), 540°C (1000°F) temper, nitrided
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Specimens nitrided at 525°C for 48 hrs. Normalized at 940 - 955°C. AISI 4340 has a favorable response to heat treatment (usually oil quenching followed by tempering) and exhibits a good combination of ductility and strength when treated thusly. Uses include piston pins, bearings, ordnance, gears, dies, and pressure vessels.
Key Words:	alloy steels, UNS G43400, AMS 5331, AMS 6359, AMS 6414, AMS 6415, ASTM A322, ASTM A331, ASTM A505, ASTM A519, ASTM A547, ASTM A646, MIL SPEC MIL-S-16974, B.S. 817 M 40 (UK), SAE J404, SAE J412, SAE J770, DIN 1.6565, JIS SNCM 8, IS 1570 40Ni2Cr1Mo28, IS 1570 40NiCr1Mo15
Vendors:	No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
Printer friendly version Download as PDF Download to Excel (requires Excel and Windows) Export data to your CAD/FEA program Add to Folder:

Physical Properties	Metric	English	Comments

Density	7.85 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	335	335	Converted from Rockwell C hardness.
Hardness, Rockwell C	33	33	core hardness
Hardness, Vickers	323	323	Converted from Rockwell C hardness.
Modulus of Elasticity	200 GPa	29000 ksi
Bulk Modulus	159 GPa	23100 ksi	Estimated from elastic modulus
Poissons Ratio	0.29	0.29	Typical for steel
Fatigue Strength	350 MPa @# of Cycles >=1.60e+9	50800 psi @# of Cycles >=1.60e+9	Notched; Nitrided samples have no true limit; R.R. Moore rotating beam fatigue specimens with min. diameter of 5.84 mm; 45°, 0.25 mm root-radius notch 0.51 mm deep.
	595 MPa @Diameter >=5.84 mm, # of Cycles 3.50e+8	86300 psi @Diameter >=0.230 in, # of Cycles 3.50e+8	Smooth; Nitrided samples have no true limit; R.R. Moore rotating beam specimens
Machinability	50 %	50 %	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	78.0 GPa	11300 ksi	Estimated from elastic modulus

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000248 ohm-cm @Temperature 20.0 °C	0.0000248 ohm-cm @Temperature 68.0 °F
	0.0000298 ohm-cm @Temperature 100 °C	0.0000298 ohm-cm @Temperature 212 °F
	0.0000552 ohm-cm @Temperature 400 °C	0.0000552 ohm-cm @Temperature 752 °F
	0.0000797 ohm-cm @Temperature 600 °C	0.0000797 ohm-cm @Temperature 1110 °F

Thermal Properties	Metric	English	Comments
CTE, linear	12.3 µm/m-°C @Temperature 20.0 °C	6.83 µin/in-°F @Temperature 68.0 °F	specimen oil hardened, 600°C (1110°F) temper
	12.6 µm/m-°C @Temperature 21.0 - 260 °C	7.00 µin/in-°F @Temperature 69.8 - 500 °F	1.88% Ni, normalized and tempered
	12.7 µm/m-°C @Temperature 20.0 °C	7.06 µin/in-°F @Temperature 68.0 °F	specimen oil hardened, 600°C (1110°F) temper
	13.7 µm/m-°C @Temperature 250 °C	7.61 µin/in-°F @Temperature 482 °F	specimen oil hardened, 600°C (1110°F) temper
	13.7 µm/m-°C @Temperature 21.0 - 540 °C	7.61 µin/in-°F @Temperature 69.8 - 1000 °F	1.88% Ni, normalized and tempered
	13.9 µm/m-°C @Temperature 21.0 - 540 °C	7.72 µin/in-°F @Temperature 69.8 - 1000 °F	1.90% Ni, quenched, tempered
	14.5 µm/m-°C @Temperature 500 °C	8.06 µin/in-°F @Temperature 932 °F	specimen oil hardened, 600°C (1110°F) temper
Specific Heat Capacity	0.475 J/g-°C	0.114 BTU/lb-°F	Typical 4000 series steel
Thermal Conductivity	44.5 W/m-K	309 BTU-in/hr-ft²-°F	Typical steel

Component Elements Properties	Metric	English	Comments
Carbon, C	0.37 - 0.43 %	0.37 - 0.43 %
Chromium, Cr	0.70 - 0.90 %	0.70 - 0.90 %
Iron, Fe	95.195 - 96.33 %	95.195 - 96.33 %	As remainder
Manganese, Mn	0.60 - 0.80 %	0.60 - 0.80 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	1.65 - 2.0 %	1.65 - 2.0 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.30 %	0.15 - 0.30 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

Users viewing this material also viewed the following:
AISI 4340 Steel, oil quenched 845°C, 650°C (1200°F) temper
AISI 4340 Steel, oil quenched 845°C, 425°C (800°F) temper
AISI 4340 Steel, oil quenched 855°C (1570°F), 230°C (450°F) temper for 4 hrs.
AISI 4340 Steel, oil quenched 800°C (1470°F), 650°C (1200°F) temper, 100 mm
AISI 4340 Steel, oil quenched 830°C (1525°F), 540°C (1000°F) temper, not nitrided

M434BB / 7778

	Advertise with MatWeb!
	Data sheets for over 180,000 metals, plastics, ceramics, and composites.
	HOME • SEARCH • TOOLS • SUPPLIERS • FOLDERS • ABOUT US • FAQ • LOG IN

System Message