Crucible Steel Nitriding #135 Modified Steel, AISI 4140 Modified

Category	Metal , Ferrous Metal , Alloy Steel , AISI 4000 Series Steel
Manufacturer	Crucible Steel
Trade Name
Port	Shanghai port,China
Trade Terms	FOB, CFR, CIF
Payment Terms	L/C, T/T, Western Union
Download PDF	Crucible Steel Nitriding #135 Modified Steel, AISI 4140 Modified.pdf
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Material Notes:

Nitriding #135 steel is a modification of AISI 4140 specifically designed to be nitrided for high surface hardness and abrasion resistance.Information provided by Crucible Industries

Physical Properties	Metric	English	Comments
Density	7.75 g/cc	0.280 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	28 - 30	28 - 30
Hardness, Rockwell HR30N	86	86	at surface
	62 @Thickness 0.508 mm	62 @Thickness 0.0200 in
	70 @Thickness 0.381 mm	70 @Thickness 0.0150 in
	82 @Thickness 0.254 mm	82 @Thickness 0.0100 in
	84 @Thickness 0.203 mm	84 @Thickness 0.00800 in
	86 @Thickness 0.127 mm	86 @Thickness 0.00500 in
	87 @Thickness 0.0762 mm	87 @Thickness 0.00300 in
Hardness, Vickers	1110	1110	at surface
	420 @Thickness 0.508 mm	420 @Thickness 0.0200 in
	600 @Thickness 0.381 mm	600 @Thickness 0.0150 in
	950 @Thickness 0.254 mm	950 @Thickness 0.0100 in
	1040 @Thickness 0.203 mm	1040 @Thickness 0.00800 in
	1120 @Thickness 0.127 mm	1120 @Thickness 0.00500 in
	1140 @Thickness 0.0762 mm	1140 @Thickness 0.00300 in
Modulus of Elasticity	207 GPa	30000 ksi

Thermal Properties	Metric	English
CTE, linear	12.6 µm/m-°C @Temperature 21.1 - 121 °C	7.00 µin/in-°F @Temperature 70.0 - 250 °F
	12.8 µm/m-°C @Temperature 21.1 - 204 °C	7.10 µin/in-°F @Temperature 70.0 - 400 °F
	13.0 µm/m-°C @Temperature 21.1 - 427 °C	7.25 µin/in-°F @Temperature 70.0 - 800 °F
Thermal Conductivity	3.46 W/m-K @Temperature 93.3 °C	24.0 BTU-in/hr-ft²-°F @Temperature 200 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	1.15 %	1.15 %
Carbon, C	0.40 %	0.40 %
Chromium, Cr	1.6 %	1.6 %
Iron, Fe	95.6 %	95.6 %	as balance
Manganese, Mn	0.60 %	0.60 %
Molybdenum, Mo	0.35 %	0.35 %
Silicon, Si	0.30 %	0.30 %

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