Crucible Steel 174 SXR Precipitation Hardening Stainless Steel

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Crucible Steel 174 SXR Precipitation Hardening Stainless Steel
Categories:	Metal; Ferrous Metal; Stainless Steel; Precipitation Hardening Stainless
Material Notes:	Crucible 174 SXR is a premium quality precipitation- hardening stainless steel designed for use as rifle barrels. It is a modification of Crucible’s 17Cr-4Ni which offers substantially improved machinability without sacrificing toughness. Its excellent corrosion resistance approaches that of a 300 series austenitic stainless steel, while its high strength is characteristic of 400 series martensitic stainless steels. At similar hardness levels, Crucible 174 SXR offers greater toughness than either the 410 or the 416 stainless steels which are commonly used for rifle barrels. Information provided by Crucible Industries
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Mechanical Properties	Original Value	Comments

Hardness, Rockwell C	33 @Treatment Temp. 621 °C	hardened H1150
	36 @Treatment Temp. 579.4 °C	hardened H1025
	38 @Treatment Temp. 551.7 °C	hardened H1025
Charpy Impact	40.0 ft-lb @Treatment Temp. 551.7 °C	hardened H1025; V-notch
	43.0 ft-lb @Treatment Temp. 579.4 °C	hardened H1025; V-notch
	100 ft-lb @Treatment Temp. 621 °C	hardened H1150; V-notch

Component Elements Properties	Original Value	Comments
Carbon, C	0.020 %
Chromium, Cr	15.25 %
Copper, Cu	3.5 %
Iron, Fe	75 %	as balance
Manganese, Mn	0.60 %
Nickel, Ni	4.8 %
Niobium, Nb (Columbium, Cb)	0.20 %
Nitrogen, N	0.015 %
Phosphorus, P	0.025 %
Silicon, Si	0.50 %
Sulfur, S	0.020 %

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NCRUC944 / 160395

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