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Stainless Steel 303 / Alloy 303Se / Alloy 303 Sulf

Technical Data Sheet

Stainless Steel 303 is a free machining stainless steel. Due to the addition of sulfur this 18-8 chrome nickel stainless steel has enhanced machinability where before it was tough and difficult to machine. Stainless Steel 303 is widely used in the screw machine industry, as well as for use in shafts, valves and fittings. Stainless Steel 303 is not recommended for vessels containing gases or liquids under high pressure.

Chemical Composition Limits
Weight%	C	Mn	Si	P	S	Cr	Ni	Mo	Se	Cu
Alloy 303 Se AMS 5640 Ty 2	0.15 max	2 max	1 max	0.12-0.17	0.04 max	17-18	8-10	1 max	0.15 - 0.40	1.00 max
Alloy 303 Sulf AMS 5640 Ty1	0.15 max	2 max	1 max	0.15 max	0.15 min	17-19	8-10	1 max	-	1 max

Typical Mechanical Properties

Alloy	Ultimate Tensile Strength (ksi)	Yield Strength 0.2% (ksi)	Elongation 2" (%)	Reduction of Area (%)	Brinell Hardness
Alloy 303	90	35	50	55	160
Typical Properties for 1" diameter round bar, annealed 1900°F

Availability
Alloy 303 (Stainless Steel) is available in Bar (Round, Flats, Hexagon, Squares), Plate, Wire. View stock list for further information Plate Stock List. For all other stock availability contact Sales.

Specifications
AMS 5635 303Pb Bar / forging
AMS 5638 Bar / wire / forging
AMS 5640 Type 1 303Sulf Bar
AMS 5640 Type 2 303Se Bar
AMS 5641 303Se Free machine Bar
ASM 5738 Free mach, High yield str
MIL-S-7720
MIL-W-52263
QQ-S-763
QQ-S-764
ASTM A320 Grade B8F Cl1
ASTM A320 Grade B8F Cl2
ASTM A484 / ASME SA484
ASTM A582 /ASME SA582
AISI 303
BS 970; 303S21
BS 970; 303S41
EN58AM
WS 1.4305
X8CrNiS18-9
AFNOR Z10CNF18-09

For more information about Alloy 303 for use in medical applications, visit our medical division at www.ammedicalalloys.com

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.