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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
