General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Alloy 303 (UNS S30300) is an austenitic stainless steel developed for applications requiring extensive machining operations. The alloy has a sulfur addition which assists in breaking up turnings while reducing drag on the cutting tool when compared to the machining characteristics of the conventional 18-8 stainless steels.
303 SS is a free-machining, austenitic stainless steel that is used primarily for parts requiring machining, grinding or polishing. The additional sulfur present in 303 assists in breaking up turnings which reduce drag on the cutting tool. This alloy offers good corrosion resistance in mild environments and good forming properties. It is non-magnetic in the annealed condition, is not hardenable by heat treatment, and can only be hardened by cold working. It is also difficult to weld, and may require filler rods and annealing.
The improved machinability of 303 stainless (UNS S30300) makes it ideal for screw machine applications, aircraft fittings, and fasteners. The additional sulfur that allows this product to be readily machinable also lowers its corrosion resistance compared to a grade like 304. Overall toughness is lower but still good despite the inclusion of sulfur, and is comparable to other austenitic grades of stainless steel. We offer 303 stainless in plate from 0.1875” to 4.000” thicknesses.
Standard Inventory Specifications
- UNS S30300
- AMS 5640 Chem Only
- ASTM A 895
Common Trade Names
- AISI 303
Common Applications of 303
- Aircraft applications including fittings, shafts and spindles
- Automatic screw machine applications
- Medical devices with screw threads, drilled or tapped holes
- Pump and valve parts
- Architectural applications
- Nuts and bolts
Chemical Composition
Chemical Composition of 303 Stainless Steel
Element
Percent by Weight
Mn
Manganese
2.00 maximum
Cr
Chromium
17.0 min – 19.0 max
Ni
Nickel
8.0 min – 10.0 max
C
Carbon
0.15 min
Mn
Manganese
2.00 min
P
Phosphorus
0.20 max
S
Sulfur
0.15 min – 0.35 max
Si
Silicon
1.00 max
Mo
Molybendum
0.60 max
Physical Properties
Physical Properties of 303 Stainless Steel
| Density lb/in? | 0.290 | |
| Density g/cm? | 7.89 | |
| Melting Point | 2552°F | |
| Thermal Conductivity at 212°F (100°C) | 112 BTU/hr/ft²/ft/°F | |
| Thermal Conductivity at 212°F (100°C) | 16.2 W/m-°K | |
| Electrical Resistivity | 28.3 Microhm-in at 68°C | |
| Electrical Resistivity | 72.0 Microhm-cm at 20°C | |
Mechanical Properties
Mechanical Properties 303
303 Seamless Pipe
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: OD: Φ4-Φ1219mm; WT:…
Introduction: Wisine its production capacity of stainless steel seamless pipe, roughly 2100 tons per month. As per your requirement…
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303 Sanitary Tube
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: OD: Φ8-Φ850mm; WT:…
Introduction: Wisine produces sanitary tubes that are widely applicable to food & beverage industry, pharmaceutical industry…
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303 Thick-walled Pipe
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: OD: Φ10-Φ1219mm; WT:…
Introduction: Thick-walled stainless steel pipe, also named stainless steel hollow bar, are usually used for mechanical applications or…
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303 Welded Pipe
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: OD: Φ6-Φ2800mm; WT:…
Introduction: Wisine produces welded stainless steel pipe in different shapes: round, square and rectangle. In comparison with seamless pipe…
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303 Square Pipe
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Side Length: 4×4-300×300mm…
Introduction: As per your requirement, stainless steel square pipe can be made into welded stainless steel square pipe or…
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303 Rectangle Pipe
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Side Length: 4×6-200×400…
Introduction: Stainless steel rectangle pipe is hollow stainless steel long product and can be classified into seamless and welded…
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303 Capillary Tube
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: OD: Φ0.4-Φ16.0mm; WT:…
Introduction: Wisine produces stainless steel capillary with different finishes for your option. Quite common in our international markets…
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303 Coil Tube
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: OD: Φ0.4-Φ16mm; WT:…
Introduction: Stainless steel coil tubes refer to those tubes with diameter ranging from 0.5mm to 20mm and wall thickness from…
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303 Elbow
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Outer Diameter: DN15 – DN600…
Wall Thickness: Sch5S- Sch160…
Classification: 45° elbow, 90° elbow, 180° elbow, long radius elbow, short radius elbow…
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303 Flange
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Outer Diameter: DN6 – DN750…
Wall Thickness: Sch5S-Sch160S…
Classification: SW (Socket Welding) flange, WN (Welding Neck) flange, SO (Slip-On) flange…
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303 Tee
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Outer Diameter: DN15 – DN750…
Wall Thickness: Sch5S-Sch160…
Classification: Straight tee, reducing tee…
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303 Cross
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Outer Diameter: DN15 – DN1200…
Wall Thickness: Sch5S-Sch160…
Classification: Straight cross, reducing cross…
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303 Reducer
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Outer Diameter: DN15 – DN500…
Wall Thickness: Sch5S-Sch160…
Classification: Concentric reducer, eccentric reducer…
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303 Pipe Cap
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Outer Diameter: DN15 – DN1200…
Wall Thickness: Sch5S- Sch160…
Classification: Hemispherical cap, elliptical/oval cap, dish cap, spherical cap…
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303 Round Bar
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Diameter: 2mm – 600mm…
Introduction: Stainless steel round bars are categorized as both long products and bar materials. SS round bar is long stainless steel product…
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303 Flat Bar
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Thickness: 0.5mm – 200mm…
Introduction: Stainless steel flat bars are of rectangle shape with root face (or round edges) and they can be semi-finished or finished…
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303 Angle Bar
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Equal Angle Bar Dimensions…
Introduction: Stainless steel angle bars are L-shape bars with two side widths perpendicular to each other. The two widths can be equal…
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303 Square Bar
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Dimensions: 2mmx2mm – …
Introduction: Stainless steel square bars are long stainless steel products with its cross section as square. At Wisine, we produce SS square…
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303 Hexagon Bar
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Dimension: 3mm – 180mm…
Introduction: Stainless steel hex bar is solid stainless steel long product with its cross section as hexagonal. Wisine produce stainless…
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303 Channel Bar
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Hot Rolled: 40mmx80mmx…
Introduction: Stainless steel channel bar is stainless steel long product with its section as U shape. At Wisine, apart from stainless steel…
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303 Sheet
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Thickness: ≤ 5mm…
Introduction: In Wisine, we refer to thickness below 5mm as stainless steel sheets and thickness above 5mm as SS plates…
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303 Plate
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Thickness: ≥ 5mm…
Introduction: In Wisine, we regard thickness above (includes) 5mm as stainless steel plates. Our stainless steel plates are hot rolled…
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303 Coil
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Width: ≥ 610mm…
Introduction: Our stainless steel coils are primary quality coils from the origin of Baosteel, ZPSS, TISCO, JISCO, ATI, SMC, HAYNES…
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303 Strip
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Width: ≤ 610mm…
Introduction: Stainless steel strip has its width less than 610mm, with its thickness ranging from 0.02mm to 6mm. For width over 610mm…
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303 Wire
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Diameter: 0.02mm-25mm…
Introduction: Wisine produces high quality wire and stainless steel wire rope. Our annual production capacity is roughly 8000 tons…
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303 Wire Rod
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Diameter: Hot rolled wire rod:…
Weight: ≤500Kg per roll
Tolerance: H9, H11
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303 Wire Rope
Standard: ASTM, JIS, DIN, EU…
Grade: 303…
Size: Φ0.15mm-Φ50mm…
Introduction: Wisine produces high quality wire and stainless steel wire rope. Our annual production capacity is roughly 8000 tons…
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