303 Stainless Steel
303 Stainless Steel is the most readily machineable of all the austenitic grades of stainless steel.
Type 303 is a type of steel used in applications that require parts to be heavily machined while maintaining good mechanical and corrosion resistant properties, demonstrating excellent toughness. Applications include; nuts and bolts, gears, shafts, aircraft fittings etc.
Contact us for the best prices for Type 303.
303 Stainless Steel Bar Grinding Services
- Austenitic Stainless Steel
- Excellent machining characteristics
- Free machining version of Types 302 and 304 is used for parts requiring extensive machining
- Annealed condition is non-magnetic
- Type 303 is slightly magnetic when cold worked
- Good corrosion resistance
- Good oxidation resistance up to 1700 degrees F
Specifications
303 stainless steel is covered by the following specifications:
- AMS 564OG
- ASTM A314-63
- ASTM A320-65
- ASTM 581-67
- ASTM 582-67
- QQ-S-764A
- MIL-S-862B
Composition & Properties
Properties
Type 303%
Carbon
.15 max
Manganese
2.00 max
Phosphorus
.20 max
Sulfur
.15 min
Selenium
NA
Silicon
1.00 max
Chromium
17.00 – 19.00
Nickel
8.00 – 10.00
Molybdenum
.60 max
Typical Mechanical Properties Annealed
Ultimate Tensile Strength, psi
90,000
.20% Yield strength psi
35,000
Elongation, % in 2″
B83
Reduction of area, %
55
Standard Heat Treatments
- Anneal: Heat to 1900 – 2050 F and water quench
- Harden: Type 303 cannot be hardened by heat treatment
Formability
- Grade 303 Stainless Steel has limited formability because of its sulfur content
Machinability
- Excellent machinability
Forging 303 Stainless Steel
- Type 303 should be heated slowly to 2000-2150 F
- Soaked for a sufficient time, then raised to 2200 – 3250 F
- Should not be forged below 1700 F
Corrosion Resistance
- Excellent corrosion resistance
- Effectively resist attack in atmospheric exposures, sterilizing solutions, most organic and many inorganic chemicals, most dyes nitric acid and foods
- For best corrosion resistance finished parts should be free from scale and foreign particles
Welding 303 Stainless Steel
- Only fair weldability
- Can be welded using proper procedures
- Weldability can be improved by using methods that minimize dilution of the weld metal with the melted base metal
- Reducing the time that welds are in the hot-short temperature range and use of Type 312 (29-9) filler metal helps obtain satisfactory results
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