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All Categories > Aluminum and Stainless Bars, Tubes, Pipes and Plates > Stainless Steel > Hot Rolled Stainless Steel > 303Se - Hot Rolled Stainless Steel > Types 303Se Hot Rolled, Annealed and Pickled Stainless Steel - Squares > Size 2 3/4  
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Size 2 3/4, Types 303Se Hot Rolled, Annealed and Pickled Stainless Steel - Squares

Type 303 is "18-8" chromium-nickel stainless steel modified by the addition of selenium or sulphur, as well as phosphorus, to improve machinability and non- seizing properties. It is the most readily machinable of all the chromium-nickel arades and has good corrosion resistance It is non-magnetic in the annealed condition and not hardenable by heat treatment. Tensile strength and hardness can be increased by cold working. It is manufactured by the electric-furnace process and meets the exacting requirements of the aircraft industry.

UNS S30300. S30323

Color Marking

Type 303Se
Annealed Bars: Ends painted Purple
High Tensile Bars (Condition B): Ends painted Brown

Stock Lengths 10' to 12'

Max. Brinell 235

Specifications  · Analysis  · Specifications  · Applications  · Corrosion Resistance  · Resistance to Scaling  · Mechanical Properties  · Machinability  · Weldability  · Forming  · Forging  · Annealing


Estimated Weight per Foot

25.74 lb

Estimated Weight 12-Ft. Bar

308.8 lb

Carbon .15 Max.
Manganese 2.00 Max.
Phosphorus .17 Max.
Sulphur .04 Max.
Se. .15/.40
Si. 1.00 Max.
Ni. 8.00/10.00
Mo. .75 Max.
Cu. .75 Max.

The following specifications are generally applicable:
AMS 5640, ASTM A 314, ASTM A 320, ASTM A 582

Used almost exclusively for parts requiring machining, grinding, or polishing where good corrosion resistance is also required. Its non-seizing and non-galling properties make it ideal for moving parts. Being an austenitic steel, it is useful where low magnetic permeability is desired.

Corrosion Resistance
Because of the elements which are added to improve machinability, Type 303 has slightly less general corrosion resistance than the regular chromium-nickel grades such as Type 302. Maximum corrosion resistance is obtained in the annealed condition.

Resistance to Scaling
This grade has excellent scale resistance at temperatures up to 1600°F in continuous service. Like other chromium-nickel grades, it has a high coefficient of expansion which should be considered in designing.

Mechanical Properties
Cond. A (Annealed)
1/2" and under
Tensile Strength - 125.000 psi Max.
Brinell Hardness 140/255
over 1/2"
Brinell Hardness 140/255

Cond. B (High Tensile)
up to 3/4"
Tensile Strength - 125.00 psi Min.
Yield Strength - 100,000 psi Min.
Elongation in 2" - 12% Min.
Reduction of Area 35% Min.
Brinell Hardness 321 Max.
Over 3/4" to 1"
Tensile Strength - 115.00 psi Min.
Yield Strength - 80,000 psi Min.
Elongation in 2" - 15% Min.
Reduction of Area 35% Min.
Brinell Hardness 321 Max.
Over 1" to 1 1/4"
Tensile Strength - 105.00 psi Min.
Yield Strength - 65,000 psi Min.
Elongation in 2" - 20% Min.
Reduction of Area 35% Min.
Brinell Hardness 321 Max.
Over 1 1/4" to 1 1/2"
Tensile Strength - 100.00 psi Min.
Yield Strength - 50,000 psi Min.
Elongation in 2" - 28% Min.
Reduction of Area 45% Min.
Brinell Hardness 321 Max.
Over 1 1/2" to 3"
Tensile Strength - 95.00 psi Min.
Yield Strength - 45,000 psi Min.
Elongation in 2" - 28% Min.
Reduction of Area 45% Min.
Brinell Hardness 321 Max.

In practice, annealed bars will average as follows:
H.R. Ann
Tensile Strength - 90.00 psi
Yield Strength - 35,000 psi
Elongation in 2" - 50% Min.
Reduction of Area 55% Min.
Izod Impact Ft. Lbs.80%
Brinell Hardness 160 Max.

Ann. & C. F
Tensile Strength - 100.00 psi
Yield Strength - 60,000 psi
Elongation in 2" - 40% Min.
Reduction of Area 53% Min.
IBrinell Hardness 228 Max.

Type 303 has considerably better machining characteristics than the other chromium-nickel grades. It has machinability rating of approximately 78% with 1212 rated 100%. Surface cutting speed on automatic screw machines is approximately 130 feet per minute.

This grade has only fair welding properties.

This'grade has fairly good forming properties.

Forge between 2100° and 2350°F. Do not forge below 1700°F

Annealing range is between 1850° and 2050°F. Cool rapidly. Water should be used for heavier sections; air for lighter sections. The stress relieving range is between 400° and 750 °F.

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