303 Stainless Steel Forgings UNS 30300

303 Stainless Steel is the most machinable of the austenitic grades of stainless steel, which makes this material perfect for the open die forging process. With the addition of sulfur to this grade, the sulfur enhances the alloy 303’s machinability which is ordinarily difficult to machine. We can forge and machine your 303 stainless steel into to flat, square and round bars, seamless rolled rings, hollows, discs, blocks, hubs, special shapes and more.

Forging Applications: Forged 303 stainless is widely used in manufacture of shafts, valve bodies, valve trim and food industry applications where 304 stainless would be normally used. 303 Stainless steel properties make it resistant to atmospheric corrosion, food products, sterilization solutions and many organic chemicals as well as a variety of inorganic chemicals.

Call Anderson Shumaker, the industry’s best in stainless 303 forgings, today to speak with one of our forgings specialists!

Chemistry Analysis

Carbon 0.12% Manganese 2.00%
Phosphorus 0.20% Sulfur 0.15%
Silicon 1.00% Chromium 17.00 – 19.00%
Nickel 8.00 – 10.00% Iron 67.53 – 71.53%
Phosphoric acid Moderate Acetic Acid Moderate
Sodium Hydroxide Moderate Sea Water Restricted
Salt Spray Moderate Nitric Acid Good
Sulfuric Acid Moderate Humidity Excellent

Corrosion Resistance for 303 Stainless

Intergranular corrosion may be compromised if the 303 stainless steel material is heated between 800 degrees F (427 c) and 1650 F (899 C) or cooled slowly through that range.

The following table is for reference only, many factors can affect the corrosive resistance. A corrosion test for each application should be applied.

Typical Elevated Temperature Mechanical Properties

303 Stainless annealed condition 1900f (1038C)

Short Time Tensile Tests Creep Tests
Test Temperature 0.2% Yield Strength Ultimate Tensile Strength % Elongation in 2” (50.8mm) % Reduction in area Stress in 1% Creep in 10,000 Hours
F C ksi Mpa ksi Mpa ksi Mpa
70 21 35 241 90 621 50 55
800 427 21 145 61 421 35 51
1000 538 19 131 55 379 34 55 17 117
1200 549 17 117 45 310 30 54 7 48
1400 760 14 97 30 207 31 45 2 14
1600 871 10 69 20 138 34 43

Typical Room Temperature Mechanical Properties 303 Stainless

Annealed 1900f (1038c) 1” rd bar
0.2% Yield Strength Ultimate Tensile Strength % Elongation in 2” (50.8mm) % Reduction of Area Brinell Hardness Impact Strength
ksi Mpa ksi Mpa Izod Charp V-notch
35 241 90 621 50 55 160 80 ft-lb 70 ft-lb
Heat Treatment for 303 SS
Heat to 1850/1950 F (1010/1066c) and quench in water. Brinell hardness approximately 160.
Cannot be hardened by heat treatment. Cold working this alloy increases its strength and hardness.
303 Stainless Steel machines easily with a brittle chip. Grinding and polishing are possible with 303 Stainless with satisfactory results. Our forging operation can increase the results for polishing this grade.
AMS 5640 ASTM A473 ASTM A582 EN10204 DIN3.1B
Shapes Manufactured:
Flat Bars, Square Bars, Round Bars, Forged Rings, Hollows, Discs, Blocks and special Shapes. Send us a drawing to see how we can save you material and machining time!

The information in this data sheet is for information only and should not be used for engineering.

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