Tuesday, January 4, 2022

303 STAINLESS STEEL UNS 30300

303 Stainless Steel is the most machinable of the austenitic grades of stainless steel. With the addition of Sulfur to this grade, the sulfur enhances the alloy’s machinability which is ordinarily difficult to machine.

Applications: 303 Stainless Steel 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.

Chemistry Analysis

Carbon0.12%Manganese2.00%
Phosphorus0.20%Sulfur0.15%
Silicon1.00%Chromium17.00 – 19.00%
Nickel8.00 – 10.00%Iron67.53 – 71.53%

Corrosion Resistance for 303 Stainless Steel Pipe

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.

Phosphoric acidModerateAcetic AcidModerate
Sodium HydroxideModerateSea WaterRestricted
Salt SprayModerateNitric AcidGood
Sulfuric AcidModerateHumidityExcellent

Typical Elevated Temperature Mechanical Properties

303 Stainless Steel annealed condition 1900f (1038C)

 Short Time Tensile TestsCreep Tests
Test Temperature0.2% Yield StrengthUltimate Tensile Strength% Elongation in 2” (50.8mm)% Reduction in areaStress in 1% Creep in 10,000 Hours
FCksiMpaksiMpaksiMpa
702135241906215055
80042721145614213551
10005381913155379345517117
120054917117453103054748
14007601497302073145214
16008711069201383443

Typical Room Temperature Mechanical Properties 303 Stainless Steel

Annealed 1900f (1038c) 1” rd 303 stainless steel bar

0.2% Yield StrengthUltimate Tensile Strength% Elongation in 2” (50.8mm)% Reduction of AreaBrinell HardnessImpact Strength
ksiMpaksiMpaIzodCharp V-notch
3524190621505516080 ft-lb70 ft-lb

Heat Treatment for 303 SS

Annealing: Heat to 1850/1950 F (1010/1066c) and quench in water. Brinell hardness approximately 160.

Hardening: Cannot be hardened by heat treatment. Cold working this alloy increases its strength and hardness.

Machinability: 303 Stainless Steel machines easily with a brittle chip. Grinding and polishing are possible with 303 Stainless Steel with satisfactory results.

Our forging operation can increase the results for polishing this grade.

Specifications: AMS 5640 ASTM A473 ASTM A582 EN10204 DIN3.1BShapes

Manufactured: Flat Bars, Square Bars, Round Bars, 303 stainless steel flange, 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.

Source: wilsonpipeline.com

For more information on this source please visit: https://www.wilsonpipeline.com .

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