Stainless Steel 321 Properties

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Stainless Steel 321 Properties

SS 321, also known as UNS S32100, is a titanium-stabilized variant of austenitic stainless steel. It combines the beneficial properties of stainless steel with added resistance to corrosion and oxidation in high-temperature environments. Its composition includes chromium, nickel, and a small amount of titanium, which allows it to perform exceptionally well in extreme conditions. One of the key features of SS 321 is its ability to withstand temperatures up to 900°C (1650°F) while maintaining its structural integrity. This makes it a perfect material choice for applications that are exposed to high-temperature environments, such as the aerospace, chemical processing, and power generation industries. Additionally, its titanium content helps prevent carbide precipitation, which can lead to sensitization and corrosion in stainless steels exposed to high temperatures.

SS 321 stainless steel stands out due to its impressive durability, resistance to high temperatures, and excellent corrosion resistance. At Ferrobend, we are proud to offer premium SS 321 manufacturing solutions tailored to meet the demanding needs of industries that require superior material quality. This article explores the benefits of SS 321 stainless steel, the advantages of choosing Ferrobend for your manufacturing needs, and the versatile applications of SS 321.

At Ferrobend, we specialize in providing high-quality SS 321 manufacturing services that meet the specific needs of our clients. We understand that each project is unique, and we work closely with you to deliver customized stainless steel solutions that are tailored to your exact specifications. Our manufacturing process is built on advanced technology and a commitment to excellence. We use state-of-the-art equipment to ensure precision in every step of production, from cutting and bending to welding and finishing. Our team of experts is dedicated to providing you with the highest standards of workmanship, ensuring that your SS 321 components perform flawlessly in your application.

At Ferrobend, we offer a range of customization options for SS 321, including cutting, shaping, welding, and surface treatments. Whether you need complex, intricate parts or large, bulk orders, we have the capability to meet your exact requirements. Our rigorous quality control processes ensure that every piece of SS 321 manufactured meets the highest standards of excellence. From the raw material stage to the final inspection, we prioritize quality to ensure that our products perform as expected in demanding environments. Ferrobend offers competitive pricing without compromising on quality. We provide cost-effective SS 321 manufacturing solutions that offer long-term value, making us a trusted partner for businesses looking to maximize their return on investment.

Chemical Properties:

Elements Cr Ni C Si Mn P S Mo Fe
% min: 17.0 ,max:19.0 min: 8.0 ,max: 10.0 0.15 max 1.00 max 2.0 max 0.20 max 0.15 min 0.75 balance

Mechanical Properties:

Tensile Strength ksi (min.) Yield Strength 0.2% Offset ksi (min.) Elongation - % in 50 mm (min.) Hardness (Brinell) MAX Hardness (Rockwell B) MAX
75 30 35 228 -

Physical Properties:

Denstiy lbm/in3 Coefficient of Thermal Expansion (min/in)-°F Electrical Resistivity mW-in Thermal Conductivity BTU/hr-ft-°F Melting Range
at 68 °F at 68 – 212°F at 68 – 932°F at 68 – 1450°F at 68°F at 212°F at 392°F at 752°F at 1112°F at 1472°F at 68 – 212°F -
0.29 9.2 10.4 10.9 28.3 30.7 33.8 39.4 43.7 47.6 113.2 2552°F

Equivalent Grades and Designations:

SAE / AISI 303
UNS S30300
EN Material Number 1.4305
EN Material Name X8CrNiS18-9
DIN Material Name X8CrNiS18-9
JIS SUS 303
BS 202S 21 En58M

Heat Resistance:

  • Good oxidation resistance at temperatures up to 1700oF (927 oC)
  • Continuous use at temperatures above 1400oF (760oC) is not usually recommended due to carbide precipitation which can lead to irregular scaling
  • Does not have a low carbon content so it is also vulnerable to sensitization

Welding Characteristics:

  • Not generally recommended, but may be welded with some difficulty
  • May be welded with Alloy 310 electrodes
  • Should be annealed after welding to re-dissolve precipitated carbides

Machinability:

  • High machining rates can be obtained in the annealed condition with hardness in the range of 200 to 240 Brinell
  • Will work harden; therefore, it should be machined at reduced surface feet per minute and heavier feeds to prevent glazing at the tool interface.

Applications:

  • Nuts and bolts
  • Aircraft fittings
  • Gears
  • Screws
  • Shafts
  • Electrical switchgear components
  • Bushings