Stainless Steel 330 Properties

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Stainless Steel 330

Stainless Steel 330, also known as UNS N08330, is an austenitic alloy known for its exceptional resistance to oxidation and carburization at high temperatures. This alloy is composed of chromium, nickel, and iron, providing a robust combination of heat resistance and corrosion resistance. The chromium content enhances its ability to withstand oxidizing environments, while the high nickel content ensures stability and resistance to carburization and nitridation.

Due to its excellent thermal properties, Stainless Steel 330 is widely used in industrial heating applications, such as furnace components, heat exchangers, and gas turbine parts. It performs exceptionally well in high-temperature applications, making it suitable for petrochemical processing, power generation, and thermal processing industries. Additionally, its resistance to thermal shock and creep deformation under prolonged exposure to high temperatures ensures longevity and reliability in demanding environments.

The machinability and weldability of Stainless Steel 330 further enhance its versatility. It can be easily fabricated into complex shapes and components, making it ideal for custom applications requiring precise engineering and manufacturing. Moreover, its resistance to scaling and oxidation at temperatures up to 1150°C (2100°F) makes it a preferred choice for applications involving extreme thermal conditions.

Choosing Stainless Steel 330 for high-temperature and high-stress environments ensures durability and performance, reducing maintenance costs and downtime. Its impressive combination of strength, resistance, and workability makes it a valuable material for industries seeking reliable solutions for challenging applications.

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