Stainless Steel 329 Properties

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Stainless Steel 329

Stainless Steel 329, also known by its UNS S32900 designation, is a high-performance duplex stainless steel that offers an excellent combination of austenitic and ferritic phases. This unique composition provides exceptional strength, toughness, and resistance to corrosion, making it ideal for demanding industrial applications. The alloy's high chromium and molybdenum content significantly enhances its ability to withstand pitting, crevice corrosion, and stress corrosion cracking, especially in aggressive environments.

Ferrobend's Stainless Steel 329 is meticulously manufactured to adhere to the highest quality standards, ensuring reliable performance across various industries. This material is particularly well-suited for marine environments, chemical processing plants, and the oil and gas sector due to its outstanding resistance to chloride-induced stress corrosion and excellent mechanical properties. The balance of austenitic and ferritic phases allows for superior durability, even in the most challenging conditions.

Stainless Steel 329 also exhibits excellent weldability and formability, making it easy to fabricate into complex shapes and components. This versatility caters to a wide range of engineering applications, including pressure vessels, heat exchangers, and structural components. The alloy's ability to maintain structural integrity and resist deformation at elevated temperatures further enhances its suitability for high-temperature environments, ensuring long-lasting performance and reliability.

Choosing Ferrobend's Stainless Steel 329 guarantees a durable and robust solution for your industrial needs. Our commitment to quality and customer satisfaction ensures that you receive materials that perform exceptionally well, reducing maintenance costs and downtime. With Ferrobend, you can trust that our stainless steel products will deliver long-lasting performance and reliability in even the most demanding environments.

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