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304/304L Prodec Stainless

Penn Stainless inventory includes Prodec 304/304L (UNS S30400 / S30403) in stainless steel plate products.


General Properties

Prodec Alloy 304/304L is an improved version of standard 304/304L processed for improved machinability and outstanding uniformity. This alloy offers faster machining speeds, longer tool life, improved part quality and lower total cost of machined parts. Prodec 304/304L is nonmagnetic in the annealed condition, but may become slightly magnetic as a result of cold working or welding.

SpecificationsUNS S30400, UNS S30403


Prodec 304/304L Stainless Steel is used in a wide variety of home and commercial applications, including:

  • Chemical process equipment
  • Food and beverage industry


  • ASTM/ASME:  UNS S30400 / S30403
  • EURONORM: 1.4301 / 1.4307

Corrosion Resistance:

  • Prodec 304/304L is a versatile, general purpose stainless steel with good resistance to atmospheric corrosion, to many organic and inorganic chemicals, and to food and beverages.
  • It has also been used in vacuum processing equipment and specialized instruments where high integrity is essential.

Heat Resistance:

  • Good oxidation resistance in intermittent service to 1600°F and in continuous service to 1690°F.
  • Continuous use of 304 in the 800-1580°F range is not recommended if subsequent aqueous corrosion resistance is important.

Properties of 304 Alloy

Welding Characteristics:

  • readily welded by full range of conventional welding procedures except oxyacetylene.
  • AWS E308L/ ER308L filler metal should be used with Prodec 304/304L steel.



  • offers faster machining speeds, longer tool life, improved part quality and lower total cost of machined parts.

Chemical Properties

Cr Ni C Mn P S Si Fe
MIN 18.0 8.0 - - - 0.015 - -
MAX 20.0 11.0 0.03 2.0 0.045 0.03 0.75 Balance

Mechanical Properties

Typical ASTM
Tensile Strength, ksi ksi 85 75
Yield Strength, ksi ksi 35 30
Elonation in 2 inches, % % 60 40
Reduction of area, % % 70 -
Hardness, HB HB 160 201

Physical Properties

Thermal Conductivity
(BTU/h ft. °F)
(in x 10-6)
Modulus of
(psi x 106
Coefficient of
Thermal Expansion
°F x 10-6
Specific Heat
at 68°F: 0.285 8.7 at 212°F 27.6 at 68°F 29 9.4 at 32 – 212°F 0.1200 at 68°F to 212°F 2500 to 2590
10.2 at 32 – 1000°F
10.4 at 32 – 1500°F

Alloy 304/304L PDF