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      Triad Bellows offers custom material and alloy selection to meet the unique demands of your application, ensuring each metal bellows assembly is optimized for performance, durability, and compatibility. Whether you’re dealing with high temperatures, corrosive media, or extreme pressure conditions, Triad’s engineering team will help select the ideal material—ranging from standard T-321 and T-316 stainless steel to high-performance alloys such as Inconel®, Hastelloy®, Monel®, or Alloy X. This flexibility allows fabricators, OEMs, and end-users to tailor each bellows to specific chemical, thermal, or mechanical environments. With every bellows built to EJMA 10th Edition standards, Triad ensures your custom alloy selection is integrated without compromise—delivering long cycle life, superior weld integrity, and unmatched reliability in the field. Whether you require enhanced corrosion resistance, higher fatigue strength, or specialized metallurgical properties, Triad Bellows provides expert guidance and fast, precision fabrication to match your material needs.

      Alloys Used in Bellows and Light Accessories Forming

      Listed below are some of the materials we use for creating both our standard and custom metal bellows and expansion joints. Depending on the intended function of the product, we use different alloys that can resist different temperatures, avoid corrosion cracking, and more. Both our stainless steel bellows and expansion joints are crafted from superior materials to give you the quality you deserve. If you have any questions or concerns about our manufacturing process or the materials used in our metal bellows, Triad Bellows’ experts are here to help. Please give us a call today.

      ASTM A240 T-321

      Heat resistant alloy for bellows limited to 1200º F
      Titanium stabilized grade of 300 series stainless steel
      Optimum resistance to inter-granular corrosion and stress corrosion cracking

      ASTM A240 T-304/304L

      Heat resistant alloy for bellows limited to 1200º F
      Titanium stabilized grade of 300 series stainless steel
      Optimum resistance to inter-granular corrosion and stress corrosion cracking

      ASTM A240 T-316/316L

      Applied to temperatures up to 1000ºF
      Offered in dual certification
      Provides excellent corrosion resistance
      Alloy stabilized with molybdenum

      ASTM A240 T-310

      Temperature range up to 1500ºF
      Austenitic heat resistance alloy
      Excellent resistance to oxidation
      Limited availability in bellows material thickness

      ASTM B-536 ALLOY 330

      Recommended up to 1500ºF
      High nickel alloy
      Combination of strength and resistance to carburization
      Resistant to oxidation and thermal shock

      ASTM B-168 ALLOY 600
      Inconel 600

      Operates at elevated temperatures up to 1200ºF
      High nickel alloy with great carburization and oxidation resistance
      Resistant to chlorides, dry and gaseous at elevated temperatures
      Not recommended for use in extreme heat where sulfur is present

      ASTM B-443 ALLOY 625
      Inconel 625

      Temperature resistant up to 1200ºF
      High nickel alloy with outstanding strength
      Aqueous corrosion resistance due to content of molybdenum and columbium

      ASTM B-435 ALLOY X
      Hastelloy X

      Recommended for temperatures up to 1500ºF
      High nickel alloy grade with excellent strength
      Oxidation resistant

      ASTM B-575 ALLOY C-276
      Hastelloy C-276

      Temperature limited to 1200ºF
      High nickel molybdenum and chromium alloy with traces of tungsten
      Excellent resistance to pitting and stress corrosion cracking
      Used for heat exchangers, ducting and marine applications
      Alloys Used for Hardware with Expansion Joint Manufacturing

      ASTM A-36

      Carbon based steel plate used for plate flanges, tie rod ears, and gussets in temperatures up to 750ºF

      ASTM A-516 GR.70

      Stronger alloy steel plate with better properties than A-36 plate
      flanges and hardware up to 1000ºF

      ASTM A-240
      T-304, T-316, T-321

      Stainless steel plate used for special plate flanges, gimbal hardware, etc. up to 1000ºF

      ASTM A-53-E GR.B

      Carbon based steel pipe, welded and spot radiograph checked on the seam weld rated to 750ºF

      ASTM A106 GR.B

      Higher grade carbon steel pipe, seamless provides weld efficiency of 100% radiographed seam rated to 750ºF

      ASTM A-105

      Forged steel RFSO flanges, couplings, temperature and pressure rating varies

      ASTM A-234 GR WPB

      Pipe elbows, concentric reducers, and other non-forged carbon steel fittings

      ASTM A182 F GRADES
      304/304L, 316/316L

      Basic stainless steel forging, covers RFSO flanges couplings, temperature and pressure rating varies

      ASTM A-312 GRADES
      304/304L, 316/316L

      Covers stainless steel pipes and pipe based products with temperatures up to 1000ºF

      ASTM A-193 GR B7

      Alloy steel threaded rod and bolts used in conjunction with restrained expansion joints

      ASTM A-194 GR 2H

      Alloy steel heavy duty hex nut paired with ASTM A-193 GR B7 threaded rod and bolts

      ASTM A-193 GR B8

      Certified stainless steel threaded rod used in conjunction with restrained expansion joints

      ASTM A-194 GR 8

      Certified stainless steel hex nuts paired with ASTM A-193 GR B8 threaded rod and bolts

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