Custom Material & Alloy Selection Services
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.
Standard Stainless Steel Alloys
Optimized for general-purpose service and corrosion resistance, our stainless steels cover most industrial demands:
- ASTM A240 T-321
- Titanium-stabilized 300-series stainless steel
- Heat-resistant up to 1,200 °F
- Exceptional inter-granular corrosion and stress-cracking resistance
- ASTM A240 T-304/304L
- Austenitic stainless steel, dual-certified
- Heat-resistant up to 1,200 °F
- Strong against inter-granular corrosion and chloride stress
- ASTM A240 T-316/316L
- Molybdenum-stabilized alloy
- Service temperatures to 1,000 °F
- Superior general corrosion resistance
- ASTM A240 T-310
- High-temperature austenitic alloy
- Service up to 1,500 °F
- Excellent oxidation resistance
High-Performance Nickel Alloys
When your custom metal bellows require extreme temperature or chemical resistance, choose from our premium alloys:
- ASTM B-536 Alloy 330
- Service up to 1,500 °F
- High-nickel strength; resists carburization, oxidation, and thermal shock
- ASTM B-168 Alloy 600 (Inconel 600)
- Service to 1,200 °F
- Excellent oxidation and carburization resistance; chloride-tolerant
- ASTM B-443 Alloy 625 (Inconel 625)
- Service to 1,200 °F
- Outstanding strength plus molybdenum- & columbium-enhanced corrosion resistance
- ASTM B-435 Alloy X (Hastelloy X)
- Service up to 1,500 °F
- Nickel-chromium-iron alloy with excellent creep and oxidation resistance
- ASTM B-575 Alloy C-276 (Hastelloy C-276)
- Service to 1,200 °F
- High-nickel, molybdenum, chromium alloy; superior pitting and stress-corrosion cracking resistance
Hardware & Fittings Materials
Our expansion joint flanges, tie-rods, and accessories use robust steels and stainless plates:
| Material | Description | Temperature Rating |
| ASTM A-36 | Carbon steel for plate flanges, tie rods, gussets | up to 750 °F |
| ASTM A-516 Gr 70 | Enhanced alloy steel plate | up to 1,000 °F |
| ASTM A-240 T-304/316/321 | Stainless steel plate for special flanges & hardware | up to 1,000 °F |
| ASTM A-53-E Gr B | Welded carbon steel pipe (radiograph checked) | up to 750 °F |
| ASTM A-106 Gr B | Seamless carbon steel pipe | up to 750 °F |
| ASTM A-105 | Forged steel RFSO flanges & couplings | varies |
| ASTM A-234 Gr WPB | Carbon steel elbows & reducers | varies |
| ASTM A-182 F 304/316 | Stainless steel forged flanges & fittings | up to 1,000 °F |
| ASTM A-312 Gr 304/316 | Stainless steel pipe products | up to 1,000 °F |
| ASTM A-193 Gr B7/B8 | Alloy & stainless threaded rod for restrained joints | varies |
| ASTM A-194 Gr 2H/8 | Heavy-duty hex nuts | varies |