Hastelloy C™

What is Hastelloy C™?

Hastelloy C is an alloy composed of nickel, molybdenum, chromium and iron, Hastelloy™ Alloy-C maintains its outstanding properties in extreme heat, holding its strength and resisting oxidation. Hastelloy C is also resists chlorine and compounds with chlorine, as well as strong oxidizing acids, acid mixes and salts. One of the most corrosion-resistant alloys, it’s exceptional in high-stress applications and in environments prone to repeated thermal shock.

Hastelloy C Forgings

Hastelloy has become popular because of its staggering list of achievements, but corrosion resistance remains at the top of the list. With nickel, molybdenum and chromium in the mix, Hastelloy C is highly weldable and offers tremendous heat resistance that makes it perfect for applications in seals, springs and other pieces of mechanical structures such as aerospace parts.

The experienced professionals of All Metals & Forge offer true expertise in all the nickel alloys. Whether you want to get your hands on any of the Hastelloy grades or simply want to try a more basic alloy such as Incoloy 600 or 800, you will not find a wider selection of forms and finishing processes than those available here. The ISO9001:2000- and AS9100-certified engineers here can even accommodate special requests for forms that may fall outside the purview of standard shapes.

Feel free to use this site as a resource for all your steel-related questions. Many alloys can offer radically different properties with the addition of just a few elements, and often tweaking the proportions can result in profound changes. If you want to learn the science behind these blends or simply use the handy tools to calculate what you need, let this be your resource to do it.

Hastelloy is just one of many, many alloys All Metals & Forge makes available on a daily basis. Special orders are always welcome, and the team endeavors daily to exceed client expectations for speed, safety, tolerances and affordability. Please do not hesitate to call All Metals & Forge at (973) 276-5000 or send an email to info@steelforge.com.

Chemical Composition of Hastelloy C™

  • Carbon 0.15 max
  • Tungsten 3.75-5.25
  • Iron 4.5-7.0
  • Chromium 15.5-17.5
  • Molybdenum 16.0-18.0
  • Vanadium 0.20-0.40
  • Manganese 1.0 max
  • Silicon 1.0 max
  • Phosphorus 0.04 max
  • Sulfur 0.03 max
  • Nickel remainder

Heat Treatment of Hastelloy C™

    • Anneal: Heat at 2235=20 deg F for a length of time dedicated by the mass and cross section. Air cool generally to 1 to 2 hours.
    • Age hardening after annealing:
      • Hold at 1575°-1600°F (857°-871°C) for 8-10 hours
      • Air-cool to Rockwell C 35-40
      • Hold castings for 16 hours at aging temperature to achieve hardness and high yield strength (not required or suggested to resist corrosion on for strength at high temperatures).

Applications of Hastelloy C™

  • Combustion chambers
  • Heat-treating equipment
  • Collector rings, combustion chambers and exhaust stacks for high-heat applications in for conventional aircraft and jets
  • Pipe connections, pumps and valves for oil refinery, chemical and petrochemical applications

Machinability of Hastelloy C™

  • Can be machined at low cutting speeds
  • Use sintered carbide cutting tools and grind to 6-7 degree side clearance and 10-15 degree side rake angle for facing or turning operations
  • Use short drill and grind with minimum clearance to clear the work – generally about 140 degrees total – when drilling
  • Use sulfur-based oil coolant when drilling, or when turning, facing, or boring at higher speeds

Workability of Hastelloy C™

  • Preheat to temperatures to 2200°-2250° F (1204°-1232°C)
  • Forge with hot working procedures:
    • Hammering
    • Pressing
    • Rolling

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