Furnace and Heat-Treatment Alloy Scrap
Source industry
Furnaces and heat-treatment lines use Inconel 600 and 601, Haynes 214 and 230, Hastelloy X and Nimonic 75 for muffles, retorts, radiant tubes, baskets and fixtures. These parts wear out regularly, so furnace rebuilds are a steady source of nickel alloy scrap.
Background
Why Heat Treatment and Furnaces Uses Nickel Alloys
Furnace parts live at 800–1,200 °C (1,470–2,190 °F) in oxidising or carburising atmospheres. Nickel-chromium alloys with aluminium or tungsten resist scaling and keep their shape longer than heat-resistant steels.
Scrap comes from routine replacement of muffles, retorts, radiant tubes, baskets and fixtures, and from full furnace rebuilds.
The chain
From Component to Scrap
Where the alloy served, which grades are used there, and the scrap that comes back.
Inconel 600, Inconel 601
Plate and fabricated shells
Inconel 601, Haynes 230
Tube and castings
Inconel 601, Haynes 214, Nimonic 75
Fabrications and castings
Haynes 214, Inconel 601
Wire mesh
Grades
Grades from This Industry
Open a grade for its composition, identification and standards.
| Grade | Typical use in this industry |
|---|---|
| Inconel 600 | Furnace muffles, retorts and heat-treatment fixtures |
| Inconel 601 | Radiant tubes, muffles and retorts |
| Haynes 214 | Furnace mesh belts and heat-treat fixtures |
| Haynes 230 | Gas turbine combustors and transition ducts |
| Hastelloy X | Gas turbine combustors and transition ducts |
| Nimonic 75 | Gas turbine sheet components |
| Ni-Resist Type 5 | Machine-tool and precision equipment parts |
Standards
Standards Behind This Scrap
Furnace parts in 600, 601, X and 230 are fabricated from ASTM B168, B435 and B572 plate and bar, or cast to foundry specifications. Heat-treatment fixtures rarely keep their markings, so grade is usually proved by XRF.
| Grade | Main product standards |
|---|---|
| Inconel 600 | ASTM B168, ASTM B166, ASTM B167, ASTM B163 |
| Inconel 601 | ASTM B168, ASTM B166, ASTM B167, ASTM B163 |
| Haynes 214 | OEM specifications |
| Haynes 230 | ASTM B435, ASTM B572, ASTM B622, ASTM B619 |
| Hastelloy X | ASTM B435, ASTM B572, ASTM B622, ASTM B619 |
| Nimonic 75 | BS HR 5, BS HR 504, BS HR 203, BS HR 403 |
| Ni-Resist Type 5 | ASTM A436 |
Before you sell
Things to Know
Furnace parts are often heavily oxidised and distorted. Scale is weight the buyer can’t melt, so heavily scaled material is discounted.
Questions
FAQ
Is oxidised furnace scrap still valuable?
Yes, but surface scale and any carburised layer reduce the metal yield, so the offer reflects the expected loss.
Is carburised furnace scrap still nickel alloy scrap?
Yes, but carburising adds carbon to the surface and makes parts brittle. Buyers may test for carbon and adjust the offer.
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