Hangbo Alloy Group
Shanghai · Est. 2012
Heat-treatment fixtures are consumables, but the wrong alloy turns them into a recurring cost. This guide shows why nickel-chromium alloys (RA330, Alloy 600, 601, 602CA, 800H) and ACI cast grades (HK40, HP, HU) outlast stainless 309/310 in carburizing, nitriding and cyclic-heat service — and how to pick the right one for your furnace.
Baskets, trays, grids, retorts, fans and radiant tubes are the consumable skeleton of every heat-treatment furnace. They are loaded, heated, quenched and reloaded thousands of times. They are made from stainless 309 or 310 when the duty is mild, but as soon as the duty turns hot, cyclic or carburizing, those grades crack, sag and embrittle in months. The fix is a nickel-chromium alloy whose austenite, oxide scale and creep strength are designed to survive that exact combination.
This guide gives heat-treat engineers, fixture designers and procurement teams a practical framework for specifying nickel alloys for heat-treatment furnace fixtures, baskets and trays. As a direct nickel alloy manufacturer and supplier, Hangbo Alloy Group produces and stocks RA330, Inconel 600, 601, 602CA, Incoloy 800H/800HT, 253 MA and the matching ACI cast grades, in bar, plate, sheet, wire, welded mesh and finished fabricated baskets, with mill test certificates and third-party inspection.
Heat-treatment fixtures die in three distinct ways — creep, carburization and thermal fatigue — and each is decided by alloy chemistry. The four metals that dominate fixture service are stainless 309/310, RA330, Alloy 600/601/602CA and ACI cast HK40/HP/HU. Their behavior splits cleanly:
Golden rule: Pick a fixture alloy by the dominant failure mode (creep, carburization, thermal fatigue or sigma embrittlement) and the worst-case local metal temperature, not by alloy name alone. The four families above map cleanly onto those four failure modes.
Fixture performance follows from chemistry. Higher nickel stabilizes the austenite against phase change; higher chromium builds the oxide scale; silicon and aluminum tighten it against carbon and oxygen; the cast grades add carbide formers (Nb, Ti) for creep strength.
| Alloy (UNS) | Family | Ni % | Cr % | Fe % | Si % | Al % | Other |
|---|---|---|---|---|---|---|---|
| 309 (S30900) | Stainless | 12–15 | 22–24 | bal. | ≤1.0 | — | — |
| 310 (S31008) | Stainless | 19–22 | 24–26 | bal. | ≤1.5 | — | — |
| RA330 / Alloy 330 (N08330) | Fe-Ni-Cr | 34–37 | 18–20 | bal. | 1.0–1.5 | — | C 0.08 |
| Inconel 600 (N06600) | Ni-Cr-Fe | ≥72 | 14–17 | 6–10 | ≤0.5 | — | — |
| Alloy 601 (N06601) | Ni-Cr-Fe-Al | 58–63 | 21–25 | bal. | ≤0.5 | 1.0–1.7 | — |
| Alloy 602CA (N06025) | Ni-Cr-Fe-Al-Ti | 59–65 | 24–26 | 8–11 | ≤0.5 | 1.8–2.4 | Ti 0.1–0.2, Zr 0.01–0.1, Y 0.05–0.12 |
| Incoloy 800H (N08810) | Fe-Ni-Cr | 30–35 | 19–23 | 39.5 min | ≤1.0 | 0.15–0.60 | Ti 0.15–0.60 |
| 253 MA (S30815) | Stainless (Ce+N) | 10–12 | 20–22 | bal. | 1.4–2.0 | — | Ce 0.03–0.08, N 0.14–0.20 |
| ACI HK40 (J94204 cast) | Cast Fe-Ni-Cr | 19–22 | 23–27 | bal. | ≤1.75 | — | C 0.35–0.45 |
| ACI HP (N08705 cast) | Cast Ni-Fe-Cr-Nb | 33–37 | 23–27 | bal. | ≤1.5 | — | Nb 1.2–1.8, C 0.35–0.45 |
| ACI HU (N08005 cast) | Cast Ni-Fe-Cr | 37–41 | 17–21 | bal. | ≤2.5 | — | C 0.35–0.45 |
The contrast tells the story: as duty moves from clean anneal to hot cyclic oxidation to carburizing to creep-loaded static, the alloy climbs the nickel ladder (12% → 35% → 61% → 63%) and the silicon/aluminum content rises. The cast grades trade some ductility for a carbide skeleton that carries much heavier load at the same temperature.
Typical room-temperature, annealed values for the wrought grades; the cast grades are reported in their as-cast condition. For creep data use the manufacturer's elevated-temperature stress-rupture curves.
| Alloy | Density (g/cm³) | Tensile (MPa) | Yield 0.2% (MPa) | Elongation % | Approx. Max Service (°C)* |
|---|---|---|---|---|---|
| 309 stainless | 7.9 | ≥515 | ≥205 | ≥40 | ~1000 |
| 310 stainless | 7.9 | ≥515 | ≥205 | ≥40 | ~1100 |
| RA330 / Alloy 330 | 8.0 | ≥517 | ≥207 | ≥40 | ~1150 |
| Inconel 600 | 8.47 | ≥550 | ≥240 | ≥30 | ~1150 |
| Alloy 601 | 8.11 | ≥650 | ≥300 | ≥30 | ~1200 |
| Alloy 602CA | 7.9 | ≥680 | ≥320 | ≥30 | ~1250 |
| Incoloy 800H | 8.0 | ≥450 | ≥180 | ≥30 | ~1100 |
| 253 MA | 7.8 | ≥650 | ≥310 | ≥40 | ~1100 |
| ACI HK40 (cast) | 7.75 | ≥485 | ≥240 | ≥10 | ~1100 |
| ACI HP (cast) | 7.85 | ≥485 | ≥260 | ≥8 | ~1150 |
| ACI HU (cast) | 7.85 | ≥485 | ≥260 | ≥8 | ~1150 |
*“Max service” is the approximate continuous-service ceiling in air. It is set by atmosphere, load and cycle count — a lightly loaded grid will run for years at the top of its band, while a heavily loaded creep-stressed tray at the same temperature may fail in months. Always size to worst-case local temperature and confirm by stress-rupture data.
The atmosphere is what decides between RA330, Alloy 600, 601 and 602CA. The summary below reflects well-established heat-treat and metallurgical data for steady-state service; always confirm against the actual recipe (gas composition, dew point, peak T, cycle count) and consider coupon testing for new duty.
| Atmosphere / Service | Recommended Alloy | Notes |
|---|---|---|
| Clean anneal / oxidizing air, ≤~950°C, light duty | 309 / 310 stainless | Cheapest; embrittles in carburizing |
| Carburizing (endothermic, RX, methanol) | RA330 / Alloy 600 / HU | High Ni + Si blocks carbon ingress |
| Nitriding (NH₃, ~500–600°C) | RA330 / Inconel 600 | Resist nitride precipitation & embrittlement |
| Cyclic oxidation, 1000–1150°C | Alloy 601 / RA330 | Alumina scale on 601, scale adhesion on 330 |
| Top-temp 1200°C+ creep + oxidation | Alloy 602CA | Best combination of creep + scale life |
| Reducing / H₂ / cracked NH₃ | Inconel 600 / Alloy 601 | Stable in low-oxygen atmospheres |
| Vacuum heat-treat | Alloy 600 / 601 / RA330 | Low outgassing; clean, oxide-free surface |
| Salt bath (neutral / cyanide) | Inconel 600 / RA330 | Resist salt corrosion & thermal shock |
| Heavy static load, reformer / retort | ACI HK40 / HP / HU | Carbide-strengthened for creep |
| Metal-dusting-prone (450–850°C, low-O₂, carbonaceous) | Alloy 602CA / 693 / RA330 | Tightest Cr/Al oxide scale available |
The most useful way to enter the selection is by the failure mode that dominates the service. This reframing inverts the naive “cheapest alloy that survives the temperature” decision:
Engineering practice: pick the worst-case local metal temperature, the dominant failure mode, and the cycle count — then map to the alloy family that is built for that combination. Do not pick a single alloy for the entire furnace if temperatures vary by zone.
The workhorse fixture alloy. 35% Ni + 19% Cr + 1.5% Si gives it exceptional resistance to carburization and nitriding at temperatures that destroy 309/310, and its balanced composition avoids the sigma-phase embrittlement that hits high-chromium stainless after long holds. Used for carburizing baskets, nitriding fixtures, muffles, retorts, fan shafts and the broadest range of heat-treat service to ~1150°C. Repairable and re-straightenable in service.
76% nickel + 16% chromium + 8% iron. The classic Ni-Cr-Fe alloy and the standard for nitriding, reducing atmospheres, vacuum heat-treat and dry halogen-bearing environments at moderate temperature. Excellent ductility and weldability. Good for fixtures that need to combine heat resistance with thermal-fatigue survival in the 600–1100°C band.
61% Ni + 23% Cr + 1.4% Al. The premium wrought grade for clean-air cyclic oxidation. Its aluminum builds a tight, adherent alumina scale that survives repeated heat/cool cycles with minimal spalling, so it is the right basket material for high-temperature air furnaces, oxidizing anneal, and most alloy-steel heat treatment up to ~1200°C. Not the same as Inconel 600 for general corrosion resistance (e.g. wet H₂SO₄); specify for the cyclic-oxidation duty it was designed for.
63% Ni + 25% Cr + 2.1% Al, with deliberate Ti / Zr / Y additions. The top-grade wrought fixture material for the hottest 1200°C+ service, combining the best available creep strength (approaching cast HK40/HP in section), alumina-scale oxidation life, and carburization/metal-dusting resistance. Specified for radiant tubes, pusher-furnace fixtures, and the most demanding continuous-furnace service.
Fe-Ni-Cr (33% Ni + 21% Cr) with controlled Ti/Al and a controlled coarse grain size (ASTM 5 or coarser) for high-temperature creep. The standard for petrochemical and ethylene-cracker furnace tubes, reformer outlet pigtails and high-temperature structural supports. Good ductility, weldable, well understood in the heat-treat and petrochemical industries.
A nitrogen-strengthened 21Cr-11Ni stainless with cerium and silicon additions that build a highly protective oxide scale. A cost-effective alternative to Alloy 601 for clean-air cyclic duty up to ~1100°C; widely used in iron-powder annealing muffles and radiant tubes. Not for carburizing.
Sand- or investment-cast high-nickel iron-chromium alloys built for static, heavily loaded service. HK40 (25Cr/20Ni) is the workhorse; HP adds Nb for extra creep-rupture strength (reformer grade); HU (39Ni) is the high-nickel cast grade for severe carburizing + thermal cycling. Coarse grain (ASTM 00) and a carbide skeleton give them much higher load-bearing capacity at temperature than any wrought grade, but their low ductility makes them crack when cycled. Specified for retorts, heavy trays, muffles and structural supports in continuous furnaces.
| Your Heat-Treat Service Condition | First Choice | Upgrade When… |
|---|---|---|
| Clean anneal, ≤~950°C, light load, few cycles | 309 / 310 stainless | Hotter / cyclic → RA330 / 601 |
| Carburizing (RX, endothermic), ≤~1050°C | RA330 (N08330) | Hotter / heavier → HU cast / 602CA |
| Nitriding, 500–600°C | Inconel 600 / RA330 | Harsh atmosphere → 602CA |
| Cyclic oxidation, 1000–1150°C | Alloy 601 (N06601) | Top temp → 602CA |
| Top-temp 1200°C+ creep + oxidation | Alloy 602CA (N06025) | Heaviest load → HP / HU cast |
| Reducing / H₂ / cracked NH₃ | Inconel 600 (N06600) | Hotter → 601 / 602CA |
| Vacuum heat-treat | Alloy 600 / 601 / RA330 | Higher load → 602CA |
| Heavy static load, retort / reformer | ACI HK40 / HP / HU (cast) | Cyclic → 602CA wrought |
| Metal-dusting-prone (450–850°C, low-O₂) | Alloy 602CA / 693 / RA330 | Coupon test in actual atmosphere |
| Need chloride / wet corrosion resistance too | Alloy 625 / C-276 | Not the primary fixture role |
Heat-treat fixtures are often the first place the limits of an alloy become obvious. Three high-temperature phenomena decide life:
Specifying practice: confirm the worst-case local metal temperature (not the nominal furnace setpoint — fixtures in radiant tubes or near heating elements run 100–200°C hotter), check the atmosphere, and review the load and cycle count. Then map to the alloy family that has been engineered for that combination.
Hangbo Alloy Group manufactures and supplies heat-treat fixture alloys in the full range of mill forms, with mill test certificates and third-party inspection (SGS, TÜV, BV) available:
| Alloy (UNS / W.Nr) | Plate / Sheet | Rod / Bar | Tube / Pipe | Forgings / Cast |
|---|---|---|---|---|
| RA330 / Alloy 330 (N08330 / 1.4886) | ASTM B536 | ASTM B511 / B512 | ASTM B535 / B546 | ASTM B564 |
| Inconel 600 (N06600 / 2.4816) | ASTM B168 | ASTM B166 | ASTM B167 / B163 | ASTM B564 |
| Alloy 601 (N06601 / 2.4851) | ASTM B168 | ASTM B166 | ASTM B167 | ASTM B564 |
| Alloy 602CA (N06025 / 2.4633) | ASTM B168 | ASTM B166 | ASTM B167 | ASTM B564 |
| Incoloy 800H (N08810 / 1.4958) | ASTM B409 | ASTM B408 | ASTM B407 | ASTM B564 |
| Incoloy 800HT (N08811 / 1.4959) | ASTM B409 | ASTM B408 | ASTM B407 | ASTM B564 |
| 253 MA (S30815 / 1.4835) | EN 10095 | EN 10095 | EN 10296 | — |
| ACI HK40 (J94204 cast) | — | ASTM A297 | ASTM A608 | ASTM A297 / A567 |
| ACI HP (N08705 cast) | — | ASTM A297 | ASTM A608 | ASTM A297 |
| ACI HU (N08005 cast) | — | ASTM A297 | ASTM A608 | ASTM A297 |
All wrought grades are also referenced by EN/DIN (W.Nr.), ISO, AMS and GB standards and are covered by ASME pressure-vessel and boiler codes where applicable. Cast grades are governed by ASTM A297 (general) and ASTM A608 (centrifugal cast tubes). For export projects always specify the UNS number plus the applicable ASTM/EN execution standard (e.g. ASTM B536 for RA330 plate, ASTM B168 for Alloy 601 plate). Welding of RA330 is qualified with ERNiFeCr-1 / RA330-04 filler per AWS A5.14 / A5.11; Alloy 600 with ERNiCr-3 (Inconel 82); Alloy 601 with ERNiCrFe-11; cast grades use high-nickel cast-welding consumables with strict preheat / interpass control.
Not sure whether your heat-treat duty calls for RA330, Alloy 600, 601, 602CA, Incoloy 800H or a cast HK40 / HP / HU — or whether 309/310 stainless will survive? Send us your furnace type, peak operating temperature, atmosphere (air, endothermic, NH₃, vacuum), cycle count per shift, load per fixture, and any standards to be met, and our metallurgists will recommend the most cost-effective certified alloy. As a direct manufacturer and supplier, we offer competitive price quotes, full material certification and worldwide delivery of bar, plate, sheet, wire, mesh, tubes, castings and fabricated fixtures.
Email: [email protected] | Phone / WhatsApp: +86-136-1165-6360
There is no single answer — fixture alloy choice is set by temperature, atmosphere, load and cycle count. As a practical default: RA330 (Alloy 330, UNS N08330) is the workhorse for carburizing/nitriding fixtures up to ~1150°C because its 35% Ni + 19% Cr + Si balance gives excellent resistance to carbon and nitrogen pickup. Alloy 601 (UNS N06601) is the preferred wrought grade for cyclic oxidation up to ~1200°C thanks to its aluminum + chromium alumina scale. Alloy 602CA (UNS N06025) is the strongest wrought grade for ~1200°C+ creep duty. For very heavy loaded cast trays, HK40 / HP / HU (ACI cast) are the standards. Inconel 600 and Alloy 800H serve intermediate temperature and reducing atmospheres.
Stainless 309 and 310 (UNS S30900 / S31008) are low-cost, high-chromium austenitic grades that handle clean oxidizing atmospheres at moderate temperature. They fail earlier and more dramatically in real heat-treat service for three reasons: (1) lower nickel content makes them susceptible to carburization and nitriding pickup, which embrittles them; (2) they have lower creep strength, so heavy baskets sag and bottom out in continuous furnaces; (3) they are more prone to thermal-fatigue cracking under repeated heating/cooling cycles. RA330, Alloy 600, Alloy 601 and 602CA carry 35–76% nickel, which both stabilizes the austenite against phase transformation and gives them the ductility and oxidation scale that fixtures need to survive years of service.
Approximate continuous-service ceilings for the common fixture alloys: 309 stainless ~1000°C; 310 stainless ~1100°C; Inconel 600 (N06600) ~1150°C; RA330 / Alloy 330 (N08330) ~1150°C; Incoloy 800H (N08810) ~1100°C; Alloy 601 (N06601) ~1200°C; Alloy 602CA (N06025) ~1250°C; ACI cast HK40 / HP / HU ~1100–1150°C. These are engineering guides, not absolute limits — actual ceiling depends on load (creep), atmosphere (carburizing vs clean air) and the number of thermal cycles the fixture must survive. A lightly loaded grid will run for years at the top of its band; a heavily loaded creep-stressed tray at the same temperature may fail in months.
Wrought alloys (RA330, Alloy 600/601, 602CA) are rolled bar, plate and wire product. They have finer grain, higher ductility and far better thermal-fatigue life, so they are the right choice for baskets, trays and grids that see many heating/cooling cycles. Cast alloys (ACI HH, HK40, HP, HU) are sand- or investment-cast into the rough shape of a heavy support, fixture base or retort. They have a coarser grain and a carbide skeleton that gives much higher creep-rupture strength at temperature, but they are more brittle and crack faster when cycled. The two families overlap in temperature ceiling but not in use: wrought for cycled fixtures, cast for static, heavily loaded structural supports.
Carburization is the diffusion of carbon into the alloy surface in a carbonaceous furnace atmosphere (endothermic gas, methane, propane, RX atmospheres). The dissolved carbon precipitates as chromium carbides at grain boundaries, embrittles the metal, and causes surface 'metal dusting' that can quickly destroy a fixture. The resistance order follows nickel and silicon: alloys with ≥30% Ni and ≥1.5% Si form a tight, self-healing Cr-oxide scale that blocks carbon ingress. RA330 (35% Ni + 1.5% Si), Alloy 600 (76% Ni) and ACI HU (39% Ni) are the benchmark carburization-resistant grades. Alloys with low nickel and no silicon — 309, 410, carbon steel — absorb carbon aggressively and embrittle in weeks in a carburizing furnace.
Metal dusting is a catastrophic form of carburization that occurs at 450–850°C in strongly carbonaceous, low-oxygen atmospheres: the bulk metal decomposes into a powdery mix of metal, carbon and oxide. It can drill a hole through a fixture wall in weeks. Prevention requires an alloy that builds and holds a continuous, dense, self-healing Cr-oxide (or Al-oxide) scale. RA330, Alloy 600, Alloy 601, Alloy 602CA and Inconel 693 are all specifically designed to resist metal dusting; the better the scale, the longer the service life. Adding a small amount of sulfur (H2S, SO2) to the atmosphere, or operating slightly more oxidizing, can also suppress metal dusting when the alloy itself cannot be upgraded.
Thermal fatigue is the cracking that develops at welds, holes and stress concentrators when a fixture is heated and cooled repeatedly. The lower the alloy's coefficient of thermal expansion, the more uniform the strain, the more cycles it survives. Austenitic nickel-chromium alloys (RA330, 310, 600) have moderate expansion and high ductility, so they absorb the strain instead of cracking. Cast alloys (HK40, HP, HU) have lower ductility and crack faster when cycled — they belong in static service, not high-cycle service. The number of cycles to failure also depends on the maximum temperature swing, the joint design and weld quality; smooth, stress-relieved joints survive orders of magnitude more cycles than sharp notches.
RA330 (Alloy 330, UNS N08330): 35% Ni + 19% Cr + 1.5% Si — the workhorse fixture alloy, best for carburizing/nitriding atmospheres up to ~1150°C, weldable and repairable, no sigma-phase embrittlement after long holds. Alloy 601 (UNS N06601): 61% Ni + 23% Cr + 1.4% Al — premium oxidation resistance in clean cyclic-heat service up to ~1200°C; the aluminum builds a tight alumina scale. Alloy 602CA (UNS N06025): 63% Ni + 25% Cr + 2% Al + Ti + Zr + Y — best combination of creep strength, oxidation resistance and carburization resistance; the top-grade wrought choice for the hottest 1200°C+ cycled fixtures. Choose RA330 for carburizing, 601 for clean-air cyclic oxidation, 602CA when both creep and oxidation must be maximised.
Sigma phase is a hard, brittle Fe-Cr (or Fe-Cr-Mo) intermetallic that precipitates when ferritic, austenitic and high-chromium alloys are held for long periods in the 540–900°C range. It dramatically reduces room-temperature ductility and impact toughness, so a fixture that has been in service for a year can crack during normal handling. RA330 was specifically developed to resist sigma-phase embrittlement, which is one reason it is the workhorse fixture alloy. Alloys with high molybdenum (e.g. 316 stainless) and high chromium without nickel stabilization are the most susceptible; 309 and 310 are moderately susceptible, and 304 is the worst. When in doubt about a long-life fixture, ask for a sigma-phase-resistant grade like RA330 or controlled-titanium 321/347.
Wrought: Inconel 600 = UNS N06600 (W.Nr 2.4816); Alloy 601 = UNS N06601 (W.Nr 2.4851); Alloy 602CA = UNS N06025 (W.Nr 2.4633); RA330 / Alloy 330 = UNS N08330 (W.Nr 1.4886); Incoloy 800H = UNS N08810 (W.Nr 1.4958); Incoloy 800HT = UNS N08811 (W.Nr 1.4959); 253 MA = UNS S30815 (W.Nr 1.4835). Cast (ACI): HH = J93503; HK40 = J94204; HP = N08705; HU = N08005. Stainless comparators: 309 = S30900 (1.4828); 310 = S31008 (1.4845). For export projects, always specify the UNS number plus the applicable ASTM/EN execution standard (e.g. ASTM B536 for RA330 plate, ASTM B168 for Alloy 601 plate).
The standard fillers match the parent: RA330 is welded with RA330-04 (ERNiFeCr-1) or RA330-70 covered electrode; Alloy 601 with ERNiCrFe-11 (Inconel 601) or matching covered; Alloy 600 with ERNiCr-3 (Inconel 82) or ENiCrFe-2 covered. Cast HK40 / HP / HU use matching high-nickel cast-welding consumables (e.g. 50Ni-50Cr type) and require strict preheat / interpass control because castings are sensitive to thermal shock. GTAW/TIG is preferred for thin mesh and sheet, GMAW/MIG and SMAW for heavier plate and field repairs. Always use stringer beads, low interpass temperature, and pure argon backing on root passes; pickling and passivation restore the Cr-oxide layer after welding.
Because fixtures are consumables, the right metric is cost per cycle over the full life of the basket, not the purchase price. A cheap 309 tray may cost less upfront but embrittle and fail in months in carburizing service; an RA330 tray of the same size costs 3–5× more but survives years in the same duty, so its cost per cycle is far lower. For a 1600°F (870°C) continuous pusher furnace with 5 psi static stress, published creep data shows 310 stainless reaches 1% creep strain in roughly 1,800 h, while a nickel-chromium alloy reaches the same strain in 6,000 h — a 3× difference in fixture life. The optimization rule: match the alloy ceiling to the worst-case local temperature, and re-check the loading every time the heat-treat recipe changes.
Send your furnace type (batch, pusher, belt, rotary, vacuum), peak operating temperature, atmosphere (air, endothermic, nitrogen, vacuum), cycle count per shift, load (kg per fixture), fixture type (basket, tray, grid, retort, fan, radiant tube) and any standards to be met (ASTM, AMS, DIN) to Hangbo Alloy Group at [email protected] or call/WhatsApp +86-136-1165-6360. As a direct nickel alloy manufacturer and supplier we provide competitive price quotes, expert grade selection (RA330 vs 601 vs 602CA vs cast HK40/HP/HU), mill test certificates to ASTM B536/B168/B409, third-party inspection (SGS, TÜV) and worldwide delivery of bar, plate, sheet, wire, welded mesh and castings.
For help choosing between RA330, Alloy 600, 601, 602CA, 800H/800HT or cast HK40/HP/HU for your heat-treatment furnace fixtures — or for a quotation on bar, plate, sheet, wire, mesh, tubes, castings or fabricated baskets — contact Hangbo Alloy Group. We typically respond within 10 minutes and ship worldwide from our Shanghai facility.
Email: [email protected]
Phone: +86-136-1165-6360
WhatsApp: +86 13611656360
Send us your furnace type, peak temperature, atmosphere, cycle count and load — and we will recommend the most cost-effective certified nickel alloy (RA330, 600, 601, 602CA, 800H or cast HK40/HP/HU) with a competitive quote and full material certification.