An Inconel screen is a woven wire screen cloth made from Inconel nickel-chromium superalloy wire, used in vibratory screeners for high-temperature screening applications up to 1,000°C (1,832°F) where standard stainless steel would lose strength, oxidize, or scale. Inconel is a family of nickel-chromium-based superalloys developed by Special Metals Corporation, with Inconel 600 (76% Ni, 15.5% Cr, 8% Fe) and Inconel 625 (62% Ni, 21.5% Cr, 9% Mo, 3.6% Nb) being the grades most commonly woven into screen cloth for vibratory screening applications.
The defining characteristic of Inconel is its ability to maintain mechanical strength and resist oxidation and scaling at extreme temperatures. Where 304 SS and 316 SS lose significant tensile strength above 500-600°C and suffer rapid surface degradation above 870°C, Inconel retains usable strength and forms a stable, protective oxide layer that resists scaling to approximately 1,000°C. This makes Inconel screen cloth essential for hot material classification in metal powder processing, ceramics, calcined mineral screening, and other elevated-temperature vibratory screening operations.
Inconel Screen Properties
| Property | Inconel 600 | Inconel 625 | 304 SS (Comparison) |
|---|---|---|---|
| Nickel Content | 76% | 62% | 8–10.5% |
| Chromium Content | 15.5% | 21.5% | 18–20% |
| Max Service Temperature | 1,093°C (2,000°F) | 982°C (1,800°F) | 870°C (1,600°F) |
| Tensile Strength at RT | 550–690 MPa | 827–1,034 MPa | 515–620 MPa |
| Strength Retention at 650°C | ~85% of RT value | ~90% of RT value | ~55% of RT value |
| Oxidation Resistance | Excellent to 1,000°C | Excellent to 980°C | Moderate to 870°C |
| Magnetic Response | Weakly magnetic | Non-magnetic | Non-magnetic (annealed) |
| Cost Index vs. 304 SS | 6–10x | 8–14x | 1.0x |
Why This Matters in Vibratory Screening
Inconel screen is the solution for vibratory screening at temperatures where all stainless steel grades fail. While a premium material, it is the only practical option for certain high-temperature classification tasks.
- Hot material classification — Screening freshly calcined minerals, hot metal powders, or materials exiting furnaces and kilns requires screen cloth that maintains structural integrity at process temperature. Inconel screens hold their tension and aperture dimensions where stainless steel would sag, stretch, and ultimately fail.
- Oxidation resistance — At temperatures above 700°C, stainless steel forms heavy scale that clogs apertures and contaminates the screened product. Inconel's chromium-rich oxide layer remains thin and adherent, preserving open area and preventing metallic contamination.
- Thermal cycling durability — Many high-temperature screening operations involve repeated heating and cooling. Inconel's low coefficient of thermal expansion relative to its strength minimizes fatigue from thermal cycling, extending screen life in start-stop operations.
- Chemical + heat combined environments — Inconel 625, with its molybdenum and niobium additions, also provides excellent corrosion resistance, making it the choice when both high temperature and chemical corrosion are present — such as in flue gas desulfurization or chemical reactor discharge screening.
Related Glossary Terms
- Hastelloy Screen — Superalloy optimized for chemical resistance at lower temperatures
- Monel Screen — Nickel-copper alloy for marine and acid environments
- 316 Stainless Steel — Standard upgrade from 304 SS for corrosive environments
- Fatigue Life — Vibration cycles before wire failure, affected by temperature
- Corrosion Resistance — Material's ability to resist environmental degradation
Inconel Screen FAQs
What temperature can Inconel screen withstand?
Inconel 600 screen cloth maintains usable strength up to approximately 1,000°C (1,832°F) in oxidizing atmospheres. Inconel 625 offers slightly better high-temperature corrosion resistance due to its molybdenum and niobium content. By comparison, 304 and 316 stainless steel begin to lose significant tensile strength above 500-600°C and suffer rapid scaling above 870°C. Inconel retains both structural integrity and oxidation resistance at temperatures where stainless steel fails.
What is the difference between Inconel and Hastelloy screen?
Both are nickel-based superalloys, but they are optimized for different extremes. Inconel is primarily designed for high-temperature service, maintaining strength and resisting oxidation at temperatures up to 1,000°C. Hastelloy is primarily designed for chemical resistance, withstanding acids and corrosive chemicals that attack other alloys at lower temperatures. Choose Inconel when temperature is the primary challenge and Hastelloy when chemical corrosion is the primary challenge.
Order Inconel Replacement Screens
ScreenerKing manufactures Inconel 600 and 625 replacement screens for high-temperature vibratory screening applications — compatible with Sweco, Kason, Midwestern Industries, and other OEM separators. Custom fabrication available with extended lead times.
