You run an annealing furnace at 800°C. Parts go in, come out, and your wire mesh conveyor belt needs replacing every few months. The belt sags. The links seize. You blame the heat.
The heat isn't the problem. Your belt material is.
Why 304 Fails
Standard 304 stainless steel wire belt has a maximum operating temperature around 750°C . At 800°C, it begins to scale, lose strength, and sag between supports. The chromium carbides precipitate, leaving the steel vulnerable to oxidation. Your wire mesh conveyor belt doesn't fail suddenly—it stretches, then jams, then tears .
What 800°C Requires
A wire conveyor belt for 800°C annealing needs 316, 316L, or 314 stainless . The addition of molybdenum in 316 resists scaling at high temperatures. The higher nickel content in 314 handles thermal cycling without cracking.
For continuous 800°C operation, some facilities use Inconel 600 or 601, which maintain strength up to 1150°C . The upfront cost is higher, but the belt lasts years instead of months.
Weave Pattern Matters
Even with the right alloy, a wire mesh conveyor belt with tight spirals will trap scale and debris at high temperatures. A universal weave or double balanced weave allows debris to fall through while maintaining strength . Crimped connectors (not straight pins) handle thermal expansion better .
Real-World Fix
A heat treater switched from 304 to 316L stainless steel conveyor mesh belt in their 800°C furnace. Belt life went from 4 months to 14 months. The 316L resisted scaling and kept its tension.
Your wire belt can handle 800°C – if you choose the right grade. 316 or 314 for steady work. Inconel for heavy duty. And always choose a weave that breathes.
