Definitions and conditions that govern the interpretation of our furnace specifications and performance guarantees.
The term refers exclusively to a fully automated system comprising multiple heating zones, an integrated controlled‑atmosphere section, and a forced‑convection cooling chamber. It does not include standalone ovens, batch retorts, or any manual loading equipment. Performance data (throughput, temperature uniformity, grain refinement) is measured under steady‑state operation with a minimum load of 80% of the rated capacity.
We define optimal tensile strength as the range specified in the applicable ASTM or EN standard for the steel grade being processed. Verification is performed on samples taken from the middle third of each coil or batch, after full cooling to ambient temperature. Results are reported as an average of three test specimens; any single specimen falling outside the specified range triggers a full re‑qualification of the heat‑treatment cycle.
A controlled atmosphere means the gas composition (nitrogen, hydrogen, or a custom blend) is maintained within ±2% of the setpoint by volume, with a dew point below –40°C. The chamber must be sealed and purged before each cycle. Atmospheres that include more than 5% hydrogen require additional safety interlocks and are not covered under standard warranty unless explicitly ordered.
No. Our batch ovens are designed for tool steels, spring steels, and low‑alloy grades with a maximum section thickness of 150 mm. For high‑carbon, stainless, or nickel‑based alloys, we recommend the continuous conveyor line or a custom‑engineered solution. Using a standard batch oven for materials outside this scope voids the process‑performance guarantee.
Grain refinement refers to the reduction of prior austenite grain size to ASTM No. 8 or finer, as measured by the intercept method on a polished and etched cross‑section. This is a process capability, not a guarantee for every load. Factors such as incoming material chemistry, prior deformation, and surface condition can affect final grain size and are excluded from our standard warranty.
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Real feedback from plant managers and metallurgists who run Tarniaconti furnaces daily.
“We installed the continuous conveyor line for spring steel strip. Grain size variation dropped from ±2.5 ASTM to ±0.8. Tensile strength now holds 1,520 MPa across every coil.”
“Batch annealing oven let us run 12 different tool steel grades in one shift. The ±4°C uniformity across the chamber means we no longer scrap edge-soft parts.”
“Controlled atmosphere cooling chamber eliminated pearlite banding in our 4140 shafts. Cooling rate repeatability is within 2% cycle to cycle.”
“Retrofitted our old batch furnace with Tarniaconti’s atmosphere control module. Hydrogen dew point stays below –45°C. No decarburization since day one.”
“The conveyor line’s automated load/unload cut our cycle time by 34%. We now run 22 tonnes per shift with zero manual intervention.”