Controlling Hot-Rolled Stainless Sheet to ±0.05 mm for Turbocharger Precision Components

The customer was a confidential global industrial technology and turbocharger supplier program. The project required hot-rolled stainless sheet for turbocharger precision components, with a thickness window much tighter than standard supply.

For this application, selecting the right coil alone was not enough. Material selection, head-and-tail control, leveling and on-site measurement all had to work together to avoid dimensional variation and surface-quality risk.

The problem combined four constraints: no suitable standard tolerance, conflict between dimensional precision and forming performance, excessive machining cost if thicker sheet was used, and order volume below typical mill customization thresholds. This made the issue not only a procurement problem but also a production-readiness bottleneck for the customer’s component program.

We extended supply-chain control into the coil selection and leveling process. Instead of asking the mill to change its rolling process, we worked with mill data and historical coil thickness distribution to predict which coils were most likely to meet the target range. During leveling, technicians monitored both sides of the line, carried out visual surface inspection and used micrometers for high-frequency grid-style thickness measurement.

The workflow combined data prediction with hands-on inspection. Surface defects such as roll marks, scratches and remaining scale were filtered out, while thickness readings were recorded and fed back in real time. This created a micro-level quality gate inside a standard industrial process, turning ordinary hot-rolled coil into pre-selected, ready-to-use precision sheet.

HydroPlatide controlled the route from original mill coil to final leveling: mill coil verification, strict removal of head and tail sections with poor surface quality, and multi-frequency on-site measurement during processing.

The final sheet maintained the required ±0.05 mm thickness control and created a repeatable supply basis for turbocharger precision components.

This case shows that the value of a specialist material partner often sits in the gap between upstream mill standards and downstream component requirements. Data can guide selection, but disciplined inspection and responsibility at the processing site are what convert a difficult non-standard requirement into a repeatable supply solution.