This document summarizes a data challenge being conducted by SMS digital to improve the detection of defects in steel slabs during the casting process. The challenge involves analyzing two datasets to detect longitudinal cracks and types of brittleness. Participants are asked to register on the challenge website, analyze the data using state-of-the-art methods, and submit their results by the deadline for a chance to win €15,000 and a private factory tour. The goal is to develop better models that can beat the existing PCA benchmark for defect detection.