Purpose – This study aims to demonstrate the application of Lean Six Sigma (LSS) at a stainless steel
manufacturer in Türkiye for yield improvement.
Design/methodology/approach – A qualitative approach consisting of a single descriptive case study
was adopted. Both primary and secondary sources were used. The interviews were conducted with the Six Sigma
team. In addition, an in-depth review of the project documents was conducted. The “define, measure, analyze,
improve and control (DMAIC)” phases were explained by examining the tables, facts and figures. The company’s
downgraded rate owing to defective materials was 0.21%. Root causes were detected in the tension unit, carpet
cleaning, coating unit, film surface and cleaning of the rolls. Therefore, improvements were taken accordingly.
Findings – The rolled throughput yield was 99.05%, and the defect rate was reduced to 0.08% after
implementing LSS, which provided statistically proven results and a direct reflection on customer satisfaction.
Originality/value – To the best of the author’s knowledge, this is the first case study examining the
application of LSS to improve the yield of a medium-sized stainless steel company in Türkiye.
Keywords Customer satisfaction, Lean six sigma, Sustainable marketing, Stainless steel industry,
Yield improvement, Türkiye
Paper type Case study