關於「en47 chemical composition」標籤，搜尋引擎有相關的訊息討論：

[PDF] DNVGL-OS-B101 Metallic materials - Rules and standards3 Steels differing from these requirements in chemical composition, deoxidation practice, condition of supply and mechanical properties may be acceptable, ...缺少字詞： en47 twEN47 Spring Steel | EN47 Forging | EN47 Flat -