大直徑連軋管機芯棒的研制

R & D of Mandrel for Large-sized MPM

摘要: 分析了大直徑連軋管機芯棒的使用條件,提出了連軋管機芯棒用鋼的化學成分,芯棒熱處理工藝和芯棒表面鍍鉻層質量控制措施。研制出的芯棒用H13鋼的主要理化指標符合北美壓鑄協(xié)會NADCA 207-2006《優(yōu)質和超級H13鋼材和熱處理驗收》標準對優(yōu)質熱作模具鋼的質量要求。芯棒的組織、性能、壽命均達到了國際先進水平,其制造成本比進口芯棒降低了28%左右。

Abstract: Operational conditions of the mandrel of the large-sized MPM are analyzed, resulting in determination of the MPM mandrel-purpose steel, the heat treatment process for the mandrel and control measures for quality of the mandrel surface chromium-coating. The main physiochemical targeted values of the H13 Steel as developed for making the said MPM mandrel have been up to the requirements for quality of the hot-work die steel as specified under Specification NADCA 207-2006——Quality Super H13 Steel and Heat Treatment Acceptance. As a result, the structure, properties and service span of the mandrel have also been up to relevant advanced international level, whereas manufacture cost thereof is 28% lower than that of the imported ones.