Abstract: The main material of common medical and industrial gas cylinders is 37Mn steel of Mn series. Normalizing treatment is mainly adopted for cylinder steel. However,the mechanical properties of normalized 37Mn cylinder steel are unstable ,and it yield strength and impact energy cannot meet setting in standards. In this paper, by adding Cr and N micro elements ,the chemical composition of microalloying 37Mn steel is /% ：0.34 ~0.38 C,0.20 ~0.27 Si, 1.60 〜1.70 Mn, 0.10 ~0.20 Cr,0.004 0 ~0.0090N,of normalized rolled;219mm x6mm steel tube,the yield strength≥530 MPa,tensile ≥750 MPa and impact energy 13.2J,fully meet the needs of customer.

摘要： 常见的医用气瓶、工业气瓶主要材质为37Mn类Mn系气瓶钢。气瓶钢主要采用正火热处理工艺,但正火态37Mn钢材质的气瓶力学性能不稳定,屈服强度及冲击功达不到标准设定要求。通过加入Cr、N等微量元素的微合金化37Mn钢化学成分为/%:0.34～0.38C,0.20～0.27Si,1.60～1.70 Mn,0.10～0.20 Cr,0.0040～0.0090N,经正火轧制的Φ219mm×6mm钢管屈服强度≥530MPa,抗拉强度≥750 MPa,冲击功≥13.2J,完全能满足客户使用需求。

关键词: 气瓶钢, 37Mn钢, Cr-N微合金化, 正火, 无缝钢管, 力学性能