Alloy steel and pipe products with high energy absorption capability

摘要

In addition to inevitable impurities and iron resulting from inevitable molten impurities during refining, the present invention comprises the following ingredients in weight percent: C 0.05-0.6% Total of Cr + 2 × Ti + 3 × (Mo + V + Nb) + 4 × W = 2-7% Alloy steel having a high energy absorption capacity and good formability, wherein the structure of the alloy steel includes 10-40% by volume of retained austenite in addition to martensite, and tensile strength ( The energy absorption capacity represented by the product of Rm) and uniform strain (Ag) is higher than 12,000 MPa%, and the minimum tensile strength is 1,000 MPa. Moreover, this invention is a steel pipe product provided with the high energy absorption capability and favorable moldability which at least one part is comprised with the said alloy steel. [Selection] Figure 2