A ferrite stainless steel Cr27Mo6Al3Cu with oxidation resistance

A new ferrite steel Cr27Mo6Al3Cu with high Mo and low Al is developed, exhibiting excellent oxidation resistance, corrosion resistance, and mechanical property. Alloy rods with a diameter of 10 mm were prepared by copper mold suction-casting method and then solution-treated at 1373 K for 2 h. The experimental results show that this alloy maintains a stable monolithic BCC microstructure. After oxidization at 1373 K for 100 h, a dense and thin oxide layer is generated on the surface of the alloy with the weight gain per unit area G+ being about 0.4863 g/m2. Its corrosion-resistant property in 3.5 wt.% NaCl at 298 K is characterized with the corrosion potential Ecorr being about −0.091 V, pitting corrosion potential Eb reaching up to 0.867 V. Its mechanical properties are yield tensile strength σ0.2 = 523 MPa, ultimate tensile strength σb = 637 MPa respectively.

► A new ferrite steel Cr27Mo6Al3Cu has been developed.
► This steel maintains a single BCC lattice.
► This steel exhibits excellent oxidation resistance at 1373 K.
► This steel shows good corrosion resistance in 3.5 wt.% NaCl.