Properties of hot worked finned tubing of steel 12Kh1MF

Abstract

1. Finned tubing of steel 12Kh1MF obtained by extrusion and by extrusion followed by hot precision forging meets the requirements of MRTU 14-4-21-67 in terms of structure and short-term mechanical properties. 2. The strength characteristics after precision forging, normalization, and tempering are higher than for the extruded metal, with approximately the same ductility: σb = 57 kg/mm2, σ0.2 = 42 kg/mm2, and δ=29% after precison forging; σb = 50 kg/mm2, σ0.2 = 38 kg/mm2, δ=30.2% after extrusion. 3. With the same time to failure after extrusion forging the ductility, especially in long-term tests, is considerably higher after precision forging.