A high-chromium-high-molybdenum ferritic stainless steel seamless pipe and its manufacturing method
A technology of a seamless pipe material and a manufacturing method, which is applied in the field of high-chromium and high-molybdenum ferritic stainless steel seamless pipe material and its manufacturing field, can solve the problem of hindering the production of high-chromium and high-molybdenum ferritic stainless steel seamless pipe material, affecting the processing and forming of materials, Poor plasticity and other problems, to achieve the effect of improving plasticity, avoiding brittle phase precipitation, and reducing brittleness
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example 1
[0047] a. Vacuum induction furnace alloying smelting: use returned steel, pure iron and other alloys, metals, etc. as raw materials to smelt molten steel in a vacuum induction furnace. When the molten steel composition is: C0.016%, Si0.32%, Mn0.54 %, S0.003%, P0.030%, Cr18.00%, Mo4.5%, Ni1.5%, N0.015%, Ti0.15%, Nb0.35%, Cu0.45%, Co0.05 %, V0.03%, Al0.05%, and the balance of iron and unavoidable impurities, the steel is tapped and cast into a 3.5t ingot;
[0048] b. Preliminary rolling: the steel ingot is subjected to preliminary rolling thermal processing, the heating temperature is controlled at 1150°C, and the holding time is 3 hours; the steel billet after preliminary rolling is 180×180×5700~6000mm 3 ; Afterwards, the surface of the billet is fully polished, the defects are cleaned, and the head and tail are sawn off before being sent to the continuous rolling mill;
[0049] c. Hot-rolled billet: heat-process the billet after initial rolling, control the heating temperatur...
example 2
[0057] a. Use electric arc furnace, LF refining furnace, and vacuum refining furnace for alloying smelting in sequence: use returned steel, pure iron and other alloys, metals, etc. as raw materials to smelt molten steel in a vacuum refining furnace. When the molten steel composition is: C0.03 %, Si0.55%, Mn0.51%, S0.014%, P0.022%, Cr30.0%, Mo1.0%, Ni3.0%, N0.04%, Ti0.30%, Nb0.50 %, Cu0.30%, Co0.06%, V0.05%, Al1.0%, and the balance of iron and unavoidable impurities, the steel is tapped and cast into a 3.5t steel ingot;
[0058] b. Preliminary rolling: the steel ingot is subjected to preliminary rolling thermal processing, the heating temperature is controlled at 1050°C, and the holding time is 5 hours; the steel billet after preliminary rolling is 180×180×5700~6000mm 3 ; Afterwards, the surface of the billet is fully polished, the defects are cleaned, and the head and tail are sawn off before being sent to the continuous rolling mill;
[0059] c. Hot-rolled billet: heat-proce...
example 3
[0067] a. Vacuum induction furnace for alloying smelting: use returned steel, pure iron and other alloys, metals, etc. as raw materials to smelt molten steel in a vacuum induction furnace. When the molten steel composition is: C0.005%, Si0.80%, Mn0 .56%, S0.002%, P≤0.030%, Cr24.2%, Mo2.44%, Ni2.35%, N0.0015%, Ti0.20%, Nb0.10%, Cu0.15%, Co0 .15%, V0.15%, Al0.5%, and the balance of iron and unavoidable impurities, the steel is tapped and cast into a 3.0t steel ingot;
[0068] b. Preliminary rolling: the steel ingot is subjected to preliminary rolling thermal processing, the heating temperature is controlled at 1100°C, and the holding time is 1.5 hours; the steel billet after preliminary rolling is 150×150×5700~6000mm 3 ; Afterwards, the surface of the billet is fully polished, the defects are cleaned and the head and tail are sawn off before being sent to the 650 rolling mill;
[0069] c. Hot-rolled billet: heat-process the billet after preliminary rolling, control the heating ...
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