Medical high-nitrogen nickel-free austenitic stainless steel and preparing method thereof
An austenitic stainless steel and austenitic technology, which is applied in the field of medical stainless steel material preparation, can solve the problems of human health hazards, high nickel price, singleness, etc., and achieve the effects of being beneficial to growth, saving resources and solving allergic reactions.
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Embodiment 1
[0037] A preparation method of medical high-nitrogen nickel-free austenitic stainless steel, comprising the steps of:
[0038] 1) Nitrogen-containing nickel-free duplex stainless steel powder X15CrMn with a particle size of -500 mesh and pore-forming agent NH 4 HCO 3 According to the mass fraction of 70:30, mix it in a V-type powder mixer for 24 hours until the powder is fully mixed and poured into the steel mold. The chemical composition of the nitrogen-containing nickel-free duplex stainless steel powder X15CrMn (wt.%) It is: Mn: 10.84, Cr: 17.5, Mo: 3.400, N: 0.44, Ni: 0.36, C: 0.059, O: 0.134, and the rest is Fe.
[0039] 2) Then press the mixed powder into a green body with a diameter of about 15 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine 10 with a pressure of 200 MPa (see figure 1 ).
[0040] 3) if figure 2 As shown, the green body is placed in the tube furnace 3 for pre-sintering, the furnace tube is protected by flowing hydroge...
Embodiment 2
[0048] A method for preparing medical high-nitrogen nickel-free austenitic stainless steel, comprising the steps of:
[0049] 1) Nitrogen-containing nickel-free duplex stainless steel powder X15CrMn with a particle size of -500 mesh and pore-forming agent NH 4 HCO 3 According to the mass fraction of 50:50, mix it in a V-type powder mixer for 12 hours until the powder is fully mixed and poured into the steel mold. The chemical composition of the nitrogen-containing nickel-free duplex stainless steel powder X15CrMn (wt.%) It is: Mn: 10.84, Cr: 17.5, Mo: 3.400, N: 0.44, Ni: 0.36, C: 0.059, O: 0.134, and the rest is Fe.
[0050] 2) Then press the mixed powder into a green body with a diameter of about 15 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine with a pressure of 374 MPa.
[0051] 3) Place the green body in a tube furnace for pre-sintering, flow hydrogen protection through the furnace tube, the gas flow rate is 300ml / min, and then o C / min ...
Embodiment 3
[0057] A preparation method of medical high-nitrogen nickel-free austenitic stainless steel, comprising the steps of:
[0058] 1) Nitrogen-containing nickel-free duplex stainless steel powder X15CrMn with a particle size of -600 mesh and pore-forming agent NH 4 HCO 3 According to the mass fraction of 70:30, mix in a V-type powder mixer for 48 hours until the powder is fully mixed and uniform, and the mixed powder is poured into a steel mold. The chemical composition of the nitrogen-containing nickel-free duplex stainless steel powder X15CrMn (wt.%) It is: Mn: 10.84, Cr: 17.5, Mo: 3.400, N: 0.44, Ni: 0.36, C: 0.059, O: 0.134, and the rest is Fe.
[0059] 2) Then press the mixed powder into a green body with a diameter of about 15 mm and a height of about 5 mm on a CMT5105 electronic universal testing machine 10 with a pressure of 500 MPa (see figure 1 ).
[0060] 3) Place the green body in a tube furnace for pre-sintering, the furnace tube is protected by flowing hydrogen ga...
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