Coloured austenite stainless steel material with high corrosion resistance and high hardness and production method thereof
A kind of technology of austenitic stainless steel and manufacturing method, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of easy wear, low surface hardness, and low adhesion force of base metal, etc., to achieve Reduced manufacturing costs, good corrosion resistance, and good decorative effects
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Embodiment 1
[0059] Use STS304, STS316 and STS310 materials to manufacture tubes with an outer diameter of φ30mm, a thickness of 1mm, and a length of 300mm. The tube was loaded into a pit furnace set at 400 °C and heated with N 2 Replace the air in the furnace, and then inject a fluorine-based gas (8% by volume of NF 3 and 92 volume percent N 2 mixed gas) and maintain this state for 20 minutes. Then, with N 2 Nitriding gas at 400°C (60% by volume NF 3 , 10 vol% CO 2 and 30% by volume of N 2 ) in an atmosphere of nitriding for 15 hours, followed by air cooling.
[0060] When the nitriding treatment is carried out in this way, the thicknesses of the compound layers of the STS304, STS316 and STS310 materials are 15 μm, 18 μm, and 14 μm, respectively, and the hardnesses of the compound layers are 1010Hv, 1070Hv, and 1100Hv, respectively. Furthermore, as a result of evaluating corrosion resistance by a salt spray test (KSD 9502), no rust occurred even after 600 hours.
[0061] Grinding ...
Embodiment 2
[0063] Disc-shaped test pieces with a thickness of 5 mm and a diameter of 20 mm were made from STS304 and STS316 materials and plasma nitriding was performed on them. The condition for plasma nitriding is to introduce 80% by volume of N 2 and 20 vol% H 2 The mixed gas was decompressed to 5 Torr, the test piece was used as the cathode and a voltage of about 500V was applied, and it was carried out in a glow discharge state for 13 hours. At this time, the temperature of the test piece was 390° C., and the furnace was cooled to normal temperature in a high vacuum state after the nitriding treatment.
[0064] When plasma nitriding was performed as described above, the thicknesses of the compound layers were 12 μm and 14 μm for STS304 and STS316, respectively, and the hardnesses of the compound layers were 1020 Hv and 1200 Hv, respectively. Its corrosion resistance was evaluated by the salt spray test (KSD 9502), and the results showed that it did not rust even after 600 hours. ...
Embodiment 3
[0067] Salt bath nitriding was carried out on balls with a diameter of 11 mm made of STS316 and STS310. Salt bath nitriding by 45% by weight of NaCN, 45% by weight of Na 2 CO 3 and 15% by weight of (NaK) 4 Fe(CN) 6 The method of immersing the composition in the mixed molten salt for 8 hours was carried out. When salt bath nitriding was carried out as above, the compound layer thicknesses of STS316 and STS310 were 22 μm and 19 μm, respectively, and the hardness of the compound layer was about 1000 Hv for both materials.
[0068] Thereafter, the salt-bath nitrided balls were barrel-milled. The condition of barrel grinding is to immerse 100 balls in a mixture of 500 cc of water, 800 cc of grinding stones with a diameter of 3 mm and 30 cc of abrasive (compound) and make the rotation speed reach 200 rpm for 20 minutes of barrel centrifugal motion.
[0069] The ground ball was oxidized in a mixed gas atmosphere of 60% by volume of oxygen and 40% by volume of nitrogen at 500°C ...
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Abstract
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