Ultra-free cutting ferritic stainless steel fine wire and its preparation method
A kind of stainless steel and ferrite technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of performance degradation such as tensile strength and elongation, and achieve the effect of long tool life, high processing efficiency and excellent performance
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[0036] The preparation method of the ultra-free-cutting ferritic stainless steel fine wire of the present invention comprises the steps of pickling, surface treatment and cold drawing in sequence. Optionally, after the cold drawing step, the preparation method of the present invention further includes an annealing step, and annealing→cold drawing is repeated.
[0037] The raw material used in the preparation method of the ultra-free-cutting ferritic stainless steel refined wire of the present invention is a hot-rolled wire rod of super-free-cutting ferritic stainless steel, and the diameter of the hot-rolled stainless steel wire rod is 5.5-20 mm, including of the following components:
[0038] C+N≤0.05%, Si<1.0%, Mn 1.0~2.0%, P≤0.05%, S 0.15~0.40%, Cr 19~21%, Mo 1.0~2.0%, 0.05<Bi<0.5%, and the remaining components are Iron and other impurity elements not exceeding 0.5%.
[0039] Specifically, the preparation method of the ultra-free cutting ferritic stainless steel fine wire...
Embodiment 1
[0065] The specification of the raw stainless steel hot-rolled disc is Φ20mm, and the chemical composition (mass fraction) is as follows:
[0066]
[0067] The preparation process of the refined thread of the present embodiment is:
[0068] (1) pickling: adopting concentration is the H of 50% (weight) 2 SO 4 The solution carried out pickling for the first time to the stainless steel hot-rolled wire rod for 30 minutes, then adopting acid concentration is 50% (weight) HF and HNO 3 The mixed acid solution was pickled for the second time for 15 minutes, and then the surface of the stainless steel hot-rolled wire rod was rinsed clean with clean water.
[0069] (2) Surface treatment: Treat with phosphate for 10 minutes and soak in saponification solution for 10 minutes, then dry in oven for 2 hours.
[0070] (3) Cold drawing: The hot-rolled stainless steel plate after coating enters the drawing machine, and is drawn with the pass specification of "Φ20mm→Φ18.2mm→Φ16.6mm". The w...
Embodiment 2
[0072] The specification of the raw stainless steel hot-rolled disc is Φ5.5mm, and the chemical composition (mass fraction) is as follows:
[0073]
[0074] The preparation process of the refined thread of the present embodiment is:
[0075] (1) pickling: adopting concentration is the H of 25% (weight) 2 SO 4 The solution carried out pickling for the first time to the stainless steel hot-rolled wire rod for 50 minutes, then adopting acid concentration is 35% (weight) HF and HNO 3 The mixed acid solution was pickled for the second time for 25 minutes, and then the surface of the stainless steel hot-rolled wire rod was rinsed clean with clean water.
[0076] (2) Surface treatment: Treat with phosphate for 10 minutes and soak in saponification solution for 10 minutes, then dry in oven for 2 hours.
[0077] (3) Cold drawing: The coated stainless steel hot-rolled disc enters the drawing machine, using "Φ5.5mm→Φ4.9mm→Φ4.4mm→Φ4.0mm→Φ3.7mm→Φ3.3mm→Φ3.0mm" The pass specification ...
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