Steel shot and preparation method thereof
A steel shot and consistent technology, applied in the field of metal products and its preparation, can solve the problems of short service life of steel shot, large hardness deviation, low impact resistance, etc., and achieve good surface shape consistency, small hardness deviation, and surface strength moderate effect
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Embodiment 1
[0063] Raw materials: the proportion of elements in the wire rod is composed of 0.43% carbon, 0.5% manganese, 0.25% silicon, 0.02% and 0.01% sulfur, and the iron makes up the mass percentage to 100%.
[0064] Preparation:
[0065] 1. Select materials according to the above raw material requirements, cold draw the wire rod for 3 times, and then go through weak sulfuric acid dipping and vacuum isothermal annealing heat treatment twice to get semi-finished steel wire;
[0066] 2. Wire drawing: After 5-15 cold drawing, it is drawn into steel wires with different diameters between 0.3-2.0 mm; the hardness range is HV430±50HV.
[0067] 3. Cutting: Use a wire cutter to cut the steel wire into cylindrical sections with the same diameter. The cut section is required to be flat, burr-free, and tail-free.
[0068] 4. Screening: Screening for different nominal sizes of steel shots. The nominal size of the sieve is 0.3-2 mm.
[0069] 5. Conduct hardness, density and fatigue life testing...
Embodiment 2
[0081] Raw materials: the proportion of elements in the wire rod is composed of 0.50% carbon, 0.55% manganese, 0.3% silicon, 0.015% sulfur and 0.02% phosphorus by weight percentage, and the iron makes up the mass percentage to 100%.
[0082] Preparation:
[0083] 1. Select materials according to the above raw material requirements, cold draw the wire rod for 5 times, and then go through weak sulfuric acid dipping and vacuum isothermal annealing heat treatment twice to obtain semi-finished steel wire;
[0084] 2. Wire drawing: After 5-15 cold drawing, it is drawn into steel wires with different diameters between 0.3-2.0 mm; the hardness range is HV430±50HV.
[0085] 3. Cutting: Use a wire cutter to cut the steel wire into cylindrical sections with the same diameter. The cut section is required to be flat, burr-free, and tail-free.
[0086] 4. Screening after surface rounding and strengthening: Screening for different nominal sizes of steel shots. The nominal size of the sieve...
Embodiment 3
[0099] Raw materials: the proportion of elements in the wire rod is composed of 0.48% carbon, 0.65% manganese, 0.2% silicon, 0.01% sulfur and 0.015% phosphorus, and the iron makes up the mass percentage to 100%.
[0100] The preparation method is the same as in Example 2.
[0101] The composition weight ratio of the steel shot thus obtained is: 0.48% carbon, 0.65% manganese, 0.2% silicon, 0.01% sulfur and 0.015% phosphorus, and the iron supplements the mass percentage to 100%.
[0102] The size distribution ratio data of the steel shot is the same as Table 6, and the final passing rate of the steel shot is: CW≤0.6%, G1≤0.5%, G2≤0.5%, G3≤0.5%. The standard nominal size range of steel shot: 0.30-2.00 mm. The hardness grade and hardness range of steel shot are the same as Table 7, and the performance data are shown in Table 9.
[0103] Table 9
[0104]
[0105] It can be seen from Table 9 that the service life of the steel shot of the present invention is at least 15-100% h...
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