Seamless steel tube for drive shaft and method for manufacturing the same
A technology of seamless steel pipe and manufacturing method, which is applied in manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of increased stress concentration sensitivity, decreased fatigue strength, easy development, etc., and achieves the effect of ensuring fatigue strength.
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Embodiment 1
[0065] Cold-drawn steel pipes after hot finishing or intact steel pipes after hot finishing are cold-reduced, and product evaluation tests are performed by studying the torsional fatigue strength. The chemical composition of the test material was, in mass %, C: 0.40%, Si: 0.28%, Mn: 1.07%, Cr: 0.14%, Ti: 0.032%, and B: 0.0014%, with the balance being Fe.
[0066] First, after piercing and rolling a round billet, elongation rolling was performed with a mandrel rolling mill, reheated at 900°C, and the outer diameter was reduced and rolled with a stretching and shrinking mill to produce a 35mm, 8mm wall thickness hot finished steel pipe. Then, changing the grinding time, inner surface grinding was performed by sandblasting under various conditions.
[0067] Next, pickling and lubrication were carried out on the steel pipe after the inner surface was ground, and after cold drawing with a cylindrical mandrel, an annealing treatment was performed at 700°C for 20 minutes to manufact...
Embodiment 2
[0081] After performing the same thermal process and grinding treatment as in Example 1, cold drawing was performed to manufacture a steel pipe for a drive shaft. About 38% cold reduction was performed on the steel pipe for a drive shaft for the test, and the fatigue life when used as a drive shaft as a final product was evaluated.
[0082] The evaluation dimensions here are an outer diameter of 28 mm, an inner diameter of 9 mm, and a wall thickness of 9.5 mm. The inner diameter reduction ratio of the cold reducing process was about 71%, and the fatigue characteristics were evaluated under stricter conditions than in Example 1.
[0083] For evaluation, similar to Example 1, a sample for microscopic observation was produced, dmax and w / d were investigated, and at the same time, the Vickers hardness Hv at 500 μm in the inner surface layer of the steel pipe was measured.
[0084] Wherein, the heat treatment condition before the cold reducing process is uniformly heated to 780-79...
Embodiment 3
[0090] The production conditions of the present invention were confirmed. The chemical composition of the test material contained C: 0.45%, Si: 0.23%, Mn: 0.76%, and Cr: 0.16% by mass%, and the balance was Fe.
[0091] as mentioned above figure 1 As shown, the round steel billet is pierced and rolled by the Manesman value pipe manufacturing method, and then the wall thickness is processed mainly by the mandrel rolling mill. Next, it is put into a reheating furnace and reheated at 900°C.
[0092] In the next stretching and shrinking mill, 20 sets of 3-high rolling stands are used to roll the reheated hollow billet. In carrying out this rolling, instead of mandrels or other mandrels, multiple sets of rolls are used for rolling.
[0093] Steel pipes that have been thermally finished by stretching and shrinking rolling mills are subjected to internal surface grinding by sandblasting, pickling, lubrication, and cold drawing using a cylindrical mandrel, followed by annealing at 70...
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Abstract
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