Steel sheet and manufacturing method therefor
A steel plate, plate thickness technology, applied in the field of steel plate and its manufacturing, to achieve the effect of excellent fatigue characteristics
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Embodiment 1
[0159] The front and back sides of the hot-rolled steel sheet with a thickness of 2 mm with the components A to F shown in Table 1-1 were pickled, and the front and back sides of the steel plate with a hard layer attached to the front and back layers were cut by cutting. After finishing the thickness of the layer to 0.8mm and finishing the thickness of the inner layer to 0.4mm, the attached surface is polished with #180 abrasive paper, and dirt is removed by ultrasonic washing. In addition, for the steel sheet with the hard layer attached only to the surface layer, the surface layer thickness was finished to 0.8 mm by cutting, and the inner layer thickness was finished to 1.2 mm, and the above-mentioned polishing and washing were performed.
[0160] Next, the combinations shown in Example Nos. 1 to 30 in Table 2 were overlapped, inserted into a 1000° C. heating furnace under a load of 0.2 MPa, and kept for 120 minutes before being taken out. After cooling to room temperature for ...
Embodiment 2
[0168] Next, in order to investigate the influence of the thickness of the hard layer, based on the combination of Invention Example No. 23 in Table 2, the thickness of the hard layer and the inner layer was controlled in advance by cold rolling, and the changes were made according to the previously described procedure. Sample Nos. 31 to 47 with a thickness of 2 mm in proportion to the thickness of the hard layer.
[0169] Table 3 shows the evaluation results of each sample. Nos. 34 to 46 of the invention examples all show that the thickness of the hard layer is 20 μm or more and 40% or less of the total plate thickness, and the fatigue characteristics and cold workability are excellent.
[0170] On the other hand, the thickness of the hard layer of Nos. 31 to 33 of the comparative example was less than 20 μm, and the fatigue characteristics were reduced. In addition, the thickness of the hard layer of Comparative Example No. 47 exceeded 40%, and the cold formability was reduced. ...
Embodiment 3
[0172] Next, in order to investigate the influence of the components, a sample with a thickness of 1.2 mm with the composition of D, E, and F in Table 1-1 was fixed as an inner layer, and a sample with a composition of j to aj with a thickness of 0.4 mm The composition was incorporated in the hard layer, and the influence on the composition was investigated (Example Nos. 48 to 92). Furthermore, the samples having the composition of a, b, and c in Table 1-2 were fixed as a hard layer with a thickness of 0.4 mm, and samples having a composition of G to AJ with a thickness of 1.2 mm were combined into the inner layer , The influence of ingredients was evaluated (Example Nos. 93 to 141). In the production of each sample, the thickness of the plate was adjusted by cutting according to the previously described steps, grinding and washing were performed, and diffusion heat treatment was performed. The sample was inserted into a furnace heated to 900°C, held for 20 minutes, and then ta...
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Abstract
Description
Claims
Application Information
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