Thick steel plate excellent in fatigue resistance in plate thickness direction, manufacturing method thereof, and fillet welded joint using same
A manufacturing method and technology in the direction of plate thickness, applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems of steel plate ductility and toughness reduction, high material cost, etc.
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Embodiment 1
[0090] The steel materials having the compositions shown in Table 1 were hot-rolled under the conditions shown in Table 2 to form thick steel plates with a plate thickness of 55 to 80 mm. These thick steel plates were subjected to residual stress measurement, tensile test, toughness test, and fatigue test. The test method is as follows.
[0091] (1) Determination of residual stress
[0092] A test piece (size: plate thickness (original thickness of the steel plate) × 12.5mm × 300mm [dimension in the direction of plate thickness × dimension in the direction perpendicular to rolling × direction of rolling) is taken from the obtained thick steel plate for residual stress measurement by X-rays Dimensions]), after performing electrolytic polishing on the measurement surface [12.5mm×300mm surface], measure the residual stress in the thickness direction by X-ray at a pitch of 4mm along the thickness direction. The number of lines measured at a pitch of 4 mm along the plate thicknes...
Embodiment 2
[0102] Using thick steel plates 1 to 10 having the chemical composition shown in Table 3, manufactured under the manufacturing conditions shown in Table 4, and having the characteristics shown in Table 4, with a plate thickness of 55 to 70 mm and excellent fatigue properties in the thickness direction, Fillet welded joints, using figure 2 The three-point bending fatigue test is carried out on the fatigue test piece of the three-point bending fillet welded joint with the shape shown. The test methods for confirming the structure, mechanical properties, and fatigue properties in the plate thickness direction of thick steel plates 1 to 10 were performed in the same manner as in Example 1.
[0103] Using the thick steel plates 1 to 10 whose characteristics were confirmed by the above test, in Figure 4 Fillet welded joints were fabricated under the conditions shown, and fatigue tests were performed. As a fatigue test piece, use figure 2 Fatigue test pieces of three-point bend...
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