Hot-continuous-rolled axle housing steel with favorable plate shape and manufacturing method thereof
A manufacturing method and hot continuous rolling technology, applied in the field of hot continuous rolling, can solve the problems of uneven compressive stress, overall buckling deformation, uneven distribution of plastic strain of strip steel, etc., so as to prevent the decline of fatigue performance and improve welding performance. Effect
Active Publication Date: 2015-10-07
武汉钢铁有限公司
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Problems solved by technology
However, the unit production efficiency rate of medium and heavy plate production line is low, and the product yield rate is low, resulting in medium and heavy plate products being much higher than hot-rolled products. Therefore, the production of hot-rolled steel plates with good shape has good economic benefits and a broad market prospect
[0003] At present, the unevenness of the flattened hot-rolled axle housing steel plate can basically meet ≤3‰, but the uneven distribution of plastic strain (mainly longitudinal plastic strain) along the width direction of the flattened steel strip, due to the coordination of deformation, in the strip Uneven compressive stress is generated inside the steel, but it is not enough to cause the buckling deformation of the strip steel. After the cutting process, the longitudinal plastic strain of the strip steel remains unchanged, and the stress is redistributed, resulting in overall buckling deformation and warping defects.
The bent steel plate cannot enter the heating equipment such as the intermediate frequency induction furnace, which affects the smooth progress of production
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[0018] The hot-rolled axle housing steel with good plate shape and the manufacturing method thereof of the present invention will be further described in detail below in conjunction with specific examples.
[0019] According to the steel composition design requirements of the present invention, three groups of steels of smelting furnace number examples A, B, and C are shown in Table 1 for specific chemical compositions.
[0020] The chemical composition (wt %) of the example of the present invention of table 1
[0021] furnace number
C
Si
mn
P
S
Ti
Example A
0.126
0.58
1.55
0.012
0.006
0.012
Example B
0.158
0.34
1.40
0.008
0.009
0.018
Example C
0.193
0.21
1.23
0.010
0.005
0.006
[0022] Three groups of steels of furnace number examples A, B and C were respectively rolled into steel coil examples 1 to 6, wherein comparative example 7 was rolled fr...
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Abstract
The invention discloses a hot-continuous-rolled axle housing steel with favorable plate shape and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: 0.12-0.20% of C, 0.20-0.60% of Si, 1.20-1.60% of Mn, at most 0.015% of P, at most 0.010% of S, 0.005-0.02% of Ti, and the balance of Fe and inevitable impurities. The manufacturing method comprises the steps of molten steel smelting, steel slab casting, slab heating, hot continuous rolling, laminar cooling treatment and coiling, wherein the heating temperature is 1180-1240 DEG C, the rough rolling outlet temperature is 1020-1080 DEG C, the finishing temperature is 820-860 DEG C, the steel slab is held in a holding hood before finish rolling at 980-1040 DEG C for 40-60 seconds, and the coiling temperature is 560-600 DEG C. The steel has favorable comprehensive mechanical properties, and can satisfy the technical requirement for the unevenness of at most 3mm / m. The preparation method is simple to operate, and has the advantages of energy saving and stable product properties.
Description
technical field [0001] The invention belongs to the technical field of hot continuous rolling, and specifically refers to a hot continuous rolling axle housing steel with good plate shape and a manufacturing method thereof. Background technique [0002] With the development of domestic heavy-duty vehicles, the thickness and strength of the axle housing steel are also increasing. The hot stamping forming process is an effective way to solve the low power of the stamping equipment, and it can also reduce the cracking tendency of the axle housing steel. In order to improve heating efficiency, axle housing steel manufacturers generally use intermediate frequency induction furnaces for heating, and the furnace height of intermediate frequency induction furnaces is generally 20mm. For hot stamped steel plates with a thickness of 14 and 16mm, this requires them to have a good shape. . The axle housing steel plate with good original plate shape will be deformed due to the uneven di...
Claims
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IPC IPC(8): C22C38/14B21B1/26B21B37/28
Inventor 梁文刘永前彭涛马珩皞王孟王立新周银波汪水泽周祖安
Owner 武汉钢铁有限公司