Thick steel plate and manufacturing method for the same
A manufacturing method and technology for thick steel plates, which are applied in the field of thick steel plates welded with large input energy, can solve the problems that the homogeneity of steel plate materials has not been verified, etc.
Active Publication Date: 2016-04-06
JFE STEEL CORP
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[0085] Hereinafter, the effects of the present invention will be described in detail through examples. After the steel with the composition shown in Table 1 was smelted in a converter, a slab (steel raw material) was produced by continuous casting, and a steel plate with a thickness of 20 to 50 mm was produced under the controlled rolling and accelerated cooling conditions shown in Tables 2 and 3. In Table 1, steel numbers 1 to 10 are examples of the present invention, and steel numbers 11 to 15 are comparative examples in which any of the component compositions falls outside the scope of the present invention. In addition, in Tables 2 and 3, the sub-number A following the steel number is the case of controlled rolling and cooling conditions based on the present invention, and the sub-numbers B1 and B2 are comparisons where one of the manufacturing conditions is outside the scope of the present invention example.
[0086] For the thick steel plate produced by the above-mentio...
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Abstract
The thick steel plate of the invention has a component composition described as follows, that is, in weight percentage the thick steel plate includes: C: 0.030-0.080%, Si: 0.01-0.10%, Mn: 1.20-2.40%, P: 0.008% or less, S: 0.0005-0.0040%, Al: 0.005-0.080%, Nb: 0.003-0.040%, Ti: 0.003-0.040%, N: 0.0030-0.0100%, B: 0.0003-0.0030%, and further includes 1 or more than 2 species selected from Cu, Ni, Cr, Mo, V, Ca, Zr and REM as needed while the remaining part includes Fe and inevitable impurities. Each [Delta]HV (variation range of Vickers hardness (HV)) in the thickness direction and width direction of the plate is 30 or less. The manufacturing method of the invention includes hot rolling after heating a steel raw material with the above component composition to 1000-1300 DEG C, then before accelerated cooling, descaling under a condition where a collision pressure of a jet flow on a surface of the steel plate is 1 MPa or more, and then conducting accelerated cooling.
Description
technical field [0001] The invention relates to a thick steel plate suitable for various steel structures such as ships, marine structures, buildings, and steel pipes, especially for large heat input welding, and a manufacturing method thereof. Background technique [0002] Steel structures used in the fields of ships, marine structures, buildings, steel pipes, and the like are generally finished into structures of desired shapes by joining them by welding. Therefore, from the viewpoint of ensuring safety, these structures are required to ensure the properties of the welded part, mainly the joint strength and joint toughness, in addition to the properties of the base material that are the basis of the steel used, that is, strength, toughness, and elongation. Also excellent. [0003] In addition, in recent years, the above-mentioned ships and steel structures tend to be larger, so the steel materials used are also expected to be higher in strength and thicker, and on the oth...
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IPC IPC(8): C22C38/00C21D8/02C22C38/14C22C38/58
CPCC21D8/0226C21D8/0263C21D2211/002C22C38/00C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38C22C38/42C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 村上善明长谷和邦荒尾亮远藤茂
Owner JFE STEEL CORP