High-strength steel sheet
A high-strength steel plate and plate thickness technology, applied in the furnace type, furnace, heat treatment furnace and other directions, can solve the problems of not meeting the required value and reducing the tensile strength of welded joints, and achieve the effect of increasing the manufacturing cost and making a significant contribution.
Active Publication Date: 2019-01-04
NIPPON STEEL CORP
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Problems solved by technology
However, in the case of welding a steel plate in which the main structure of the metal structure is martensite, the tensile strength (joint strength) of the welded joint decreases compared with the base metal due to the softening of the heat-affected zone of the weld, which may not meet the requirements. Required value
Method used
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[0162] Examples of the present invention will be described below. The conditions in the examples shown below are examples of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is not limited by the examples of conditions. In addition, the present invention can adopt various conditions without departing from the gist of the present invention and within the limit to achieve the object of the present invention.
[0163] The steel slabs obtained by smelting the chemical components shown in Table 1 (the balance being Fe and impurities) were produced under the manufacturing conditions shown in Table 2 to produce steel plates with a thickness of 4.5 to 20 mm. "Heating temperature" indicates the reheating temperature of the billet, "rolling end temperature" indicates the end temperature of hot rolling, "water cooling start temperature" indicates the surface temperature of the steel plate at the beginning of accelerated coo...
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Abstract
Provided is a high-strength steel sheet which has a prescribed chemical composition and comprises one or two types of martensite and bainite in which the DI is 2.0 to 7.8, the Pcm is 0.189% or more, and the metallic structure is 99% or more in total area ratio. The aspect ratio of old austenite grains is 2.0 or more; the number fraction of cementite in which the length in the long axis direction is 1.0 [mu]m or more relative to cementite in which the length in the long axis direction is 0.1 [mu]m or more is 5% or less; the sheet thickness is 4.5 to 20 mm; the yield strength is 885 MPa or more;the tensile strength is 950 MPa or more; the breaking elongation is 12% or more; and the Charpy absorbed energy at -20 DEG C is 59 J / cm2 or more.
Description
technical field [0001] The present invention relates to high-strength steel plates. Background technique [0002] Along with high-rise buildings, etc., construction machines such as cranes and industrial machines are increasing in size. However, in order to further increase the size, it is necessary to reduce the weight of structural members of construction machines and industrial machines. Therefore, in order to reduce the weight of structural members, it is required to increase the strength of steel materials used in construction machinery and industrial machinery. [0003] However, if the strength of the steel sheet is increased and the thickness of the steel sheet is limited in order to suppress an increase in the weight of the member, the elongation at break generally decreases. For example, when the plate thickness is limited to 25 mm or less, it is difficult to ensure a breaking elongation of 12% or more. When the plate thickness is limited to 8 mm or less, it is m...
Claims
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Login to View More IPC IPC(8): C22C38/00C21D8/02C22C38/14C22C38/58
CPCC22C38/14C22C38/04C22C38/38C22C38/02C22C38/001C22C38/002C22C38/12C22C38/22C21D2211/008C21D2211/002C21D2211/003C21D9/46C21D8/0263C21D8/0226C22C38/06C22C38/26C22C38/28C22C38/32C22C38/20C22C38/24C22C38/40C22C38/005C21D1/02C21D1/60C22C38/08C22C38/16
Inventor 吉村仁秀皆川昌纪川端纪正都筑岳史
Owner NIPPON STEEL CORP