Method for improving straightness of X70M pipeline steel plate through secondary straightening
A steel plate flatness, X70M technology, applied in the metallurgical field, can solve problems such as poor flatness of steel plates, and achieve the effect of reducing deformation resistance and improving flatness.
Active Publication Date: 2022-03-15
SD STEEL RIZHAO CO LTD
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Problems solved by technology
[0003] Aiming at the problems of poor flatness of the steel plate in the prior art, the present invention provides a method for secondary straightening to improve the flatness of the X70M pipeline steel plate, which can effectively improve the flatness level of the X70M pipeline steel plate, and at the same time ensure that the performance of the steel plate meets the index requirements
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Embodiment 1
[0022] The production of the steel plate of the present invention adopts the conventional production process, that is, KR desulfurization → converter smelting → LF → RH → CCM → billet cutting to length → slow cooling for 48 hours → slab heating → high pressure water descaling → rolling → water cooling → hot straightening Straightening→flaw detection→cutting→number spraying→physical inspection→warehousing. The steel plate smelting raw material of the present invention includes the following components in percentage content, C: 0.070%, Si: 0.25%, Mn: 1.55%, P≤0.008%, S≤0.001%, Nb: 0.050%, Cr: 0.20%, Mo: 0.15 %, Ti: 0.015%, H: 1ppm, O: 25ppm, N: 30ppm.
[0023] The method for improving the flatness of X70M pipeline steel plate by secondary straightening in the present invention is that the steel plate after heat straightening is heated in a heat treatment furnace, the heating temperature is 520°C, and the heating time is 30 minutes. After heating, the steel plate enters the strai...
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Abstract
The invention relates to the technical field of metallurgy, in particular to a method for improving the straightness of an X70M pipeline steel plate through secondary straightening, namely, the steel plate subjected to hot straightening enters a heat treatment furnace to be heated, the heating temperature ranges from 500 DEG C to 540 DEG C, the heating time ranges from 25 min to 35 min, the heated steel plate enters a straightening machine to be subjected to secondary straightening, and the straightening temperature is set to be 420 DEG C to 470 DEG C. The steel plate subjected to hot straightening enters the heat treatment furnace to be subjected to heating treatment, the heating temperature is lower than the bainite transformation ending temperature, and the influence of secondary heating on the strength of the steel plate is reduced; after being heated, the steel plate enters a straightening machine to be secondarily straightened, the straightening temperature is lower than the bainite transformation ending temperature, the deformation resistance of the steel plate can be effectively reduced through temperature straightening, and after the steel plate is gripped by the straightening machine, the steel plate continuously does linear or rotary motion, and finally the straightening purpose is achieved. The straightened steel plate is not deformed again after being cooled to the room temperature, and the unevenness of the steel plate cooled to the room temperature reaches 2 mm / 2 m.
Description
technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for secondary straightening to improve the flatness of X70M pipeline steel plates. Background technique [0002] Pipeline steel refers to a type of steel with special requirements for the manufacture of pipelines for transporting oil and natural gas. ≤22mm X70M has become a popular choice of relevant design institutes. X70M grade pipeline steel requires high strength, low temperature toughness and good crack arrest performance. In order to meet these physical performance indicators, this kind of steel is generally designed with ultra-low carbon composition and produced by TMCP process. Inevitably, when producing thin and wide specifications X70M, due to the inhomogeneity of the temperature of the steel plate after water cooling, the phase transition of the steel plate will be uneven, resulting in different deformation resistances at different positions of the same st...
Claims
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IPC IPC(8): B21D37/16B21D1/02
CPCB21D37/16B21D1/02
Inventor 孔雅李复磊朱士鹏汪鹏飞韩启彪房振业蔡连东
Owner SD STEEL RIZHAO CO LTD