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Wide weather-resistant steel for 700 MPa-level hot-rolled container and manufacturing method thereof

A container and weather-resistant steel technology, which is applied in metal rolling, contour control, etc., can solve the problems of high cost of weather-resistant strip steel and users' inability to use it normally, and achieve the effects of excellent corrosion resistance, easy organization of production, and improvement of production efficiency

Active Publication Date: 2020-07-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to overcome the deficiencies in the prior art that the weather-resistant steel strip for 700MPa-level hot-rolled containers is high in cost and cannot be used by users due to warping after opening, and provides a weather-resistant steel for 700MPa-level hot-rolled containers with a wide width and a manufacturing method thereof , to solve the above-mentioned problems existing in the prior art
[0008] Aiming at the prominent technical problem of ship shape warping existing in the current production process of wide 700MPa container steel, the technical proposal of the present invention is specially proposed

Method used

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  • Wide weather-resistant steel for 700 MPa-level hot-rolled container and manufacturing method thereof
  • Wide weather-resistant steel for 700 MPa-level hot-rolled container and manufacturing method thereof

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Embodiment Construction

[0045] The above-mentioned embodiments are only to illustrate the technical concept and features of the present invention, rather than to limit the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

[0046] The chemical composition of embodiment steel has been listed in table 1, and table 2 has listed the heating parameter of embodiment steel slab, and table 3 has listed the rolling process parameter of embodiment steel, and table 4 has listed the temperature of embodiment steel. For mechanical properties, Table 5 shows the atmospheric corrosion resistance of the steels of the examples.

[0047] The example steel with the chemical composition shown in Table 1 is manufactured through the following process: smelting in a con...

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Abstract

The invention discloses wide weather-resistant steel for a 700 MPa-level hot-rolled container and a manufacturing method thereof. The steel contains C: 0.058%-0.078%, Si: 0.65%-0.75%, Mn: 0.65%-0.85%,P: 0.035%-0.045%, S: less than or equal to 0.006%, Al: less than or equal to 0.040%, Cr: 0.22%-0.31%, Cu: 0.11%-0.19%, Ti: 0.060%-0.075%, RE: 0.021%-0.035%, N: less than or equal to 0.005%, and the balance Fe and inevitable impurities. The outlet temperature of a billet soaking section is 1283-1300 DEG C, the holding time is 27-41 min, and the total in-furnace time is less than or equal to 178 min. Rough rolling outlet temperature is greater than or equal to 1100 DEG C, finish rolling start temperature is 1087-1108 DEG C, finish rolling finish temperature is 925-947 DEG C, a billet is cooledto 655-675 DEG C for taking up at a cooling rate of 37-47 DEG C / s, flattening force is 5500-6500 KN, and bending force is 30-40 KN. The flatness of a finished steel sheet after flattening is less thanor equal to 3 mm / m.

Description

technical field [0001] The invention belongs to the field of steel for containers, and relates to a weather-resistant steel for hot-rolled containers with a width of 700 MPa and good flatness. Background technique [0002] The traditional 20-foot and 40-foot ordinary containers use SPA-H with a yield strength of 345MPa, which has low material strength and high consumption. In the field of container manufacturing, my country is gradually promoting the application of 450-700MPa high-strength steel plates. Compared with the steel used in ordinary standard containers, the use of high-strength steel plates can reduce the weight by 15% to 40%, which can save a lot of transportation costs. Due to its special purpose, the container has high requirements on the material of the steel. In addition to having good atmospheric corrosion resistance and high plasticity, the flatness of the steel strip after flattening is better, especially for the steel with a higher strength level. If th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/28B21B1/22B21B37/28B21B37/44
CPCB21B1/22B21B37/28B21B37/44C22C38/002C22C38/005C22C38/02C22C38/04C22C38/20C22C38/28
Inventor 刘志伟孙傲张瑞琦王杰郭晓宏李江委徐立家高磊乔磊杨玉
Owner ANGANG STEEL CO LTD
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