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Thin-specification high-strength container plate and preparation method thereof

A container, thin gauge technology, applied in metal rolling, manufacturing tools, temperature control, etc., can solve the problem of high cost, achieve good mechanical properties, reduce manufacturing costs, and increase strength increments

Active Publication Date: 2020-12-22
湖南华菱涟钢特种新材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present application is to provide a thin-gauge high-strength container plate and its preparation method to solve the technical problem of adding a large amount of expensive Cu and Ni corrosion-resistant alloy elements to the thin-gauge high-strength container plate in the prior art and the cost is high

Method used

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  • Thin-specification high-strength container plate and preparation method thereof
  • Thin-specification high-strength container plate and preparation method thereof
  • Thin-specification high-strength container plate and preparation method thereof

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preparation example Construction

[0034] The present application also provides a method for preparing a thin-gauge high-strength container plate, comprising the following steps:

[0035] The steel slab with the above composition is heated, the furnace temperature in the soaking furnace or the first 4 zones of the heating furnace is controlled at 1200-1300 °C, the air excess coefficient of the heating furnace is 0.95-1.02, the temperature of the steel billet is 1150-1200 °C, and in the furnace The time is more than 30 minutes;

[0036] The heated steel billet is continuously rolled to obtain a steel plate, and coiled to obtain a steel coil; the initial rolling temperature of the continuous rolling is 1130-1160°C, and the final rolling temperature is 820-920°C.

[0037] Steel billets can be prepared by various methods, such as desulfurization pretreatment of blast furnace molten iron, the desulfurization pretreated blast furnace molten iron is mixed into oxygen top-bottom composite blowing converter (such as 100...

Embodiment 1

[0051] The smelted molten steel (the chemical composition weight percentage of molten steel is: C: 0.055%, Si: 0.35%, Mn: 0.96%, P: 0.008%, S: 0.003%, Cr: 0.46%, V: 0.035%, Ti : 0.12%, the balance is Fe and unavoidable impurity elements), cast into a 60mm thick slab, the continuous casting casting speed is 4.1m / min, the slab entering furnace temperature is 930°C, and the slab is sent into the tunnel heating furnace Heating; where the temperatures in zones 1-7 of the heating furnace are 1250°C, 1265°C, 1270°C, 1255°C, 1230°C, 1230°C, 1235°C respectively, the slab stays in the furnace for 35 minutes; the inlet temperature of the rolling mill is 1160°C, and the finish rolling The outlet temperature is 910°C. After the final rolling, the steel plate is subjected to ultra-rapid cooling at a cooling rate of 100-300°C / S, and then the steel plate is cooled to 620°C in a laminar flow cooling method of 10-25°C / s for coiling, and finally rolled into High-strength steel plate with a thick...

Embodiment 2

[0053] The smelted molten steel (the chemical composition weight percentage of molten steel is: C: 0.06%, Si: 0.39%, Mn: 0.94%, P: 0.009%, S: 0.003%, Cr: 0.52%, V: 0.037%, Ti : 0.11%, the balance is Fe and unavoidable impurity elements), cast into a slab with a thickness of 70mm, the continuous casting speed is 4.0m / min, the temperature of the slab into the furnace is 930°C, and the slab is sent into the tunnel for heating The furnace is heated; the temperatures in zones 1-7 of the heating furnace are 1250°C, 1265°C, 1270°C, 1255°C, 1230°C, 1230°C, and 1235°C respectively, and the slab stays in the furnace for 40 minutes; the inlet temperature of the rolling mill is 1170°C, and the precision The temperature at the exit of rolling is 880°C. After the final rolling, the steel plate is subjected to ultra-rapid cooling at a cooling rate of 100-300°C / S, and then the steel plate is cooled to 600°C by laminar cooling at 10-25°C / s for coiling, and finally rolled. It is made into a hig...

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Abstract

An embodiment of the invention provides a thin-specification high-strength container plate, which comprises the following components in percentage by mass: 0.050-0.065% of C, 0.30-0.40% of Si, 0.90-1.0% of Mn, 0.11-0.13% of Ti, 0.40-0.60% of Cr, 0.030-0.050% of V, less than or equal to 0.004% of S, less than or equal to 0.018% of P and the balance of Fe and other inevitable impurities. According to the thin-specification high-strength container plate, the composition elements do not contain precious Nb, Mo, Cu and other alloy elements, and the V element replaces the Nb element, so that the manufacturing cost of steel can be greatly reduced. The trace V can act together with Ti and Cr elements to form a fine (TiCrV) (CN) M (CN) precipitate with the particle size of 10 nm or less, so that the strength increment is greatly increased.

Description

technical field [0001] The present application relates to the technical field of container boards, and more specifically, relates to a thin-gauge high-strength container board and a preparation method thereof. Background technique [0002] As a major product in hot-rolled commodity coils, container plate has an annual demand of about several million tons. Its notable features are thin specifications, high strength and high weather resistance. The thinnest commonly used specification thickness is 1.6mm, accounting for about The ratio is 16%, and the tensile strength is required to be greater than 490MPa. Compared with ordinary carbon steel Q235B, the relative corrosion rate of 72h cycle infiltration corrosion is less than 60%. In order to ensure the strength properties of the steel, a large amount of expensive Nb, Mo and Cu alloying elements are added, which also significantly increases the alloy cost. Therefore, it is of great significance to carry out the research on the p...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/28C22C33/04B21B37/74B21B45/08
CPCC22C38/02C22C38/04C22C38/28C22C38/24C22C38/002C22C33/04B21B37/74B21B45/08
Inventor 梁亮严立新李光辉胡大董常福汪宏兵郑庆李丹吴浩鸿朱晔熊维亮张王辉
Owner 湖南华菱涟钢特种新材料有限公司
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