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600MPa level hot rolling thin steel plate and manufacturing method thereof

A technology of hot-rolled thin steel plate and manufacturing method, which is applied in metal rolling, temperature control, etc., can solve the problems of no production technology, etc., and achieve the effects of reducing transportation costs, strong compression resistance, and reducing production costs

Inactive Publication Date: 2009-10-07
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] As mentioned above, the expected yield strength is above 600MPa, the elongation is high, the cold-bending formability is good, and the special steel plate with atmospheric corrosion resistance is cheap and suitable for container manufacturing. In the past, there has been no more suitable production technology.

Method used

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  • 600MPa level hot rolling thin steel plate and manufacturing method thereof
  • 600MPa level hot rolling thin steel plate and manufacturing method thereof
  • 600MPa level hot rolling thin steel plate and manufacturing method thereof

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Embodiment Construction

[0038] Introduce the specific embodiment of the present invention below

[0039] The weight percentage of steel chemical composition of the present invention is:

[0040] C: 0.02% to 0.09%, Si: 0.01% to 0.35%, Mn: 0.20% to 0.90%, P: 0.04% or less, S: 0.005% or less, Ni: 0.20% or less, Cu: 0.2% to 0.4%, Cr: 0.30% to 0.45%, Als: 0.005% to 0.050%, Ca: 0.0005% to 0.005%, Ti: 0.02% to 0.15%, and contains Nb: 0% to 0.070%, Bs: 0% to 0.003% One or more, the balance is Fe and unavoidable impurities.

[0041] After the steel with the above chemical composition is continuously cast into a slab with a thickness of 120-300mm, the production process is characterized by rough rolling at a temperature higher than 1040°C after being uniformly heated at 1260-1200°C. Finish rolling starts at 1100-1000°C, ends rolling at 950-880°C, and coils at 550-650°C after cooling at a cooling rate of 20°C / s or more within 10s after rolling.

[0042] Tables 1 to 3 are several examples produced according t...

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Abstract

The invention discloses a 600MPa level hot rolling thin steel plate and a manufacturing method thereof. The steel plate comprises the following chemical compositions by weight percentage: 0.02-0.09 of C, 0.01-0.35 of Si, 0.20-0.90 of Mn, lower than 0.04 of P, lower than 0.005 of S, lower than 0.20 of Ni, 0.2-0.4 of Cu, 0.30-0.45 of Cr, 0.005-0.050 of Als, 0.0005-0.005 of Ca and 0.02-0.15 of Ti, one or more than one types of 0-0.070 of Nb and 0-0.003 of Bs, the balance of Fe and inevitable impurities. The steel is continuously cast into plate blanks of 120-300mm; then the obtained plate blanks are heated uniformly at the temperature of 1260 DEG C-1200 DEG C, is roughly rolled in the range of higher than 1040 DEG C, starts to finishing rolling at the temperature of 1100 DEG C-1000 DEG C, ends rolling at the temperature of 950 DEG C-880 DEG C, is cooled at the cooling speed of 20 DEG C / s in 10s after rolling and is reeled up at the temperature of 550 DEG C-650 DEG C. The weight of a container manufactured by the steel plate is reduced by 15-40 percent, therefore, the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel, and in particular relates to a low-cost, high-strength 600MPa hot-rolled thin steel plate and a manufacturing method thereof. Background technique [0002] In the container manufacturing industry, 345MPa-grade hot-rolled thin steel plates (high weather-resistant steel plates) with atmospheric corrosion resistance (high weather-resistant steel plates) with Cu, P, Cr, and Ni as the main alloy components are generally used to manufacture outer plates and inner frames. The strength of the container is low, and a thicker size must be used in order to meet the design requirements, which will increase the weight of the container itself and increase the cost. The steel plate used for container manufacturing has reached more than 3 million tons, and with the development of the container transportation industry, the amount of steel required by this industry is also increasing year by year. As peop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54B21B1/46B21B37/74
Inventor 王东明刘凤莲郭晓宏董恩龙刘志伟谷春阳朱克永
Owner ANGANG STEEL CO LTD
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