Steel-aluminum compound hot rolled steel with tensile strength of 340MPa and production method thereof

Abstract

The invention relates to steel for parts with high requirements on thermal conductivity, such as radiators and the like used by power plants of 0.3 million kilowatts and above. The steel comprises the following components by weight percentage: 0.010-0.014% of C, less than 0.018% of Si, 0.30-0.35% of Mn, 0.001-0.002% of Al, not more than 0.02% of P, less than 0.06% of S and not more than 0.003% of O. The steps are as follows: carrying out desulfurization on molten iron; refining outside a furnace; carrying out continuous casting, and adopting a covering agent with 0.5% of C and argon for protecting pouring; heating a continuous casting slab to 1200-1218 DEG C; carrying out hot rolling, and controlling the final rolling temperature to be 870-888 DEG C; and coiling and controlling the temperature to be 610-629 DEG C. The steel can ensure the plasticity of the radiators used by the power plants of 0.3 million kilowatts and above; a compound layer does not form Fe-Al brittle phase and has good compound performance; and the steel can lead the rigidity of the radiator to be high and ensure the stability of the shape and the size of the processed heat exchanger.

Description

technical field [0001] The invention relates to steel for heat exchangers, especially suitable for low-carbon, ultra-low-aluminum, and ultra-low-oxygen radiators with a tensile strength of 340 MPa and an elongation of more than 41% for power stations of 300,000 kilowatts and above. Parts are made of hot-rolled steel. Background technique [0002] The traditional low-carbon steel or ultra-low carbon steel for steel-aluminum composite mainly has problems such as high aluminum content and high oxygen content, which lead to low performance of steel-aluminum composite and affect the normal use of materials. [0003] In the prior art, there are precious metal nickel elements added, and steel-aluminum alloy materials are also available, but the steel base is selected with high manganese or high copper content. The disadvantage is that the cost is high and the production process is relatively complicated. [0004] The Japanese patent document with the patent number JP 2005161383 di...

AI Technical Summary

Problems solved by technology

[0002] The traditional low-carbon steel or ultra-low carbon steel for steel-aluminum composite mainly has problems such as high aluminum content and high oxygen content, which lead to low performance of steel-aluminum composite and affect the normal use of materials

[0003] In the prior art, there are precious metal nickel elements added, and there are also steel-aluminum alloy materials, but the steel base is made of high manganese or high copper content. The disadvantage is that the cost is high and the production process is relatively complicated.

[0004] The Japanese patent document with the patent number JP 2005161383 discloses an invention in which a board is double-sided composite, wherein one side of the board is steel-aluminum composite, and the other side is steel-aluminum-zinc composite, and the steel base also contains Zirconium or magnesium, nickel, its deficiency adds more alloying elements, and the production cost is higher

Images