Steel-aluminum compound hot rolled steel with tensile strength of 310MPa and production method thereof

Abstract

The invention relates to hot rolled steel for radiators of central air conditioners. The hot rolled steel comprises the following components by weight percentage: 0.004-0.006% of C, less than 0.015% of Si, 0.25-0.35% of Mn, 0.0021-0.0030% of Al, not more than 0.022% of P, less than 0.006% of S, not more than 0.003% of O and the balance of Fe and inevitable impurities. 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 0.1% of C and argon for protecting pouring; heating a continuous casting slab to 1220-1238 DEG C; controlling the final rolling temperature of hot rolling to be 890-908 DEG C; and coiling and controlling the temperature to be 630-649 DEG C. The hot rolled steelcan replace an aluminum alloy plate heat exchanger of the central air conditioner, the production cost is low, and the hot rolled steel can lead the rigidity of the heat exchanger to be high and ensure the stability of the shape and the size of the heat exchanger.

Description

technical field [0001] The invention relates to steel for heat exchangers, especially suitable for heat exchangers with ultra-low carbon, ultra-low aluminum, and ultra-low oxygen characteristics of central air-conditioning, such as heat exchangers with a tensile strength of 310 MPa and an elongation of more than 46%. With 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 ...

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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

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