Cu-containing nanophase strengthened easy-to-weld steel and preparation method

Abstract

The invention provides Cu-containing nanophase strengthened easy-to-weld steel and a preparation method. The Cu-containing nanophase strengthened easy-to-weld steel comprises the following components by weight percent: less than 0.05% of C, 0.1-0.3% of Si, 0.5-1.5% of Mn, less than 0.002% of S, less than 0.004% of P, 1.5-2.5% of Cu, 4-8% of Ni, 0.3-0.8% of Al, 0.2-1% of Mo, less than 1% of Cr, 001-0.04% of Nb, 0.01-0.05% of Ti, 0.01-0.08% of V, and the balance of Fe and inevitable impurity elements. The preparation method comprises the following steps: performing induction smelting and casting under argon protection; heating cast ingots at 1,100-1,200 DEG C for 1-3 h, directly performing hot rolling at the initial temperature of 1,050-1,150 DEG C and the final temperature of 950 DEG C, and performing super-speed high-pressure water cooling after final rolling, wherein the hot rolling deformation is 50-90%; and selectively conducting solution and aging heat treatment on a rolled steel plate to obtain high-strength high-toughness easy-to-weld steel. The alloy steel is high in strength, good in plasticity, excellent in low-temperature impact toughness and easy to weld. Besides, the machining process is high in controllability, the cost is low and the operation is simple.

Description

technical field [0001] The invention relates to an easy-weld steel, and the invention also relates to a preparation method of the easy-weld steel. Background technique [0002] Copper-containing nano-phase low-alloy steel has high strength, good ductility, low-temperature impact toughness and easy welding performance, so it has a wide range of applications in the fields of shipbuilding, automobile manufacturing, construction, and bridges . The yield strength of general low-alloy steel is usually lower than 700MPa, and it is difficult to ensure good low-temperature toughness and welding performance while usually having high strength. [0003] Traditional high-strength steels are all martensitic or lower bainite structures with high carbon content, and the introduction of a large amount of carbon elements greatly reduces the welding performance of the material. At the same time, in order to ensure the uniform structure of the core, it is necessary to ensure that the thicker ...

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Problems solved by technology

Its yield strength is 800MPa, but the elongation is only ab

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