A kind of cu-containing nano-phase strengthened easy-weld steel and its preparation method

An easy-to-weld, nano-phase technology, applied in the field of easy-to-weld steel, can solve the problems of unexplained low-temperature toughness, etc., and achieve the effects of not being prone to cold cracking, fast processing speed, and expanding the operating range

Active Publication Date: 2018-04-24
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its yield strength is 800MPa, but the elongation is only about 20%, and the low temperature toughness is not explained

Method used

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  • A kind of cu-containing nano-phase strengthened easy-weld steel and its preparation method
  • A kind of cu-containing nano-phase strengthened easy-weld steel and its preparation method
  • A kind of cu-containing nano-phase strengthened easy-weld steel and its preparation method

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Embodiment 1

[0033] This embodiment is a high-strength, high-toughness low-alloy steel containing Cu nanophase and its preparation method. The chemical composition (mass percentage) of the alloy is: Cfigure 1 , and its mechanical properties are shown in Table 1

Embodiment 2

[0035]This embodiment is a high-strength, high-toughness low-alloy steel containing Cu nanophase and its preparation method. The chemical composition (mass percentage) of the alloy is: C figure 2 , and its mechanical properties are shown in Table 1

Embodiment 3

[0037] This embodiment is a high-strength, high-toughness low-alloy steel containing Cu nanophase and its preparation method. The chemical composition (mass percentage) of the alloy is: C image 3 , and its mechanical properties are shown in Table 1

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Abstract

The invention provides a Cu-containing nano-phase strengthened easy-weld steel and a preparation method thereof. The weight percent composition is: C<0.05, Si:0.1~0.3, Mn:0.5~1.5, S<0.002, P<0.004, Cu:1.5~2.5, Ni:4~8, Al:0.3~0.8, Mo:0.2 ~1, Cr<1, Nb: 0.01~0.04, Ti: 0.01~0.05, V: 0.01~0.08, and the rest are Fe and unavoidable impurity elements. Induction melting and casting are carried out under argon as a protective gas; the ingot is heated at 1100-1200°C for 1-3h, and then hot-rolled directly. High-pressure water cooling, hot-rolled deformation of 50%-90%; the rolled steel plate is selectively subjected to solution and aging heat treatment to obtain high-strength, high-toughness and easy-to-weld steel. The alloy steel of the invention has high strength, good plasticity, good low temperature impact toughness and easy welding. In addition, the processing technology has high controllability, low cost and simple operation.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C38/48C22C38/46C22C38/44C22C38/42C22C38/06C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C21D8/02
CPCC21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 张中武赵宇
Owner HARBIN ENG UNIV
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