High-strength high and low-temperature impact toughness alloy and preparation and heat treatment technology thereof

Abstract

The invention relates to the field of impact-resistant alloys, in particular to a high-strength high and low-temperature impact toughness alloy and a preparation and heat treatment technology thereof,which solve the problem of lower increasing of low-temperature impact toughness of steel products in the prior art. The high-strength high and low-temperature impact toughness alloy is technically characterized by comprising the following components of 0.10 to 0.30wt% of Ni, 0.10 to 0.30wt% of Cr, 0.02 to 0.10wt% of Al, 0.25 to 0.35wt% of C, 1.3 to 1.7% of Mn, 0.17 to 0.37% of Si 0.05 to 0.24wt%of Mo, 0.05 to 0.24wt% of V, 0.05 to 0.13wt% of Re, and the balance of Fe. The preparation and heat treatment technology comprises the following steps of S1, feeding the components (except Al, C and Re) into a feeding machine according to a ratio, smelting at the temperature of 1400 to 1600 DEG C, smelting for 30 to 60min, and continuously leading argon gas; S2, adding the Al, C and Re into the melted mixture through feeding treatment; S3, continuously casting at the temperature of 1550 to 1650 DEG C, and preparing into a continuous casting billet; S4, rolling the continuous casting billet into round steel at the temperature of 950 DEG C; S5, performing heat treatment on the round steel on a rolling mill, and cooling to the temperature of 600 to 650 DEG C at the cooling rate of 2.5 to 3 DEG C / S; S6, putting the round steel into a slow cooling pit, and slowly cooling to the room temperature.

Description

technical field [0001] The invention relates to the field of impact-resistant alloys, in particular to a high-strength high-low temperature impact toughness alloy and its preparation and heat treatment process. Background technique [0002] In the field of modern building construction, embedded parts made of Q235B steel are often used. The embedded parts made of ordinary steel have good structural strength at room temperature. However, in winter, especially in northern China, The outdoor temperature is often lower than -20°C or even -30°C. At such a low temperature, the impact toughness of ordinary steel will be transformed into brittleness and damage will occur, which will greatly reduce the impact toughness of the embedded parts and bring great safety hazards to the construction. [0003] In the Chinese invention patent whose application publication number is CN106834636A, a heat treatment process for improving the strength and low-temperature impact toughness of corrosio...

AI Technical Summary

Problems solved by technology

At such a low temperature, ordinary steel will change from impact toughness to brittleness and be damaged, which will greatly reduce the impact toughness of embedded parts and bring great safety hazards to construction.

[0003] In the Chinese invention patent whose application publication number is CN106834636A, a heat treatment process for improving the strength and low-temperature impact toughness of corrosion-resistant steel castings is disclosed. Although the low-temperature impact toughness of steel is improved to a certain extent, only from the heat treatment process There is still a lot of research space for improving the impact toughness of steel at low temperature.

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