A high-strength high-low temperature impact toughness alloy and its preparation and heat treatment process

Abstract

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. It solves the problem of small improvement of low-temperature impact toughness of steel in the prior art. The main point of the technical solution is a high-strength high-low temperature impact toughness alloy, including the following components: Ni0.10‑0.30wt%; Cr0.10‑ 0.30wt%; Al0.02‑0.10wt%; C0.25‑0.35wt%; Mn1.3‑1.7wt%; Si0.17‑0.37wt%; %; Re0.05‑0.13wt%; the rest is Fe. And through S1: adding other components except Al, C, Re into the wire feeder in proportion, melting at 1400-1600°C for 30-60min, and continuously feeding argon; S2: adding Al, C. Re is added to the molten mixture through wire feeding; S3: continuous casting at 1550-1650°C to make continuous casting slab; S4: rolling the continuous casting slab to round steel at 950°C; S5: round The steel is heat-treated on the rolling mill and cooled to 600-650°C at a cooling rate of 2.5-3°C / S; S6: Put the round steel into the slow cooling pit to cool slowly to 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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