High-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for railway freight open wagon and production technology of high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for railway freight open wagon

Abstract

The invention discloses high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for a railway freight open wagon and a production technology of the high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for the railway freight open wagon, and belongs to the technical field of steel rolling production. The cap-shaped steel comprises the following components in percentage by mass: 0.10 to 0.15 percent of C, 0.20 to 0.65 percent of Si, 1.40 to 1.55 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.3 to 1.0 percent of Cr, 0.025 to 0.065 percent of Ni, 0.30 to 0.55 percent of Cu, 0.030 to 0.045 percent of Nb, less than or equal to 0.0002 percent of H, less than or equal to 0.008 percent of N, 0.020 to 0.040 percent of Alt and the balance Fe and trace residual elements. The preparation technology of the high-strength weather-resistant low-temperature-resistant hot-rolled cap-shaped steel used for the railway freight open wagon comprises the steps of blast furnace molten iron production, molten iron pretreatment, converter smelting, argon blowing, LF refining, RH refining, continuous casting full-protection casting, cap-shaped steel rolling and cap-shaped steel straightening. The cap-shaped steel has excellent appearance quality, strength, weather resistance and low temperature resistance at the same time, and the use requirements of the cap-shaped steel in the railway freight open wagon are effectively met so that the safety of the whole wagon can be improved, and the cap-shaped steel has high economic benefits.

Description

Technical field

[0001] The present invention belongs to the technical field of production rolling, and more particularly, to a weather-resistant high-strength low-temperature hot-rolled railway freight wagons steel cap and its production process. Background technique

[0002] Railway freight gondola is an important freight transport, mainly used for shipping coal, sand and gravel, granular cargo, container cargo, with its vehicle chassis load-bearing steel beams for the cap, the current rail freight gondola in the main beam cold bending or hot rolled steel cap b word Larry welded steel. Using roll-formed steel cap, the internal stress of the corner portion is large, and requires cutting a plate material cutting, complicated process is complicated, labor-intensive cost. Hot-rolled steel Larry B word cap welded steel, the fatigue resistance properties of the weld area of ​​the dynamic load decreases, and the dynamic load in the railway freight wagons during transport of long, so th...

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