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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

A railway freight and production process technology, applied in the field of rolling steel production, can solve the problems of strength, high weather resistance, poor low temperature resistance, difficult one-time hot rolling forming, complex and cumbersome process, etc., to simplify the rolling production process and improve low temperature toughness , reducing the effect of dynamic recrystallization

Inactive Publication Date: 2021-10-01
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of the hat-shaped steel used in the existing railway freight open car, its strength, high weather resistance, and low temperature resistance are relatively poor, and it is difficult to hot-roll and form it at one time during production, the process is complicated and cumbersome, and the manufacturing cost is relatively high. Provided is a high-strength weather-resistant and low-temperature resistant hot-rolled cap steel for railway freight open car and its production process

Method used

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  • 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
  • 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
  • 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

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Experimental program
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Effect test

Embodiment 1

[0044] A hot rolled steel cap according to the present embodiment, its components in weight percentage: C: 0.12%, Si: 0.45%, Mn: 1.5%, P≤0.020%, S≤0.015%, Cr: 0.7%, Ni : 0.055%, Cu: 0.40%, Nb: 0.035%, H≤0.0002%, N≤0.008%, Alt: 0.030%, the balance being Fe and trace residual elements. Production using the production process of the present invention, wherein control of rolling process parameters as follows:

[0045] BD1 slabbing process parameters for phase control: blank after K, J hole co-rolling of 7 passes, with a total compression ratio of 1.23; when I holes rolling, rolling the compression ratio was 1.36. This BD1 stage control start rolling temperature of 1245 ℃, the final rolling temperature is 1205 ℃.

[0046] BD2 slabbing process parameters for phase control: when the configuration of a hole H through the hole H rolling member rolling pressure value is 60 ~ 65mm, compression ratio of 1.32. Pressure rolling through rolling when G holes, a hole disposed between G 37 ~ 42mm, ...

Embodiment 2

[0052] A hot-rolled steel, which is a hot-rolled steel having a mass percentage: C: 0.1%, Si: 0.65%, Mn: 1.40, p ≤ 0.020%, s ≤ 0.012%, Cr: 0.3%, Ni: 0.065%, Cu: 0.30%, Nb: 0.030%, H ≤ 0.0002%, N ≤ 0.008%, Alt: 0.020%, and the rest is Fe and trace residual elements. The production process of the present invention is carried out, in which the rolling process parameters are controlled as follows:

[0053] The process parameters controlled by the BD1 billed rolling stage are: the blank passes through K, J hole rolling 5, with a total compression ratio of 1.20; when the I hole rolling is performed, the compression ratio of the rolling member is 1.36. The opening temperature of this BD1 stage was 1241 ° C, and the final rolling temperature was 1206 ° C.

[0054] The process parameters controlled by the BD2 billet rolling stage are: the pressure value configured to the H hole is 65 mm when rolled by the H hole rolling, and the compression ratio is 1.35. When rolling is rolled by the G ho...

Embodiment 3

[0060] A hot-rolled steel, which is: 0.20%, Mn: 1.55%, p ≤ 0.020%, s ≤ 0.015%, CR: 1.0%, Ni : 0.025%, Cu: 0.55%, Nb: 0.045%, H ≤ 0.0002%, N ≤ 0.008%, Alt: 0.040%, the rest is Fe and trace residual elements. The production process of the present invention is carried out, in which the rolling process parameters are controlled as follows:

[0061] The process parameters controlled by the BD1 billed rolling phase are: the blank passes through K, J hole rolling 6, with a total compression ratio of 1.25; when the I hole rolling is performed, the compression ratio of the rolling member is 1.31. The BD1 stage is 1241 ° C, and the final rolling temperature is 1210 ° C.

[0062] The process parameters controlled by the BD2 billet rolling stage are: the pressure value configured to the H hole is 60 mm when the rolling is rolled, and the compression ratio is 1.30. When the rolling is rolled, the compression ratio is 1.27. This BD1 stage is 1205 ° C, and the final rolling temperature is 1164 °...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/48C22C38/42C22C38/06C21D8/00B21B1/46B21B15/00B21B37/00B21B37/48B21B37/74
CPCC22C38/02C22C38/04C22C38/58C22C38/48C22C38/42C22C38/06C21D8/005B21B1/463B21B15/00B21B37/00B21B37/74B21B37/48C21D2211/005C21D2211/009B21B2015/0071B21B2201/06
Inventor 黄琦吴湄庄吴保桥张卫斌张文满丁朝晖彭林邢军夏勐何军委陈辉汪杰沈千成
Owner MAANSHAN IRON & STEEL CO LTD
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