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Rolling process of Ti-containing low alloy steel

A low-alloy steel and process technology, which is applied in the field of Ti-containing low-alloy steel rolling process, can solve problems such as difficult plate shape control, cracking of coiled pipes, and large thermal stress, and achieves small performance fluctuation range, reduced maintenance costs, and good performance. The effect of welding performance

Active Publication Date: 2020-09-11
HEBEI PUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The main defects of the Ti-containing low-alloy medium and thick plate produced by the TMCP process in the prior art are: the finishing rolling temperature of the thin steel plate is low, resulting in low yield strength of the steel plate; Production of waste products; temperature control of the intermediate billet, low hourly output of the rolling mill; high ACC cooling rate and low reddening temperature, the steel plate produces granular bainite structure, resulting in a large number of unqualified elongation of the steel plate, and a large number of cracks in the cold bending of the steel plate; the steel plate is straightened by ACC Finally, the bainite phase transformation on the surface of the steel plate deforms and drifts when the cooling bed is in progress; the high dislocation density of the steel plate and the large thermal stress cause large internal stress, warpage occurs after cutting, and the steel plate bends and brittle fractures; Poor shape, warpage after cutting, bending cracking and brittle fracture, and tube coil cracking cause a lot of quality objections; after the steel plate is produced by TMCP process, uneven cooling causes unstable performance, especially unstable impact value
Therefore, due to the above defects, the production steel plants basically do not produce low-cost Ti-containing low-alloy medium and heavy plates.

Method used

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  • Rolling process of Ti-containing low alloy steel
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  • Rolling process of Ti-containing low alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The rolling process includes the following steps:

[0042] 1. The steelmaking process produces suitable slabs;

[0043] 2. The slab in step 1 is directly heated at high temperature, and the high temperature heating is divided into three sections, the heating section is 1260°C, the soaking section is 1240°C, the furnace core temperature is 1240°C, the heating rate is 6min / cm, and the total time in the furnace is 3h;

[0044] 3. Rough rolling is carried out on the slab heated at high temperature in step 2. The rough rolling is rapid rolling at high temperature and high pressure. The maximum pass reduction is selected for the formulation of the reduction program, and the maximum pass reduction rate reaches more than 20%, and the rolling is started. The temperature is 1150°C, and the final rolling temperature is 1080°C;

[0045] 4. Finish rolling the slab after the rough rolling in step 3, the cumulative reduction rate of the finishing rolling is greater than 60%, the redu...

Embodiment 2

[0050] The rolling process includes the following steps:

[0051] 1. The steelmaking process produces suitable slabs;

[0052] 2. The slab in step 1 is directly heated at high temperature. The high temperature heating is divided into three sections. The heating section is 1300°C, the soaking section is 1280°C, the furnace core temperature is 1260°C, the heating speed is 8min / cm, and the total time in the furnace is 3.8h ;

[0053] 3. Rough rolling is carried out on the slab heated at high temperature in step 2. The rough rolling is rapid rolling at high temperature and high pressure. The maximum pass reduction is selected for the formulation of the reduction program, and the maximum pass reduction rate reaches more than 20%, and the rolling is started. The temperature is 1180°C, and the final rolling temperature is 1150°C;

[0054] 4. Finish rolling the slab after the rough rolling in step 3, the cumulative reduction rate of the finishing rolling is greater than 60%, the red...

Embodiment 3

[0059] The rolling process includes the following steps:

[0060] 1. The steelmaking process produces suitable slabs;

[0061] 2. The slab in step 1 is directly heated at high temperature. The high temperature heating is divided into three sections, the heating section is 1280°C, the soaking section is 1260°C, the furnace core temperature is 1250°C, the heating rate is 7min / cm, and the total time in the furnace is 5h;

[0062] 3. Rough rolling is carried out on the slab heated at high temperature in step 2. The rough rolling is rapid rolling at high temperature and high pressure. The maximum pass reduction is selected for the formulation of the reduction program, and the maximum pass reduction rate reaches more than 20%, and the rolling is started. The temperature is 1170°C, and the final rolling temperature is 1100°C;

[0063] 4. Finish rolling the slab after the rough rolling in step 3, the cumulative reduction rate of the finishing rolling is greater than 60%, the reductio...

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Abstract

The invention relates to a rolling process of Ti-containing low alloy steel. The steel comprises the following components in percent by mass: 0.13-0.15% of C, 0.20-0.40% of Si, 0.70-0.90% of Mn, lessthan or equal to 0.020% of P, less than or equal to 0.020% of S, 0.003-0.020% of Al, 0.045-0.065% of Ti, less than or equal to 0.30% of CEV and the balance Fe and inevitable impurity elements. The rolling process comprises the following steps of S1, producing a proper slab in a steelmaking step; S2, directly heating the slab in the step 1 at a high temperature; S3, roughly rolling the slab heatedat the high temperature in the step 2; S4, carrying out finish rolling on the roughly rolled slab in the step 3; S5, carrying out ultra fast cooling on the slab after finish rolling in the step 4; andS6, cooling the slab to 800-820 DEG C in the step 5 and carrying out air cooling on the slab. The rolling process overcomes the defects in the prior art and meets the demand of steel rolling production of a low cost low alloy steel plate.

Description

technical field [0001] The invention relates to a rolling process of Ti-containing low-alloy steel, which belongs to the technical field of steelmaking. Background technique [0002] Q355 and Q235 series steels are currently the most used in actual use, especially the low-alloy steel Q355 series (Q345 series in the original GB / T1591-2008) steel mills use Ti and Nb microalloying supplemented by suitable rolling in production. The manufacturing process produces qualified products, which greatly reduces the production cost. [0003] The main process of rolling Ti-containing steel is heating-rough rolling-finish rolling-controlled cooling and other basic processes. [0004] Ti exists in two forms in steel: TiN and TiC. TiN is formed in the solidification stage of molten steel and is actually insoluble in austenite. TiN does not decompose and precipitate during the heating and cooling process of steel, so it can control the crystallization in the heating process of steel and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21D8/02C21D11/00
CPCC21D8/0205C21D8/0221C21D8/0247C21D11/00C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 杨云清郭龙鑫郭恩元关秀格郭延生陈科晓庞洪轩陈建超郑磊付中原左帅卢凤飞刘明生郭海冰刘柱和珍宝李占强郭潇
Owner HEBEI PUYANG IRON & STEEL
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