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X70 pipeline steel hot-rolled plate roll and production method thereof

A hot-rolled coil and production method technology, applied in the field of iron and steel metallurgy, can solve the problems of high Cr content, increased alloy cost, low temperature, etc., and achieve the effect of high toughness, low cost, and high drop-weight tearing performance

Inactive Publication Date: 2018-01-19
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the Cr content is high, which increases the cost of the alloy. At the same time, the coiling temperature range is 300-400 ° C, and the temperature is low, which increases the difficulty of process control.

Method used

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  • X70 pipeline steel hot-rolled plate roll and production method thereof
  • X70 pipeline steel hot-rolled plate roll and production method thereof
  • X70 pipeline steel hot-rolled plate roll and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]The chemical composition weight percentage of the steel strip is shown in Table 1. The slab heating temperature is 1178°C, and the total time in the furnace is 187min. The first stage of rolling, that is, the rolling in the austenite recrystallization zone, the starting rolling temperature is 1145°C, the reduction rate of the first pass is > 10%, and the reduction rate of the final pass is ≥ 25%. When the thickness of the rolled piece is 40mm When the temperature reaches 930°C on the roller table, the second-stage rolling is carried out, that is, the rolling in the austenite non-recrystallized zone. The final rolling temperature is 828°C. The device is cooled to 470°C at a rate of 20°C / s. Finally, the steel strip can be obtained.

Embodiment 2

[0047] Embodiment is the same as Example 1, wherein the heating temperature is 1172° C., and the total time in the furnace is 186 minutes. The starting temperature of the first stage of rolling is 1150°C, the thickness of the intermediate billet is 40mm, the starting temperature of the second stage of rolling is 925°C, and the final rolling temperature is 826°C. After rolling, the steel strip enters the high-efficiency density layer Flow cooling device, cooling to 485°C at a speed of 18°C / s. Finally, the steel strip can be obtained. The metallographic structure of the steel strip is shown in figure 1 shown, from figure 1 It can be seen that the fine structure of the steel plate is fine and uniform acicular ferrite.

Embodiment 3

[0049] Embodiment is the same as Example 1, wherein the heating temperature is 1176° C., and the total time in the furnace is 189 minutes. The starting temperature of the first stage of rolling is 1155°C, and the thickness of the intermediate billet is 40mm; the starting temperature of the second stage of rolling is 928°C, and the final rolling temperature is 823°C. After rolling, the steel strip enters the high-efficiency dense layer Flow cooling device, cooling to 456°C at a rate of 22°C / s. Finally, the steel strip can be obtained.

[0050] The steel strips of Examples 1-3 of the present invention were tested for mechanical properties, and the test results are shown in Table 2.

[0051] The steel strips of Examples 1-3 of the present invention were inspected for inclusions and grain size, and the inspection results are shown in Table 3.

[0052] Table 1 The chemical composition (wt%) of the steel strips of Examples 1 to 3 of the present invention

[0053] Example...

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Abstract

The invention relates to an X70 pipeline steel hot-rolled plate roll and a production method of the X70 pipeline steel hot-rolled plate roll. The production method comprises the steps of smelting andcontinuous casting, heating and rolling, and cooling, wherein the heating temperature is 1160-1180 DEG C, and the total in-furnace time is larger than or equal to 180 minutes. The rolling is divided into first-stage rolling and second-stage rolling, the first-stage rolling is performed in an austenite recrystallization area, in the rolling process, the rolling-starting temperature is 1140-1160 DEGC, pressing-down rate in first pass is larger than 10%, and the pressing-down rate in final pass is larger than or equal to 25%; the second-stage rolling is performed in an austenite non-recrystallization area, the finish-rolling-starting temperature is less than or equal to 930 DEG C, the final rolling temperature is 810-850 DEG C, the finish-rolling compression ratio is larger than 3, and the accumulated pressing-down rate is larger than or equal to 72%. According to the X70 pipeline steel hot-rolled plate roll and the production method of the X70 pipeline steel hot-rolled plate roll, by means of the reasonable chemical ingredient design and the adoption of the above-mentioned controlled-rolling and controlled-cooling process, the X70 pipeline steel with the microscopic tissue being a thin and uniform needle-shaped ferrite and the grain size being the thirteenth grade is obtained, and the X70 pipeline steel is of high strength, high tenacity and the drop weight tear performance andis low in cost.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a X70 pipeline steel hot-rolled coil and a production method thereof. Background technique [0002] Oil and natural gas is an important strategy and reserve material of the national economy. With the rapid development of the national economy, the demand for energy such as oil and natural gas is increasing. The continuous growth of energy demand, structural adjustment and optimization have driven the oil and gas industry. comprehensive development. Pipeline transportation is an economical, safe and uninterrupted transportation method, which has the advantages of large transportation volume, low cost, high safety, convenience and high efficiency. [0003] With the increasing demand for oil and natural gas, the transmission pressure and pipe diameter of pipelines are also increasing, and the oil and gas transmission steel pipes are also rapidly developing towards high-grade...

Claims

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Application Information

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IPC IPC(8): C22C38/26C22C38/28C22C38/38C22C38/02C22C38/06C21D8/02
Inventor 王少炳王雪莲袁晓鸣袁媛魏慧慧
Owner BAOTOU IRON & STEEL GRP
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