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X80 hot rolled steel plate with good toughness, high strength and low tensile ratio and production method thereof

A low yield ratio, hot-rolled steel plate technology, applied in the direction of temperature control, can solve the problem of low yield ratio, and achieve the effect of low yield ratio, good toughness and high strength

Active Publication Date: 2009-09-30
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a high-strength low-yield ratio X80 hot-rolled steel plate with excellent toughness and its production method, which effectively solves the problem of controlling the strength and toughness of high-grade pipeline steel, so that the strength index, toughness index and yield ratio The indicators meet the standard requirements at the same time, which reduces the economic loss of the manufacturer and improves the safety of the pipeline, which is of great significance to the development of my country's pipeline industry

Method used

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  • X80 hot rolled steel plate with good toughness, high strength and low tensile ratio and production method thereof
  • X80 hot rolled steel plate with good toughness, high strength and low tensile ratio and production method thereof
  • X80 hot rolled steel plate with good toughness, high strength and low tensile ratio and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0010] According to the invention, a high-strength low-yield ratio X80 hot-rolled steel plate with excellent toughness and a production method thereof. It is smelted on a 100-ton converter, and continuously cast into a continuous casting slab of 250mm×1700mm×2850mm, and rolled on a 4300mm wide and thick plate production line. The chemical composition is shown in Table 1, the TMCP process is shown in Table 2, the strength and yield ratio properties are shown in Table 3, the toughness properties are shown in Table 4, and the metallographic structure is shown in Table 4. figure 1 shown.

[0011] The chemical composition (weight, %) of table 1 embodiment 1

[0012] C Si mn P S Alt N Nb+Mo Ni+Cr+Cu 0.043 0.20 1.72 0.009 0.002 0.040 0.004 ≤0.30 ≤0.90

[0013] Table 2 TMCP process system

[0014] Sample

No Sample thickness

Spend heating temperature,

℃ rough and finish rolling,

℃ Rough rolling single pass

Shape...

Embodiment 2

[0021] According to the invention, a high-strength low-yield ratio X80 hot-rolled steel plate with excellent toughness and a production method thereof. It is smelted on a 100-ton converter, and continuously cast into a continuous casting slab of 250mm×1700mm×2850mm, and rolled on a 4300mm wide and thick plate production line. The chemical composition is shown in Table 1, the TMCP process is shown in Table 2, the strength and yield ratio properties are shown in Table 3, the toughness properties are shown in Table 4, and the metallographic structure is shown in Table 4. figure 1 shown.

[0022] The chemical composition (weight, %) of table 1 embodiment 2

[0023] C Si mn P S Alt N Nb+Mo Ni+Cr+Cu 0.048 0.18 1.75 0.009 0.002 0.036 0.0036 ≤0.30 ≤0.90

[0024] Table 2 TMCP process system

[0025] Sample

No Sample thickness

Spend heating temperature,

℃ rough and finish rolling,

℃ Rough rolling single pass

Shap...

Embodiment 3

[0031] According to the invention, a high-strength low-yield ratio X80 hot-rolled steel plate with excellent toughness and a production method thereof. It is smelted on a 100-ton converter, and continuously cast into a continuous casting slab of 250mm×1700mm×2850mm, and rolled on a 4300mm wide and thick plate production line. The chemical composition is shown in Table 1, the TMCP process is shown in Table 2, the strength and yield ratio properties are shown in Table 3, the toughness properties are shown in Table 4, and the metallographic structure is shown in Table 4. figure 1 shown.

[0032] The chemical composition (weight, %) of table 1 embodiment 3

[0033] C Si mn P S Alt N Nb+Mo Ni+Cr+Cu 0.050 0.15 1.70 0.009 0.002 0.035 0.004 ≤0.30 ≤0.90

[0034] Table 2 TMCP process system

[0035] Sample

No Sample thickness

Spend heating temperature,

℃ rough and finish rolling,

℃ Rough rolling single pass

Shape...

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PUM

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Abstract

The invention relates to an X80 hot rolled steel plate with good toughness, high strength and low tensile ratio and a production method thereof, and belongs to the technical field of low-carbon structural steel production. The plate blank comprises the following components: 0.02 to 0.08 percent of C, 0.01 to 0.35 percent of Si, 1.40 to 1.85 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, 0.01 to 0.06 percent of Alt, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H, 0.008 to 0.02 percent of Ti, 0.03 to 0.11 percent of Nb, 0.01 to 0.35 percent of Mo, less than or equal to 0.90 percent of Ni, Cr and Cu complex additive, and the balance of Fe and inevitable impurity elements. The heating temperature of the plate blank is between 1,120 and 1,220 DEG C; a fist stage of controlled rolling is finished in an austenite recrystallization area, the single-pass pressing rate is 15 to 30 percent, and the final rolling temperature is between 960 and 1,080 DEG C; a second stage of controlled rolling is finished in an austenite non-recrystallization area, and the final rolling temperature is between 770 and 830 DEG C; and the rolled steel is cooled to between 450 and 580 DEG C at a speed of 10 to 30 DEG C per second. The steel plate has the advantages of high strength, good toughness and low tensile ratio.

Description

technical field [0001] The invention belongs to the technical field of low-carbon structural steel production, and in particular relates to a high-strength and low-yield-ratio X80 hot-rolled steel plate with excellent toughness and a production method thereof, which are suitable for the production of longitudinal submerged arc welded pipes for transporting oil and natural gas. Background technique [0002] With the start of construction of the national key project "Second West-East Gas Transmission Pipeline Project", major domestic steel mills have started the research and development of high-grade pipeline steel X80. The second line of the West-East Gas Pipeline Project has a total length of 8641Km, a pipe diameter of Φ1219mm, and a delivery pressure of 12MPa. It is currently the largest pipeline project in China with the largest pipe diameter and delivery pressure. Under such large-diameter and high-pressure transportation conditions, the pipeline is prone to rupture, so t...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/38C22C38/28C22C38/16C21D8/02B21B37/74
Inventor 李少坡李家鼎查春和王凤琴丁文华李战军郝宁刘金刚姜中行麻庆申王文军
Owner SHOUGANG CORPORATION
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