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Rare earth (RE) processed high strength high toughness corrosion resistant steel plate and preparation method thereof

A high-strength, high-toughness, corrosion-resistant steel plate technology, applied in the field of high-strength, high-toughness, corrosion-resistant steel plate, can solve problems that do not involve steel corrosion resistance, and achieve the effect of reducing C content, reducing alloy cost, and less alloying element content

Inactive Publication Date: 2012-02-29
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The steel grades disclosed above have obtained a matrix structure dominated by bainite, and obtained high strength, high plasticity and toughness, but the disadvantage is that the corrosion resistance of the steel is not involved

Method used

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  • Rare earth (RE) processed high strength high toughness corrosion resistant steel plate and preparation method thereof
  • Rare earth (RE) processed high strength high toughness corrosion resistant steel plate and preparation method thereof
  • Rare earth (RE) processed high strength high toughness corrosion resistant steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Smelt according to the chemical composition shown in Table 1, and cast into steel ingots, heat the steel ingots to 1220°C, keep them warm for 150 minutes, and carry out the first-stage rolling on the experimental rolling mill, the rolling temperature is 1170°C, at least 1-2 passes The secondary reduction rate is controlled at 20-40%. When the thickness of the rolled piece is 30mm, the temperature on the roller table is 920°C, and then the second stage of rolling is carried out. The final rolling temperature is 840°C, and the thickness of the finished steel plate is 12mm. After rolling, the steel plate enters the accelerated cooling (ACC) device and is cooled to 530°C at a rate of 25°C / s, and the cooling bed is cooled after the water exits.

Embodiment 2

[0031]The embodiment is the same as in Example 1, wherein the heating temperature is 1200° C., and the heat preservation is 150 minutes. The rolling start temperature of the first stage rolling is 1160° C., the thickness of the rolled piece is 36 mm, and the rolling start temperature of the second stage rolling is 910° C. The final rolling temperature is 830°C, the thickness of the finished steel plate is 12mm; the cooling rate of the steel plate is 25°C / s, and the final cooling temperature is 500°C.

Embodiment 3

[0033] The implementation is the same as in Example 1, wherein the heating temperature is 1200° C., and the heat preservation is 150 minutes; the rolling start temperature of the first stage rolling is 1150° C., and the thickness of the rolled piece is 36 mm; the rolling start temperature of the second stage rolling is 910° C., The final rolling temperature is 820°C, the thickness of the finished steel plate is 12mm; the cooling rate of the steel plate is 27°C / s, and the final cooling temperature is 480°C.

[0034] The chemical composition (wt %) of the embodiment of the present invention 1-3 of table 1

[0035]

[0036] The steel plates of Examples 1-3 of the present invention were tested for mechanical properties, and the test results are shown in Table 2; the HIC and SSC test results are shown in Table 3.

[0037] The mechanical property of the steel plate of table 2 embodiment 1-3 of the present invention

[0038] Example

R p0.2 (MPa)

Rm(MPa)

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Abstract

The invention which relates to an RE processed high strength high toughness corrosion resistant steel plate and a preparation method thereof belongs to the field of low alloy high strength steels. The steel plate is characterized in that: the steel plate comprises the following chemical components, by weight, 0.04-0.09% of C, 0.25-0.50% of Si, 1.4-1.7% of Mn, equal to or less than 0.020% of P, equal to or less than 0.010% of S, equal to or less than 0.45% of Cr, equal to or less than 0.20% of Mo, 0.04-0.05% of Nb, 0.005-0.020% of Ti, 0.0005-0.0025% of B, equal to or less than 0.0250% of RE (Ce), and the balance Fe and avoidless impurities. The chemical components are smelted and are casted into ingots, and the method for preparing the steel plate from the ingots comprises the following steps: 1, heating to 1180-1220DEG C and insulating for 120-180min; 2, carrying out first-phase rolling in an austenite recrystallization zone, and carrying out second-phase rolling in an austenite unrecrystallization zone with a finish rolling temperature of 810-840DEG C; and 3, carrying out air cooling after removing from water. By processing with a rare earth in the invention, a matrix tissue based on refined bainite is obtained, so the steel plate has good coupling of the strength, the plasticity and the toughness, and simultaneously has good HIC and SSC corrosion resistances.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel, in particular to a rare-earth-treated high-strength, high-toughness, corrosion-resistant steel plate. Background technique [0002] With the development of construction machinery and coal mining machinery in the direction of large-scale equipment, light weight, and heavy loads, the amount of high-strength steel plates is increasing, and the strength level is also increasing rapidly. At the same time, complex operating conditions require not only The steel plate has high strength and high toughness, and the steel plate is also required to have good corrosion resistance. [0003] Chinese patent CN1218115 discloses "copper-boron low-carbon and ultra-low-carbon bainite high-strength steel". and other elements to promote bainite phase transformation, and at the same time use ε-Cu and Nb, Ti composite precipitation to obtain high strength; another example is Chinese patent CN1280206 which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 杨雄王海明温利军张辉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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