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High-strength container steel plate and preparation method thereof

A high-strength, steel plate technology, applied in the field of low-alloy steel, can solve the problems of user safety production threat, difficulty in manufacturing large-scale steel structures, impact toughness and welding performance decline, etc.

Inactive Publication Date: 2017-04-26
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of traditional low-alloy high-strength steel is that its impact toughness and welding performance decrease significantly while the strength increases, and the sensitivity of welding cracks increases, which brings difficulties to the manufacture of large-scale steel structures and especially threatens the safety of users in production. Therefore, while pursuing high strength, reducing the crack susceptibility of the steel plate is getting more and more attention

Method used

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  • High-strength container steel plate and preparation method thereof
  • High-strength container steel plate and preparation method thereof
  • High-strength container steel plate and preparation method thereof

Examples

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preparation example Construction

[0031] Correspondingly, the present invention also provides a method for preparing the above-mentioned high-strength container steel plate, which includes the following steps:

[0032] Step a, smelting and refining

[0033] Converter smelting uses desulfurized pretreated molten iron and steel scrap as raw materials, single slag smelting, converter tapping temperature is controlled at 1620-1640°C; RH vacuum treatment adopts circular deep degassing process;

[0034] Step b, continuous casting

[0035] It adopts dynamic soft reduction, electromagnetic stirring and optimized secondary cooling water distribution, low superheat and constant casting speed continuous casting process.

[0036] Step c, heating

[0037] The heating temperature is controlled at 1200℃~1220℃, and the total time in the furnace is ≥270min, of which the soaking time is ≥40min;

[0038] Step d, rolling and cooling

[0039] The two-stage TMCP process is adopted for rolling. The starting temperature of the ro...

Embodiment 1

[0051] The raw material molten iron undergoes deep desulfurization of molten iron, top-bottom blowing of converter, argon blowing of ladle, external refining of LF furnace, RH vacuum treatment and continuous casting process to obtain 250mm thick slab with chemical composition weight percentage shown in Table 1. The slab heating temperature is 1202°C, the total time in the furnace is 320min, the rolling start temperature of the first stage is 1180°C, and the relative reduction rate of a single pass is controlled above 20% for at least two passes. When the thickness of the rolled piece is 38mm, the Wait until the temperature reaches 1020°C on the roller table, and then carry out the second-stage rolling. The final rolling temperature is not controlled, and the thickness of the finished steel plate is 12mm. After rolling, the steel plate is air-cooled and enters the hot straightening machine, and the cooling bed is cooled after hot straightening. After the steel plate is shot bla...

Embodiment 2

[0053] The embodiment is the same as in Example 1, wherein the heating temperature is 1210°C, the total time in the furnace is 318min, the rolling start temperature of the first stage rolling is 1183°C, the starting rolling temperature of the second stage rolling is 891°C, and the intermediate billet is left to warm The thickness is 96mm, the final rolling temperature is 835°C, and the thickness of the finished steel plate is 38mm. After rolling, the steel plate enters the accelerated cooling (ACC) device, the cooling rate is 13°C / s, the final cooling temperature is 613°C, and the cooling bed is cooled after hot straightening. After the steel plate is shot blasted, it is sent to the quenching furnace for treatment. The quenching temperature is 920°C, and the time in the furnace is t×1.4min / mm+10min. The tempering temperature is 610°C, and the holding time is t×2.4min / mm+20min, where t is the thickness of the steel plate in mm. Finally, the steel plate can be obtained.

[005...

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Abstract

The invention provides a high-strength container steel plate and a preparation method thereof. The high-strength container steel plate comprises the following chemical components in percentage by weight: 0.06-0.08% of C, 0.20-0.30% of Si, 1.3-1.5% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.035-0.045% of Nb, 0.20-0.30% of Ni, 0.15-0.25% of Cr, 0.15-0.25% of Mo, 0.035-0.045% of V, 0.01-0.02% of Ti and the balance Fe and inevitable impurities. The high-strength container steel plate provided by the invention has tensile strength greater than 610 MPa, and is a low-welding-crack-sensitivity steel plate with good plasticity and excellent low-temperature impact toughness. A final metallographic structure of the steel plate is tempered sorbite and tempered bainite.

Description

technical field [0001] The invention relates to the field of low-alloy steel, in particular to a high-strength container steel plate and a preparation method thereof. Background technique [0002] With the rapid development of energy, petroleum, chemical industry, hydropower and other industries, engineering structures are becoming more and more large-scale and lightweight, and higher requirements are placed on the performance of steel plates, such as large crude oil storage tanks, large spherical tanks, Offshore oil production platforms, long-span bridges, large-scale pipelines, etc. These large-scale engineering structures put forward new requirements for the welding technology of steel plates, that is, steel plates are required to adopt single-sided submerged arc welding, gas-electric welding or electroslag welding, which can greatly improve welding efficiency. Welding with high heat input welding technology has brought new problems to traditional low alloy high strength ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/50C22C38/48C22C38/46C22C38/44C21D8/02C21D1/18
CPCC22C38/04C21D1/18C21D8/0226C21D8/0247C21D2211/002C22C38/02C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 杨雄王雪莲霍培珍温利军吴鹏飞
Owner INNER MONGOLIA BAOTOU STEEL UNION
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