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420MPa-level low-alloy high-intensity ultra-thick steel plate and manufacturing method thereof

A low-alloy high-strength, extra-thick steel plate technology, applied in the field of extra-thick steel plate preparation, can solve the problems of inability to produce thick extra-thick plates, inability to organize mass production, low production efficiency, etc., to eliminate macroscopic and microscopic defects, The effect of mitigating macroscopic and microscopic defects and improving production efficiency

Active Publication Date: 2014-05-07
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as converter smelting-die casting pouring-rolling-heat treatment process route, but limited by technical conditions, continuous casting cannot produce extra-thick plates with excessive thickness
At present, the thickness of the largest converter continuous casting slab in the world is 390mm, but limited by the internal segregation and compression ratio of the converter continuous casting slab, only extra-thick slabs with a thickness less than 100mm can be produced
At present, there are few domestic manufacturers producing steel plates with a thickness of more than 100 mm, and most of them produce high-performance structural steel plates by forging, which cannot organize mass production, and the production efficiency is very low, and the cost of finished products is relatively high.

Method used

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  • 420MPa-level low-alloy high-intensity ultra-thick steel plate and manufacturing method thereof
  • 420MPa-level low-alloy high-intensity ultra-thick steel plate and manufacturing method thereof
  • 420MPa-level low-alloy high-intensity ultra-thick steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]A 420MPa low-alloy high-strength steel plate with a thickness of 160mm, its chemical composition and mass percentage content are shown in Table 1, specifically: C: 0.156%, Si: 0.32%, Mn: 1.52%, P: 0.016%, S: 0.0102 %, Nb: 0.032%, V: 0.040%, Cu: 0.11%, N: 0.0061%, Als: 0.012%, O: 0.0023%, H: 0.00013%, and the balance is Fe and unavoidable impurities. The specific preparation method is as follows:

[0039] (1) According to the predetermined composition, it is smelted in an electric arc furnace, and then refined in a ladle refining furnace. In the ladle refining furnace (LF furnace) treatment, active lime is added to 40Kg / ton of steel for desulfurization and dephosphorization. Calcium silicon powder is added per ton of steel for deoxidation and alloying treatment; then it is treated in a vacuum furnace. The vacuum furnace treatment is as follows: blowing argon gas at 80ml / min, and controlling the vacuum degree to not exceed 67Pa, keeping the vacuum treatment not less than ...

Embodiment 2-4

[0046] With reference to the method of Example 1, each 420MPa level low-alloy high-strength 160mm thick steel plate was prepared according to the chemical composition content design and process conditions of the steel plate in Table 1, Table 3, and Table 5, and the mechanical properties prepared thereby are shown in Table 6. . In addition, the comparison of the internal quality of the billets in Examples 2-4 includes inclusions and gas content inside the billets, as shown in Table 2.

Embodiment 5

[0048] A 420MPa level low-alloy high-strength steel plate with a thickness of 100mm, its chemical composition and mass percentage content are shown in Table 1. The specific preparation method is as follows:

[0049] (1) Smelting in an electric arc furnace according to the predetermined composition, and then refining in a ladle refining furnace. In the ladle refining furnace, active lime is added to 60Kg / ton of steel for desulfurization and dephosphorization, and silicon is added to 0.04Kg / ton of steel. Calcium powder is subjected to deoxidation and alloying treatment; then processed in a vacuum furnace, the vacuum furnace treatment is as follows: according to 100ml / min, argon gas is blown in, and the vacuum degree is controlled to be no more than 67Pa, and the vacuum treatment is kept for no less than 25 minutes; finally The casting speed is controlled at 1.6 to 1.7 m / min for continuous casting to obtain a continuous casting billet of 150mm (thickness) × 150mm (width) × 4500mm...

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Abstract

The invention belongs to the field of ultra-thick steel plate preparation, and in particular relates to a 420MPa-level low-alloy high-intensity ultra-thick steel plate and a manufacturing method thereof. The 420MPa-level low-alloy high-intensity ultra-thick steel plate is characterized by comprising the following chemical components in percentage by mass: 0.13-0.165% of C, 0.28-0.40% of Si, 1.36-1.55% of Mn, less than or equal to 0.020% of P, less than or equal to 0.011% of S, 0.032-0.042% of Nb, 0.032-0.042% of V, less than or equal to 0.13% of Cu, less than or equal to 0.007% of N, 0.0092-0.012% of Als, less than or equal to 0.003% of O and less than or equal to 0.0002% of H, wherein the content of Nb and V is less than or equal to 0.08%, and the balance of Fe and avoidable impurities. The yield strength of the 420MPa-level low-alloy high-intensity ultra-thick steel plate can reach a 420MPa level, the tensile strength is greater than or equal to 550MPa, the elongation percentage is greater than or equal to 25%, the ballistic work of minus 20 DEG C is greater than or equal to 160J, the performances are excellent, and the application is wide.

Description

technical field [0001] The invention belongs to the field of extra-thick steel plate preparation, and in particular relates to a 420MPa grade low-alloy high-strength extra-thick steel plate and a manufacturing method thereof. Background technique [0002] With the rapid development of modern industry, the demand for various types of steel plates such as heavy machinery manufacturing, pressure vessels, boiler manufacturing, military industry, offshore drilling platforms, nuclear power plants, mold manufacturing, bridges, airports, transportation, etc. is increasing year by year. The manufacturing cost of these devices tends to be larger, and the demand for large single-weight and extra-thick (greater than 100mm) steel plates that must be used to manufacture these large devices is also increasing; and in order to improve the safety and reliability of large devices, The quality requirements for the steel plates used are becoming more and more stringent. In addition to the orig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/12C22B9/18C21D8/02
Inventor 熊涛熊玉彰邱文涛王世森董汉雄张新宇洪君李德发梁宝珠王建明陈勇王孝东余宏伟李银华李伟
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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