355MPa-class thick plate and production method thereof

A production method and technology for steel plates, applied in the field of high-strength extra-thick steel plates and their production, can solve the problems of cumbersome processes, uneven performance of normalized extra-thick steel plates, and high production costs, so as to improve production efficiency, improve remedial effects, and reduce raw materials. cost effect

Inactive Publication Date: 2014-04-30
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of uneven performance of normalized extra-thick steel plates in the prior art and the high production cost and cumbersome process of the conventional

Method used

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  • 355MPa-class thick plate and production method thereof
  • 355MPa-class thick plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] The specific chemical composition is shown in Table 1.

[0031] Table 1 embodiment 1 chemical composition wt% content table

[0032] C

[0033] Converter nitrogen blowing volume 68m 3 / min, the tapping temperature is 1640°C, and the tapping Als is 0.065%;

[0034] The argon station controls the bottom blowing argon flow rate at 37m 3 / min; argon blowing time 4min; nitrogen content in molten steel of argon outlet 0.018%.

[0035] The thickness of the billet is 300mm, heated to 1150℃, kept for 240min, and the soaking time is 90min.

[0036] The starting rolling temperature is 1120℃, the pass deformation is controlled at 15%-25%, and the final rolling temperature is 965℃. The thickness of the finished steel plate is 130mm;

[0037] After rolling, air-cooled to 550℃, the stacking height was 3.6m, and the slow cooling time was 18h.

Example Embodiment

[0038] Example 2

[0039] The specific chemical composition is shown in Table 2.

[0040] Table 2 embodiment 1 chemical composition wt% content table

[0041] C

[0042] Converter nitrogen blowing volume 65m 3 / min, the tapping temperature is 1610°C, and the tapping Als is 0.066%;

[0043] The argon station controls the bottom blowing argon flow rate at 40m 3 / min; argon blowing time 3min; nitrogen content in molten steel of argon outlet 0.0173%.

[0044] The thickness of the billet is 250mm, heated to 1170°C, kept for 200min, and the soaking time is 90min.

[0045] The starting rolling temperature is 1160℃, the pass deformation is controlled at 15%-25%, and the final rolling temperature is 943℃. The thickness of the finished steel plate is 80mm;

[0046] After rolling, air-cooled to 670℃, the stacking height was 4m, and the slow cooling time was 24h.

Example Embodiment

[0047] Example 3

[0048] The specific chemical composition is shown in Table 3.

[0049] Table 3 embodiment 3 chemical composition wt% content table

[0050] C

[0051] Converter nitrogen blowing volume 55m 3 / min, the tapping temperature is 1630 °C, and the tapping Als is 0.058%;

[0052] The argon station controls the bottom blowing argon gas flow at 45m 3 / min; 3.5min when blowing argon; nitrogen content in molten steel of argon outlet station is 0.0156%.

[0053] The thickness of the billet is 230mm, heated to 1150℃, kept for 180min, and the soaking time is 70min.

[0054] The starting rolling temperature is 1145℃, the pass deformation is controlled at 15%-25%, and the final rolling temperature is 935℃. The thickness of the finished steel plate is 50mm;

[0055] After rolling, air-cooled to 700 ℃, the stacking height was 5m, and the slow cooling time was 24h.

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Abstract

The invention provides a 355MPa-class thick plate and a production method thereof. The 355MPa-class thick plate contains the following chemical ingredients: 0.12-0.16% of C, 0.1-0.4% of Si, 1.3-1.7% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.01-0.05% of V, 0.01-0.04% of Cr, 0.005-0.011% of Ti, 0.01-0.015% of N and 0.01-0.04% of Als, wherein Als is not more than 1.7N + 0.0037%. A converter-LF-RH or VD (vacuum degassing) smelting technology is used, and nitrogen-containing alloy is added during converter nitrogen blowing and refining process so as to add nitrogen; heating temperature is 1150-1180 DEG C, in-furnace time is 100-300min, and soaking time is 60-90min; first-stage rolling is carried out, the start rolling temperature is 1050-1170 DEG C, single pass deformation rate is 15%-25%, and final rolling temperature is 930-1050 DEG C; the rolled thick plates are independently placed flatly and cooled to 500-700 DEG C by air, and then, the thick plates are stacked for slow cooling. According to the invention, production efficiency is improved, production cost is reduced greatly, yield strength of the thick plate is up to 388MPa, tensile strength of the thick plate is 521MPa, ductility of the thick plate is 26.75%, and AKv of the thick plate at -50 DEG C is 143J.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel production, and in particular relates to a high-strength extra-thick steel plate with a yield strength of 355 MPa to ensure normalizing performance and a production method thereof. Background technique [0002] The normalized 355MPa grade hot-rolled structural steel plate is widely used in large-scale construction machinery, construction, oil field drilling platforms, UHV power transmission components, vehicle frame structures, pressure vessels and other fields. Especially in some welded structures, some components must be made of structural steel with excellent performance in the normalizing state. Studies have shown that when producing steel plates with a thickness of more than 50mm, due to the small compression ratio, the advantages of the TMCP process are difficult to give full play to, and there are often uneven structures in the thickness direction of the steel plate. The grain must...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C21D8/02
Inventor 赵坦陈华王若刚李黎明刘源方恩俊李立斌
Owner ANGANG STEEL CO LTD
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