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High-strength extremely thick steel plate and production method thereof

A technology of extra-thick steel plate and production method, applied in the field of metallurgy, can solve the problems of small thickness specification, low production efficiency, delamination, etc., and achieve the effect of good mechanical properties

Inactive Publication Date: 2015-09-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. The thickness of the product is small, the strength is low, and the scope of application is narrow;
[0009] 2. The production process is complicated, the production efficiency is low, and defects such as delamination are easy to occur

Method used

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  • High-strength extremely thick steel plate and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The chemical composition wt% content is: C0.12%, Si0.16%, Mn1.45%, P0.010%, S0.003%, Ni0.15%, Cr0.14%, Mo0.15%, V0.04 %, Ti0.017%, Cu0.21%, Als0.040%, and the rest are Fe and unavoidable impurities.

[0039] Smelting process:

[0040] After smelting, molten steel is sent to LF furnace for refining treatment, VD degassing, reducing the harmful effects of harmful gases O, H, N, etc. and S; LF furnace (100t) is fed with 250m of Al wire and 55kg of ferro-titanium. The vacuum degree of VD is controlled at 70Pa, kept for 17min, the pouring temperature is 1560°C, and the steel billet with a thickness of 800mm is cast.

[0041] Rolling process:

[0042] Flaw detection and cleaning are carried out on the incoming billet, and the surface of the billet is fully covered with 1.5mm cold-rolled plate before heating. The heating temperature is controlled at 1152°C to ensure fine austenite grains and play the role of refining grains after rolling. High-pressure water is used to full...

Embodiment 2

[0046] The chemical composition wt% content is: C0.134%, Si0.24%, Mn1.48%, P0.010%, S0.0024%, Ni0.22%, Cr0.16%, Mo0.25%, V0.03 %, Ti0.015%, Cu0.24%, Als0.031%, and the rest are Fe and unavoidable impurities.

[0047] Smelting process:

[0048] After smelting, molten steel is sent to LF furnace for refining treatment, VD degassing to reduce the harmful effects of harmful gases O, H, N, etc. and S; LF furnace (100t) is fed with 170m of Al wire and 60kg of ferro-titanium. The vacuum degree of VD is controlled at 50Pa, kept for 38min, the casting temperature is 1580°C, and a 1000mm thick billet is cast.

[0049] Rolling process:

[0050] Flaw detection and cleaning are carried out on the incoming billet, and the surface of the billet is fully covered with 2.5mm cold-rolled plate before heating. The heating temperature is controlled at 1176°C to ensure fine austenite grains and play the role of refining grains after rolling. High-pressure water is used to fully descale before a...

Embodiment 3

[0054] The chemical composition wt% content is: C0.14%, Si0.24%, Mn1.60%, P0.011%, S0.0013%, Ni0.35%, Cr0.24%, Mo0.20%, V0.05 %, Ti0.022%, Cu0.30%, Als0.017%, and the rest are Fe and unavoidable impurities.

[0055] Smelting process:

[0056] After smelting, molten steel is sent to LF furnace for refining treatment, VD degassing to reduce the harmful effects of harmful gases O, H, N, etc. and S; LF furnace (100t) feeds 280m of Al wire and 65kg of ferro-titanium. The vacuum degree of VD is controlled at 60Pa, kept for 30min, the casting temperature is 1570°C, and a 900mm thick billet is cast.

[0057] Rolling process:

[0058] Flaw detection and cleaning are carried out on the incoming billet, and the surface of the billet is fully covered and packaged with a 2mm cold-rolled plate before heating. The heating temperature is controlled at 1189°C to ensure fine austenite grains and play a role in refining grains after rolling. High-pressure water is used to fully descale befor...

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Abstract

The invention provides a high-strength extremely thick steel plate and a production method thereof. The high-strength extremely thick steel plate comprises 0.12-0.14wt% of C, 0.16-0.24wt% of Si, 1.45-1.60wt% of Mn, 0.020wt% or less P, 0.005wt% or less of S, 0.15-0.35wt% of Ni, 0.14-0.24wt% of Cr, 0.15-0.25wt% of Mo, 0.03-0.05wt% of V, 0.015-0.025wt% of Ti, 0.2-0.3wt% of Cu, and 0.015-0.040wt% of Als. The production method comprises the following steps: sending smelted molten steel to an LF furnace, refining, carrying out VD degassing, feeding Al wires and titanium iron to the LF furnace, and casting at 1560-1580DEG C; completely covering the surface of billet steel by a cold rolled sheet before heating, heating to 1150-1200DEG C, and rolling, wherein the bloom rolling temperature is 1100-1120DEG C, the finish rolling temperature is not lower than 950DEG C, and the total reduction is not smaller than 60%; heating to 935-950DEG C before quenching, and carrying out heat insulation for 2-2.25min / mm; and tempering to 645-665DEG C, and carrying out heat insulation for 2h + (2~2.2)min / mm. A flaw detection result of the 266mm high-strength extremely thick steel plate shows that the steel plate is qualified, the Rel is greater than 460MPa, and the -20DEG C AKv is greater than 27J.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength extra-thick steel plate with a thickness of 266 mm and a yield strength of more than 460 MPa and a production method thereof. Background technique [0002] Today, with the rapid development of science and technology and modern industry, the market demand for extra-thick steel plates for machinery and construction is increasing, and the performance requirements for steel plates are getting higher and higher. More than 120mm. Extra-thick plates can be widely used in construction machinery, bridges, containers, vehicles, ships, electrical equipment and other structural parts. However, it is difficult to produce such large thickness specifications to ensure qualified and uniform performance. [0003] At present, most of the extra-thick plates produced are below 150mm. For example, the patent application number of Wuyang Iron and Steel Co., Ltd. is 2008...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50
Inventor 李文斌刘明隋轶徐咏梅王小强原思宇赵坦李广龙费静
Owner ANGANG STEEL CO LTD
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