700 MPa-stage-or-over ultra-high-strength weather-resisting steel plate and hot continuous rolling production method thereof

An ultra-high-strength, hot continuous rolling technology, applied in the field of iron and steel smelting, can solve the problems of unsatisfactory weather-resistant steel plate strength, complicated process, and low production efficiency, and achieve good weather resistance, simple process, and high production efficiency.

Inactive Publication Date: 2018-03-23
SHOUGANG JINGTANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, even if the existing technology improves the strength of the ultra-high strength weather-resistant steel plate above 700MPa by adding microalloying elements, the strength of the weather-resistant steel plate finally obtained is still not ideal. At the same time, the weather-resistant steel plate is produced by using the existing hot rolling process The process is also very complicated and the production efficiency is low

Method used

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  • 700 MPa-stage-or-over ultra-high-strength weather-resisting steel plate and hot continuous rolling production method thereof

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Embodiment 1

[0051] First of all, it is produced by the "full three desulfurization" process, using low-sulfur blast furnace molten iron as raw material, the molten iron is desulfurized by KR, the sulfur content in the molten iron is reduced from 0.039% to 0.0004%, and the desulfurized molten iron is mixed into a 300-ton dephosphorization converter for desulfurization Silicon dephosphorization treatment, adding 17 tons of scrap steel to the dephosphorization furnace, after 7 minutes of oxygen blowing, the semi-steel is produced, the composition of the semi-steel is: C 3.32%, P0.022%, S 0.005%, and then 300 tons of decarburization converter Load copper plates, nickel plates and semi-steel for further decarburization and temperature-raising blowing. The final composition is: C 0.039%, P0.0065%, S0.007%, and the tapping temperature of the converter is 1676°C. During the process, Si-Mn, medium carbon Mn-Fe and Cr-Fe are added for alloying treatment. When the molten steel in the ladle is about 1...

Embodiment 2

[0058]First of all, it is produced by the "full three desulfurization" process, using low-sulfur blast furnace molten iron as raw material. The molten iron is desulfurized by KR, and the sulfur content in the molten iron is reduced from 0.034% to 0.0001%. The desulfurized molten iron is mixed into a 300-ton dephosphorization converter for desulfurization Silicon dephosphorization treatment, adding 17 tons of scrap steel to the dephosphorization furnace, after 8 minutes of oxygen blowing, the semi-steel is produced, the composition of the semi-steel is: C 3.29%, P0.024%, S 0.004%, and then 300 tons of decarburization converter Load copper plates, nickel plates and semi-steel for further decarburization and temperature-raising blowing. The final composition is: C 0.034%, P0.008%, S0.007%, and the tapping temperature of the converter is 1667°C. During the process, Si-Mn, medium carbon Mn-Fe and Cr-Fe are added for alloying treatment. When the molten steel in the ladle is about 120...

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Abstract

The invention relates to the technical field of steel and iron metallurgy, in particular to a 700 MPa-stage-or-over ultra-high-strength weather-resisting steel plate and a hot continuous rolling production method thereof. The 700 MPa-stage-or-over ultra-high-strength weather-resisting steel plate comprises the chemical components of, by mass, 0.06-0.08% of carbon, 0.15-0.25% of silicon, 1.25-1.35%of manganese, 0.018% or the less of phosphorus, 0.005% or the less of sulfur, 0.02-0.05% of total aluminum, 0.05-0.07% of niobium, 0.09-0.13% of titanium, 0.37-0.45% of chrome, 0.20-0.28% of copper,0.10-0.15% of nickel, 0.0050% or the less of nitrogen and the balance iron. According to the 700 MPa-stage-or-over ultra-high-strength weather-resisting steel plate and the hot continuous rolling production method, the content of Cu and P in weather-resisting steel is reduced, thus through control over the content of harmful elements of S and N, harm of copper brittleness and phosphorus brittleness caused by Cu and P is eliminated, and the ultra-high strength and good weather-resisting property of the steel are ensured; and meanwhile, through a mode of combination of LF refining and RH refining, the element content is accurately adjusted in the alloying process, through the hot continuous rolling production method, the process is simple, the production efficiency is high, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to an ultra-high-strength weather-resistant steel plate above 700 MPa and a hot continuous rolling production method thereof. Background technique [0002] As a newly developed container plate product in recent years, ultra-high-strength (above 700MPa) weathering steel plays an important role in promoting the development trend of steel material thinning and weight reduction, and better meets the needs of users to reduce transportation costs, save energy and reduce energy consumption. consumption needs. In the development process of weathering steel, copper and phosphorus are the main alloying elements in the earliest development of weathering steel. With the increase of the strength demand of weathering steel, the higher content of copper and phosphorus will reduce the mechanical properties of steel, such as copper in steel Enrichment can easily cause copper embritt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C38/50C22C38/42C21C7/10C21C7/064C21C7/068C21D8/02
CPCC22C38/02C21C7/064C21C7/068C21C7/10C21D8/0226C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50
Inventor 陈守关王莉李晓林李向奎任秋红王章岭田贵昌韩乐张镇詹美珠李颖
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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