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Method for producing thin-specification and high-strength atmosphere corrosion resistance structural steel plate

A technology for atmospheric corrosion-resistant and structural steel plates, applied in the field of atmospheric corrosion-resistant steel plates for structures, can solve unseen problems and achieve the effects of easy welding, low yield ratio and stable production process

Inactive Publication Date: 2016-01-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the yield strength of high-strength weathering steel produced by hot continuous rolling production line is above 450 MPa, such as patent number CN101235468A, which discloses the composition design of high P and alloying of Cr, Ni and Cu, and manufactures a yield strength in hot continuous rolling production line. Production method of atmospheric corrosion-resistant steel with strength greater than 400MPa; Patent No. CN101503782A and Patent No. CN103911558A, both of which disclose the production of high-strength atmospheric corrosion-resistant steel and its production method in a hot continuous rolling production line, but no double-stand plate Report on the manufacturing method of high-strength atmospheric corrosion-resistant structural steel produced by rolling mill

Method used

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  • Method for producing thin-specification and high-strength atmosphere corrosion resistance structural steel plate

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A method for producing thin-gauge high-strength atmospheric corrosion-resistant structural steel plates. The steel plates include the following components by weight percentage: C: 0.08%, Si: 0.45%, Mn: 1.10%, P: 0.020%, S: 0.0045%, Ni : 0.15%, Cr: 0.70%, Cu: 0.26%, Mo: 0.12%, Nb: 0.040%, V: 0.018%, RE: 0.020%, Ca: 0.0025%, Alt: 0.021%, O: 0.0010%, N : 0.0045%, H: 0.00015%, and the rest are iron and unavoidable impurities.

[0021] Production is carried out by using a double-frame plate production line, including converter or electric furnace smelting process, refining process outside the furnace, vacuum treatment process, continuous casting process, controlled rolling process and controlled cooling process. In the continuous casting slab heating process, the heating temperature of the continuous casting slab before rolling is 1240°C; in the controlled rolling process, the finish temperature of rough rolling is 1080°C, the thickness of the slab to be warmed is 29.95mm, t...

Embodiment 2

[0024] The steel plate includes the following components by weight percentage: C: 0.07%, Si: 0.30%, Mn: 1.35%, P: 0.015%, S: 0.0025%, Ni: 0.22%, Cr: 0.55%, Cu: 0.40%, Nb : 0.035%, Ti: 0.015%, Ca: 0.0015%, Alt: 0.020%, O: 0.0012%, N: 0.0040%, H: 0.00018%, and the rest are iron and unavoidable impurities.

[0025] Production is carried out by using a double-frame plate production line, including converter or electric furnace smelting process, refining process outside the furnace, vacuum treatment process, continuous casting process, controlled rolling process and controlled cooling process. In the continuous casting slab heating process, the heating temperature of the continuous casting slab before rolling is 1180°C; in the controlled rolling process, the finish temperature of rough rolling is 1030°C, the thickness of the slab to be warmed is 30.33mm, the finish rolling temperature is 835°C, and the finish rolling temperature is 835°C. The final pass reduction rate is 10%; in th...

Embodiment 3

[0027] The steel plate includes the following components by weight percentage: C: 0.06%, Si: 0.25%, Mn: 1.45%, P: 0.025%, S: 0.0018%, Ni: 0.18%, Cr: 0.50%, Cu: 0.32%, Nb : 0.025%, Ti: 0.020%, V: 0.015%, Ca: 0.0010%, Alt: 0.015%, O: 0.0010%, N: 0.0050%, H: 0.00015%, and the rest are iron and unavoidable impurities.

[0028] Production is carried out by using a double-frame plate production line, including converter or electric furnace smelting process, refining process outside the furnace, vacuum treatment process, continuous casting process, controlled rolling process and controlled cooling process. In the continuous casting slab heating process, the heating temperature of the continuous casting slab before rolling is 1200°C; in the controlled rolling process, the finishing temperature of rough rolling is 1050°C, the thickness of the slab to be warmed is 36mm, the finishing rolling temperature of finishing rolling is 840°C, and the finish rolling The pass reduction rate is 8.5...

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Abstract

The invention discloses a method for producing a thin-specification and high-strength atmosphere corrosion resistance structural steel plate. The heating temperature of a continuous casting before rolling ranges from 1,150 DEG C to 1,250 DEG C; the finishing temperature of rough rolling ranges from 1,020 DEG C to 1,080 DEG C, and the accumulated rolling reduction of rough rolling is larger than or equal to 60%; the thickness of a hold-temperature blank is larger than or equal to 3.0 h, the fine rolling finishing temperature is larger than or equal to 830 DEG C, and the reduction rate of fine rolling tail pass is smaller than or equal to 12.5%; after fine rolling is finished, high-speed steel throwing is carried out, the steel throwing speed is 4 m / s, and it is guaranteed that the water entry temperature of a rolled piece is larger than or equal to 770 DEG C; and laminar cooling is carried out, the finished cooling temperature ranges from 550 DEG C to 650 DEG C, and the cooling speed ranges from 5 DEG C / s to 30 DEG C / s. The steel is delivered in the hot rolling state; and by means of the low-carbon and alloy components, it is guaranteed that the atmosphere corrosion resistance index I of the steel is larger than or equal to 6.5, the yield strength of the steel is larger than or equal to 450 MPa, the tensile strength of the steel is larger than or equal to 550 MPa, the yield ratio of the steel is smaller than or equal to 0.85, the ductility of the steel is larger than or equal to 20%, and the ballistic work of the steel at the temperature being minus 60 DEG C is larger than or equal to 100 J.

Description

technical field [0001] The invention relates to an atmospheric corrosion-resistant structural steel plate, in particular to a method for producing a thin-gauge, high-strength atmospheric corrosion-resistant structural steel plate with a double-stand medium-thick plate rolling mill. Background technique [0002] Atmospheric corrosion-resistant steel refers to low-alloy-strength steel that has good corrosion resistance in the atmosphere by adding a small amount of alloying elements such as Cu, P, Cr, Ni, and Si. The atmospheric corrosion resistance of weather-resistant steel is 2-8 times that of ordinary carbon steel. In addition to good weather resistance, weather-resistant steel also has excellent forming and welding performance. It can be widely used in vehicles, bridges, containers, buildings, towers, etc. Especially for the development requirements of high-speed and heavy-duty railway transportation in my country, it is necessary to increase the strength of atmospheric co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C21D8/02
Inventor 王军崔强赵晋斌付军
Owner NANJING IRON & STEEL CO LTD
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