Martensite broad hot strip with tensile strength of 1500MPa level and production method of martensite broad hot strip

A technology of tensile strength and production method, which is applied in the field of metallurgy, can solve problems such as short residence time and increased difficulty in controlling the microstructure of finished products, and achieve the effects of simplifying processing steps, saving processing time and processing costs

Active Publication Date: 2015-09-23
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the hot rolling production process, each rolling parameter fluctuates within a certain range, which makes it more difficult to control the microstructure of the finished product, and the laminar cooling stage after the rolling is completed, that is, the residence time of the microstructure stage that determines the final product is relatively long. Short, so finding the best process control parameters in the rolling process will be the key content of the present invention

Method used

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  • Martensite broad hot strip with tensile strength of 1500MPa level and production method of martensite broad hot strip
  • Martensite broad hot strip with tensile strength of 1500MPa level and production method of martensite broad hot strip

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Tensile strength 1500MPa grade martensitic hot-rolled wide strip steel, chemical composition and weight percentage content: C: 0.14%, Si: 0.46%, Mn: 1.35%, P: 0.011%, S: 0.003%, Nb: 0.020 %, Ti: 0.03%, B: 0.0012%, Als: 0.017%, N: 0.0036%, and the balance is Fe and unavoidable impurity elements.

[0029] The production method comprises the following steps:

[0030] 1) The molten steel is smelted according to the above-mentioned composition, and the molten steel is subjected to RH vacuum degassing and continuous casting to obtain a slab;

[0031] 2) Heating the slab to 1265°C, descaling with 19MPa high-pressure water, rough rolling after 5 passes of rolling, the exit temperature is 1105°C, coiled by a hot coil box, and finishing rolling with 7 rolling mills. The rolling inlet temperature is 1075°C, and the outlet temperature is 890°C; laminar cooling is performed at a cooling rate of 75°C / S, and hot-rolled wide strips are obtained from coils at 153°C.

Embodiment 2

[0033] Tensile strength 1500MPa grade martensitic hot-rolled wide strip steel, chemical composition and weight percentage content: C: 0.17%, Si: 0.54%, Mn: 1.53%, P: 0.009%, S: 0.003%, Nb: 0.034 %, Ti: 0.048%, B: 0.0029%, Als: 0.031%, N: 0.0044%, and the balance is Fe and unavoidable impurity elements.

[0034] The production method comprises the following steps:

[0035] 1) The molten steel is smelted according to the above-mentioned composition, and the molten steel is subjected to RH vacuum degassing and continuous casting to obtain a slab;

[0036] 2) Heating the slab to 1293°C, descaling with 19MPa high-pressure water, rough rolling after 5 passes of rolling, the exit temperature is 1133°C, coiled by a hot coil box, and finishing rolling with 7 rolling mills. The rolling inlet temperature is 1100°C, and the exit temperature is 916°C; the speed is 77°C / S for laminar cooling, and the coil is obtained at 140°C to obtain a hot-rolled wide strip.

Embodiment 3

[0038] Tensile strength 1500MPa grade martensitic hot-rolled wide strip steel, chemical composition and weight percentage content: C: 0.15%, Si: 0.45%, Mn: 1.41%, P: 0.007%, S: 0.004%, Nb: 0.031 %, Ti: 0.040%, B: 0.0020%, Als: 0.021%, N: 0.0032%, and the balance is Fe and unavoidable impurity elements.

[0039] The production method comprises the following steps:

[0040] 1) The molten steel is smelted according to the above-mentioned composition, and the molten steel is subjected to RH vacuum degassing and continuous casting to obtain a slab;

[0041] 2) Heating the slab to 1282°C, descaling with 18MPa high-pressure water, rough rolling after 5 passes of rolling, the exit temperature is 1122°C, coiled by a hot coil box, and finishing rolling with 7 rolling mills. The rolling entrance temperature is 1092°C, the exit temperature is 902°C; the speed is 70°C / S for laminar cooling, and the coil is obtained at 190°C to obtain a hot-rolled wide strip.

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Abstract

The invention relates to a martensite broad hot strip with tensile strength of 1500MPa level and a production method of the martensite broad hot strip. The martensite broad hot strip comprises C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulphur), Nb (niobium), Ti (titanium) , B (boron), AlS (acetolactate synthase) and N (nitrogen), with the balance being Fe and inevitable impurity elements. Weight percentages of the C, the Si, the Mn, the Nb, the Ti, the B and the AlS are 0.13-0.17%, 0.40-0.60%, 1.30-1.60%, 0.020-0.050%, 0.02-0.05%, 0.0010-0.0030% and 0.010-0.060% respectively. Weight percentages of the P, the S and the N are smaller than or equal to 0.025%, 0.020% and 0.005% respectively. The production method includes smelting molten steel according to the set components, and subjecting the molten steel to continuous casting to obtain a plate blank; heating the plate blank to 1240-1300 DEG C, and performing high-pressure water descaling, controlled rolling, control-rolled cooling and reeling to obtain the broad hot strip. The produced broad hot strip has the advantages that yield strength is larger than 1000MPa, tensile strength is larger than 1500MPa, and ductility is larger than 10%; the broad hot strip is applied to hot-rolled plates of shear blades of excavators, a quenching process is omitted, and production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a martensitic hot-rolled wide strip steel with a tensile strength of 1500 MPa and a production method thereof. Background technique [0002] Wear-resistant steel as a special steel began in the second half of the 19th century. At present, the steel for excavator blades produced in the industry belongs to the field of wear-resistant steel. In order to achieve high strength and plasticity, it is required in the smelting process The martensite structure is obtained, so the hot-rolled raw materials in the industry are obtained by quenching and tempering heat treatment. [0003] If the structure of the hot-rolled incoming material is martensitic, the quenching process will be exempted, which will greatly save processing time and processing costs, which will be eagerly awaited by excavator blade manufacturers. However, due to the characteristics of the hot rolling produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 包阔张兴利高海陆凤慧周海峰罗波
Owner HEBEI IRON AND STEEL
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