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A kind of q550e high-strength steel hot-rolled coil and production method thereof

A Q550E, hot-rolled coil technology, applied in the field of metallurgy, to achieve the effect of simplifying the production process, eliminating residual stress, and excellent performance

Active Publication Date: 2016-08-24
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned technical problems in the industry, the purpose of the present invention is to provide a Q550E high-strength steel hot-rolled coil and its production method, without adding Mo expensive elements, taking advantage of vanadium and titanium resources to add a small amount of Nb elements, using The whole process of pouring protection, effective control of center segregation and center porosity, so that the slab has excellent surface quality, and the coil has no defects after rolling, and adopts the method of slow cooling in the heat preservation pit to eliminate residual stress, and produces Q550E with excellent performance hot rolled coil

Method used

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  • A kind of q550e high-strength steel hot-rolled coil and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A hot-rolled coil of Q550E high-strength steel, the chemical composition of which is C: 0.07%, Si: 0.15%, Mn: 1.44%, P: 0.020%, S: 0.003%, Nb: 0.029%, V: 0.020 %, Ti: 0.089%, Als: 0.036%, and the rest are Fe and unavoidable impurities.

[0017] The production method of Q550E high-strength steel hot-rolled coils includes smelting, rolling, cooling, and crimping. The specific production process is as follows:

[0018] 1) The molten steel is smelted according to the set composition of the above mass percentage, and the molten steel is subjected to a continuous casting process to obtain a slab. In the continuous casting process, the casting speed is constant at 1.0m / min. The temperature is 80°C, and the whole protection casting is adopted; the P of the final control slab: ≤0.020%, S: ≤0.010%, T[O]≤25ppm, [N]≤50 ppm;

[0019] Blowing is strictly prohibited in the converter steelmaking process. The alloying of Nb and V elements is carried out by adding ferro-niobium and ferr...

Embodiment 2

[0024] A hot-rolled coil of Q550E high-strength steel, the chemical composition of which is C: 0.08%, Si: 0.10%, Mn: 1.50%, P: 0.015%, S: 0.004%, Nb: 0.034%, V: 0.018 %, Ti: 0.08%, Als: 0.035%, and the rest are Fe and unavoidable impurities.

[0025] The production method of Q550E high-strength steel hot-rolled coils includes smelting, rolling, cooling, and crimping. The specific production process is as follows:

[0026] 1) The molten steel is smelted according to the set composition of the above mass percentage, and the molten steel is subjected to a continuous casting process to obtain a slab. In the continuous casting process, the casting speed is constant at 1.1m / min. The temperature is 70°C, and the whole protection casting is adopted; the P of the final control slab: ≤0.020%, S: ≤0.010%, T[O]≤25ppm, [N]≤50 ppm;

[0027] Blowing is strictly prohibited in the converter steelmaking process. The alloying of Nb and V elements is carried out by adding ferro-niobium and ferro...

Embodiment 3

[0032] A hot-rolled coil of Q550E high-strength steel, the chemical composition of which is C: 0.05%, Si: 0.25%, Mn: 1.40%, P: 0.010%, S: 0.010%, Nb: 0.045%, V: 0.025 %, Ti: 0.07%, Als: 0.015%, and the rest are Fe and unavoidable impurities.

[0033] The production method of Q550E high-strength steel hot-rolled coils includes smelting, rolling, cooling, and crimping. The specific production process is as follows:

[0034]1) The molten steel is smelted according to the set composition of the above mass percentage, and the molten steel is subjected to a continuous casting process to obtain a slab. In the continuous casting process, the casting speed is constant at 1.2m / min. The temperature is 75°C, and the whole protection casting is adopted; the P of the final control slab: ≤0.020%, S: ≤0.010%, T[O]≤25ppm, [N]≤50 ppm;

[0035] Blowing is strictly prohibited in the converter steelmaking process. The alloying of Nb and V elements is carried out by adding ferro-niobium and ferro-...

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Abstract

The invention relates to a Q550E high-strength steel hot rolled coil and a production method thereof, and belongs to the technical field of metallurgy. The coil is composed of the following chemical components in percentage by weight: 0.05 to 0.09% of C, not more than 0.25% of Si, 1.40 to 1.60% of Mn, not more than 0.020% of P, not more than 0.010% of S, 0.025 to 0.045% of Nb, 0.015 to 0.025% of V, 0.07 to 0.09% of Ti, not less than 0.015% of Als, and the balance being Fe and inevitable impurities. The production method comprises steps of smelting, rolling, cooling, and curling. The production cost is low, the production procedure is simplified, the yield of flat plate is high, and the energy consumption is reduced. The yield strength of the hot rolled coil is larger than 700 MPa, the tensile strength is larger than 700 MPa, the elongation rate is larger than 16%, and thus the hot rolled coil can be used in the fields such as engineering machinery, and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Q550E high-strength steel hot-rolled coil and a production method thereof. Background technique [0002] The steel used for high-strength structural parts, engineering machinery, and mining steel structural parts is a low-alloy high-strength steel that is based on C-Mn steel and added microalloying elements such as Mo, Nb, V, and Ti. At present, high-strength steel plates are widely used in the construction machinery industry and coal mining machinery industry, and the required thickness is mainly 4-80mm. Among them, steel plates with a thickness below 20mm are mainly coiled flat products, and most of them are used in the construction machinery industry. It is used to manufacture crane arms, frames, etc.; steel plates with a thickness of more than 20mm are mainly medium-thick plate products, and most of them are used in the coal mining machinery industry. Since ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 张兴利高海秦治国白瑞国田鹏薛启河
Owner HEBEI IRON AND STEEL
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