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A kind of large-section boron-containing low yield ratio 355mpa hot-rolled h-shaped steel and its production method

A low yield ratio, H-shaped steel technology, applied in the field of metallurgical materials, can solve the problems of unstable performance, poor uniformity, unfavorable application, etc., to achieve stable performance, good uniformity, guaranteed impact toughness and low yield strength than the effect

Active Publication Date: 2020-11-24
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the large-section boron-containing low-yield ratio 355MPa hot-rolled H-shaped steel in the prior art has poor uniformity and unstable performance, which is not conducive to application

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  • A kind of large-section boron-containing low yield ratio 355mpa hot-rolled h-shaped steel and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1, the preparation of hot-rolled H-shaped steel

[0047] Step 1, smelting and continuous casting: use the pretreated molten iron to carry out double-slag converter smelting, LF refining, and continuous casting of shaped billets to obtain H-shaped steel billets;

[0048] Step 2, hot rolling: after heating the H-shaped billet obtained in step 1, perform high-pressure water dephosphorization, and obtain hot-rolled H-shaped steel after hot rolling;

[0049] Step 3, cooling and shape straightening: cooling the hot-rolled H-shaped steel after hot rolling to 650°C at a cooling rate of 20-25°C / s, and performing shape straightening;

[0050]Step 4, surface quality inspection and sawing: the H-shaped steel obtained in step 3 is subjected to surface quality inspection and sawing to obtain the large-section boron-containing low yield ratio 355MPa hot-rolled H-shaped steel.

[0051] Key control parameters: (1) The tapping temperature is 1610°C, the carbon content of tapp...

Embodiment 2

[0055] Step 1, smelting and continuous casting: use the pretreated molten iron to carry out double-slag converter smelting, LF refining, and continuous casting of shaped billets to obtain H-shaped steel billets;

[0056] Step 2, hot rolling: after heating the H-shaped billet obtained in step 1, perform high-pressure water dephosphorization, and obtain hot-rolled H-shaped steel after hot rolling;

[0057] Step 3, cooling and shape straightening: cooling the hot-rolled H-shaped steel after hot rolling to 650°C at a cooling rate of 20-25°C / s, and performing shape straightening;

[0058] Step 4, surface quality inspection and sawing: the H-shaped steel obtained in step 3 is subjected to surface quality inspection and sawing to obtain the large-section boron-containing low yield ratio 355MPa hot-rolled H-shaped steel.

[0059] Key control parameters: (1) The tapping temperature is 1611°C, the carbon content of tapping is 0.07%, and the phosphorus content of tapping is 0.015%. (2) ...

Embodiment 3

[0063] Step 1, smelting and continuous casting: use the pretreated molten iron to carry out double-slag converter smelting, LF refining, and continuous casting of shaped billets to obtain H-shaped steel billets;

[0064] Step 2, hot rolling: after heating the H-shaped billet obtained in step 1, perform high-pressure water dephosphorization, and obtain hot-rolled H-shaped steel after hot rolling;

[0065] Step 3, cooling and shape straightening: cooling the hot-rolled H-shaped steel after hot rolling to 650°C at a cooling rate of 20-25°C / s, and performing shape straightening;

[0066] Step 4, surface quality inspection and sawing: the H-shaped steel obtained in step 3 is subjected to surface quality inspection and sawing to obtain the large-section boron-containing low yield ratio 355MPa hot-rolled H-shaped steel.

[0067] Key control parameters: (1) The tapping temperature is 1619°C, the carbon content of tapping is 0.08%, and the phosphorus content of tapping is 0.014%. (2) ...

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Abstract

The invention discloses large section boron-containing hot-rolled H-shaped steel with a low yield ratio of 355MPa. The large section boron-containing hot-rolled H-shaped steel is prepared from the following components in percentage by weight: 0.17-0.19% of C, less than or equal to 0.45% of Si, 1.40-1.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.02% of S and 0.0010-0.0025%of B. The invention further discloses a production method of the large section boron-containing hot-rolled H-shaped steel. According to the large section boron-containing hot-rolled H-shaped steel with the low yield ratio of 355MPa, an alloying element boron is added, the strength of the H-shaped steel is increased, the characteristics of impact toughness and low yield ratio are ensured, the uniformity after cooling after rolling is good, and the performance is stable and does not fluctuate; and the elements are controlled by narrow compositions, sulfur phosphorus content is strictly controlled, and production costs are reduced. The market prospects are broad and the needs of social development are met. The production method of the hot-rolled H-shaped steel has a simple preparation methodand is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of metallurgical materials, in particular to a boron-containing low yield ratio 355MPa hot-rolled H-shaped steel and a production method thereof. Background technique [0002] As the demand for H-beams for construction becomes larger and larger, higher requirements are placed on the quality of H-beams for construction. Low-yield ratio H-beams are mainly used in buildings, bridges, power station equipment, water conservancy, energy, chemical industry, lifting and transportation machinery and other steel structures with high seismic requirements, which can effectively absorb deformation loads and improve steel structures. Safety performance in extreme environments. Domestic low-yield-ratio H-beams are affected by the process in the production process, and are affected by the production control level of continuous casting, rolling, post-rolling cooling and post-rolling heat treatment, which limits the producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C33/04B21C37/00
CPCB21C37/00C22C33/04C22C38/002C22C38/02C22C38/04
Inventor 冯岩青涛雅卜向东宋振东
Owner BAOTOU IRON & STEEL GRP