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A kind of high-strength refractory steel bar and its preparation method

A high-strength, steel bar technology, applied in the field of building steel bars, can solve problems such as complex processes, achieve the effects of simple process, improved production efficiency, easy control and operation

Active Publication Date: 2020-08-25
YANCHENG LIANXIN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses a controlled rolling and controlled cooling process in the billet rolling process, but the process is relatively complicated

Method used

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  • A kind of high-strength refractory steel bar and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, the iron ore is sintered to obtain sintered ore, and the sintered ore is smelted in a blast furnace to obtain molten iron. Put molten iron with a total volume of 5 tons in a 10-ton converter, add manganese, silicon, niobium, vanadium, chromium, molybdenum and other alloy components into the molten iron, and control the percentage of each element in the molten iron within the following range: C: 0.19%, Si: 0.45%, Mn: 1.45%, P: 0.012%, S: 0.01%, Ni: 0.55%, V: 0.05%, Nb: 0.07, Cr: 0.7%, Mo: 0.25%, the rest is Fe and other unavoidable impurities.

[0022] The molten iron is desulfurized, and the converter smelting adopts the double slag method to dephosphorize, so that the content of sulfur and phosphorus in the molten iron meets the requirements. The molten iron is refined by blowing argon at the top and bottom of the converter and vacuum-treated to obtain molten steel, so as to further control the content of various elements in the molten steel.

[0023] The molt...

Embodiment 2

[0029] Sintered ore is smelted in a blast furnace to obtain molten iron. In this example, in addition to the elements added in Example 1, Re is added to the molten iron to control the percentage of each element in the molten iron within the following ranges: C: 0.155%, Si: 0.35%, Mn : 1.6%, P: 0.010%, S: 0.008%, Ni: 0.65%, V: 0.03%, Nb: 0.04%, Cr: 0.5%, Mo: 0.35%, Re: 0.006%, the rest is Fe and others Avoid impurities.

[0030]Add an appropriate amount of 0.006% Re element to the steel bar to purify the molten steel. After billet casting and rolling, the high temperature strength of the steel bar is obviously improved, the overheating sensitivity of the steel is reduced, and the overall high temperature resistance and corrosion resistance of the steel bar are improved.

[0031] During the smelting process, the molten iron is desulfurized, and the converter smelting and double slag method are used for dephosphorization, so that the sulfur and phosphorus contents in the molten...

Embodiment 3

[0037] The iron ore sinter is smelted in a blast furnace to obtain molten iron. In this example, in addition to the elements added in Example 1, Re is added to the molten iron to control the percentage of each element in the molten iron within the following ranges: C: 0.22%, Si: 0.50%, Mn : 1.35%, P: 0.015%, S: 0.009%, Ni: 0.60%, V: 0.08%, Nb: 0.10%, Cr: 0.8%, Mo: 0:15%, Re: 0.009%, and the rest are Fe and other unavoidable impurities.

[0038] The molten iron is desulfurized and dephosphorized by converter smelting to control the sulfur and phosphorus content in the molten iron; the molten iron is refined and vacuum treated to obtain molten steel, and the content of various elements in the molten steel is further controlled to make the molten steel meet the required composition content.

[0039] The molten steel is continuously cast to obtain a cast slab, and the slab is sent into a heating furnace and heated to 750°C at a rate of 5.0°C / s, and then heated to 1100°C at a rate...

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Abstract

The invention discloses a high strength fire-proof steel bar and a preparation method thereof. The high strength fire-proof steel bar is composed of the following components of, by weight, more than or equal to 0.15% and less than or equal to 0.22% of C; more than or equal to 0.35% and less than or equal to 0.50% of Si; more than or equal to 1.3% and less than or equal to 1.6% of Mn; less than orequal to 0.015% of P; less than or equal to 0.01% of S; more than or equal to 0.50% and less than or equal to 0.65% of Ni; more than or equal to 0.02% and less than or equal to 0.08% of V; more than or equal to 0.04% and less than or equal to 0.10 % of Nb; more than or equal to 0.5% and less than or equal to 0.8% of Cr; more than or equal to 0.15% and less than or equal to 0.35% of Mo, and the balance Fe and inevitable impurities. The preparation method comprises the steps that alloying elements of the fire-proof steel bar are added into molten iron for smelting and blank casting, rough rolling and fine rolling are carried out in order, wind cooling and air cooling are carried out after fine rolling, and the high strength fire-proof steel bar with a microscopic structure of a ferrite and bainite structure and an M / A island is obtained. The preparation method is simple in process and easy to operate and control, and has high production efficiency.

Description

technical field [0001] The invention relates to the technical field of steel bars for construction, in particular to a high-strength fire-resistant steel bar and a preparation method thereof. Background technique [0002] At present, the construction industry is developing very rapidly. The performance and quality of construction steel, especially construction steel bars, has become one of the important links in the construction industry to measure whether buildings are safe and reliable, and whether they can guarantee the design life of buildings. Especially the occurrence of fire in high-rise buildings has caused great threats and losses to people's life safety and property. People have gradually realized the importance of the fire resistance of building steel bars to the safety of buildings. [0003] The composition and process of "a fire-resistant steel bar and its production process" (CN104032234A) are disclosed in the existing patent literature. In this patent, an el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/46C22C38/48C22C38/44C21D8/08
CPCC21D8/08C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/58
Inventor 王长城周和敏谢锦官陈春荣
Owner YANCHENG LIANXIN IRON & STEEL CO LTD