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Fire-resistant steel and preparation method thereof

A refractory and steel billet technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems that refractory steel cannot take into account high temperature yield strength and room temperature yield ratio, low room temperature yield ratio, and low production cost

Inactive Publication Date: 2011-08-31
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defect that the fire-resistant steel provided by the prior art cannot have both high temperature yield strength and room temperature yield ratio and low production cost, the present invention provides a kind of high temperature yield strength and low room temperature yield ratio and Low-cost vanadium-containing refractory steel and its preparation method

Method used

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  • Fire-resistant steel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] This example is used to illustrate the preparation of the fire-resistant steel provided by the present invention.

[0038] (1) Smelting molten steel:

[0039] Low-sulfur and low-phosphorus pure iron (Baoshan Iron and Steel Company) is used as raw material to smelt refractory steel. The smelting equipment is vacuum induction furnace (zg-0.05, Jinqi North Electric Furnace Equipment Factory), ferrochrome (Zhejiang Hengshan Industry and Trade Co., Ltd.), ferromolybdenum ( Hebei Chengda Metal Group Co., Ltd.) was put into the furnace before vacuuming, smelted under an absolute pressure of 1.5 Pa, and smelted to 1610 ° C, and continued to add 0.05 kg of deoxidizer aluminum pellets (Wuxi Juyuan Alloy Co., Ltd. ) for deoxidation, control the oxygen activity in the molten steel to below 25ppm, then add ferrosilicon (Anyang Hengwang Metallurgical Refractories Co., Ltd.) to the deoxidized molten steel at 1610°C and 3 Pa pressure, and add it after 1 minute Vanadium nitrogen alloy ...

Embodiment 2

[0046] This example is used to illustrate the preparation of the fire-resistant steel provided by the present invention.

[0047] Prepare refractory steel by smelting, casting and forging according to the method of Example 1, the difference is that the content of each component in molten steel is controlled, based on the total weight of molten steel, the C 0.07% by weight, Si 0.25% by weight, Mn 1.18% by weight %, V 0.1 wt%, Cr 0.48 wt%, Mo 0.3 wt%, B 0.0005 wt%, N 0.0056 wt%, P 0.005 wt%, S 0.004 wt%, and the balance is iron.

[0048] The billet rolling method includes sending a slab of 35 mm x 170 mm x 160 mm to a four-roll reversing rolling mill with a diameter of φ450 mm for rolling. First, heat the slab to 1230°C for 2 hours to make the billet completely austenitized; the rolling start temperature is 1094°C, and the final rolling temperature is 942°C; the rolling pass is 5 times, and each pass uses The thickness of strip steel is 28 mm, 22 mm, 17 mm, 13 mm and 12 mm; air...

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Abstract

The invention discloses a fire-resistant steel which comprises bainite and ferrite, wherein the volume percentage of bainite in the fire-resistant steel is 20-40% and the volume percentage of bferrite in the fire-resistant steel is 60-80% by taking the total volume of steel metallographic structure composition as the reference; the fire-resistant steel comprises the following chemical compositions by taking the total amount of the fire-resistant steel as the reference and calculating by simple substance: 0.05-0.12 wt% of C, 0.1-0.5 wt% of Si, 0.3-1.6 wt% of Mn, 0.05-0.12 wt% of V, 0.1-0.6 wt%of Cr, 0.2-0.4 wt% of Mo, 0.0005-0.002 wt% of B, 0.003-0.015 wt% of N, less than or equal to 0.02 wt% of P, less than or equal to 0.01 wt% of S and 97.0-99.1 wt% of Fe. The invention also provides the preparation method of the fire-resistant steel. The fire-resistant steel provided by the invention has lower constant-temperature yield ratio and higher high-temperature yield strength, totally conforms to the technical index requirements of fire-resistant steel and has low production cost.

Description

technical field [0001] The invention relates to a fire-resistant steel and a preparation method thereof. Background technique [0002] Architectural steel structure is an important application field of steel materials, which requires steel to have good room temperature mechanical properties and welding properties. Since the "9.11" incident in the United States, the fire performance of steel used in steel structures has attracted great attention from the government and design departments. The yield strength of ordinary steel drops rapidly to less than 1 / 2 of the room temperature yield strength at 350°C, which cannot meet the structural fire resistance design requirements, and a thicker fireproof coating must be sprayed on its surface. In order to reduce costs and speed up construction progress, a series of fire-resistant steels for construction with a fire-resistant temperature of 600 °C have been developed at home and abroad. On the basis of good room temperature performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/32C21D8/00B21B37/16C22C33/04C21C7/06
Inventor 刘庆春郑之旺程兴德陈杰李聪杨金成
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD