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Low-temperature-resistant hot-rolled angle steel and preparation method thereof

A technology of low temperature resistance and angle steel, applied in the field of metallurgy, can solve the problems of increased brittleness of steel and cold brittleness at low temperature, and achieve the effects of good low temperature resistance, stable alloy recovery rate and simple process control.

Inactive Publication Date: 2016-07-06
宣化钢铁集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Structural steel exhibits good toughness at room temperature, but the brittleness of steel increases at low temperatures, and low-temperature cold brittleness is prone to occur

Method used

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  • Low-temperature-resistant hot-rolled angle steel and preparation method thereof
  • Low-temperature-resistant hot-rolled angle steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The chemical composition weight percent of the low temperature resistant angle steel in this embodiment is: C: 0.15%, Si: 0.25%, Mn: 1.60%, V: 0.045%, Al: 0.005%, N: 0.007%, O: 0.005%, P: 0.012%, S: 0.008%, the balance is Fe and unavoidable impurities (see Table 1), and the mechanical properties of rolled products are shown in Table 2.

[0040] The preparation method is as follows:

[0041] 1) Pre-desulfurization of molten iron: the molten iron arrives at the desulfurization station, and the sulfur content in the molten iron is guaranteed to be 0.008wt% after desulfurization;

[0042] 2) Converter smelting: Red net magnesia bricks are used, and the baking temperature is 800°C; silicon manganese, vanadium iron, and medium manganese are used for alloying, and the alloy composition is controlled according to the middle limit; aluminum manganese iron is used for deoxidation; slag is added during tapping The modifier is 1.0kg. When the molten steel reaches 1 / 4, the alloy is...

Embodiment 2

[0048] The weight percent of the chemical composition of the low temperature resistant angle steel obtained in this example is as follows: C: 0.14%, Si: 0.45%, Mn: 1.30%, V: 0.040%, Al: 0.006%, N: 0.008%, O: 0.004%, P : 0.014%, S: 0.007%, the balance is Fe and unavoidable impurities (see Table 1), and the mechanical properties of rolled products are shown in Table 2.

[0049] The preparation method is as follows:

[0050] 1) Pre-desulfurization of molten iron: the molten iron arrives at the desulfurization station, and the sulfur content in the molten iron is guaranteed to be 0.007wt% after desulfurization;

[0051] 2) Converter smelting: Red net magnesia bricks are used, and the baking temperature is 820°C; silicon manganese, vanadium iron, and medium manganese are used for alloying, and the alloy composition is controlled according to the middle limit; aluminum manganese iron is used for deoxidation; slag is added during tapping The modifier is 1.0kg. When the molten steel ...

Embodiment 3

[0056] The weight percent of the chemical composition of the low temperature resistant angle steel obtained in this example is as follows: C: 0.13%, Si: 0.36%, Mn: 1.34%, V: 0.055%, Al: 0.01%, N: 0.007%, O: 0.005%, P : 0.014%, S: 0.008%, the balance is Fe and unavoidable impurities (see Table 1), and the mechanical properties of rolled products are shown in Table 2.

[0057] The preparation method is as follows:

[0058] 1) Pre-desulfurization of molten iron: the molten iron arrives at the desulfurization station, and the sulfur content in the molten iron is guaranteed to be 0.008wt% after desulfurization;

[0059] 2) Converter smelting: Red net magnesia bricks are used, and the baking temperature is 850°C; silicon manganese, vanadium iron, and medium manganese are used for alloying, and the alloy composition is controlled according to the middle limit; aluminum manganese iron is used for deoxidation; slag is added during tapping The modifier is 1.0kg. When the molten steel r...

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Abstract

The invention discloses low-temperature-resistant hot-rolled angle steel and a production method thereof, and belongs to the technical field of metallurgy. The angle steel consists of the following chemical components in percentage by mass: 0.10-0.15% of C, 0.20-0.50% of Si, 1.3-1.7% of Mn, 0.04-0.06% of V, 0.005-0.015% of Al, less than or equal to 0.01% of N, less than or equal to 0.006% of O, less than or equal to 0.020% of P, less than or equal to 0.010% of S and the balance Fe and inevitable impurities. The production method for the low-temperature-resistant hot-rolled angle steel comprises the following steps: molten iron pre-desulfurization, converter smelting, LF refining, and a continuous-casting and rolling process by a billet continuous casting machine, wherein sulfur content of the molten iron after desulfurization is less than or equal to 0.005wt%. According to the low-temperature-resistant hot-rolled angle steel and the production method thereof, a vanadium micro-alloying process and a steelmaking process are adopted, the control is simple and the alloy recovery rate is stable. The low-temperature-resistant hot-rolled angle steel is good in performance, and has impact energy greater than or equal to 100J at a temperature of (-)40 DEG C.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-temperature-resistant hot-rolled angle steel and a preparation method thereof. Background technique [0002] With the development of economy and technology, steel structures are more and more used in various fields of the national economy due to their advantages of economical applicability, environmental friendliness, and quick construction, and have attracted wide attention from various industries. Its wide range of use and lightweight requirements also put forward higher requirements for steel properties, such as higher strength, lower content of alloy elements, and adaptability to extreme weather conditions. [0003] Especially in recent years, with the rapid development of China's economy, the demand for electricity is increasing day by day. The electric power industry is the basic industry of our country's national economy. As a secondary energy source...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/06C22C38/02C22C33/06C21C1/02C21D8/00
CPCC22C38/04C21C1/02C21D8/005C22C33/06C22C38/02C22C38/06C22C38/12
Inventor 王宏斌沈俊杰姜碧涛王勇冯建航张昕刘大为高友仁王建忠张全
Owner 宣化钢铁集团有限责任公司
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