A kind of low-temperature-resistant hot-rolled H-shaped steel and its preparation method

An H-beam, low-temperature-resistant technology, applied in the field of low-temperature-resistant hot-rolled H-beam and its preparation, can solve the problems of not too high strength level, low low temperature toughness, and insufficient use of V, and achieve excellent strength and toughness matching and The effect of low temperature resistance, low production cost and stable alloy recovery rate

Active Publication Date: 2017-05-17
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem is that although this steel type uses micro-alloyed Nb, the strength level is not too high, and the toughness at -40°C is not very high, and the production cost after adding Nb increases
[0005] Chinese patent application CN101760704A discloses a vanadium-containing economical high-strength and high-weather-resistant hot-rolled H-shaped steel, wherein the V content is 0.07% to 0.12%, but because it is less controlled in the steelmaking and continuous casting process, its low temperature The toughness is not very high, and the role of V in steel is not fully utilized
The composition design and process of Q345E and above high-strength and low-temperature resistant hot-rolled H-beams have not been reported at home and abroad.

Method used

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  • A kind of low-temperature-resistant hot-rolled H-shaped steel and its preparation method
  • A kind of low-temperature-resistant hot-rolled H-shaped steel and its preparation method
  • A kind of low-temperature-resistant hot-rolled H-shaped steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: according to the chemical composition requirement of steel in the present invention, the chemical composition obtained is shown in Table 1:

[0048] Table 1 Chemical composition of the steel in Example 1 (wt.%)

[0049]

[0050] End point of converter smelting [S]: 0.020%, [P]: 0.010%. The slag is blocked and the steel is tapped, and the thickness of the slag layer in the bag is 50mm. Add Al-Mn-Fe 4kg / t steel when placing steel. Add metal manganese, ferrosilicon, vanadium nitrogen for alloying.

[0051] Ladle into the station to add lime 8kg / t steel. Calcium carbide 2.5kg / t steel, aluminum particles, silicon calcium barium 3.0kg / t steel for slagging deoxidation. The basicity of refining process slag and final slag is 2.5. After taking the initial sample, fix the oxygen at 19ppm, feed the titanium wire 90m, and feed the wire speed ≥ 3m / s. The refining time is 31 minutes. Feed 150m of solid core calcium wire for calcification before soft blowing, a...

Embodiment 2

[0061] Embodiment 2: According to the chemical composition requirement of steel in the present invention, the chemical composition obtained is shown in Table 3:

[0062] Table 3 Chemical composition (wt.%) of the steel of Example 2

[0063]

[0064] End point of converter smelting [S]: 0.0:15%, [P]: 0.012%. The slag is blocked and the steel is tapped, and the thickness of the slag layer in the bag is 70mm. The amount of aluminum-manganese ferro-manganese added is 2.5kg / t steel when putting steel. Add metal manganese, ferrosilicon, vanadium nitrogen for alloying.

[0065] Ladle into the station to add lime 12kg / t steel. Calcium carbide 1.5kg / t steel, aluminum particles, silicon calcium barium 2.0kg / t steel for slagging deoxidation. The basicity of refining process slag and final slag is 3.0. After taking the initial sample, fix the oxygen at 15ppm, feed the titanium wire 80m, and feed the wire speed ≥ 3m / s. The refining time is 31 minutes. Before soft blowing, feed so...

Embodiment 3

[0070] Embodiment 3: According to the chemical composition requirement of steel in the present invention, the chemical composition obtained is shown in Table 5:

[0071] Table 5 The chemical composition (wt.%) of the steel of Example 3

[0072]

[0073] End point of converter smelting [S]: 0.016%, [P]: 0.010%. The slag is blocked and the steel is tapped, and the thickness of the slag layer in the bag is 60mm. The amount of Al-Mn ferro-manganese to be added is 3.5kg / t of steel. Add metal manganese, ferrosilicon and ferrovanadium for alloying.

[0074] Ladle into the station to add lime 10kg / t steel. Calcium carbide 2.0kg / t steel, aluminum particles, silicon calcium barium 2.5kg / t steel for slagging deoxidation. The basicity of refining process slag and final slag is 2.1. After taking the initial sample, fix the oxygen at 9ppm, then feed the titanium wire 60m, and the feeding speed is ≥3m / s. The refining time is 31 minutes. Before soft blowing, 120m of solid core calci...

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Abstract

The invention discloses a low-temperature-resistant hot-rolled H-shaped steel and a preparation method thereof. The hot-rolled H-shaped steel comprises the following chemical components in percentage by weight: 0.07-0.10% of C, 0.2-0.4% of Si, 1.30-1.60% of Mn, at most 0.020% of P, at most 0.015% of S, 0.015-0.070% of V, 0.010-0.030% of Ti, and the balance of Fe and inevitable impurities. The production method comprises the following steps: converter smelting, LF (ladle furnace) refining, continuous casting, rolling and the like. The structure of the H-shaped steel is a polygonal ferrite and pearlite structure, the yield strength is 350-450 MPa, the tensile strength is 480-600 MPa, the percentage elongation after fracture is greater than or equal to 22%, and the -40-DEG C V-notch Charpy impact energy is greater than or equal to 200J.

Description

technical field [0001] The invention belongs to the technical field of smelting low-temperature-resistant H-shaped steel, in particular, the invention relates to a low-temperature-resistant hot-rolled H-shaped steel and a preparation method thereof. Background technique [0002] my country started to build its own offshore oil platforms in the 1980s, and has developed rapidly in the exploitation of offshore oil and natural gas, which has also strongly promoted the demand for steel used in offshore oil drilling platforms. The demand for high-strength and low-temperature-resistant steel for offshore platforms is increasing, and my country's technical capabilities in this area are still relatively backward. There is an urgent need to develop a series of high-strength and high-toughness steel for offshore platforms with independent intellectual property rights. It is of far-reaching significance to make use of our country's sea area resources to realize the country's energy strat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14
CPCC22C38/02C22C38/04C22C38/12C22C38/14
Inventor 王中学韩蕾蕾于浩宋成浩李四军张学民杨栋
Owner SHANDONG IRON & STEEL CO LTD
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