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350MPa-level low temperature resistant H-shaped steel and preparation method thereof

A technology of H-beam and low temperature resistance, which is applied in the field of steel to achieve the effect of improving low temperature resistance, ensuring low carbon requirements and good low temperature resistance.

Inactive Publication Date: 2015-01-21
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process requires low-temperature controlled rolling within the range of 850-920 °C, and the production equipment and process level control requirements are strict.

Method used

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  • 350MPa-level low temperature resistant H-shaped steel and preparation method thereof
  • 350MPa-level low temperature resistant H-shaped steel and preparation method thereof
  • 350MPa-level low temperature resistant H-shaped steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the process route of a 350MPa grade low-temperature resistant hot-rolled H-beam is:

[0036] Hot metal pre-desulfurization→converter smelting→LF refining→rectangular billet full protection continuous casting→1-7 rolling mill layout type production line rolling→inspection and storage.

[0037] Specifically:

[0038] 1) The molten iron arrives at the desulfurization station, and the sulfur content in the molten iron is guaranteed to be ≤0.008wt% after desulfurization;

[0039] 2) Converter smelting: the ladle is made of red net magnesia carbon bricks, and the baking temperature is ≥800°C; ferrosilicon, manganese metal, and ferroniobium are used for alloying, and the alloy composition is controlled according to the middle limit; ~4.0kg / t steel; add 1.0kg of slag modifier during the tapping process, start to add alloy evenly when the molten steel reaches 1 / 4, and finish adding when the molten steel reaches 3 / 4, and add the alloy to the impact ar...

Embodiment 2

[0050] The specifications of the production process, key points of control and rolled material are the same as in Example 1. See Table 3 for the weight percentage of the chemical composition of the obtained steel, and see Table 4 for the record table of the mechanical properties of the rolled product.

[0051] The product of this embodiment has higher strength and good low-temperature resistance, wherein the strength is 30MPa higher than the use requirement, and the low-temperature impact value at -40°C is the lowest 122J, with an average of 138.0J, indicating that the product of the present invention is still stable at -40°C. Has excellent toughness. Although the strength of the product in this implementation is lower than that of Example 1, its low temperature resistance is better, which can ensure the safety of the structure made of this product in the environment of -40°C.

[0052] Table 3: Chemical Composition Weight % of Steel

[0053] Example

C

Si

...

Embodiment 3

[0057] The specifications of the production process, key points of control and rolled material are the same as in Example 1. See Table 5 for the weight percentage of the chemical composition of the obtained steel, and see Table 6 for the record table of the mechanical properties of the rolled product.

[0058] The product of this embodiment has higher strength and good low-temperature resistance, wherein the strength is 35MPa higher than the use requirement, and the low-temperature impact value at -40°C is the lowest 84J, with an average of 111.3J, indicating that the product of the present invention is still stable at -40°C. It has excellent toughness, which can ensure the safety of the structure made of this product in the environment of -40 ℃.

[0059] Table 5: Chemical Composition Weight % of Steel

[0060] Example

C

Si

mn

P

S

V

Nb

Ti

3

0.08

0.35

1.35

0.015

0.005

0.02

0.025

0.015

[00...

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Abstract

The invention belongs to the technical field of steel, and particularly relates to 350MPa-level low temperature resistant H-shaped steel and a preparation method thereof. The 350MPa-level low temperature resistant H-shaped steel comprises the following chemical components in percentage by weight: 0.05-0.09% of carbon, 0.20-0.35% of silicon, 1.35-1.50% of manganese, 0.020-0.035% of niobium, 0.015-0.025% of vanadium, 0.005-0.025% of titanium, smaller than and equal to 0.020% of phosphorus, smaller than and equal to 0.015% of sulfur, and iron and inevitable impurities for balance. According to the 350MPa-level low temperature resistant H-shaped steel and the preparation method thereof, mainly through the low carbon content, and the application of niobium-titanium complex microalloying technology, the production of the 350MPa-level low temperature resistant H-shaped steel is realized; a prepared product has a yielding strength larger than 380 MPa, is good in low temperature resistant steel mechanical property, and has low-temperature (minus 40 DEG C) resistant longitudinal impact power larger than 76 J.

Description

technical field [0001] The invention belongs to the technical field of iron and steel. Specifically, the invention relates to a 350MPa grade low-temperature-resistant hot-rolled H-shaped steel and a preparation method thereof. Background technique [0002] Low-temperature resistant H-beams are mainly used in buildings, ships, bridges, power station equipment, water conservancy, energy, chemical industry, lifting and transportation machinery and other high-load steel structures in alpine regions. This steel contains less non-metallic materials and has the characteristics of impact resistance under low temperature conditions. [0003] Chinese invention patent application CN101255527A discloses a boron-added H-shaped steel with good low-temperature impact toughness and its preparation method. 0.55%, P≤0.025%, S≤0.025%, Nb0.015~0.035%, B0.0005~0.0012%, the balance is iron and trace impurities. During the smelting process, the gas content in the steel is controlled [N]≤0.004 %,...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21C7/04C21C7/06
CPCC21C7/04C21C7/06C22C33/04C22C38/02C22C38/04C22C38/12C22C38/14Y02P10/20
Inventor 袁鹏举付常伟李超韩蕾蕾谷凤波张佩赵传东赵新华方金林杨栋俎勇仝丽珍张学民宋玉卿赵圣功武玉利韩文习石磊
Owner SHANDONG IRON & STEEL CO LTD
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