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320MPa low-temperature resistant hot-rolled H-shaped steel and preparation method thereof

A technology of low temperature resistant, H-beam steel, used in low temperature resistant low alloy structural steel and metallurgy field, to achieve the effect of improving low temperature resistance, reducing carbon increase in converter and ensuring low carbon requirements

Inactive Publication Date: 2014-06-04
LAIWU IRON & STEEL GRP
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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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  • 320MPa low-temperature resistant hot-rolled H-shaped steel and preparation method thereof
  • 320MPa low-temperature resistant hot-rolled H-shaped steel and preparation method thereof
  • 320MPa low-temperature resistant hot-rolled 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 320MPa 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 ≤0.010wt% 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 ferro-niobium are used for alloying, and the alloy composition is controlled according to the middle limit; ferro-aluminum manganese is used for deoxidation, and the addition amount is 2.5 ~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 f...

Embodiment 2

[0049] 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.

[0050] Table 3: Chemical composition weight percent of steel

[0051] Example

C

Si

mn

P

S

Nb

Ti

2

0.11

0.35

1.30

0.015

0.010

0.035

0.025

[0052] Table 4: Record table of mechanical properties of rolled products

[0053]

Embodiment 3

[0055] 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 material.

[0056] Table 5: Chemical composition weight percent of steel

[0057] Example

C

Si

mn

P

S

Nb

Ti

3

0.10

0.25

1.25

0.016

0.008

0.023

0.020

[0058] Table 6: Record table of mechanical properties of rolled products

[0059]

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Abstract

The invention discloses a 320MPa low-temperature resistant hot-rolled H-shaped steel and a preparation method thereof, the 320MPa low-temperature resistant hot-rolled H-shaped steel comprises the following chemical components by weight percent: 0.05-0.11% of C, 0.20-0.35% of Si, 1.05-1.30% of Mn, not more than 0.020% of P, not more than 0.015% of S, 0.020-0.035% of Nb, 0.005-0.025% of Ti, and the balanced of Fe and trace impurity. The production of the 320MPa low-temperature resistant hot-rolled H-shaped steel is realized by using niobium-titanium composite microalloying process through low-carbon content under the high hot-rolling temperature condition, the prepared low-temperature resistant steel is good in mechanical property, and the longitudinal impact is greater than 165J at -30 DEG C.

Description

technical field [0001] The invention relates to metallurgical technology, belongs to low-temperature-resistant low-alloy structural steel, and specifically relates to a 320MPa 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04
Inventor 付常伟王中学韩蕾蕾张涛方金林宋恒俊
Owner LAIWU IRON & STEEL GRP
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