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Low temperature resistant h-shaped steel and its production method

A production method and low temperature resistance technology, applied in the manufacture of converters, etc., can solve the problems of low temperature resistance performance, achieve the effect of improving low temperature resistance performance, improving product qualification rate, and stable production in large quantities

Active Publication Date: 2016-04-06
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The average longitudinal impact energy at -20°C is 90J, and its low temperature resistance performance is low, so it is necessary to further improve the low temperature resistance performance

Method used

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  • Low temperature resistant h-shaped steel and its production method
  • Low temperature resistant h-shaped steel and its production method
  • Low temperature resistant h-shaped steel and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the mass percentage, the composition of H-shaped steel is: C: 0.06%, Si: 0.29%, Mn: 1.47%, P: 0.011%, S≤0.003%, Nb: 0.030%, Ti: 0.022%, Al t : 0.021%, the rest is iron and unavoidable impurities.

[0035] The production method of the H-shaped steel with above-mentioned composition comprises the following steps:

[0036] 1) Pre-desulfurization: transport the molten iron to the desulfurization station, and the sulfur content in the molten iron after desulfurization is 0.015wt%.

[0037] 2) Converter smelting: 43t of molten iron and 7t of scrap steel are added to the converter as raw materials. After smelting is completed, 2kg·t is pre-pressed at the bottom of the ladle before tapping. -1 The amount of steel is added to the fully pre-fused synthetic slag, and the components of the fully pre-fused slag are SiO by mass percentage 2 : 1.86%, CaO: 52.10%, Al 2 o 3 : 44.69%, TFe: 1.35%; silicon-manganese alloying is carried out when 1 / 4 of the steel is tapped, ...

Embodiment 2

[0045] The composition of H-shaped steel according to mass percentage is: C: 0.07%, Si: 0.35%, Mn: 1.53%, P: 0.014%, S: 0.006%, Nb: 0.029%, Ti: 0.025%, Al t : 0.018%, the rest is iron and unavoidable impurities.

[0046] The production method of the H-shaped steel with above-mentioned composition comprises the following steps:

[0047] 1) Pre-desulfurization: Transport the molten iron to the desulfurization station. After desulfurization, the sulfur content in the molten iron is 0.012wt%.

[0048] 2) Converter smelting: 45t of molten iron and 7t of scrap steel are added to the converter as raw materials. After the smelting is completed, 2kg·t is pre-pressed at the bottom of the ladle before tapping. -1 The amount of steel is added to the fully pre-fused synthetic slag, and the components of the fully pre-fused slag are SiO by mass percentage 2 : 1.86%, CaO: 52.10%, Al 2 o 3 : 44.69%, TFe: 1.35%; silicon-manganese alloying is carried out when 1 / 4 of the steel is tapped, and a...

Embodiment 3

[0057] The composition of H-shaped steel according to mass percentage is: C: 0.09%, Si: 0.38%, Mn: 1.55%, P: 0.011%, S: 0.005%, Nb: 0.029%, Ti: 0.021%, Al t : 0.019%, the rest is iron and unavoidable impurities.

[0058] The production method of the H-shaped steel with above-mentioned composition comprises the following steps:

[0059] 1) Pre-desulfurization: transport the molten iron to the desulfurization station, and the sulfur content in the molten iron after desulfurization is 0.015wt%.

[0060] 2) Converter smelting: 45t of molten iron and 7t of scrap steel are added to the converter as raw materials. After smelting, 2kg·t is used before tapping. -1 Add fully pre-melted synthetic slag to the amount of steel, carry out silicon-manganese alloying when 1 / 4 of the steel is tapped, and add deoxidizer Al-Mn-Fe alloy according to the amount of steel of 3.5kg / t; Niobium and aluminum composite microalloying, making Nb: 0.028% in molten steel, Al t : 0.005%. The composition of...

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Abstract

The invention discloses low temperature resistant H-shaped steel and a production method thereof. The low temperature resistant H-shaped steel comprises the following chemical components in percentage by weight: 0.05-0.11% of C, 0.25-0.50% of Si, 1.40-1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.025-0.035% of Nb, 0.015-0.030% of Ti, 0.015-0.030% of Alt and the balance of Fe and inevitable impurities. The production method of the low temperature resistant H-shaped steel comprises a molten iron pre-desulphurization step, a converter smelting step, an LF (Ladle Furnace) refining step, a continuous casting step by virtue of a billet caster and a rolling step. A Charpy V-notch impact test is adopted for measuring the low temperature resistant mechanical property of H-shaped steel, impact energy at the temperature of minus 20 DEG C is more than or equal to 144J, and impact energy at the temperature of minus 45 DEG C is more than or equal to 98J.

Description

technical field [0001] The invention belongs to the field of shaped steel, and in particular relates to a low-temperature-resistant H-shaped steel and a production method thereof. The production method is particularly suitable for the traditional AR rolling method. Background technique [0002] Steel damage can be divided into ductile fracture damage and brittle fracture damage. Ductile fracture is often accompanied by large deformation, which is easy to be found and early measures should be taken to stop it. However, there is no sign before brittle fracture, and it can reach 2km·s when it cracks. -1 speed, the damage is often catastrophic. It has attracted great attention due to its severe destructive consequences. Analyzing the damage examples of steel brittle fracture, it is found that the brittle fracture of steel often occurs at low temperature, which is called low temperature cold brittle phenomenon. In recent years, due to various researches on steel at low temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21C7/072C21C5/28B22D11/00
Inventor 王中学韩蕾蕾袁鹏举谷凤波
Owner LAIWU IRON & STEEL GRP
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