Low-compression-ratio hot-rolled steel sheet pile and preparation method thereof

A hot-rolled steel plate, low compression ratio technology, applied in the field of iron and steel metallurgy, to achieve the effect of easy operation, good toughness, and reduced rolling compression ratio

Inactive Publication Date: 2019-04-05
河北津西钢板桩型钢科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the existing low compression ratio hot-rolled steel sheet piles, it is difficult to obtain yield and tensile strength higher than the standard (≥10%), good toughness (elongation ≮20%) and high impact energy (normal temperature ≥70J), etc. In order to solve the problems of mechanical properties, the present invention provides a low compression ratio hot-rolled steel sheet pile and its preparation method

Method used

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  • Low-compression-ratio hot-rolled steel sheet pile and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A low compression ratio U-shaped hot-rolled steel sheet pile, the chemical composition of the hot-rolled steel sheet pile includes: C: 0.18%; Mn: 1.39%; Si: 0.28%; S: 0.009%; P: 0.026% ; Nb: 0.020%; the rest is Fe and unavoidable impurities. Rolling compression ratio: D / t=14.3, where, D—original billet thickness 150mm; t—finished product web thickness 10.5mm, grain size 9.5 class.

[0026] The preparation method of the above-mentioned steel sheet pile comprises the following steps:

[0027] (1) Converter or electric furnace smelting, add deoxidizer aluminum 1.0kg / ton of steel when tapping, consisting of 42% CaO; 35% Al 2 o 3 ; 8% Al; 5.5% SiO 2 ;5% Fe 2 o 3 ; 4% MgO; 0.5% H 2 The high-alumina refining slag composed of O is 2.8kg / ton of steel, refining in LF furnace, adding lime 7.0kg / ton of steel, fluorite 0.5kg / ton of steel and Nb alloy, refining for 18min, the temperature of molten steel rises to 1590°C, and feeds pure Calcium wire 1.0m / ton of steel, control th...

Embodiment 2

[0030] A low compression ratio linear hot-rolled steel sheet pile, the chemical composition of the hot-rolled steel sheet pile includes: C: 0.20%; Mn: 1.44%; Si: 0.31%; S: 0.006%; P: 0.018% ; Nb: 0.022%; the rest is Fe and unavoidable impurities. Rolling compression ratio: D / t=13.8, where, D—original billet thickness 180mm; t—finished product web thickness 13mm, grain size 10 .

[0031] The preparation method of the above-mentioned steel sheet pile comprises the following steps:

[0032] (1) Converter smelting, adding deoxidizer aluminum 1.5kg / ton of steel when tapping, consisting of 42% CaO; 35% Al 2 o 3 ; 8% Al; 5.5% SiO 2 ; 4% Fe 2 o 3 ; 5% MgO; 0.5% H 2 The high-alumina refining slag composed of O is 3.5kg / ton of steel, refining in LF furnace, adding lime 8.0kg / ton of steel, fluorite 1.5kg / ton of steel and Nb alloy, refining for 23min, the temperature of molten steel rises to 1585°C, and feeds pure The calcium wire is 1.2m / ton of steel, the temperature of the molten...

Embodiment 3

[0035] A low compression ratio U-shaped hot-rolled steel sheet pile, the chemical composition of the hot-rolled steel sheet pile includes: C: 0.22%; Mn: 1.60%; Si: 0.40%; S: 0.006%; P: 0.020% ; Nb: 0.033%; the rest is Fe and unavoidable impurities. Rolling compression ratio: D / t=11.6, where, D—original billet thickness 180mm; t—finished product web thickness 15.5mm, grain size 10.5 class.

[0036] The preparation method of the above-mentioned steel sheet pile comprises the following steps:

[0037] (1) Electric furnace smelting, adding deoxidizer aluminum 2.0kg / ton of steel when tapping, consisting of 42% CaO; 35% Al 2 o 3 ; 8% Al; 5.5% SiO 2 ;5% Fe 2 o 3 ; 4% MgO; 0.5% H 2 The high-alumina refining slag composed of O is 4.0kg / ton of steel, refining in LF furnace, adding lime 6.0kg / ton of steel, fluorite 1.5kg / ton of steel and Nb alloy, refining for 21min, the temperature of molten steel rises to 1575°C, and feeds pure The calcium wire is 1.5m / ton of steel, the temperat...

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Abstract

The invention relates to the technical field of steel metallurgy, and particularly discloses a low-compression-ratio hot-rolled steel sheet pile and a preparation method thereof. The low-compression-ratio hot-rolled steel sheet pile is prepared from the chemical composition of, by weight, 0.18-0.35% of C, 1.40-1.70% of Mn, 0.25-0.55% of Si, less than or equal to 0.010% of S, less than or equal to0.030% of P, 0.020-0.040% of Nb, and the balance being Fe and unavoidable impurities. The steel sheet pile has the low rolling compression ratio, more than or equal to 9.0 grade of the metallographic-structure grain size, the yield strength (greater than or equal to 416 MPa) and the tensile strength (greater than or equal to 550 MPa) that are higher than the standards, the good toughness, the higher impact energy (greater than or equal to 50 J under the normal temperature) and other mechanical properties.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a low compression ratio hot-rolled steel sheet pile and a preparation method thereof. Background technique [0002] Steel sheet piles began to be produced in Europe at the beginning of the 20th century, and were quickly widely used in various permanent and temporary projects in the construction industry, including ports, wharfs, river revetments, retaining walls, underground structures, etc. Due to the advantages of high strength, good toughness, good water resistance, high reuse rate, convenient construction, environmental protection and energy saving, hot-rolled steel sheet piles have become an important energy-saving and environmental-friendly steel product. [0003] With the wide application of hot-rolled steel sheet piles in domestic and foreign engineering circles, the technical level of design, manufacture and installation of steel sheet piles is also con...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21C7/06C21D8/02
CPCC21C7/06C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/12
Inventor胥明旺张春晖张学武叶高旗纪广胜马永福李建中王建景张玉峰杨雪松纪建华马云飞温小杰李永锋田志军张小进刘长江代永生张立恒
Owner河北津西钢板桩型钢科技有限公司