Cold-resistant high-strength hot-rolled angle steel and production method thereof

A high-strength, angle steel technology, applied in metal rolling and other directions, can solve the problems of low strength and poor toughness of angle steel, and achieve the effect of good toughness

Inactive Publication Date: 2012-09-19
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention overcomes the shortcomings of low strength and poor toughness of the angle steel used in the construction of transmission towers at present, and provides a hot-rolled angle steel with a yield strength ≥ 520MPa, elongation after fracture ≥ 22%, grain size ≥ 10, and a kind of cold-resistant high-strength hot-rolled angle steel with a side width of 280 mm and above, and its production method

Method used

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  • Cold-resistant high-strength hot-rolled angle steel and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Production of equilateral angle steel with a side length of 280 mm, its composition and weight percentage content: C: 0.06%, Si: 0.20%, Mn: 1.50%, P: 0.0148%, S: 0.010%, V: 0.030%, Nb : 0.015%, Ni: 0.60%, the rest is Fe and unavoidable impurities, and satisfies CEV= C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.356%≤0.40 %.

[0030] Its production steps:

[0031] 1) For smelting, the superheating degree of molten steel is 15°C; when the outflow of molten steel is 1 / 4, Ni is added in a set amount at one time;

[0032] 2) Carry out slagging, and control the alkalinity of slag at 3.6;

[0033] 3) Perform argon blowing for 4.5 minutes;

[0034] 4) Carry out continuous casting, control the pouring temperature at 1530-1535°C, and stir evenly with electromagnetic;

[0035] 5) Heating the slab, the heating temperature is 1220-1225°C;

[0036] 6) Carry out hot rolling, the starting rolling temperature is 1150-1155°C, the deformation is controlled at 850°C to 75%, and the final rolling te...

Embodiment 2

[0039] Production of equilateral angle steel with a side length of 290 mm, its composition and weight percentage content: C: 0.081%, Si: 0.28%, Mn: 1.420%, P: 0.0146%, S: 0.0096%, V: 0.042%, Nb : 0.026%, Ni: 0.22%, the rest are Fe and unavoidable impurities, and satisfy CEV= C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.34%≤0.40 %.

[0040] Its production steps:

[0041] 1) For smelting, the superheating degree of molten steel is 12°C; when the outflow of molten steel is 1 / 4, Ni is added in a set amount at one time;

[0042] 2) Carry out slagging, and control the alkalinity of slag at 3.8;

[0043] 3) Perform argon blowing for 5 minutes;

[0044]4) Carry out continuous casting, control the pouring temperature at 1540-1545°C, and stir evenly with electromagnetic;

[0045] 5) Heating the billet at a temperature of 1230-1235°C;

[0046] 6) Carry out hot rolling, the starting rolling temperature is 1160-1165°C, the deformation is controlled at 885°C to 78%, and the final rolling temperatur...

Embodiment 3

[0049] Production of equilateral angle steel with a side length of 300 mm, its composition and weight percentage content: C: 0.11%, Si: 0.36%, Mn: 1.35%, P: 0.0142%, S: 0.009%, V: 0.051%, Nb : 0.033%, Ni: 0.48%, the rest is Fe and unavoidable impurities, and satisfies CEV= C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.377%≤0.40 %.

[0050] Its production steps:

[0051] Production of equilateral angles with a side length of 300 mm,

[0052] 1) For smelting, the superheated degree of molten steel is 13°C; when the outflow of molten steel is 1 / 4, Ni is added in a set amount at one time;

[0053] 2) Carry out slagging, and control the alkalinity of slag at 4.0;

[0054] 3) Perform argon blowing for 6 minutes;

[0055] 4) Carry out continuous casting, control the pouring temperature at 1535-1540°C, and stir evenly with electromagnetic;

[0056] 5) Heating the billet, the heating temperature is 1245~1250℃;

[0057] 6) Carry out hot rolling, the starting rolling temperature is 1172-1177°C, ...

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Abstract

The invention relates to a cold-resistant high-strength hot-rolled angle steel and a production method thereof. The angle steel contains, by weight, 0.06%-0.20% of carbon (C), 0.20%-0.50% of silicon (Si), 1.10%-1.50% of manganese (Mn), phosphorus (p), sulphur (s), 0.030%-0.070% of vanadium(V), 0.015%-0.050% of niobium (Nb), and 0.10%-0.60% of nickel (Ni), wherein p <=0.015% and s <=0.010%. Carbon equivalent (CEV) =C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15<=0.40%. The process includes smelting, slagging, argon blowing, continuous casting, heating of casting blank, hot rolling and cooling to a room temperature. According to the cold-resistant high-strength hot-rolled angle steel and the production method thereof, requirements for a power transmission tower at -40 DEG C can be completely satisfied, the yield strength of the angle steel is larger than 550 MPa, the tensile strength of the angle steel is larger than or equal to 680 MPa, the elongation after fracture of the angle steel is larger than or equal to 24%, the Charpy impact energy at -40 DEGC is larger than or equal to 55J, and the grade of the prior austenite grain size is greater than or equal to 10 grade. The cold-resistant high-strength hot-rolled angle steel has the advantages of being high in strength, fine in grains and good in toughness, the production method can be used for producing the angle steel for an ultrahigh pressure power transmission tower, and the side width of the angle steel can be kept to be 280mm or more.

Description

technical field [0001] The invention relates to a section steel and a production method thereof, in particular to a cold-resistant high-strength hot-rolled angle steel and a production method thereof. Background technique [0002] Angle steel is mainly used in the construction of transmission towers. There are two kinds of construction materials for transmission towers: angle steel and round pipe. Angle steel is mainly used in DC line transmission towers, and steel pipe towers are mostly used in 1000 kV and above AC lines. Since transmission towers are mostly used in mountainous areas, the structure of steel pipe towers is complex, and angle steel towers are convenient for transportation and maintenance, and the cost is low. Considering factors such as transportation, maintenance, and cost, angle steel towers are more widely used. [0003] At present, my country's high-voltage and ultra-high-voltage iron towers are combined with double or four-piece small angle steels with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C33/04C21D8/00B21B1/09
Inventor 朱敏吉玉任安超吴杰田青周剑华刘卫永
Owner 武汉钢铁有限公司
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