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Low-temperature impact resistant angle steel for power transmission iron tower

A technology for transmission towers and low temperature resistance is applied in the field of angle steel, which can solve the problems of increasing the number and specifications of iron tower rods, increasing installation workload, and increasing engineering investment, and achieves low production costs, simple manufacturing processes, and good mechanical properties. Effect

Inactive Publication Date: 2014-01-22
ANHUI HONGYUAN LINE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the design load of the components is large, the method of combined section is generally used to meet the bearing capacity requirements of the tower components, which will inevitably lead to an increase in the number and specifications of the tower members, complex node structures, and increased installation workload, resulting in an increase in project investment. and waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Low-temperature impact-resistant angle steel for power transmission towers, the chemical composition of the angle steel is: C: 0.10%, Mn: 1.50%, Si: 0.03%, V: 0.05%, Ni: 0.05%, Ca: 0.003%, Cr: 0.1%, Cu: 0.2%, P: 0.2%, Mo: 0.30%, S: 0.01%, and the rest is Fe.

[0018] The preparation process is as follows:

[0019] (1) Initial refining: control the tapping temperature at 1600-1700°C;

[0020] (2) Converter refining: control the refining time at 15-20 minutes;

[0021] (3) Casting after vacuum deoxidation to obtain billets;

[0022] (4) Heating the steel slab to 1200-11250°C for ten times of hot rolling to obtain angle steel, the final rolling temperature is between 850-900°C, and air-cooled.

[0023] Take tensile and impact samples along the longitudinal direction of the angle steel, strictly implement GB / T3808, adopt pendulum type impact testing machine, adopt GB / T13239-2006 low temperature tensile test method to carry out low temperature tensile performance test, th...

Embodiment 2

[0025] Low-temperature impact-resistant angle steel for power transmission towers, the chemical composition of the angle steel is: C: 0.10%, Mn: 1.50%, Si: 0.03%, V: 0.06%, Ni: 0.03%, Ca: 0.004%, Cr: 0.15%, Cu: 0.15%, P: 0.02%, Mo: 0.25%, S: 0.015%, and the rest is Fe.

[0026] The preparation process is as follows:

[0027] (1) Initial refining: control the tapping temperature at 1600-1700°C;

[0028] (2) Converter refining: control the refining time at 15-20 minutes;

[0029] (3) Casting after vacuum deoxidation to obtain billets;

[0030] (4) Heating the steel slab to 1200-11250°C for ten times of hot rolling to obtain angle steel, the final rolling temperature is between 850-900°C, and air-cooled.

[0031] Take tensile and impact samples along the longitudinal direction of the angle steel, strictly implement GB / T3808, adopt pendulum type impact testing machine, adopt GB / T13239-2006 low temperature tensile test method to carry out low temperature tensile performance test...

Embodiment 3

[0033] Low-temperature impact-resistant angle steel for power transmission towers, the chemical composition of the angle steel is: C: 0.08%, Mn: 1.20%, Si: 0.02%, V: 0.03%, Ni: 0.02%, Ca: 0.003%, Cr: 0.05%, Cu: 0.10%, P: 0.02%, Mo: 0.20%, S: 0.010%, and the rest is Fe.

[0034] The preparation process is as follows:

[0035] (1) Initial refining: control the tapping temperature at 1600-1700°C;

[0036] (2) Converter refining: control the refining time at 15-20 minutes;

[0037] (3) Casting after vacuum deoxidation to obtain billets;

[0038] (4) Heating the steel slab to 1200-11250°C for ten times of hot rolling to obtain angle steel, the final rolling temperature is between 850-900°C, and air-cooled.

[0039] Take tensile and impact samples along the longitudinal direction of the angle steel, strictly implement GB / T3808, adopt pendulum type impact testing machine, adopt GB / T13239-2006 low temperature tensile test method to carry out low temperature tensile performance test, ...

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Abstract

The invention discloses low-temperature impact resistant angle steel for a power transmission iron tower. The angle steel comprises the following chemical components in percentage by weight: 0.05-0.15% of C, 1.20-1.60% of Mn, 0.01-0.05% of Si, 0.02-0.10% of V, 0.02-0.06% of Ni, 0.001-0.005% of Ca, 0.01-0.20% of Cr, 0.10-0.25% of Cu, 0.01-0.03% of P, 0.20-0.35% of Mo, 0.005-0.02% of S and the balance of Fe. The angle steel disclosed by the invention is pure in steel quality and stable in structure, has excellent low-temperature flexibility and good mechanical properties, and the result of a low-temperature tensile property test performed by a GB / T13239-2006 low-temperature tensile test method shows that the yield strength of the angle steel is greater than 350MPa.

Description

technical field [0001] The invention relates to an angle steel, in particular to a low-temperature impact-resistant angle steel for a power transmission tower. Background technique [0002] Low-temperature steel is an alloy steel suitable for applications below 0°C. Low-temperature steel should mainly have the following properties: ①The ductile-brittle transition temperature is lower than the service temperature; ②The strength meets the design requirements; ③The structure is stable at the service temperature; The application also requires extremely low magnetic permeability, cold shrinkage, etc. According to the type of crystal lattice, low-temperature steel can be generally divided into two categories: body-centered cubic ferritic low-temperature steel and face-centered cubic austenitic low-temperature steel. [0003] Among them, the total content of alloy elements in ferritic low-temperature steel is 5-10%, and the structure depends on the heat treatment system. 9Ni st...

Claims

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Application Information

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IPC IPC(8): C22C38/46
Inventor 阮元彤董广金王森林
Owner ANHUI HONGYUAN LINE EQUIP
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