Weathering resistant steel and steel plate and angle steel manufacture methods by adopting weathering resistant steel

A technology of weathering steel and angle steel, applied in the field of weathering steel and its steel plate production, angle steel production, can solve the problems of atmospheric and soil environmental pollution, frequent and complicated maintenance process, complicated and time-consuming processing process, etc., and achieve mechanical and anti-corrosion performance improvement, obvious Economic benefits and environmental protection, the effect of reducing anti-corrosion maintenance costs

Pending Publication Date: 2020-04-17
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the passage of time, the metal materials in the transmission towers have gradually exposed many problems and defects.
[0003] At present, many transmission towers are easy to rust and corrode, and need to reach a certain thickness to meet the strength requ

Method used

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  • Weathering resistant steel and steel plate and angle steel manufacture methods by adopting weathering resistant steel
  • Weathering resistant steel and steel plate and angle steel manufacture methods by adopting weathering resistant steel
  • Weathering resistant steel and steel plate and angle steel manufacture methods by adopting weathering resistant steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] This example provides two kinds of weathering steels, namely Q345 weathering angle steel and Q420 weathering angle steel, which respectively contain Fe and unavoidable impurities, and see Table 1 for the remaining components.

[0039] Table 1 Chemical composition list (wt%) of two kinds of weathering steel angle steels

[0040]

[0041] The tensile, impact and bending mechanical properties of the above two weather-resistant angle steels provided in this example were tested respectively, and the results are shown in Table 2.

[0042] Table 2: Test results of mechanical properties of two weathering steels

[0043]

[0044] It can be seen from the above table that the tensile, impact and bending mechanical properties of Q345 weather-resistant angle steel and Q420 weather-resistant angle steel are very excellent, which have been significantly improved compared with the existing angle steel.

[0045] The Q420 weather-resistant angle steel and the Q...

Example Embodiment

[0047] Example 2

[0048] Based on the same inventive concept, the present invention also provides a steel plate forming method of the above-mentioned weathering steel, the method comprising the following steps:

[0049] (1) LF refining and RH vacuum treatment and continuous casting are carried out successively after the weathering steel molten steel is smelted in a converter or an electric furnace;

[0050] (2) Roughly rolling the billet after continuous casting to 9 to 15 times the thickness of the finished product and finish rolling at 1200-1300°C according to the time requirement of 1.5min / mm; the entrance temperature of the finish rolling is 980-620°C, The final rolling temperature is 890-900°C;

[0051] (3) The steel plate after finish rolling is laminarly cooled according to the front cooling mode and coiled into coils at 580-620 ° C, and then kept for 1 hour after coiling and then air-cooled.

Example Embodiment

[0052] Example 3

[0053]Based on the same inventive concept, the present invention also provides a method for forming an angle steel of the above-mentioned weathering steel, the method comprising the following steps:

[0054] (1) LF refining and RH vacuum treatment and continuous casting are carried out successively after the weathering steel molten steel is smelted in a converter or an electric furnace;

[0055] (2) Heat the billet after continuous casting at 1200-1300°C for 1.5 min / mm and then carry out rough rolling and profile rolling in sequence.

[0056] The profile rolling adopts 4 butterfly pass rolling mills with vertical rolling to carry out 4 rolling, and the 4 rolling mills are respectively BD1, BD2, F1, F2;

[0057] The BD2 and F1 use a common guide;

[0058] The F2 entrance adopts a rolling guide, and the rolling guide includes a total of three guide wheels, one up and two down.

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Abstract

The invention provides a weathering resistant steel and steel plate and angle steel manufacture methods by adopting the weathering resistant steel. The weathering resistant steel comprises, by mass, 0.05-0.20% of C, 0.20-0.40% of Si, 0.80-1.60% of Mn, 0.05-0.80% of Cu, 0.05-0.85% of Cr, 0.01-0.1% of Nb, 0.15-0.70% of Ni, smaller than or equal to 0.12% of Ti, smaller than or equal to 0.30% of Mo, smaller than or equal to 0.12% of V, smaller than or equal to 0.15% of Zr, smaller than or equal to 0.03% of P, smaller than or equal to 0.006% of S, 0.01-0.05% of Al, 0.002-0.005% of N, smaller than or equal to 0.002% of O and the balance Fe and unavoidable impurities. The weathering resistant steel has excellent corrosion resistance performance and excellent mechanical properties such as stretching, impact and bending and can meet the mechanical demand of application in a power transmission and transformation iron tower after being thinned, the cost of raw materials is lowered, the power transmission iron tower adopting the weathering resistant steel does not need the processing cost of hot galvanizing, and the anticorrosion maintenance cost in the later period can also be reduced, whichhelps to reduce the construction cost. In addition, the hot-dip galvanizing process is omitted, and the pollution to the atmosphere and soil environments is reduced. The weathering resistant steel hasobvious economic benefits and an environment protection effect, the mechanical properties and the corrosion resistance performance of the weathering resistant steel are improved, and the service lifeof the weathering resistant steel is greatly prolonged.

Description

technical field [0001] The invention relates to raw materials used in power transmission and transformation projects and a forming process thereof, in particular to a weather-resistant steel and its steel plate manufacturing method and angle steel manufacturing method. Background technique [0002] With the development of scientific and technological progress, more and more materials and products have been developed unprecedentedly. In production and life, metal materials are widely used and have been irreplaceable in many fields. The demand for metals in power transmission and transformation projects continues to grow, especially non-metallic materials for the construction of power transmission towers. However, with the passage of time, the metal materials in the transmission towers have gradually exposed many problems and defects. [0003] At present, many transmission towers are easy to rust and corrode, and need to reach a certain thickness to meet the strength require...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/48C22C38/50C22C38/44C22C38/46C22C38/06C22C33/04C21D8/02
CPCC22C38/02C22C38/04C22C38/42C22C38/48C22C38/50C22C38/44C22C38/46C22C38/06C22C38/001C22C33/04C21D8/0205Y02P10/20
Inventor 黄耀韩军科刘蔚宁李峰吴静汪长智王旭明王景朝胡晓光王飞罗义华汪和龙王自成平朗吴赛黄国杨风利张宏杰
Owner CHINA ELECTRIC POWER RES INST
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