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Tower connecting node, heat treatment method thereof and lightning protection tower for power transmission and transformation

A heat treatment method and technology for connecting nodes, applied in heat treatment furnaces, heat treatment equipment, configuration of grounding wires, etc., can solve problems such as impact performance drop, strength or hardness drop, etc.

Inactive Publication Date: 2022-03-11
HANGZHOU STEAM TURBINE CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the BSEN10293:2005 standard requires G24Mn6+QT2 materials to have a low-temperature impact of minus 30°C to 27J. Due to the harsh environment of the workpiece and the fact that the impact performance of the workpiece is reduced after structural welding and stress relief, it is required that the joints, etc. The low-temperature impact of castings at minus 30°C is higher than 27J, and it is required to be at least 35J
At the same time, when the composition of the casting is relatively fixed, different heat treatment methods will make the hardness, strength, toughness and ductility of the casting dynamically balanced, that is, an increase in a certain index (such as low temperature impact performance) will often lead to other indicators ( Such as strength or hardness, etc.) decreased

Method used

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  • Tower connecting node, heat treatment method thereof and lightning protection tower for power transmission and transformation
  • Tower connecting node, heat treatment method thereof and lightning protection tower for power transmission and transformation
  • Tower connecting node, heat treatment method thereof and lightning protection tower for power transmission and transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Use low-carbon and low-phosphorus stamping plate material as the melting raw material, then add ferroniobium, rare earth refining agent and diffusion deoxidizer, then add aluminum ingot for deoxidation, then blow in argon gas to purify molten steel, remove impurities, and cast to obtain G24Mn6 material Castings.

[0048] The inventor detected the cast parts, the main components are as follows: C: 0.22%, Si: 0.30%, Mn: 1.68%, Cr: 0.15%, Mo: 0.10%, Ni: 0.35%, Nb: 0.015%, P: 0.005 %, S: 0.002%, V: 0.02%, Cu: 0.10%.

[0049] Carry out preheating treatment on the castings, raise the temperature to 950°C, the heating rate is 65°C / h, soak for 6 hours, then air cool to below 200°C and then air cool to below 200°C; then quenching treatment, the preheated castings Raise the temperature to 930°C with a heating rate of 85°C / h, soak for 7 hours, then water-cool to below 100°C; then temper, raise the temperature of the quenched piece to 630°C with a heating rate of 70°C / h, hold the ...

Embodiment 2

[0053] Use low-carbon and low-phosphorus stamping plate material as the melting raw material, then add ferroniobium, rare earth refining agent and diffusion deoxidizer, then add aluminum ingot for deoxidation, then blow in argon gas to purify molten steel, remove impurities, and cast to obtain G24Mn6 material Castings.

[0054] The inventor detected the cast parts, the main components are as follows: C: 0.25%, Si: 0.50%, Mn: 1.75%, Cr: 0.15-0.25%, Mo: 0.15%, Ni: 0.40%, Nb: 0.015-0.025% , P: 0.005%, S: 0.002%, V: 0.02%, Cu: 0.10%.

[0055] Carry out preheating treatment on the casting, raise the temperature to 950°C, the heating rate is 100°C / h, soak for 7 hours, and then air cool to below 200°C; then quenching treatment, raise the temperature of the casting after preheating to 930°C, and heat up The speed is 100°C / h, soaking for 8h, then water cooling to below 100°C; then tempering treatment, the quenched piece is heated to 630°C, the heating rate is 100°C / h, isothermal for 1...

Embodiment 3

[0059] Use low-carbon and low-phosphorus stamping plate material as the melting raw material, then add ferroniobium, rare earth refining agent and diffusion deoxidizer, then add aluminum ingot for deoxidation, then blow in argon gas to purify molten steel, remove impurities, and cast to obtain G24Mn6 material Castings.

[0060] The inventor detected the cast parts, the main components are as follows: C: 0.24%, Si: 0.40%, Mn: 1.70%, Cr: 0.20%, Mo: 0.13%, Ni: 0.38%, Nb: 0.020%, P: 0.005 %, S: 0.002%, V: 0.02%, Cu: 0.10%.

[0061] Carry out preheating treatment on the casting, raise the temperature to 950°C, the heating rate is 80°C / h, soak for 7 hours, and then air cool to below 200°C; then quenching treatment, raise the temperature of the casting after preheating to 930°C, and heat up The speed is 90°C / h, soaking for 8h, then water cooling to below 100°C; then tempering, the quenched piece is heated to 630°C, the heating rate is 85°C / h, isothermal for 10h, and then water cooli...

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Abstract

The yield strength of the tower connecting joint is larger than or equal to 500 Mpa, the tensile strength ranges from 650 Mpa to 800 Mpa, and the impact toughness at the temperature of-30 DEG C is larger than or equal to 35 J. The invention further discloses a heat treatment method of the tower connecting node, which comprises the following steps: preheating a casting, air-cooling to below 200 DEG C, quenching, and tempering to obtain the tower connecting node. In the tempering treatment process, a water cooling mode is adopted for cooling to 100 DEG C or below. The lightning protection tower comprises a base, a tower body, cross arms, high-voltage wire suspension pieces and lightning rods, the tower body is located at the upper end of the base, the cross arms are symmetrically arranged on the two sides of the top of the tower body in the axial direction of the tower body, the high-voltage wire suspension pieces are symmetrically arranged below the cross arms in the axial direction of the tower body in a suspension mode, and the lightning rods are arranged on the tops of the cross arms. A bird repelling mechanism is arranged on the surface of the cross arm; wherein the tower body and the cross arm are assembled by adopting the tower connecting node.

Description

technical field [0001] The invention relates to the technical field of pole-tower connection nodes, in particular to a pole-tower connection node and a heat treatment method thereof, and a lightning protection pole for power transmission and transformation. Background technique [0002] Electricity is an indispensable energy source in today's society. With the extensive development of electric energy utilization, many countries are building large-capacity hydropower plants, thermal power plants, nuclear power plants, and power plant groups, and power resources are often far away from the load center. Only ultra-high voltage transmission In order to effectively and economically realize the power transmission task. EHV transmission can increase the transmission capacity and transmission distance, reduce the engineering cost of power transmission per unit power, reduce line loss, save the area of ​​line corridors, and have significant comprehensive economic and social benefits,...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/00C21D1/28C22C38/58C22C38/02C22C38/44C22C38/46C22C38/42C22C38/06C22C38/48C22C33/06C21C7/06H02G7/20H02G7/22
CPCC21D1/18C21D9/0068C21D1/28C22C38/58C22C38/02C22C38/44C22C38/46C22C38/42C22C38/06C22C38/48C22C33/06C21C7/06H02G7/20H02G7/22
Inventor 周黎明叶常晖石志康张健月俞卫松
Owner HANGZHOU STEAM TURBINE CASTING & FORGING
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