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High-strength low alloy steel force transfer rod and manufacturing method thereof

A technology of low-alloy steel and manufacturing method, applied to roads, pavement details, roads, etc., can solve problems such as low strength of dowel bars, non-corrosion resistance, short fatigue life, etc., and achieve the effect of economic value and maintenance cost saving

Inactive Publication Date: 2017-05-31
浙江富钢集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of low strength, short fatigue life and non-corrosion resistance of existing dowel bars without increasing the cost of smelting; the purpose is to improve the service life of the product, especially the service life in a corrosive environment, so that Improve the service life of the project

Method used

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  • High-strength low alloy steel force transfer rod and manufacturing method thereof
  • High-strength low alloy steel force transfer rod and manufacturing method thereof
  • High-strength low alloy steel force transfer rod and manufacturing method thereof

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Embodiment Construction

[0026] The technological steps of embodiment 1~3 are: the first step: smelting

[0027] Electric furnace smelting, the tapping temperature is not lower than 1580°C, the tapping amount is 51.6t, and the alloying elements Mn and Cr are adjusted to the lower limit of the target value before tapping.

[0028] When the LF refining ladle is in place, it is energized to heat up, and the composition is fine-tuned to the required composition range of the finished product.

[0029] The continuous casting start temperature is the liquidus temperature plus 60-80°C. Continuous casting casts a 150mm×150mm square continuous casting billet with a billet length of 9000mm.

[0030] Step Two: Rolling

[0031] Heating process: The heating process adopts furnace insulation below 800°C, and the temperature is raised to 1160°C-1240°C at a speed of no more than 100°C / h, and then kept for more than 1.5 hours.

[0032] Rolling process: the starting rolling temperature is not lower than 1060°C; the f...

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Abstract

The invention discloses a high-strength low alloy steel force transfer rod. The force transfer rod comprises the following chemical elements in percentage by weight: 0.20-0.24% of carbon, silicon not more than 0.35%, 1.00-1.50% of manganese, nickel not more than 0.35%, 0.35-0.50% of chromium, molybdenum not more than 0.35%, 0.10-0.15% of vanadium, 0.05-0.20% of niobium, copper not more than 0.35%, sulfur not more than 0.035%, phosphorus not more than 0.035%, 0.018-0.025% of nitrogen, and the balance of iron. A coating force transfer rod is adopted; the data under general conditioners shows the initial cost is increased by 25-50% compared with general carbon steel; if accounted by the total project investment, the cost is increased only by 0.49-2.16%; but in consideration of long-time service life, the corrosion-resistant service life can reach 75 years or more; and if the saved maintenance cost at this time is calculated, the economical value is higher, and the force transfer rod is suitable for the national demands of sustainable development.

Description

[0001] Technical field: [0002] The technology relates to a low-alloy steel dowel bar and a manufacturing method thereof, in particular to the component design and manufacturing method of a high-strength low-alloy steel epoxy resin-coated dowel bar for construction engineering. [0003] Background technique: [0004] Dowel bars refer to the force-transmitting steel bars arranged in the center of the slab thickness at certain distances along the transverse joints of the cement concrete pavement. Its one end is fixed in one side plate, and the other end can slide in the adjacent side plate, and its function is to transmit the driving load between two road panels and prevent the wrong platform. Dowel bars have a very important impact on the long-term performance of cement concrete roads. Installing dowel bars at the joints can improve the load transfer capacity, effectively reduce the generation of staggered platforms, slab damage and transverse cracks, and greatly extend the use...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/44C22C38/46C22C38/48C22C38/42C22C38/22C22C38/24C22C38/26C22C38/20C22C33/04C21D8/08E01C11/14
CPCC22C38/04C21D8/08C22C33/04C22C38/02C22C38/20C22C38/22C22C38/24C22C38/26C22C38/42C22C38/44C22C38/46C22C38/48E01C11/14
Inventor 朱柏荣潘宜杰
Owner 浙江富钢集团有限公司
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