A kind of steel 35crnimo used for large-scale steel tie rods for bridges and its production method
A production method and large-scale technology, applied to the steel 35CrNiMo used for large-scale steel tie rods for bridges and its production field, can solve the problems of low-temperature impact toughness and mechanical properties that do not meet the requirements of use, so as to reduce construction costs and improve The effect of construction efficiency
Active Publication Date: 2022-04-26
青海西钢特殊钢科技开发有限公司 +1
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Problems solved by technology
With the continuous optimization of bridge structure, large-scale, and deteriorating service environment, the material specifications and mechanical properties of ordinary tie rods obviously do not meet the requirements of use, especially the low-temperature impact toughness does not meet the steel requirements for tie rods of modern large-scale suspension bridges.
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Embodiment
[0060] This embodiment relates to a production method of steel 35CrNiMo for large-scale steel tie rods for bridges, including:
[0061] Smelting→continuous casting→insulation (red delivery)→rolling→process water penetration→rack cooling→pit cold insulation→(finishing)→flaw detection→inspection, inspection→packaging and delivery.
[0062] (1) Continuous casting slab smelting and casting
[0063] The smelting adopts Consteel electric furnace + LF refining + VD degassing + 410mm×530mm three-machine three-strand bloom continuous casting.
[0064] Ingredients: molten iron + steel scrap, ferroalloy should be baked, nickel plate needs to be annealed, the furnace load should be controlled at 50-80 tons, of which the proportion of molten iron should be controlled at 60-80%, and the amount of scrap steel should be controlled at 20-40%.
[0065]Wherein, the Consteel electric furnace smelting specifically includes: adding 500-800 kg of lime and 200-400 kg of dolomite to the electric furn...
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The invention provides a kind of steel 35CrNiMo for large-scale steel tie rods used in bridges and a production method thereof; comprising the following steps: smelting→continuous casting→heat preservation (red delivery)→rolling→process water penetration→rack cooling→pit cooling and heat preservation→ (finishing)→flaw detection→inspection, inspection→packaging and delivery. The steel products produced by the method of the present invention can fully meet the steel material selection requirements for large-scale steel tie rods used in large bridges, and will have significant effects on the safe and stable construction of large bridges, improve construction efficiency, and reduce construction costs, and will be beneficial to the long-term development of large bridge construction. is of great significance.
Description
technical field [0001] The invention belongs to the field of new materials; in particular, it relates to a steel 35CrNiMo for large-scale steel tie rods used in bridges and a production method thereof. Background technique [0002] my country's social economy has entered into high-quality development, and the development of the transportation industry has also tended to mature. Bridge construction has developed from ordinary to large-scale, land to cross-sea, etc. The continuous changes in bridge structure and service environment have raised great challenges for the raw materials used in bridge construction. high demands. As a key component of the bridge, steel tie rods play a very important role in the operation safety of the bridge. The commonly used steel tie rod materials in my country mainly include 40Cr, 35-42CrMo and other steels, and the steel specifications are generally not larger than φ80mm. With the continuous optimization of bridge structure, large-scale, and de...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/42C22C38/06C21C7/076C21D8/06C21D1/18
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/42C22C38/06C21C7/076C21D8/065C21D1/18C21D2211/009C21D2211/005C21D2211/002Y02P10/20
Inventor 梅国俊王海龙杨国王磊英宋孟军钱才让胡发贵王芝林赵海东张喜庆
Owner 青海西钢特殊钢科技开发有限公司