Manufacturing method of rare earth microalloyed weather-resistant bridge steel for alpine regions
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of micro-alloying and manufacturing method, applied in the direction of metal rolling, etc., can solve the problem of little research on steel plate
Inactive Publication Date: 2021-11-19
BAOTOU IRON & STEEL GRP
View PDF8 Cites 2 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0003] Rare earth elements are characteristic resources in Baotou. With the promotion of capacity reduction and transformation and upgrading of the iron and steel industry in recent years, it is bound to become an important topic to give full play to the advantages of rare earth resources and improve...
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0030] Q345qD-RE bridge steel plate production process, the composition and mass percentage of steel are: C=0.072, Si=0.32, Mn=1.46, P=0.016, S=0.004, Als=0.022, Nb=0.028, Ti=0.011, Gr =0.027, Mo=0.003, Ni=0.020, Cu=0.020, Ce=0.0200.
[0031] The main process steps and parameters are as follows:
[0032] The molten iron must be pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is ≤0.010%, and the temperature is ≥1250°C. The slag must be cleaned before the molten iron enters the converter. About 85%, scrap about 15%. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%, strict slag blocking and tapping, tapping time 4-7min, adding alloy at 1 / 5 of tapping, adding alloy at 2 / 5 of tapping, During the tapping process, depending on the oxygen content at the end point, add an appropriate amount of modifier and lime, the oxygen should not be less than 250m, and make appropriate adjustments depending on the loading a...
Embodiment 2
[0043] Q345qD-RE bridge steel plate production process, the composition and mass percentage of steel are: C=0.071, Si=0.32, Mn=1.41, P=0.012, S=0.003, Als=0.023, Nb=0.025, Ti=0.011, Gr =0.028, Mo=0.004, Ni=0.019, Cu=0.016, Ce=0.0370.
[0044] The main process steps and parameters are as follows:
[0045] The molten iron must be pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is ≤0.010%, and the temperature is ≥1250°C. The slag must be cleaned before the molten iron enters the converter. About 85%, scrap steel about 15%. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%, strict slag blocking and tapping, tapping time 4-7min, adding alloy at 1 / 5 of tapping, adding alloy at 2 / 5 of tapping, During the tapping process, depending on the oxygen content at the end point, add an appropriate amount of modifier and lime, the oxygen should not be less than 250m, and make appropriate adjustments depending on the loa...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention discloses a manufacturing method of rare earth microalloyed weather-resistant bridge steel for alpine regions. Compared with the prior art, the method has the advantages that a mode of adding rare earth is different, and by adding rare earth wires containing rare earth cerium Ce in the slab casting process, the defect of low rare earth yield caused by addition of rare earth alloy in the RH refining process is overcome, and the rare earth element yield is greater than 80%; and secondly, the rare earth content of a bridge steel plate is greater than 60 ppm, the low-temperature impact performance of the steel plate is improved through the high rare earth content, weather resistance is improved, and the long-time cognition that only a small amount of rare earth (0-10 ppm) can generate beneficial improvement on the steel plate and on the contrary, addition of a large amount of rare earth can generate inclusions to affect the performance of the steel plate is subverted to a certain extent.
Description
technical field [0001] The invention relates to the technical field of medium-thick plate manufacturing, in particular to a method for manufacturing rare-earth microalloyed weather-resistant bridge steel for alpine regions. Background technique [0002] In recent years, the development of the transportation industry has led to great progress in bridge construction in my country. The large-scale construction of various highway bridges, railway bridges, and sea-crossing bridges has created a huge market for bridge steel. The performance of bridge steel puts forward higher requirements. High strength, high toughness, excellent weldability, corrosion resistance and fatigue resistance have become the characteristics that high-performance bridge steel should possess. At the same time, the change of bridge design concepts and the increasing requirements for bridge manufacturing cycle and other aspects, the traditional structural steel plate can no longer fully meet the requirements ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more