Efficient welding bridge steel and manufacturing method thereof
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A manufacturing method and bridge steel technology, applied in the field of iron and steel production, can solve problems such as weakening of welding and welding area strength, unqualified welding area flaw detection, and affecting mechanical properties of products, so as to avoid strength loss, eliminate adverse effects, and improve uniformity of structure sexual effect
Active Publication Date: 2021-08-10
NANJING IRON & STEEL CO LTD
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Larger inclusions become particles of impurities during the welding process to form large inclusions, resulting in unqualified flaw detection in the welding area. Large ferrite grains in the steel
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Embodiment 1
[0036] A high-efficiency welded bridge steel provided in this example has the following chemical composition and mass percentage: C: 0.06%, Si: 0.130%, Mn: 1.15%, P: 0.011%, S: 0.0020%, Nb: 0.026%, V: 0.016%, Ti: 0.017%, Cr: 0.02%, Ni: 0.19%, Mo: 0.01%, Cu: 0.03%, B: 0.0002%, Al: 0.029%, Mg: 0.0023%, N: 0.00350%, Ca is not added, and the balance is Fe and impurities.
[0037] Its manufacturing method comprises the following steps:
[0038] S1. Converter or electric furnace is used for molten steel smelting, the steel is fully deoxidized, and the aluminum content after the furnace is 0.041%;
[0039] S2. Using LF for desulfurization and slagging, alloying according to the composition design, without magnesium alloy treatment;
[0040] S3. Use RH or VD for vacuum treatment, feed magnesium aluminum wire after vacuum treatment, magnesium content is 0.0033%, and statically stir for 15 minutes after magnesium treatment;
[0047] A high-efficiency welded bridge steel provided in this example differs from Example 1 in that its chemical composition and mass percentage are as follows: C: 0.068%, Si: 0.23%, Mn: 1.35%, P: 0.011%, S: 0.00150%, Nb: 0.033%, V: 0.026%, Ti: 0.016%, Cr: 0.02%, Ni: 0.22%, Mo: 0.03%, Cu: 0.02%, B: 0.0001%, Al: 0.041%, Mg: 0.0021%, N: 0.0043%, no Ca is added, the balance is Fe and impurities.
Embodiment 3
[0049] A high-efficiency welded bridge steel provided in this example differs from Example 1 in that its chemical composition and mass percentage are as follows: C: 0.073%, Si: 0.23%, Mn: 1.44%, P: 0.010%, S: 0.0010%, Nb: 0.036%, V: 0.033%, Ti: 0.016%, Cr: 0.02%, Ni: 0.27%, Mo: 0.02%, Cu: 0.02%, B: 0.0001%, Al: 0.039%, Mg: 0.0013%, N: 0.0029%, no Ca is added, the balance is Fe and impurities.
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Abstract
The invention discloses efficient welding bridge steel and a manufacturing method thereof, and relates to the technical field of steel production. The efficient welding bridge steel comprises the following chemical components, by mass, 0.05%-0.08% of C, 0.10%-0.30% of Si, 1.10%-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.0050% of S, 0.020%-0.040% of Nb, 0.010%-0.040% of V, 0.006%-0.020% of Ti, less than or equal to 0.05% of Cr, 0.10%-0.30% of Ni, less than or equal to 0.05% of Mo, less than or equal to 0.05% of Cu, less than or equal to 0.0005% of B, 0.025%-0.050% of Al, 0.0010%-0.0030% of Mg, and less than or equal to 0.0050% of N,Ca is not added, and the balance is Fe and impurities. Fine dispersed inclusions taking magnesium oxide, magnesium sulfide and magnesium aluminate spinel as nucleation are generated through a metallurgical technology, and ferrite and a small amount of pearlite structures taking magnesium particles as nucleation conditions are obtained by adopting a TMCP rolling process and normalizing treatment, so that the welding performance of bridge steel is improved.
Description
technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a high-efficiency welded bridge steel and a manufacturing method thereof. Background technique [0002] With the development of my country's economy, the national infrastructure construction is becoming more and more perfect, and the construction of large bridges has reached the highest level in the world. The quality requirements of bridge steel are getting higher and higher. In the process of bridge construction, welding is required between steel materials. The quality of the welding area has a crucial impact on the overall quality of the bridge. Improving the weldability of bridge steel is of great significance to promote the development of the industry. [0003] In the process of product application, it is found that the factors that have a greater impact on welding come from the purity of molten steel and the grain size of the steel plate. Larger inclusion...
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