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A kind of high-efficiency welded bridge steel and its manufacturing method

A bridge and high-efficiency technology, which is applied in the field of high-efficiency welding bridge steel and its manufacturing, can solve the problems of welding and welding area strength weakening, welding area flaw detection unqualified, affecting product mechanical properties, etc., to avoid strength loss, eliminate adverse effects, Effect of improving tissue uniformity

Active Publication Date: 2022-05-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 plate will cause further growth of the grains during the welding process, resulting in welding and welding areas. The strength is weakened, which affects the mechanical properties of the product

Method used

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  • A kind of high-efficiency welded bridge steel and its manufacturing method
  • A kind of high-efficiency welded bridge steel and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

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;

[0041] S4. Continuous casting adopts ventilating nozzle to...

Embodiment 2

[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 a high-efficiency welded bridge steel and a manufacturing method thereof, and relates to the technical field of iron and steel production. 1.50%, P≤0.015%, S≤0.0050%, Nb: 0.020%~0.040%, V: 0.010%~0.040%, Ti: 0.006%~0.020%, Cr≤0.05%, Ni: 0.10%~0.30%, Mo≤0.05%, Cu≤0.05%, B≤0.0005%, Al: 0.025%~0.050%, Mg: 0.0010%~0.0030%, N≤0.0050%, Ca is not added, and the balance is Fe and impurities. Fine dispersed inclusions nucleated by magnesia, magnesium sulfide and magnesia aluminum spinel are generated by metallurgical technology, and ferrite and a small amount of pearlite with magnesia particles as nucleation conditions are obtained by TMCP rolling process and normalizing treatment body structure, thereby improving the welding performance of bridge steel.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/46C22C38/50C22C38/44C22C38/42C22C38/06C22C33/06C21D8/02C21D1/28C21C7/00C21C7/10
CPCC22C38/02C22C38/04C22C38/48C22C38/46C22C38/50C22C38/44C22C38/42C22C38/06C22C38/002C22C38/001C22C33/06C21D8/0205C21D8/0226C21D8/0247C21D1/28C21C7/0056C21C7/10C21D2211/005C21D2211/009Y02P10/20C22C38/60C22C38/54
Inventor 吴俊平
Owner NANJING IRON & STEEL CO LTD
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