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V-containing steel for combined braking beam of railway freight car, and manufacturing method of V-containing steel

A technology for railway wagons and manufacturing methods, applied in the field of iron and steel metallurgy, capable of solving problems such as inconsistent performance

Active Publication Date: 2019-06-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although, when a certain amount of Widmanstatten structure is contained, the strength and mechanical properties can also meet the standard requirements, but it may cause the risk of unsuitable properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 Manufacture of Steel for Railway Freight Car Combined Brake Beam of the Present Invention

[0050] A steel plant adopts the technology of the present invention in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120 to 140 tons) to produce section steel for combined brake beams of railway wagons. The production process is: converter smelting → LF furnace electric heating →RH vacuum treatment→6-machine 6-strand billet continuous casting machine casting into 150mm×150mm steel billet→steel billet heating→rolling into section steel for combined brake beam of railway wagon. Specific process:

[0051] Firstly, 120 tons of molten iron and 20 tons of steel scrap are added into the converter, and the content of S is controlled to be no more than 0.060%, and the content of Nb is not more than 0.005%. After the molten iron and steel scrap are added to the converter, the molten iron and steel scrap are initially sme...

Embodiment 2

[0057] Embodiment 2 Manufacture of Steel for Railway Freight Car Combined Brake Beam of the Present Invention

[0058] A steel plant adopts the technology of the present invention in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120 to 140 tons) to produce section steel for combined brake beams of railway wagons. The production process is: converter smelting → LF furnace electric heating →RH vacuum treatment→6-machine 6-strand billet continuous casting machine casting into 200mm×200mm steel billet→steel billet heating→rolling into section steel for combined brake beam of railway wagon. Specific process:

[0059] First, add 134 tons of molten iron into the converter, the S content of the added molten iron is less than 0.060%, and the Nb content is not greater than 0.005%. After the molten iron is added to the converter, the molten iron is initially smelted into molten steel by using the function of the converter to remove...

Embodiment 3

[0065] Embodiment 3 Manufacture of Steel for Railway Freight Car Combined Brake Beam of the Present Invention

[0066] A steel plant adopts the technology of the present invention in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120 to 140 tons) to produce section steel for combined brake beams of railway wagons. The production process is: converter smelting → LF furnace electric heating →RH vacuum treatment→6-machine 6-strand billet continuous casting machine casting into 160mm×160mm steel billet→steel billet heating→rolling into section steel for combined brake beam of railway wagon. Specific process:

[0067] First, add 139 tons of molten iron into the converter, the S content of the added molten iron is less than 0.060%, and the Nb content is not greater than 0.005%. After the molten iron is added to the converter, the molten iron is initially smelted into molten steel by using the function of the converter to remove...

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Abstract

The invention relates to V-containing steel for a combined braking beam of a railway freight car and a manufacturing method of the V-containing steel, and belongs to the field of iron and steel metallurgy. The V-containing steel for the combined braking beam of the railway freight car is prepared from the chemical compositions in percentage by weight: 0.14%-0.18% of C, 0.25%-0.40% of Si, 1.35%-1.55% of Mn, 0.20%-0.30% of Cr, 0. 15%-0.18% of V, less than or equal to 0.005% of Nb, 0.0090%-0.0110% of N, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe andinevitable impurities. After the steel is normalized at 920 DEG C and tempered at 480 DEG C, the yielding strength of the steel is greater than or equal to 460 MPa, impact energy Akv (minus 40 DEG C)of the steel is greater than or equal to 27 J, the fatigue property of the steel is tested for one million times, and thus no crack is formed.

Description

technical field [0001] The invention relates to steel for combined brake beams of railway wagons containing V and a manufacturing method thereof, belonging to the field of iron and steel metallurgy. Background technique [0002] The combined brake beam of railway freight cars is a key component of the braking system of railway freight car bogies. Cutting and other complex alternating stresses, resulting in deformation or even fracture, reducing the safety and reliability of the braking system. Therefore, there are high requirements for its mechanical properties and fatigue properties, and the yield strength after heat treatment is required to be ≥ 460MPa. , Akv (-40 ℃) ≥ 27J, fatigue performance requires 1 million times without cracks. [0003] In the prior art, low-alloy high-strength steel Q460E is usually used to manufacture combined brake beams of railway wagons, but due to its high requirements on strength and toughness matching performance, it often results in inconsi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/24C22C38/26C21D8/00C22C33/06C21C7/10C21C7/06C21C7/00
CPCY02P10/20
Inventor 邓通武柯晓涛唐伟
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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