Railway track welded steel and manufacturing technology thereof

Abstract

The invention discloses a railway track welded steel and a manufacturing technology thereof and mainly comprises the contents of chemical ingredients of the railway track welded steel, matching proportions of raw materials and the manufacturing technology thereof; the railway track welded steel contains the chemical ingredients of: 0.05-0.13 of C; not more than 0.3 of Si; 4-7 of Mn; 16-20 of Cr; 10-13 of Ni; 0.9-2.0 of Mo; not more than 0.02 of P; not more than 0.01 of S; 0.1-0.3 of Ti; not more than 0.15 of Cu; and 57.09-68.95 of Fe. The manufacturing technology of the railway track welded steel comprises the procedures: determining the selection range of chemical ingredients-working out a matching proposal according to the range of chemical ingredients-medium frequency smelting-electroslag remelting (refining)-annealing-discharging-forging-hydrogen diffusion treatment-solid solution treatment-mechanical processing-inspection test; the key manufacturing technology comprises the steps: (1) electroslag remelting (refining), (2) forging, (3) hydrogen diffusion treatment, and (4) solid solution treatment; the railway track welded steel is reasonable in matching chemical ingredients, good in alloying effect, large in the change of forging ratio and excellent in tightness of microstructure, and completely adapts to the occasion of heavy track, heavy load and large variation of temperature difference. The railway track welded steel has high indexes of performance, and the index of welding performance guarantees the quality of welded joints and the traveling safety of trains. Various indexes of performance of the product reach or exceed those of domestic and oversea similar products.

Description

technical field

[0001] The invention belongs to the field of metallurgical manufacturing technology. Background technique

[0002] Railway track welding steel is used for welding between steel rails and high manganese steel frogs in railway tracks. This is because the materials of steel rails and high manganese steel are quite different. The former is carbon steel, and the latter is high carbon high manganese steel. , and the organizational state of the two is different, the former is in the rolling state, and the latter is in the casting state. Due to these reasons, there is a large difference in welding performance between the rail and the high manganese steel, and it can also be said that the two cannot be welded. However, the development of railway transportation requires high speed and heavy load, and it must be very safe and reliable. If there is a seam bolt between the rail and the high manganese steel, it will inevitably have adverse effects on the speed, load capac...

Examples

Embodiment ( 1

[0049] Welded with 60kg / M track, used at the lowest temperature -50°C (suitable for alpine regions)

[0050] 1. Selected chemical composition range: (%)C: 0.05-0.09; Si≤0.3; Mn: 4-5; Cr: 16-17; Ni: 12-13; Mo: 1.1-1.5; P≤0.02; S ≤0.01; Ti: 0.1-0.15Cu≤0.15 Fe: 62.79-65.85

[0051] 2. Formulate the ingredients according to the range of chemical composition: electrolytic manganese 5%, electrolytic chromium 16.8%, pure nickel plate 12.8%, pure molybdenum rod 1.4%, pure titanium 0.13%, industrial pure iron 63.87%.

[0052] The above-mentioned raw materials should be inspected, and their purity should not be lower than 99.9%.

[0053] 3. Intermediate frequency smelting: use alkaline furnace lining, bake before use, the baking temperature is 200-300 ℃, and the baking time is 6-8 hours. Except for electrolytic manganese, the remaining raw materials are put into the furnace. Put the electrolytic manganese into the furnace 30 minutes before coming out of the furnace. Sampling and ins...

Embodiment ( 2

[0079] Welded with 54kg / M track, the operating environment temperature is -10-40°C (suitable for hot and humid areas)

[0080] 1. Selected chemical composition range: (%)C: 0.08-0.12; Si≤0.3; Mn: 5-6; Cr: 17-18; Ni: 10-11; Mo: 0.9-1.2; P≤0.02; S≤0.01; Ti: 0.2-0.3; Cu≤0.15; Fe: 62.9-66.82

[0081] 2. Formulate the ingredient plan according to the chemical composition range: electrolytic manganese 6%, electrolytic chromium 18%, pure nickel plate 11%, pure molybdenum rod 1.2%, pure titanium 0.25%, industrial pure iron 63.55%; the above raw materials should be inspected, Its purity should not be lower than 99.9%.

[0082] 3. Intermediate frequency smelting: the same as application example 1.

[0083] 4. Electroslag remelting (refining): same as application example 1.

[0084] 5. Annealing: Same as application example 1.

[0085] 6. Blanking: Use a high-speed metal band saw, and the cutting weight is 39kg / piece.

[0086] 7. Forging: Same as application example 1.

[0087] 8. ...

technical field

[0001] The invention belongs to the field of metallurgical manufacturing technology. Background technique

[0002] Railway track welding steel is used for welding between steel rails and high manganese steel frogs in railway tracks. This is because the materials of steel rails and high manganese steel are quite different. The former is carbon steel, and the latter is high carbon high manganese steel. , and the organizational state of the two is different, the former is in the rolling state, and the latter is in the casting state. Due to these reasons, there is a large difference in welding performance between the rail and the high manganese steel, and it can also be said that the two cannot be welded. However, the development of railway transportation requires high speed and heavy load, and it must be very safe and reliable. If there is a seam bolt between the rail and the high manganese steel, it will inevitably have adverse effects on the speed, load capac...

Examples

Embodiment ( 1

[0049] Welded with 60kg / M track, used at the lowest temperature -50°C (suitable for alpine regions)

[0050] 1. Selected chemical composition range: (%)C: 0.05-0.09; Si≤0.3; Mn: 4-5; Cr: 16-17; Ni: 12-13; Mo: 1.1-1.5; P≤0.02; S ≤0.01; Ti: 0.1-0.15Cu≤0.15 Fe: 62.79-65.85

[0051] 2. Formulate the ingredients according to the range of chemical composition: electrolytic manganese 5%, electrolytic chromium 16.8%, pure nickel plate 12.8%, pure molybdenum rod 1.4%, pure titanium 0.13%, industrial pure iron 63.87%.

[0052] The above-mentioned raw materials should be inspected, and their purity should not be lower than 99.9%.

[0053] 3. Intermediate frequency smelting: use alkaline furnace lining, bake before use, the baking temperature is 200-300 ℃, and the baking time is 6-8 hours. Except for electrolytic manganese, the remaining raw materials are put into the furnace. Put the electrolytic manganese into the furnace 30 minutes before coming out of the furnace. Sampling and ins...

Embodiment ( 2

[0079] Welded with 54kg / M track, the operating environment temperature is -10-40°C (suitable for hot and humid areas)

[0080] 1. Selected chemical composition range: (%)C: 0.08-0.12; Si≤0.3; Mn: 5-6; Cr: 17-18; Ni: 10-11; Mo: 0.9-1.2; P≤0.02; S≤0.01; Ti: 0.2-0.3; Cu≤0.15; Fe: 62.9-66.82

[0081] 2. Formulate the ingredient plan according to the chemical composition range: electrolytic manganese 6%, electrolytic chromium 18%, pure nickel plate 11%, pure molybdenum rod 1.2%, pure titanium 0.25%, industrial pure iron 63.55%; the above raw materials should be inspected, Its purity should not be lower than 99.9%.

[0082] 3. Intermediate frequency smelting: the same as application example 1.

[0083] 4. Electroslag remelting (refining): same as application example 1.

[0084] 5. Annealing: Same as application example 1.

[0085] 6. Blanking: Use a high-speed metal band saw, and the cutting weight is 39kg / piece.

[0086] 7. Forging: Same as application example 1.

[0087] 8. ...

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