Ferrite-martensite dual-phase hot-rolled pickled plate for wheel spoke and preparation method thereof

Abstract

The invention belongs to the technical field of special steel plate preparation, and particularly provides a ferrite-martensitic double-phase hot-rolled pickling plate for wheel spokes and a preparation method thereof, the ferrite-martensitic double-phase hot-rolled pickling plate comprises the following components by weight: 0.05-0.07% of C, 0.40 to 0.60% of Si, 1.20% to 1.50% of Mn, less than orequal to 0.020% of P, less than or equal to 0.010% of S, 0.020%-0.070% of Alt, 0.30% to 0.40% of Cr, 0.10% to 0.20% of Mo, less than or equal to 0.006% of N and balance of Fe and unavoidable impurities. The ferrite-martensitic double-phase hot-rolled pickling plate adopts lower chromium and molybdenum contents, reduces the alloy cost, adopts a lower silicon content, reduces the difficulty of continuous casting production after steel making, improves the heat dissipation capacity and continuous casting ability of molten steel, and is beneficial to industrial mass production. By adopting of a two-stage cooling process, control variables are reduced, the operability and stability of the production are improved, and the coiling temperatureis appropriately increased to (350-400 DEG C). The higher the temperature, the lower the strength of the steel, and the loss of coiling equipment is reduced.

Description

technical field

[0001] The invention belongs to the technical field of preparation of special steel plates, and particularly provides a ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes and a preparation method thereof. Background technique

[0002] Due to the ferrite-martensitic dual-phase steel has a large amount of ferrite with very little carbon content, it has a high elongation, and at the same time, the hard phase martensite is distributed in the ferrite crystals in an island shape. At the boundary, it not only plays the role of strengthening the matrix, but also increases the contact area of ​​the grain boundary, and also has the effect of strengthening the grain boundary, so that the dual-phase steel with this structure has the advantage of better matching of strength and plasticity.

[0003] Due to the complex forming of the wheel spoke, the material is required to have a low yield strength to achieve easy forming, and a high tensile strength ...

Examples

Embodiment 1

[0011] In this example, the composition of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling sheet alloy for the wheel spokes is: C: 0.06%, Si: 0.50%, Mn: 1.20%, P: 0.010%, S: 0.005%, Alt (full aluminum): 0.025%, Cr: 0.33%, Mo: 0.12%, N: 0.0040%, and the balance is iron and unavoidable impurities.

[0012] In this embodiment, the production method of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is as follows:

[0013] 1) Smelt the 580MPa grade ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes according to the conventional method, and cast it into a slab;

[0014] 2) Heat the cast billet in a walking heating furnace, and keep it at 1250°C for 60 minutes to make a large amount of solid solution; after the cast billet comes out of the furnace, it is descaled with high-pressure water, and then enters the rough rolling mill for rolling, and the rolling temperature is 1120°C; After rough rolli...

Embodiment 2

[0016] In this example, the composition of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling sheet alloy for the wheel spokes is: C: 0.07%, Si: 0.51%, Mn: 1.22%, P: 0.012%, S: 0.004%, Alt (full aluminum): 0.030%, Cr: 0.35%, Mo: 0.13%, N: 0.0045%, and the balance is iron and unavoidable impurities.

[0017] In this embodiment, the production method of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is as follows:

[0018] 1) Smelt the 580MPa grade ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes according to the conventional method, and cast it into a slab;

[0019] 2) Heat the casting billet in a walking heating furnace, and keep it at 1253°C for 60 minutes to make a large amount of alloy into solid solution; after the billet comes out of the furnace, it is descaled with high-pressure water, and then enters the rough rolling mill for rolling, and the rolling temperature is 1120°C; After ro...

Embodiment 3

[0021] In this example, the alloy composition of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is: C: 0.05%, Si: 0.55%, Mn: 1.25%, P: 0.013%, S: 0.006%, Alt (full aluminum): 0.028%, Cr: 0.32%, Mo: 0.13%, N: 0.0050%, and the balance is iron and unavoidable impurities.

[0022] In this embodiment, the production method of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is as follows:

[0023] 1) Smelt the 580MPa grade ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes according to the conventional method, and cast it into a slab;

[0024] 2) Heat the cast billet in a walking heating furnace, and keep it at 1256°C for 60 minutes to make a large amount of solid solution; after the cast billet comes out of the furnace, perform high-pressure water descaling, and then enter the rough rolling mill for rolling, and the rolling temperature is 1130°C; After rough rolling, ...

technical field

[0001] The invention belongs to the technical field of preparation of special steel plates, and particularly provides a ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes and a preparation method thereof. Background technique

[0002] Due to the ferrite-martensitic dual-phase steel has a large amount of ferrite with very little carbon content, it has a high elongation, and at the same time, the hard phase martensite is distributed in the ferrite crystals in an island shape. At the boundary, it not only plays the role of strengthening the matrix, but also increases the contact area of ​​the grain boundary, and also has the effect of strengthening the grain boundary, so that the dual-phase steel with this structure has the advantage of better matching of strength and plasticity.

[0003] Due to the complex forming of the wheel spoke, the material is required to have a low yield strength to achieve easy forming, and a high tensile strength ...

Examples

Embodiment 1

[0011] In this example, the composition of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling sheet alloy for the wheel spokes is: C: 0.06%, Si: 0.50%, Mn: 1.20%, P: 0.010%, S: 0.005%, Alt (full aluminum): 0.025%, Cr: 0.33%, Mo: 0.12%, N: 0.0040%, and the balance is iron and unavoidable impurities.

[0012] In this embodiment, the production method of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is as follows:

[0013] 1) Smelt the 580MPa grade ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes according to the conventional method, and cast it into a slab;

[0014] 2) Heat the cast billet in a walking heating furnace, and keep it at 1250°C for 60 minutes to make a large amount of solid solution; after the cast billet comes out of the furnace, it is descaled with high-pressure water, and then enters the rough rolling mill for rolling, and the rolling temperature is 1120°C; After rough rolli...

Embodiment 2

[0016] In this example, the composition of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling sheet alloy for the wheel spokes is: C: 0.07%, Si: 0.51%, Mn: 1.22%, P: 0.012%, S: 0.004%, Alt (full aluminum): 0.030%, Cr: 0.35%, Mo: 0.13%, N: 0.0045%, and the balance is iron and unavoidable impurities.

[0017] In this embodiment, the production method of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is as follows:

[0018] 1) Smelt the 580MPa grade ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes according to the conventional method, and cast it into a slab;

[0019] 2) Heat the casting billet in a walking heating furnace, and keep it at 1253°C for 60 minutes to make a large amount of alloy into solid solution; after the billet comes out of the furnace, it is descaled with high-pressure water, and then enters the rough rolling mill for rolling, and the rolling temperature is 1120°C; After ro...

Embodiment 3

[0021] In this example, the alloy composition of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is: C: 0.05%, Si: 0.55%, Mn: 1.25%, P: 0.013%, S: 0.006%, Alt (full aluminum): 0.028%, Cr: 0.32%, Mo: 0.13%, N: 0.0050%, and the balance is iron and unavoidable impurities.

[0022] In this embodiment, the production method of the 580MPa grade ferrite-martensitic dual-phase hot-rolled pickling plate for the wheel spoke is as follows:

[0023] 1) Smelt the 580MPa grade ferrite-martensite dual-phase hot-rolled pickling plate for wheel spokes according to the conventional method, and cast it into a slab;

[0024] 2) Heat the cast billet in a walking heating furnace, and keep it at 1256°C for 60 minutes to make a large amount of solid solution; after the cast billet comes out of the furnace, perform high-pressure water descaling, and then enter the rough rolling mill for rolling, and the rolling temperature is 1130°C; After rough rolling, ...