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A process method for producing mandrel by direct forging of continuous casting billet

A process method and technology of continuous casting slabs, which are applied in the field of seamless pipe rolling tools, can solve problems such as continuous porosity, shrinkage cavities and other defects that cannot be eliminated, and achieve elimination of carbides and segregation phenomena, uniform quality, and crystallization speed fast effect

Active Publication Date: 2022-07-22
天津天大高芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Defects such as continuous porosity and shrinkage cavities in the central part of the continuous casting slab cannot be eliminated by conventional forging methods

Method used

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  • A process method for producing mandrel by direct forging of continuous casting billet
  • A process method for producing mandrel by direct forging of continuous casting billet
  • A process method for producing mandrel by direct forging of continuous casting billet

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Effect test

Embodiment 1

[0053] A process method for producing mandrels by direct forging of continuous casting billets: using continuous casting billets with a diameter of 500 mm to produce a finished mandrel bar with a diameter of 182.7 mm and a length of 11.5 meters, and the weight is 2365 kilograms. Feeding 2650 kg, total material rate: 89%.

[0054] Step A: The annealed continuous casting billet is φ500 mm (steel type is H13 (4Cr5MoSiV1)), sawed and cut to a length of 1725 mm, and a circular A3 carbon plate with a thickness of 3 mm and a diameter of 375 mm is used for circumferential sealing and welding. The thickness of the surfacing layer is 3 mm. After the sealing and welding is completed, the stress relief treatment is carried out: the temperature is raised to 600 °C at 40 °C / hour, and the core is kept warm for 2 hours; the continuous casting billet after the sealing and welding stress relief treatment is placed in the heating furnace. It is heated to 1280°C inside, and the center reaches the...

Embodiment 2

[0062] A process method for producing mandrels by direct forging of continuous casting billets: using continuous casting billets with a diameter of 390 mm to produce a finished mandrel rod with a diameter of 182.7 mm and a length of 11.5 meters, and the weight is 2365 kilograms. Feeding 2650 kg, total material rate: 89%.

[0063] Step A: The annealed continuous casting billet is φ390 mm (steel type is H13 (4Cr5MoSiV1)), sawed and cut to a length of 2832 mm, and a circular A3 carbon plate with a thickness of 4 mm and a diameter of 293 mm is used for circumferential sealing and welding. The thickness of the surfacing layer is 4 mm, and the stress relief treatment is carried out after the sealing welding is completed: the temperature is raised to 600 °C at 60 °C / hour, and the core is kept warm for 2 hours; the continuous casting billet after the sealing welding stress relief treatment is placed in the heating furnace. It is heated to 1290°C inside, and the center reaches the set ...

Embodiment 3

[0071] A process method for producing mandrels by direct forging of continuous casting billets: using continuous casting billets with a diameter of 500 mm to produce a finished mandrel bar with a diameter of 272.6 mm and a length of 11.5 meters, and the weight is 5266 kilograms. Feeding 5908 kg, total material rate: 89%.

[0072] Step A: The annealed continuous casting billet is φ500 mm (steel type is H13 (4Cr5MoSiV1)), sawed and cut to a length of 3836 mm, and a circular A3 carbon plate with a thickness of 5 mm and a diameter of 375 mm is used, and the circumference is sealed and welded. The thickness of the surfacing layer is 5 mm, and the stress relief treatment is carried out after the sealing and welding is completed: the temperature is raised to 600 °C at 80 °C / hour, and the core is kept warm for 2 hours; the continuous casting billet after the sealing and welding stress relief treatment is placed in the heating furnace It is heated to 1300°C inside, and the center reach...

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Abstract

The invention discloses a process method for producing mandrels by direct forging of continuous casting billets, belonging to the field of seamless tube rolling tools; the technological method for producing mandrel rods by direct forging of continuous casting billets comprises the following steps: pre-processing the continuous casting billets, After that, the first high temperature homogenization is carried out; then the surface of the continuous casting slab is subjected to rapid cooling and radial preforging; then the second high temperature homogenization is carried out; then the continuous casting slab and then the surface are subjected to rapid cooling and Y-direction upsetting forging Chamfering and forging in YZ direction; then carry out the third high temperature homogenization; elongate and forge the continuous casting billet after the third high temperature homogenization; By organically combining the special treatment of the continuous casting billet, the third homogenization and the third forging, the invention creates dynamic conditions favorable for the diffusion of carbon and alloy elements, and completely eliminates defects such as continuous loose pores in the center of the continuous casting billet, Decomposes liquefied carbides and band-like structures due to dendrite segregation.

Description

technical field [0001] The invention relates to the field of seamless tube rolling tools, in particular to a process method for producing mandrels by direct forging of continuous casting billets. Background technique [0002] At present, the limiting or floating mandrel used for rolling seamless steel pipes is made of hot work die steel, which is mainly made of cast ingots or electroslag ingots through homogenization and forging. Due to its central continuity (penetration), looseness, shrinkage holes and other defects, the conventional heating→forging→grain refinement→annealing process cannot produce flawless mandrels. Compared with ingots and electroslag ingots, the advantages of small liquefied carbides in the continuous casting billet, relatively uniform structure, high yield and low cost have not been brought into play. Using the invention, the continuous casting billet is used as the raw material, and the special pretreatment of the sawing section of the continuous cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J5/08B21J5/02C21D8/06C21D1/32
CPCB21J5/002B21J5/08B21J5/022C21D8/065C21D1/32
Inventor 冯朝源王鹏吴国斌冯英育
Owner 天津天大高芯科技有限公司
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