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Induction heating method for extruded nickel-based alloy bar

A bar induction, nickel-based alloy technology, applied in the field of nickel-based alloy thermal deformation, can solve the problems of unevenness, temperature fluctuation of billet induction heating, etc., achieve uniform structure, fine and uniform rod structure, and eliminate surface cracks.

Active Publication Date: 2017-03-22
太原钢铁(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the shortcomings of the existing nickel-based alloy extruded rod induction heating method, and provides a nickel-based alloy extruded rod induction heating method, which overcomes the phenomenon that the billet induction heating temperature fluctuates greatly and is seriously uneven. The end result is high quality extruded rods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the Inconel625 forging blank is obtained by adopting the VIM+ESR radial forging process, and the surface of the forging blank is machined, and the final specification of the blank is φ222×680mm.

[0025] The weight percent of chemical composition is:

[0026] C 0.02%, Cr 22%, Ni 64.35%, Mo 9%, Al 0.4%, Nb 4.0%, Ti 0.2%,

[0027] The rest are unavoidable impurities.

[0028] This embodiment includes the following steps in sequence:

[0029] Ⅰ The billet enters the roller hearth furnace at room temperature (the roller hearth furnace is a circular continuous heating device, it is at room temperature when entering the furnace, and then the billet rolls in the furnace, which is a gradual heating process), the time in the furnace is 157min, and the temperature of the roller hearth furnace is 920 ℃.

[0030] Ⅱ The billet from the roller hearth furnace is sent to the induction heating furnace by the roller table, the billet diameter is required to be φ222...

Embodiment 2

[0037] In this embodiment, the C-276 forging blank is obtained by using the VIM+ESR+diameter forging process, and the surface of the forging blank is machined, and the final blank specification is φ258×770mm.

[0038] The weight percent of chemical composition is:

[0039] C 0.01%, Cr 16%, Ni 58.96%, Mo 16%, Fe 5%, W 4%,

[0040] The rest are unavoidable impurities.

[0041] This embodiment includes the following steps in sequence:

[0042] Ⅰ The billet enters the roller hearth furnace at room temperature, stays in the furnace for 165 minutes, and exits the roller hearth furnace at a temperature of 940°C.

[0043] Ⅱ The billet from the roller hearth furnace is sent to the induction heating furnace by the roller table, the billet diameter is required to be φ258mm, the length is 770mm, and the length of the induction furnace coil is 1000mm;

[0044] Ⅲ Adopt two-stage control induction heating + control heat preservation technology to solve the phenomenon of inaccurate control...

Embodiment 3

[0049] In this embodiment, the Inconel718 forging blank is obtained by VIM+ESR+diameter forging process, and the surface of the forging blank is machined, and the final blank specification is φ218×790mm.

[0050] The weight percent of chemical composition is:

[0051] C 0.06%, Cr 19%, Ni 50.97%, Mo 3.0%, Al 0.4%, Ti 1.0%, Nb 5.0%,

[0052] Fe 20.54%, the rest are unavoidable impurities.

[0053] This embodiment includes the following steps in sequence:

[0054] Ⅰ Billets enter the roller hearth furnace at room temperature, stay in the furnace for 180 minutes, and exit the roller hearth furnace at a temperature of 900°C.

[0055]Ⅱ The billet from the roller hearth furnace is sent to the induction heating furnace by the roller table, the billet diameter is required to be φ218mm, the length is 790mm, and the length of the induction furnace coil is 1000mm;

[0056] Ⅲ Adopt two-stage control induction heating + control heat preservation technology to solve the phenomenon of inac...

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Abstract

The invention relates to a nickel base alloy extruded bar induction heating method. The nickel base alloy extruded bar induction heating method comprises the following steps: (I) a roller bottom furnace is used for heating; the time is not shorter than 150 min; and the furnace discharge temperature is within 900-950 DEG C; (II) a blank is fed to an induction heating furnace; the diameter of the blank is not larger than 260 mm; and the length is not larger than 90% of the length of a heating coil of the induction furnace; and (III) the induction heating is controlled by two phases: the first phase: the heating power (KW)=the blank diameter (mm)*K1 (KW / mm); the power adjusting coefficient K1=1.1-1.2; the heating time (s)=1 / 2 blank diameter (mm)*M (s / mm); the time adjusting coefficient M=1.4-1.6; and the second phase: the blank is directly heated to the target temperature through induction heating; the heating power (KW)=the blank diameter (mm)*K2 (KW / mm); the power adjusting coefficient K2=2.0-2.2; the target temperature is kept; the insulation power is 15-30 KW; and the insulation time is 30-45 s. The method overcomes the phenomenon of seriously nonuniform blank induction heating temperature; the straightness is not greater than 0.02 m per meter; and no cracking phenomenon is generated.

Description

technical field [0001] The invention belongs to the technical field of thermal deformation of nickel-based alloys, and in particular relates to an induction heating method for extrusion rods of nickel-based alloys. Background technique [0002] Nickel-based alloys have excellent corrosion resistance, oxidation resistance and good mechanical properties. They are widely used in aviation, aerospace, energy and petrochemical fields. According to their product use forms, they are mainly divided into plates, tubes, rods and wires. Nickel-based alloy rods are mainly used as raw materials for products such as rotating shafts, fasteners, and load-bearing parts. The internal structure requirements are relatively strict. The rods are mainly produced by forging and extrusion. For hot extruded rods, because of their outstanding surface quality, fine and uniform internal structure, high yield and other significant advantages, they are used as raw materials for processing higher-grade prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C29/00
Inventor 王岩徐芳泓李阳曾莉方旭东
Owner 太原钢铁(集团)有限公司
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