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Forging method for large-size Inconel690 alloy bar

An alloy bar, large-scale technology, applied in the field of metal pressure processing, can solve the problems of uneven forged structure, high forging deformation resistance, production difficulties, etc., to achieve large deformation temperature range, small alloy deformation resistance, and fast diffusion speed Effect

Active Publication Date: 2016-05-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its outstanding comprehensive performance, I-690 alloy is widely used in the industry. However, due to the large size of the original steel ingot blank and the high resistance to forging deformation, the production of large-scale I-690 bars has certain difficulties, and cracking of the blank is prone to occur during production. , Uneven forged structure, etc.

Method used

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  • Forging method for large-size Inconel690 alloy bar
  • Forging method for large-size Inconel690 alloy bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Forging of Inconel 690 Alloy Φ215mm Diameter Bar

[0021] Equipment: Φ215mm diameter rod forging equipment uses 6T forging hammer.

[0022] Raw materials: The forging raw materials are forged with Φ515mm diameter electroslag remelted ingots.

[0023] Heating: Before forging, the steel ingot is heated in a gas furnace at 300°C. The heating rate is 100°C / h per hour. After reaching 950°C for 3 hours, continue to heat up to 1200°C, and hold for 5 hours to start forging.

[0024] Billet opening: The billet opening of the steel ingot adopts the elongation process. The electroslag ingot is forged from Φ515mm in diameter to a 400×400mm square bar. The forging temperature is 970°C. After forging, return to the furnace and heat for 1.5 hours.

[0025] Intermediate deformation: The intermediate deformation is divided into two steps. The first step is to forge the billet from 400×400mm into a 340×340mm square bar, apply external force to deform it along the diagonal direction o...

Embodiment 2

[0031] Forging of Inconel 690 Alloy Φ215mm Diameter Bar

[0032] Equipment: Φ215mm diameter rod forging equipment uses 6T forging hammer.

[0033] Raw materials: The forging raw materials are forged with Φ515mm diameter electroslag remelted ingots.

[0034] Heating: Before forging, the steel ingot is heated in a gas furnace at 500°C. The heating rate is 100°C / h per hour. After reaching 930°C for 3 hours, continue to heat up to 1200°C, and hold for 5.5 hours to start forging.

[0035] Billet opening: The billet opening of the steel ingot adopts the elongation process. The electroslag ingot is forged from Φ515mm in diameter to a 400×400mm square bar. The forging temperature is 960°C. After forging, return to the furnace and heat for 2 hours.

[0036] Intermediate deformation: The intermediate deformation is divided into two steps. The first step is to forge the billet from 400×400mm into a 340×340mm square bar, apply external force to deform it along the diagonal direction o...

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Abstract

The invention discloses a forging method for a large-size Inconel690 alloy bar and belongs to the field of metal pressure processing. The forging method comprises the steps that an electroslag remelting steel ingot is selected as the raw material for forging the alloy bar, the forging heating temperature is 1200 DEG C+ / -10 DEG C, and the intra-furnace heating and heat-preserving time before forging is worked out according to the size of the steel ingot; the cogging drawing deformation of the steel ingot is controlled in the range of 20%-30%, the feeding quantity L is controlled in the range of 0.5-0.8 h, the finish forging temperature is 950 DEG C or higher, and the steel ingot is forged to be a bar with a square cross section through cogging; and after cogging is completed, the bar is put back to a furnace to be subjected to heating and heat preserving, intermediate deformation is conducted, specifically, external force is applied in the direction of the diagonal line of the cross section of the blank to achieve deformation, the deformation is controlled in the range of 20%-50%, the feeding quantity L is controlled in the range of 0.5-0.8 h, and the finish forging temperature is higher than 900 DEG C; the terminal end fire deformation is controlled to be 35% or above, and the finish forging temperature is higher than 800 DEG C. The I-690 alloy bar forged through the forging method is high in structure uniformity, few in deformation pass and capable of effectively reducing the production cost.

Description

technical field [0001] The invention belongs to the field of metal pressure processing, and relates to the improvement of a large-scale Inconel690 (hereinafter referred to as I-690) alloy forging process, in particular to a forging method of a large-scale Inconel690 alloy rod. Background technique [0002] As a nickel-based alloy with high chromium and low carbon content, Inconel690 alloy has excellent corrosion resistance and can serve stably for a long time in harsh corrosive environments. Due to its outstanding comprehensive performance, I-690 alloy is used in a huge amount in the industry. However, due to the large size of the original steel ingot billet and the high forging deformation resistance, the production of large-scale I-690 bars is difficult, and cracking of the billet is prone to occur during production. , Uneven forged structure and other issues. To solve the above problems, it is necessary to improve the process parameters such as deformation temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04B21J1/04B21J1/06
Inventor 张龙高明马颖澈刘奎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI