Unlock instant, AI-driven research and patent intelligence for your innovation.

Machining technology of nickel-based alloy N08120 ring piece without island structure

A nickel-based alloy and processing technology, applied in the field of nickel-based alloys, can solve the problems that the performance of ring products cannot meet the standard requirements, and achieve the effects of excellent flaw detection quality, uniform austenite grain structure, and improved yield.

Active Publication Date: 2020-12-01
DAYE SPECIAL STEEL CO LTD
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the ring products processed by nickel-based alloy N08120 often have island structures in the prior art, which leads to the technical problem that the performance of the ring products cannot meet the standard requirements, and propose a nickel-based alloy without island structure. Processing Technology of Alloy N08120 Ring

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Machining technology of nickel-based alloy N08120 ring piece without island structure
  • Machining technology of nickel-based alloy N08120 ring piece without island structure
  • Machining technology of nickel-based alloy N08120 ring piece without island structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Raw material: Φ710mm electroslag steel ingot, wherein, the mass percentage of each element in the steel ingot is: C: 0.056; Cr: 25.05; Ni: 37.03; Nb: 0.66; N: 0.23; the rest is Fe and unavoidable rolling elements;

[0046] Embodiment 1 of the present invention utilizes Φ710mm electroslag steel ingot to produce N08120 rings, and the specifications of the required ring products are Φ3200mm*Φ2800mm*200mm (outer diameter*inner diameter*height), and the specific processing technology includes the following steps:

[0047] Step 1: Electroslag steel ingot charging: Put the Φ710mm electroslag steel ingot into the heating furnace by heating up with the furnace;

[0048] Step 2: The heating of the steel ingot is divided into three sections: preheating section, soaking section and holding section. The temperature in the preheating section is 700°C, and the holding time is 1 hour; the temperature in the soaking section is 1000°C, and the holding time is 2 hours; The temperature of ...

Embodiment 2

[0062] Raw material: Φ880mm electroslag steel ingot, wherein, the mass percentage of each element composition of the steel ingot is: C: 0.060; Cr: 25.07; Ni: 37.05; Nb: 0.63; N: 0.22; the rest is Fe and unavoidable impurity elements;

[0063] Embodiment 2 of the present invention utilizes the manufacturing method of Φ880mm electroslag steel ingot to produce N08120 ring, the specification of the required finished product is Φ3230mm*Φ1820mm*220mm, and the specific processing technology includes the following steps:

[0064] Step 1: Furnace loading of steel ingots: Put the Φ880mm electroslag steel ingots into the heating furnace to heat the steel ingots by means of heating up with the furnace;

[0065] Step 2: The heating of the steel ingot is divided into three sections: preheating section, soaking section and holding section. The temperature in the preheating section is 690°C, and the holding time is 1.5 hours; the temperature in the soaking section is 1010°C, and the holding ti...

Embodiment 3

[0078] The preparation of embodiment 3 rings except that the intermediate pretreatment temperature of step (5) and (8) is slightly different with embodiment 1, all the other are identical with embodiment 1, in embodiment 3, step (5) and (8 ) The intermediate pretreatment temperature is 1190℃, and its metallographic photos are as follows Figure 4 As shown, it can be seen that after two intermediate pretreatments at 1190 ° C for 4 hours, the grain structure has completely recovered to crystallization, and it is a uniform austenite equiaxed grain, and there is no unrecovered recrystallized tension. Long grain and "island grain" organization.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a machining technology of a nickel-based alloy N08120 ring piece without an island structure. The machining technology comprises the following steps of using an electroslag steel ingot as a raw material, obtaining an annular blank through cogging operation, circularly carrying out the following treatment process on the obtained blank for more than two times, specifically, the treatment process comprises the step of sequentially carrying out intermediate pretreatment, blank heating and rolling working procedures. The deformation ratio of cogging operation is larger than or equal to 6. The specific operation of the intermediate pretreatment working procedure comprises the steps of heating the blank to enable the temperature to be 1180 DEG C to 1200 DEG C, keeping the temperature for 4-8 hours, and then cooling the blank to enable the temperature to be equal to the room temperature. The blank subjected to intermediate pretreatment is heated and then rolled, and after all the treatment processes are accomplished, the total deformation ratio of all the rolling working procedures is larger than or equal to 5. According to the machining technology, due to the fact that the hot working deformation and the intermediate pretreatment technology are optimized, abnormal island grain structures can be eliminated, and uniform austenite grain structures and the excellent flaw detection quality are obtained.

Description

technical field [0001] The invention belongs to the field of nickel-based alloys, in particular to nickel-based alloy N08120, in particular to a processing technology for a nickel-based alloy N08120 ring without an island structure. Background technique [0002] Nickel-based alloy N08120 is an alloy material commonly used in power plants, and is mostly used to manufacture ring products. Affected by the characteristics of the alloy, an abnormal grain structure often appears in the finished ring, which is manifested as: one or more isolated independent small austenite grains appear inside the large austenite grains. The grain boundaries of grains are not connected to each other, and the present invention names such isolated independent small austenite grains as island structure. The existing manufacturing method uses electroslag steel ingots as raw materials, and proceeds in sequence as follows: ingot heating → forging billet: billet deformation ratio is about 3 → finishing →...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 杨晓利王立雷应华贾余超张志成曹政陈君高首磊张晓磊郑振宇章东海王石军
Owner DAYE SPECIAL STEEL CO LTD