ESR 뜻 (Electro Slag Remelting)

Rendering of electro-slag remelting apparatus and cross-sections

ESR (Electro Slag Remelting)

원리는 용융슬래그의 전기저항열에 의하여 소모전극을 녹이고 슬래그 속을 적하침강한 용강을 수냉주형 내에서 연속적으로 응고시켜 가는 방법

 

특징

1. 진공배기장치가 없으므로 설비비가 적고 대기용해이므로 조업 용이.

2.강괴의표면이 깨끗하고 균질의 것을 얻을 수 있다.

3.불순원소나 비금속개재물을 효과적으로 저감할 수 있어 재질 향상.

4. 전극치수에 제한이 없고 강괴의 형상 크기도 자유롭다.

 

 

용융슬래그의 역할

1.전기적인 저항발열체이며 용해, 정련의 열공급원으로 작용한다.

2.용융금속을 덮어 외기와 주형으로부터 이것을 보호한다.

3.용융금속을 정제 또는 정화한다. 

 

 

Electroslag remelting (ESR), also known as electro-flux remelting, is a process of remelting and refining steel and other alloys for mission-critical applications in aircraft, thermal power stations, nuclear power plants, military technology and others.

The electroslag remelting (ESR) process is used to remelt and refine steels and various super-alloys, resulting in high-quality ingots. This process can be started up through vacuum induction melting. The ESR process uses the as-cast alloy as a consumable electrode. Electric current (generally AC) is passed between the electrode and the new ingot, which is formed in the bottom of a water-cooled copper mold. The new ingot is covered in an engineered slag that is superheated by the electric current. The electrode tip is slowly melted from contact with the slag. These metal droplets travel through the slag to the bottom of the water-cooled mold and slowly freeze as the ingot is directionally solidified upwards from the bottom of the mold. The slag pool floats above the refined alloy, continuously floating upwards as the alloy solidifies. The molten metal is cleaned of impurities that chemically react with the slag or otherwise float to the top of the molten pool as the molten droplets pass through the slag.

Electroslag remelting uses highly reactive slags (calcium fluoride, lime, alumina, or other oxides are usually the main components) to reduce the amount of type-A sulfide present in biometal alloys. It is a common practice in European industries. ESR reduces other types of inclusions as well, and is seen as an alternative to the vacuum arc remelting (VAR) method that is prevalent in US industries.

An example of the use of the electro-slag refined (ESR) steel technique is the L30 tank gun.

CrNi60WTi is a stainless steel which is best formed by either electro-slag remelting or vacuum arc remelting. This alloy can be used for the construction of nuclear power plants.

Electro-slag remelting - Wikipedia

Electro-slag remelting - Wikipedia

[금속제련기술사] 특수용해정련법인 ESR (Electro Slag Remelting) 법의 특징과 조업용으로 이용되는 용융슬래그의 역할에 대하여 설명하시오. (tistory.com)

[금속제련기술사] 특수용해정련법인 ESR (Electro Slag Remelting) 법의 특징과 조업용으로 이용되는 용