Submerged Nozzle for Continuous Casting

Protect the molten steel from oxidation when it flows into the crystallizer from the tundish, evenly distribute the molten steel into the crystallizer, and control the flow state of the molten steel in the crystallizer, with good slag resistance, anti-blocking, long service life, and low accident rate.

Submerged nozzle physical and chemical indicators

Physical and chemical indicators：

Элемент	Индекс
	JSK55	JSK50	JSK45	JSK40
Al2O3  %	≥55	≥50	≥45	≥40
C %	≥16	≥18	≥20	≥22
Flexural Strength MPa	≥5.5	≥5.5	≥5.5	≥5
Apparent porosity %	≤19	≤19	≤19	≤19
Bulk density g/cm3	≥2.36	≥2.32	≥2.28	≥2.18

Slag Area：

Элемент	Индекс
	Z75	Z70	Z65	Z55
ZrO2  %	≥75	≥70	≥65	≥55
C %	≥9	≥12	≥15	≥18
Apparent porosity %	≤21	≤21	≤21	≤22
Bulk density g/cm3	≥3.6	≥3.5	≥3.4	≥3.2

What conditions does the submerged nozzle need to meet?

1) Ensure the flow rate of molten steel at normal pulling speed.
(2) Make the heat flow distribution in the mold and the cross section of the ingot as uniform as possible;
(3) Facilitate the rapid melting of protective slag;
(4) Facilitate the floating of inclusions without slag rolling;
(5) Avoid violent turbulence of the steel liquid level in the crystallizer;
(6) Easy to install.

Selection of immersed nozzle material

In the early stage of continuous casting, the fused quartz immersion nozzle with good thermal stability and high purity can meet the casting of ordinary carbon steel, low manganese steel, aluminum killed steel and other steel types. However, it is severely corroded under the conditions of high manganese steel and high alkalinity slag. At this time, the aluminum carbon immersion nozzle is widely used. The raw materials of aluminum carbon immersion nozzle are special grade bauxite, fused corundum or sintered corundum, etc., with the addition of graphite and antioxidants. The product has the advantages of corrosion resistance and thermal shock resistance.

Rongsheng компаниясымен таныстыру

Rongsheng компаниясы отқа төзімді материалдарды кәсіби жеткізуші болып табылады, бірге 10 жылдық экспорт тәжірибесі, астам экспорттауда 80 елдер. Rongsheng компаниясының негізгі өнімдері әртүрлі отқа төзімді кірпіштерді қамтиды, пішінсіз отқа төзімді материалдар, металлургиялық материалдар, жылу оқшаулағыш материалдар және т.б.