Tundish covering agents

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Tundish covering agents

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Metallurgical Auxiliary Materials

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Tundish covering agents are divided into powder granule and hollow granule. Hollow granules feature good fluidity, better thermal insulation, and durability without crusting. See the following table for physical and chemical indexes and applicable steel varieties.

● Plain Tundish Covering Agent (PTF-1)

Chemistry Analysis	Alkalinity R	CaO%		SiO2 %	Al2O3%	Fe2O3%	MgO%	TC %
	0.8～2.5	20～40		18～45	5～10	<3	4～8	≤10
Physical Metrics	Test Density g/cm3		Melting point ℃		Moisture%	Particle shape		Applicable steel grades
	0.6～1.6		<1400		<0.8	Hollow granules or powder		Medium and high carbon steel

● High alkalinity low carbon low silicon tundish covering agent (DDF- 1)

Chemistry Analysis	Alkalinity R	CaO%		SiO2 %	Al2O3%	Fe2O3%	MgO%	TC %
	＞7	35～48		<6	33～40	<3	<10	<5.0
Physical Metrics	Test Density g/cm3		Melting point ℃		Moisture%	Particle shape		Applicable steel grades
	1.0～1.8		<1450		<0.8	＜2mm powder		Mild steel, ultra-low carbon steel Pipeline steel, etc.

● High alkalinity carbon-free low-silicon tundish covering agent (DDF- 2)

Chemistry Analysis	Alkalinity R	CaO%		SiO2 %	Al2O3%	Fe2O3%	MgO%	TC %
	＞7	40～48		<6	30～40	<3	<8	<1.0
Physical Metrics	Test Density g/cm3		Melting point ℃		Moisture%	Particle shape		Applicable steel grades
	1.0～1.8		<1450		<0.8	＜2mm powder		Mild steel, ultra-low carbon steel Pipeline steel, etc.