Liaogang brand (labeled LG) ductile iron for casting has a high reputation in the industry and has won the favor of many users due to its unique advantages of "constant silicon, low titanium, low phosphorus, low manganese, low sulfur, low arsenic, low chromium, and low vanadium".
At present, domestic high-end casting products have increasingly strict requirements for harmful components such as titanium, phosphorus, manganese, and vanadium in pig iron. However, in the smelting process, the technology for removing titanium, phosphorus, and vanadium is not yet mature. The key to reducing the titanium, phosphorus, and vanadium content in ductile iron lies in selecting high-quality iron concentrate powder, optimizing the ingredients, and smelting. LG brand ductile iron uses high-quality iron ore from local and adjacent counties as the main raw material, using ultra-low furnace temperature smelting, constant silicon addition outside the furnace, and other technologies to ensure that the titanium, phosphorus, and vanadium content in the iron ball is effectively controlled within 0.03, the manganese content is within 0.1, and the arsenic content is within 0.0005, The chromium content should be within 0.05, and the vanadium content should be controlled within 0.01.

Product Series	Mark	Composition standards（%）
		Si	Ti	Mn	P	S	C
Ductile castiron	特Q6	0.5-0.60	≤0.030	≤0.150	≤0.035	≤0.020	≥3.40
	特Q7	0.61-0.70	≤0.035	≤0.150	≤0.035	≤0.020
	特Q8	0.71-0.80	≤0.035	≤0.150	≤0.035	≤0.020
	特Q9	0.81-0.90	≤0.038	≤0.150	≤0.035	≤0.020
	特Q10	0.91-1.00	≤0.040	≤0.150	≤0.035	≤0.020
	一级Q6	0.50-0.60	≤0.040	0.15-0.20	≤0.040	≤0.020	≥3.4
	一级Q7	0.61-0.70	≤0.040	0.15-0.20	≤0.040	≤0.020
	一级Q8	0.71-0.80	≤0.040	0.15-0.20	≤0.040	≤0.020
	一级Q9	0.81-0.90	≤0.040	0.15-0.20	≤0.040	≤0.020
	一级Q10	0.91-1.00	≤0.040	0.15-0.20	≤0.040	≤0.020
	特Q12	1.01-1.2	≤0.050		≤0.040	≤0.020	≥3.4
	特Q14	1.21-1.40	≤0.050		≤0.040	≤0.020	≥3.4
	特Q16	1.41-1.60	≤0.050		≤0.040	≤0.020
	特Q18	1.61-1.8	≤0.055		≤0.040	≤0.020
	二级Q6	0.50-0.60	≤0.050		≤0.040	≤0.030	≥3.40
	二级Q7	0.61-0.70	≤0.050		≤0.040	≤0.030
	二级Q8	0.71-0.80	≤0.050		≤0.040	≤0.030
	二级Q9	0.81-0.90	≤0.050		≤0.040	≤0.030
	二级Q10	0.91-1.00	≤0.050		≤0.040	≤0.030
	二级Q12	1.01-1.20	≤0.050		≤0.040	≤0.030
	二级Q14	1.21-1.40	≤0.050		≤0.040	≤0.030