Materials and melting units

Liquid metal is produced in an accurate way: in modern rotary drum furnaces
Smelting furnaces:
- SOGEMI 12 t rotary drum furnace
  - output 12 t of LM/batch
- HTT 5 t rotary drum furnace
  - output 5 t LM/batch

Metallurgy equipment for production of spheroidal graphite cast irons:
- PROGELTA metallurgy station
  - modification – filled profile
  - inoculation – filled profile
  - max. processed volume of LM - 5 t-6 t

Natural gas and oxygen burner and control system from AIR PRODUCTS
Ductile iron (SGI) is produced using a filled profile metallurgy station with suction and two feeders for modification and inoculation profiles (Progelta It.).
All batch materials used have a certified quality.
The composition of liquid metal is monitored as follows in order to meet all applicable standards:
- by Tasman Q4 spark emission spectrometer integrated with the OPTI foundry management system
- by turbidity tests in order to verify inoculation results
- by metallographic polishing (subcontracted)
- by thermal analysis for interpretation of metal cooling curve (subcontracted)

LGI – grey iron

cast iron references in individual standards				tensile strength Rm [MPa]	hardness HB max
ČSN EN 1561	ČSN	DIN 1691	ASTM A48	tensile strength Rm [MPa]	hardness HB max
EN-GJL-150	42 2415	GG-15	Class 25	150	200
EN-GJL-200	42 2420	GG-20	Class 30	200	220
EN-GJL-250	42 2425	GG-25	Class 35	250	240
EN-GJL-300	42 2430	GG-30	Class 40	300	260
EN-GJL-350	42 2435	GG-35	Class 45	350	270

Maximum grey iron casting weight – 15 000 kg.

SGI – ductile iron

cast iron references in individual standards				tensile strength Rm [MPa]	ductility A5min [%]	hardness HB max
ČSN EN 1561	ČSN	DIN 1691	ASTM A48	tensile strength Rm [MPa]	ductility A5min [%]	hardness HB max
EN-GJS-400-15	42 2304	GGG-40	Gr. 65-45-12	400	12	130-175
EN-GJS-500-7	42 2305	GGG-50	Gr. 70-50-05	500	7	170-230
EN-GJS-600-3	42 2306	GGG-60	Gr. 80-60-03	600	3	190-270
EN-GJS-700-2	42 2307	GGG-70	Gr. 100-70-03	700	2	225-305