Unalloyed carbonic castings

Conversion table of produced steels. We prefer to supply final product according to Chomutov marking. On special customer´s request is possible to supply castings according to other standard.

Marking of Chomutov	EU EN	WNr.	DE marked by DIN	FRA AFNOR	UK BSI	ITA UNI
ČSN 42 2640	GE 240	1.0446	GS-45	230-400M	161 Gr.430 A	FeG 450
ČSN 42 2643	GS 240	1.0455	GS-C25	A 420 AP M	161 Gr.430 E	FeG 42
ČSN 42 2650	GE 240	1.0552	GS-52	320-560 M	161 Gr.480 A	FeG 520
ČSN 42 2660	GE 300	1.0558	GS-60	30 M 6 M	A 3/A 5/AW 2	FeG 570
ČSN 42 2670	-	1.0554	GS-70	370-650 M	AW 3	-
GS-45	GE 240	1.0446	GS-45	230-400M	161 Gr.430 A	FeG 450
GS-52	-	1.0552	GS-52	320-560 M	161 Gr.480 A	FeG 520
GS-60	GE 300	1.0558	GS-60	30 M 6 M	A 3/A 5/AW 2	FeG 570

Some types of castings are also roughted or machined according to our possibilities.

ČSN 42 2640 (Structural steel)

Chemical composition in percents

C	Mn	Si	P	S	P+S
0.20	0.40	0.20	max.	max.	max.
0.28	0.80	0.50	0.05	0.05	0.09

Castings are delivered as normalized (+N) or normalized and tempered (+NT).

Mechanical properties and values

Tensile strength	Rm	N/mm2	440 - 590
Yield point Rp 0.2	Re	N/mm2	>= 240
Elongation	A	%	>= 22
Contraction	Z	%	>= 30
Notch impact toughness KCU3	KC	J/cm2	>= 50
Hardness	-	HB	125 - 170

• Weld ability
  Guaranteed, under specific conditions (preheat to 200°C). After welding, it is recommended to anneal at 600 - 650°C for the stress relieving.
• Machinability
  Very good.
• Application
  All purpose applications without any special requirements. It is suitable for medium stressed parts and construction elements. The steel cannot be heat-treated.

ČSN 42 2650 (Structual steel)

Chemical composition in percents

C	Mn	Si	P	S	P+S
0.28	0.40	0.20	max.	max.	max.
0.38	0.80	0.50	0.05	0.05	0.09

Castings are delivered as normalized (+N) or normalized and tempered (+NT).

Mechanical properties and values

Tensile strength	Rm	N/mm2	500 - 650
Yield point Rp 0.2	Re	N/mm2	>= 260
Elongation	A	%	>= 20
Contraction	Z	%	>= 25
Notch impact toughness KCU3	KC	J/cm2	>= 40
Hardness	-	HB	145 - 185

• Weld ability
  Good under specific conditions - preheating to 250°C. After welding, it is recommended to anneal at 600 - 650°C for the stress relieving.
• Machinability
  Very good.
• Application
  General applications for castings of parts under stress where hardening treatment is not necessary. Suitable for application in electrically powered machines.

ČSN 42 2670 (Structual steel)

Chemical composition in percents

C	Mn	Si	P	S	P+S
0.50	0.40	0.20	max.	max.	max.
0.60	0.80	0.50	0.05	0.05	0.09

Casting are delivered as normalized (+N) or normalized and tempered (+NT).

Mechanical properties and values

Tensile strength	Rm	N/mm2	600 - 840
Yield point Rp 0.2	Re	N/mm2	>= 380
Elongation	A	%	>= 10
Hardness	-	HB	200 - 240

• Weldability
  Good under specific conditions - preheating to 350°C. After welding, the casting must be annealed at 600-650°C for the stress relieving or normalized and tempered anew.
• Machinability
  Good, at reduced cutting speed.
• Application
  For selected applications as cast parts with increased strength, hardness and toughness of construction where a high amount of A, Z and KC are not simultaneously required. The steel is not intended for hardening treatment.