Castings
Unalloyed carbonic
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 | GE 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 | 690 – 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.
