| 250A53 (En45) | | | | | Chemical Composition | | |
|---|
| ROUND BAR AND FLAT BAR | | Minimum % | Maximum % |
| | | | | | Carbon | 0,50 | 0,57 |
| | | | | | Silicon | 1,70 | 2,10 |
| | | | BS 970 | 250 A 53 | Manganese | 0,70 | 1,00 |
| | | | SAE (AISI) | 9255 | Sulphur | 0,00 | 0,05 |
| | | | WERKSTOFF NO | 1,5026 | Phosphorus | 0,00 | 0,05 |
| HEAT TREATED CONDITION | | | | | | | |
| Tensile Strength, Mpa minimum | | | | | | | 0 |
| Elongation, percent minimum | | | | | | | 0 |
| Izod Impact Value, Joule | | | | | | | 0 |
| Brinell Hardness Number | | | | | | | 0 |
TYPICAL USES :
Automotive leaf springs and agriculture
STD STOCK SIZES (as rolled)
| Flat Bar | 44.5 x 6 to 100 x 25 | Round Bar | 10m to 38mm Dia |
|---|
General Heat Treatment information on Steel Grades 250A53
Chemical
In an oil hardening steel generally used for manufacture of springs (flat leaf springs, coil springs, etc.) and sometimes for torsion bars.
Machinability is good (in the softened conditions)
| Hot forming/ forging/ rolling/ pressing | Heat to 1150° (not above 1200°) and finish above 860° C. |
| Normalising | 870°C - 930°C, cooling in still air. |
| Annealing | 840°C - 900°C, cooling in furnace |
| Spheroidising | 680°C - 930°C, cooling in furnace |
| Hardening | 880°C - 930°C, quenching in oil. The components should be removed from the quenching medium when their temperature in roughly 50°C. |
| Tempering | Depending on hardness required can vary between 400°C and 550°C (see graph attached) the product should be tempered as soon as possible after hardening (quenching) but is in most cases not as susceptible to quench cracking as most other spring steel grades |
| SAE 5160 | | | | | Chemical Composition | | |
|---|
| ROUND BAR AND FLAT BAR | | | | | | Minimum % | Maximum % |
| | | | | | Carbon | 0,56 | 0,64 |
| | | | | | Silicon | 0,15 | 0,35 |
| | | | BS 970 | 525 A 60 | Manganese | 0,75 | 1,00 |
| | | | SAE (AISI) | 5160 | Chromium | 0,70 | 0,90 |
| | | | WERKSTOFF NO | 1,7176 | Sulphur | 0,00 | 0,04 |
| | | | | | Phosphorus | 0,00 | 0,03 |
| HEAT TREATED CONDITION | | | | | | | |
| Tensile Strength, Mpa minimum | | | | | | | 0 |
| Elongation, percent minimum | | | | | | | 0 |
| Izod Impact Value, Joule | | | | | | | 0 |
| Brinell Hardness Number | | | | | | | 0 |
STD STOCK SIZES (as Rolled)
| Flat Bar | 50 x 6 to 100 x 22 | Round Bar | 10mm to 38 mm DIA |
|---|
General Heat Treatment Information on Steel Grades SAE 5160
Chemical
In a high carbon-chromium steel grade used mostly for the manufacure of springs and torsion bars. As quenched hardnesses of up to 63HRc can be obtained.
| Hot forming/ forging/ rolling / pressing | Heat to 1150° (not above 1200°) and finish above 870° |
| Normalising | 870°C - 880°C, cooling in still air |
| Annealing | 830°C - 840°C, cooling in furnace. There are many other cycles that can be used as well to produce a predominantly pearlitic structure. |
| Spheroidising | 650°C - 750°C, Cycles may vary depending on plant, heat treated, etc to produce optimum spheroidisation. | | |
| Hardening | 830°C - 840°C quenching in oil. The components should be removed from the quenching medium when their temperature is roughly 50°C and should not be left in the medium below 30°C to ensure that the components do not crack. |
| Tempering | Depending on hardness required can vary between 150°C and 600°C (see graph attached) the components must be tempered directly after hardening (quenching) to prevent cracking. |
| Austempering | Re-heat to 845°C and quench in a salt bath at 310°C, hold for 1 hour and cool in air. The hardening obtained should be between 46 and 52HRc. No tempering is required. |