If you have a heat treatment problem or require further information or advice please don't hesitate to contact Merit Heat Treatment Ltd on 01794 257135. (Its good to talk)
We can treat the following metal types,
Titanium and Titanium Alloys
Case hardening steels
Nickel alloy steels
Cast Iron / Steel
Carbon is the most important hardening element in steel or cast iron and for the process to work there should be at least 0.3% carbon and preferably more than 0.35%. As the carbon content increases so does the hardness obtained.
There are other elements which affect the hardening process such as manganese, chromium, molybdenum, nickel and silicon, but carbon is by far the most influential.
Below we list some commonly available steels and typical results obtained by flame hardening. The final surface hardness achieved depends on the chemical composition of the steel, the quenchant used (air, water, oil or polymer) and the section thickness of the component.
The values quoted below are representative only.
1045 carbon steel (0.45% carbon). Most common steel used for gears, pins, bushes, washers and wear plates. Typical hardness 45-55HRc
4140/709M alloy steel (0.40% carbon). Higher core strength than 1045. Used for the same items but more highly stressed applications. Typical hardness 50-60HRc
4340 alloy steel (0.40% carbon). Nickel content provides a good combination of hardness and toughness. Used in highly stressed applications. More difficult to heat treat than 1045 or 4140 since it is prone to quench cracking. Typical hardness 50-60HRc
EN25 alloy steel (0.30% carbon). High strength alloy steel with high hardenability, toughness and fatigue resistance. Used for gears, shafts and axles of large section. Typical hardness 45-55HRc
EN26 alloy steel (0.40% carbon). Similar to EN25 but higher levels of hardness and wear resistance. Typical hardess 55-60HRc
XK1340 carbon steel (0.40% carbon). Used for similar applications as 1045. Manganese content provides improved toughness over equivalent plain carbon steel. Typical hardness 45-55HRc
K245 tool steel (0.65% Carbon). Shock resisting tool steel with extreme toughness, edge retention and wear resistance. Typical hardness 55-65HRc
Martensitic stainless steel (400 series) and many other carbon steels, alloy steels, tool steels and cast irons may be successfully flame or induction hardened.
Feel free to give us a call on 01784 257135