The present invention relates to a steel composition, to the process for manufacturing same, to the steel blank obtained having a hardness of between 46 and 48 HRC and a resilience KV at 40 C. of at least 40 joules, and to the use thereof for manufacturing a pressure appliance component.

The present invention relates to a steel composition, to the process for manufacturing same, to the steel blank obtained having a hardness of between 46 and 48 HRC and a resilience KV at 40 C. of at least 40 joules, and to the use thereof for manufacturing a pressure appliance component.

A steel alloy is disclosed. The alloy contains in weight percent:

TABLE-US-00001 C about 0.21-about 0.27 Mn about 0.1 max. Si about 0.1 max. P about 0.005 max. S about 0.002 max. Cr about 1.2-about 1.8 Mo about 1.1-about 1.9 V about 0.2-about 0.4 Ni about 3.0-about 3.8 Nb about 0.005-about 0.03 Cu about 0.10 max. Al about 0.02 max.
The balance of the alloy is iron, impurities, and incidental amounts of residual elements that do not adversely affect the basic and novel properties provided by the alloy. An article of manufacture and method of making same are also disclosed.

A steel alloy is disclosed. The alloy contains in weight percent:

TABLE-US-00001 C about 0.21-about 0.27 Mn about 0.1 max. Si about 0.1 max. P about 0.005 max. S about 0.002 max. Cr about 1.2-about 1.8 Mo about 1.1-about 1.9 V about 0.2-about 0.4 Ni about 3.0-about 3.8 Nb about 0.005-about 0.03 Cu about 0.10 max. Al about 0.02 max.
The balance of the alloy is iron, impurities, and incidental amounts of residual elements that do not adversely affect the basic and novel properties provided by the alloy. An article of manufacture and method of making same are also disclosed.

The present disclosure relates to an induction annealing apparatus adapted to anneal cartridge cases to improve their reusability. In one implementation, the apparatus includes a power supply unit and a plurality of annealing units, each including a magnetic core having ends separated by an air gap. An induction coil is wound around the magnetic core to generate a magnetic field in the air gap. A cartridge case holder holds the cartridge case such that the neck of the cartridge case is positioned in one of the air gaps. The power supply unit selectively connects to the annealing units to supply power for a predetermined length of time, and the size of the air gap of the magnetic cores of each of the annealing units may differ. In other implementations, the size of the air gap may be adjustable, and a temperature sensor or a ferrite stake may be included.

The present disclosure relates to an induction annealing apparatus adapted to anneal cartridge cases to improve their reusability. In one implementation, the apparatus includes a power supply unit and a plurality of annealing units, each including a magnetic core having ends separated by an air gap. An induction coil is wound around the magnetic core to generate a magnetic field in the air gap. A cartridge case holder holds the cartridge case such that the neck of the cartridge case is positioned in one of the air gaps. The power supply unit selectively connects to the annealing units to supply power for a predetermined length of time, and the size of the air gap of the magnetic cores of each of the annealing units may differ. In other implementations, the size of the air gap may be adjustable, and a temperature sensor or a ferrite stake may be included.