Scroll compressor including fixed and orbiting scroll having stepped portions and a surface hardened treatment

A scroll compressor comprising:

• a fixed scroll comprising a spiral-shaped wall portion disposed in an upright manner on a side surface of an end plate;
• an orbiting scroll comprising a spiral-shaped wall portion disposed in an upright manner on a side surface of an end plate, the orbiting scroll being supported in a manner capable of orbiting motion with the two wall portions meshing while being prevented from self rotation;
• a discharge port through which a fluid compressed by the two scrolls is discharged;
• a single end plate step portion provided on the end plate of one of the two scrolls formed on the side surface of the end plate of the one of the two scrolls so that a height of the end plate of the one of the two scrolls is higher on a center portion side in the direction of the spiral-shaped wall portion of the one of the two scrolls and lower on an outer end side, the single end plate step portion being provided on the end plate of one of the two scrolls that is approximately 180 degrees along a length direction of the spiral-shaped wall portion of the one of the two scrolls spirally inbound from an outer end position where the spiral-shaped wall portion of the one of the two scrolls ends;
• and
• a single wall portion step portion provided on the spiral-shaped wall portion of the other of the two scrolls that corresponds to the single end plate step portion so that a height of the spiral-shaped wall portion of the other of the two scrolls is lower on a center portion side of the spiral-shaped wall portion of the other of the two scrolls and higher on an outer end side,
• wherein the scroll on which the single end plate step portion is provided is treated for surface hardening and the other scroll is not treated for surface hardening.