Iron-base alloy for rotary type compressors

A compressor comprising a cylinder having a suction port and a discharge port, a roller which eccentrically rotates in the cylinder, and a vane which is constantly enforced to be in contact with the roller by biasing force of bias means, in which a refrigerant intaken into the cylinder through the suction port is compressed by the roller and the vane, and discharged out of the cylinder through the discharge port,

• wherein said roller is made of an iron base alloy essentially consisting of, by weight, 2.0 to 3.9% total carbon, 2.0 to 3.0% Si, 0.3 to 1.0% Mn, up to 0.10% S, more than zero and not more than 0.50% V, 0.3 to 1.0% P, 0.01 to 0.5% Sb, 0.001 to 0.5% B, and balance of Fe and incidental impurities.

A roller in a compressor comprising a cylinder having a suction port and a discharge port, the roller which eccentrically rotates in the cylinder, and a vane which is constantly enforced to be in contact with the roller by biasing force of bias means, in which a refrigerant intaken into the cylinder through the suction port is compressed by the roller and the vane, and discharged out of the cylinder through the discharge port, said roller being made of an iron base alloy essentially consisting of, by weight, 2.0 to 3.9% of total carbon, 2.0 to 3.0% Si, 0.3 to 1.0% Mn, up to 0.10% S, more than zero and not more than 0.50% V, 0.3 to 1.0% P, 0.01 to 0.5% Sb, and balance of Fe and incidental impurities.

A roller in a compressor comprising a cylinder having a suction port and a discharge port, the roller which eccentrically rotates in the cylinder, and a vane which is constantly enforced to be in contact with the roller by biasing force of bias means, in which a refrigerant intaken into the cylinder through the suction port is compressed by the roller and the vane, and discharged out of the cylinder through the discharge port, said roller being made of an iron base alloy essentially consisting of, by weight, 2.0 to 3.9% of total carbon, 2.0 to 3.0% Si, 0.3 to 1.0% Mn, up to 0.10% S, more than zero and not more than 0.50% V, 0.3 to 1.0% P, 0.01 to 0.5% Sb, 0.001 to 0.5% B, and balance of Fe and incidental impurities.

A vane in a compressor comprising a cylinder having a suction port and a discharge port, a roller which eccentrically rotates in the cylinder, and the vane which is constantly enforced to be in contact with the roller by biasing force of bias means, in which a refrigerant intaken into the cylinder through the suction port is compressed by the roller and the vane, and discharged out of the cylinder through the discharge port, said vane being made of an iron base alloy essentially consisting of, by weight, 1.0 to 2.5% of total carbon, more than zero and not more than 1.5% Si, more than zero and not more than 1.0% Mn, 3.0 to 6.0% Cr, at least one of more than zero and not more than 20.0% W and more than zero and not more than 12.0% Mo in such a range as to satisfy the formula 15.0%.ltoreq.W+2Mo.ltoreq.28.0%, 3.5 to 10% at least one of V and Nb, 1.0 to 15.0% at least one of Co and Ni, and balance of Fe and incidental impurities.