Method of casting semi-liquid or semi-solid iron-based alloy and die for casting

A method of casting a semi-liquid or semi-solid iron-based alloy, the method comprising:

• applying, to a part of an uppermost surface of an inner surface of a die between shots of die-casting, a lubricating die-release agent in which particles having a particle diameter of more than 30 μm and 200 μm or less and including at least one selected from molybdenum disulfide, graphite, tungsten disulfide, boron nitride, chrome oxide and boric oxide are dispersed in a solvent having a kinetic viscosity of 5×10−6 to 4×10−5 m2/s at 40° C.;
• and
• thereafter casting by using the die,
• wherein a volume content of the particles in the lubricating die-release agent is 30 to 90%,
• wherein the die includes:
• an injection port;
• a gate;
• and
• a cavity,
• wherein the lubricating die-release agent is applied on inner surfaces of the injection port and the gate but not on inner surfaces of the cavity.