The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

6: Heat Treatment
Annealing 
    Annealing of 4130 steel forgings may be carried out by transferring the part straight from the forging operation to a furnace held at a suitable temperature, around 860o C (1575 o F) for annealing, holding for a suitable time then furnace cooling. In this way a structure suitable for machining may be obtained. This treatment is best used for parts with simple shapes. If the 4130 forging is such that some sections will finish much colder than others then a uniform structure will not be obtained and for best results a spheroidizing anneal at around 750 o C (1380 o F) may be used. It is safe to say that experience alone will decide the best type of annealing treatment to be used prior to machining.
    It should then be cooled in the furnace at a rate of less than 50 F per hour down to 900 F, followed by air cooling from 900 F.
Normalizing
    The nominal normalizing temperature for 4130 is 900 o C (1650 o F) followed by the 1600 F soak and oil quench, but production experience may necessitate a temperature either 50 o F (10 o C) above or below this figure. In fact when forgings are normalized before, for example, carburizing or hardening and tempering, the upper range of normalizing temperatures is used. When normalizing is the final heat treatment, the lower temperature range is used.
Hardening
    The steel 4130 should be austenitized – i.e. all micro constituents transformed to austenite – at 1500 to 1600 o F (815 to 870 o C). The actual austenitizing temperature is a function of chemical composition within the analysis range, section size and cooling method. Smaller sections of 4130 might be quenched in oil, heavier sections in water.
Tempering 
    The actual tempering temperature will depend on what required properties are needed. Alloy steel 4130 is tempered at between 398 oC -565 oC (750 F and 1050 F), depending upon the strength level desired. The lower the tempering temperature the greater the strength.