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H13 is a tool steel that Trend uses to good effect for the production of premium piston pins. It is probably the best all-round material for most applications, especially in power-adder engines; it is also a popular choice in Pro Stock drag racing engines. The H13 piston pin, which has a Rockwell hardness value around Rc54, has largely succeeded the alloy steel 9310 pin The 9310 material tempers (degree of hardness) at around 300 degrees while the H13 tempers in the neighborhood of 1000 degrees. H13 is a tool steel that Trend uses to good effect for the production of premium piston pins. It is probably the best all-round material for most applications, especially in power-adder engines; it is also a popular choice in Pro Stock drag racing engines. DLC (Diamond-Like Carbon) coating.The temperature for applying the DLC is around 400 degrees. So the application of DLC changes the structure of the alloy steel. However, the advantages of applying diamond-like coatings to alloy steels still out-weigh the disadvantages.