From a six metre steel rod heated up to 1200°C to an elegant and precise golf club ground by eye and hand, our forging process guarantees that the metals natural grain is preserved in every step of the process.
CAST VS. FORGED
1025E PURE SELECT MILD CARBON
The steel behind Mizuno's softest feeling irons. Used in our one piece irons for higher level players seeking the ultimate in precision and feedback. 1025 is used for its balance of strength, bend‐ability and feel. The evolution to 1025E reduces unnecessary elements that occur during the forging process – phosphorus and sulphur.
Boron Infused Steel
Introduced in 2014 to combine the precision of a forged iron with the ball speed of a distance iron. Widely used in other industries, the smallest trace of boron to the steel mix increases its strength during manufacture. Allowing Mizuno to create more complex one piece Grain Flow Forged irons like the MP‐25, for a balance of feel, precision and increased ball speeds.
Boron steel vs 1025E Pure Select Mild Carbon steel
A simple bladed iron like MP‐5 would have identical feel and performance from either a Boron infused or mild carbon steel billet. The Boron is only impactful when a more complex head design is required. Post manufacture both materials behave near identically.
Cookie cutter roughly trims off the excess metal from the cooled heads, known as the flash…
Final Grain Flow Forged head ready for stamping, polishing, plating and assembly.