T15 tungsten-vanadium powder-metallurgy tool steels traditionally gain favor for high-speed high-performance cutting tools. Here, a wiper-blade manufacturer engages the PM tool steel for stamping prehardened spring steel. I've noticed them, and maybe you have too - what the automotive industry refers to as "beam blades," relatively newly designed steel-blade wipers that distribute all of the force on the wiper arm to the middle of the unit. The curved spring-steel blade, says manufacturer Trico Products, is bonded to the length of the rubber wiping blade. The design creates infinite pressure points and continuous pressure across the length of the wiper. Compared to the conventional wiper design most of us grew up with (a pivoting U-shaped shaft accompanied by smaller pivoting shafts that held the rubber blade via two springy steel strips), windshield cleaning and durability is vastly improved.
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