Ohio Pickling & Processing, also known as OPP, is a toll processor of flat roll steel based in Toledo, OH. OPP services large steel service centers and brokers alike. By focusing on individual customer needs, and providing flexibility in developing ways to achieve these needs, OPP has continued to grow. Examples of this innovation and progress range from our auto-flat leveler (learn more on our leveler page) to our cutting edge Parsytec evaluation process (learn more on our Parsytec page).  ohio pickling processing  Located just off the Toledo airline rail yard, we provide our customers an international connection to the world’s steel economy. Increasing your ability to expand your business, deliver a quality product, and exceed your customer’s expectations is what we focus on daily.