Our goal at Shumaker Industries is to manufacture all new replacement drums that will last a long time. The single most important factor in making a long lasting replacement drum is using high quality steel. The steel that goes into every Shumaker drum is a quality, high strength, abrasion resistant material. Read on to find out how we do it.
1) Develop an ongoing relationship with a domestic supplier.
Shumaker Industries consistently purchases steel from domestic mills. During a time when prices have soared to over twice their recent value and fierce competition has forced other manufacturers to buy foreign material, Shumaker Industries has remained loyal to domestic mills because of their commitment to using the best steel in their drums and other products. Shumaker Industries does not purchase foreign market steel at a lower price because this material may have different physical properties from order to order. Instead, we control the quality of our plate material by purchasing from the same domestic mill in heat lots so that we receive quality plates that are consistent drum after drum, year after year.
2) Develop a special formula for plate steel that meets the demanding wear requirements of the concrete industry.
Together with Shumaker Industries’ understanding of concrete mixers and domestic mills’ experience in producing high quality specialty products, we have developed a formula that best serves the needs of the ready mix concrete industry. In fact, the formula is proprietary in nature, meaning Shumaker Industries has sole rights to its use and no other manufacturer in the industry is permitted to use it.
3) The result is a formula for Abrasion Resistant (AR) plate that achieves the following:
- Average Brinell hardness of 200.
- Thru-plate hardness.
**IMPORTANT** Brinell hardness refers to the surface hardness of the material. While this is significant, it is more important to achieve thru-plate hardness which allows the drum shell and blades to resist wear throughout the thickness of the plate, not just on the surface.
- True thickness (3/16″ = .187” and 1/4″ = .250″).
Domestic plate and sheet metal is measured using the English system, while foreign mills use the metric system (millimeters). The result is that foreign market metals can often be several thousandths of an inch thinner than domestic metals. This can mean a built in savings of around $800 over the life of the drum when domestic steel is used.