< Grinding Media
< Sigma Products Overview
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Steel Grinding Media | |||
| Grinding Media | PERLITE Glass Beads | DURMAX Steel Beads | ZIROX Zirconium Beads |
DURMAX Steel Grinding Media is made for maximum durability due to our Cold Heading manufacturing process.
DURMAX beads are NOT cut from wire and rolled like other media. Cold Heading shapes the ball into a roughly finished size leaving only de-flashing and polishing operations. Cold Heading virtually eliminates all fissures and cracks which lead to bead fragmentation and reduced wear resistance. Cold Heading may cost slightly more than a bead made from a cut wire process, but the result is a media that lasts longer .
DURMAX beads are NOT bulk-packed so as to maintain quality control. Bulk packing results in mixed heat treatment batches and therefore eliminates quality control documentation.
DURMAX Chrome Alloy beads and Stainless Steel beads are through-hardened. Carbon steel beads are Case-Hardened to 1/2 diameter, not 1/4 diameter like other brands.
DURMAX beads have a size tolerance of +/- 1% of diameter, NOT 10% like other beads.
| MATERIALS: | Through-Hardened Chrome Alloy grade E52100, R63C +/- 3 Case-Hardened Carbon Steel grade 1018, R63C +/-3 Through-Hardened Stainless Steel Grade 410, R58C +/-3 |
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| MATERIAL SPECIFICATIONS: | Specific Gravity - 7.85 g/cc
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| PACKING: | 25 lb. boxes in plastic bag with light rust-preventive oil coating | |||
| SIZES: | 1.0mm, 1.5mm, 2.0mm, 3/32",1/8", 5/32",3/16", 1/4", 9/32", larger as special | |||
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Cold Heading Method 1. Wire Rod is fed into the Header 2. Rough Ball is produced with an "equator" of flashing 3. Ball is de-flashed and polished |
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Cut Wire Method 1. Wire Rod is fed into the Cutter 2. Cylindrical slug is cut with length shorter than finished ball diameter. Finished ball diameter is shown by red circle. 3. Material is folded into the void to produce a finished ball |
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| Also Available: Steel Shot | ||||
DURMAX Steel Shot is a drop-chilled shot which undergoes extra processing to eliminate as many odd shaped pieces as possible. Most pieces with voids, tails or hollows are removed. Steel Shot is heat treated for slightly higher hardness. Sizes range from 0.1 to 4 mm. Hardness is R55-60C. Packing is in 50 lb. bags. Bulk density is 4.6 g/cc. Specific Gravity is 7.85 g/cc. |
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