High Chromium Wear-Resistant Blocks and Plates
BTMCr26 and BTMCr32 Specifications
BTMCr26 High Chromium Wear-Resistant Block:
BTMCr26 is known for its durability and wear resistance.
BTMCr32 High Chromium Coal Mill Counterattack Plate:
The BTMCr32 plate, used in coal mills, faces significant challenges during heat treatment.
Heat Treatment Challenges
Scrap Rates:
- Small and medium-sized plates (up to 1000 mm × 500 mm × 25 mm): Scrap rate is typically 10-15%.
- Large plates (above these dimensions): Scrap rate can be around 50%.
- Average annual scrap rate: Approximately 16%.
Production Difficulties:
The diverse specifications and geometric shapes make production challenging.
Causes of Cracking
Factors Contributing to Cracking:
- Intrinsic quality of the casting.
- Appearance quality.
- Size and geometry.
- Chemical composition.
However, the primary cause is the heating and cooling conditions during heat treatment.
Volume Changes During Heat Treatment:
- Heating: Volume increases.
- Cooling: Volume decreases.
- Stress and Cracking: Rapid heating increases volume quickly, causing stress and cracks. If the liner is placed too tightly in the sand box, restricted volume expansion also leads to stress and cracking.
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