How to Choose Round Shank Chisel? Round Shank Chisel B47K22h
详细信息
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The B47K22H is a heavy-duty round shank chisel (bullet tooth) with a 38/30mm step shank and a 22mm tungsten carbide tip, engineered primarily for rotary drilling rigs, rock augers, core barrels, and drilling buckets in deep foundation bored piling.
When selecting or specifying B47K22H picks for a project, evaluate the following technical criteria:
1. Ground Conditions & Unconfined Compressive Strength (UCS)
Target Rock Hardness: B47K22H is best suited for soft to medium-hard rock and strongly-to-moderately weathered formations (typically 20 MPa to 100 MPa, such as weathered granite, sandstone, limestone, mudstone, and shale).Carbide Tip Selection:
Abrasive Formations (Sandstone, Siltstone, Gravel): Choose coarse-grain tungsten carbide grades for maximum abrasion resistance.
High-Impact Formations (Intermittent Boulders, Weathered Granite): Opt for carbide grades with slightly higher Cobalt content to increase impact toughness and prevent micro-chipping or head fracturing.
2. Steel Body Material & Heat Treatment
Steel Grade: Ensure the tool body is hot-forged from high-grade alloy steel such as 42CrMo or 40Cr /. Avoid cast or low-alloy bodies that can snap under high drilling torque.
Hardness Profile:
Body Hardness: Look for heat-treated bodies with 40-44 HRC toughness. This prevents shank bending or socket mushrooming while maintaining impact absorption.
Carbide Hardness: Should be 88-92 HRA (or >50 HRC equivalent) for wear resistance.
3. Anti-Wear Protection (Hardfacing / Skirt Strips)
Standard Body: Suitable for non-abrasive clay, marl, or cohesive soils.Hardfaced Body (Anti-Wear Weld Overlay): For abrasive ground containing quartz sand, pebbles, or decomposed rock, choose B47K22H variants featuring tungsten carbide hardfacing strips or ring welds around the head/skirt. Hardfacing prevents "body wash" (where abrasive slurry wears away the steel holding the carbide tip before the tip itself wears out).
4. Holder Compatibility & Free Rotation Holder Fit: Ensure compatibility with standard 38mm / B47 series tool holders (such as B43H, B85, or C30 holders).
Retainer Clip: Check that the retaining ring/sleeve provides adequate tension to hold the tooth securely during withdrawal while allowing 360° free rotation during operation.Self-Sharpening Effect: Bullet teeth must rotate inside their holders as they cut. Free rotation ensures symmetrical conical wear; if slurry locks the shank in the holder, flat spots will form and destroy the tooth rapidly.
5. Brazing Quality
Induction Brazing: High-quality B47K22H teeth utilize automated silver-copper induction brazing between the tungsten carbide insert and the steel pocket. Ensure there are no voids in the braze seam, which could cause tip loss under shear stress.Quick Reference Matrix
| Factor | Standard B47K22H | Hardfaced / Enhanced B47K22H |
| Primary Formation | Weathered rock, mudstone, clay with cobbles | Abrasive sandstone, gravelly layers, decomposed granite |
| UCS Range | 20 - 100 MPa | 40 - 100+ MPa |
| Body Protection | Smooth steel skirt | Hardfaced welding rings / carbide strips |
| Key Failure Risk | Abrasive body wash | Carbide impact chipping (if rock exceeds 70 MPa) |
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