Product Introduction
When sawing high-alloy tool and die steel-such as Cold-Work (D2, D3, A2, O1) or Hot-Work (H13, H11) steels-ordinary blades quickly dull, glaze, or fracture under extreme cutting resistance. Sipu Die Steel Bandsaw Blades are specifically engineered with heavy-duty cobalt high-speed steel and precision-ground micrograin carbide teeth to deliver maximum penetration, minimum kerf loss, and superior blade fatigue resistance.
Whether you run high-volume service centers, forge shops, or contract toolrooms, Sipu provides structural stability and precise dimensional control for cutting solid die blocks, pre-hardened tool steels, and heavy forgings.
Technical Specifications Matrix
| Specification | M42 Bi-Metal (Standard Tool Steel) | M51 Bi-Metal (High-Cr & Heavy Alloy) | Carbide-Tipped (Pre-Hardened & Large Blocks) |
| Tooth Edge Material |
HSS M42 (8% Cobalt) |
HSS M51 (10% Co, 10% W) |
Micrograin Tungsten Carbide (TCT) |
| Backing Material |
High-Flex Alloy Spring Steel |
High-Strength Alloy Steel |
High-Tensile Fatigue-Resistant Alloy |
| Tooth Hardness |
HRC 67–69 |
HRC 68–70 |
HRA 88–92 |
| Blade Widths |
13mm, 19mm, 27mm, 34mm, 41mm, 54mm |
27mm, 34mm, 41mm, 54mm, 67mm |
27mm, 34mm, 41mm, 54mm, 67mm, 80mm |
| Thickness Range | 0.65mm – 1.60mm | 0.90mm – 1.60mm | 0.90mm – 1.60mm |
| Tooth Geometries |
Positive Rake (10°/15°), Variable Pitch |
Aggressive Rake, Deep Gullet |
Precision-Ground Multi-Chip Geometry |
| Available TPI |
2/3, 3/4, 4/6, 5/8 |
1.4/2.0, 2/3, 3/4 |
0.75/1.25, 1/1.5, 1.4/2.0, 2/3 |
| Recommended Hardness | Up to 35 HRC | Up to 42 HRC | 40 HRC to 60 HRC |
Core Operational Advantages
1. Advanced Electron-Beam & Laser Joining Technology
Blade failure most frequently occurs at the joint under intense down-feed pressure. Sipu utilizes automated digital flash-butt and high-energy laser welding to bond the tooth strip to the backing steel. Joint alignment tolerances are held within ±0.02mm, eliminating band tracking wobble, reducing vibration, and virtually removing seam breakage risks during continuous heavy-duty cutting.
2. Multi-Stage Vacuum Heat Treatment
Our proprietary vacuum heat-treating and multi-step tempering protocol balances tooth hardness with backing ductility. The teeth maintain extreme hot hardness up to 600°C without dulling, while the high-flex spring steel backing absorbs severe bending stresses over the band wheels, eliminating back-edge cracking during 72-hour non-stop production runs.
3. Harmonic-Dampening Variable Pitch Design
Sawing large solid die steel bars generates high harmonic resonance that causes micro-chipping on sharp tooth edges. Sipu's variable tooth spacing (e.g., 2/3 TPI or 3/4 TPI) alters tooth impact frequency, cutting chatter by up to 15 dB while enabling smooth chip clearance out of deep kerfs.
Manufacturing Capabilities
Production Capacity: 7 fully automated production lines yielding over 30,000 blade units per day.
Quality Assurance: 100% optical profile projection, metallographic testing, and electronic tooth set measurement.
Private Labeling (OEM): Free laser marking of your brand logo, part numbers, and custom TPI specifications directly onto the band.
Export Protective Packaging: Each blade is treated with high-grade anti-rust oil, sealed in VCI moisture-barrier wrapping, and packed into reinforced wooden crates for ocean freight protection up to 60 days.
FAQ
Q: What causes premature tooth chipping when cutting high-chromium D2 or SKD11 die steel?
A: Tooth chipping usually occurs due to excessive feed speed, incorrect tooth pitch selection, or running a new blade without proper break-in. High-chromium die steels work-harden quickly under friction. Using an aggressive variable tooth pitch (such as 2/3 TPI or 3/4 TPI) with positive rake angles helps penetrate the work-hardened layer cleanly. Always break in new blades at 50% feed rate for the first 20–30 minutes.
Q: Should I select M42 Bi-Metal, M51 Bi-Metal, or Carbide-Tipped blades for forged die blocks?
A: For annealed die steel blocks under 35 HRC, M42 bi-metal blades offer an economical solution. For tougher die alloys containing higher cobalt/vanadium content (up to 40 HRC), M51 bi-metal provides better red-hardness and wear resistance. For pre-hardened die blocks over 40 HRC or large cross-section production forging lines, carbide-tipped blades yield significantly higher cut speeds and 3x to 5x longer service life.
Q: How do I determine the optimal TPI (Teeth Per Inch) for solid die steel billets?
A: Always maintain 3 to 12 teeth in contact with the workpiece. For small die steel bars (under 50mm / 2 inches), use 4/6 or 5/8 TPI. For medium solid blocks (50mm–150mm), 3/4 TPI is recommended. For heavy die steel blocks over 150mm (6 inches), choose coarse 1.4/2.0 or 2/3 TPI to ensure deep gullets carry away heavy metal chips without packing or stalling the band wheel.
Q: What coolant concentration and flow rate work best for alloy die steel sawing?
A: Use a heavy-duty synthetic or semi-synthetic soluble oil with Extreme Pressure (EP) additives diluted to an 8%–12% concentration. Flood coolant must directed straight into the cut kerf and onto both guide blocks to wash away abrasive die steel chips, suppress cutting heat, and prevent thermal micro-cracking along the tooth edges.
Q: What custom sizes and delivery timelines do you offer for overseas wholesale orders?
A: We supply both continuous 100-meter coils and precision factory-welded loops custom-fitted to any machine brand. Standard specification loops ship within 48 hours from our stock warehouse. Bulk OEM custom orders (including custom length, width, and laser-etched branding) are completed within 7 to 14 business days.
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