Product Introduction
The Carbon Steel Metal Blade from Sipu provides an optimal cutting solution for service centers, structural steel fabricators, and machinery maintenance shops processing low-to-medium strength ferrous and non-ferrous metals. Designed specifically for wholesale distributors seeking reliable inventory, these high-carbon tool steel blades strike an optimal balance between initial tool economy, cutting speed, and flexural fatigue resistance.
Unlike standard market alternatives that suffer from premature tooth wear or unpredictable weld failures, Sipu manufactures its carbon steel band saw blades using precision cold-rolled alloy strip combined with controlled induction hardening. This engineering approach delivers clean, straight cuts while minimizing downtime for heavy-duty industrial applications.
Technical Specifications
| Blade Width (inch / mm) | Thickness (inch / mm) | Available TPI (Teeth Per Inch) | Recommended Material Thickness | Primary Application |
| 1/4" / 6.35 mm | 0.025" / 0.65 mm | 10, 14, 18, 24 | < 3 mm | Sheet metal, thin-walled tubing |
| 1/2" / 12.7 mm | 0.025" / 0.65 mm | 6, 8, 10, 14, 18 | 3 mm – 12 mm | Structural angles, channels, small bars |
| 3/4" / 19.0 mm | 0.035" / 0.90 mm | 4, 6, 8, 10, 14 | 10 mm – 35 mm | Medium solids, thick-walled pipes |
| 1" / 27.0 mm | 0.035" / 0.90 mm | 3, 4, 6, 8, 10 | > 30 mm | Large carbon steel bars, aluminum blocks |
Core Engineering Advantages
1. High-Carbon Alloy Strip Composition
Engineering Standard: Manufactured from premium cold-rolled high-carbon steel containing 0.75% carbon content, providing a fine pearlite microstructure.
Performance Data: Yield tensile strength exceeds 1,450 MPa, resisting elongation and micro-strains under high machine tension.
2. Dual-Zone Induction Hardening Process
Edge vs. Backing Separation: Tooth tips undergo high-frequency induction hardening to 62–65 HRC, ensuring long-lasting edge sharpness. Simultaneously, the blade backing is tempered to 40–44 HRC.
Performance Data: This dual-zone hardness gradient increases flex-fatigue resistance by 35%, preventing sudden blade cracking during high-speed flexing.
3. Precision CNC Tooth Setting
Alignment Control: Left-and-right tooth set deviations are strictly controlled within a tolerance of ±0.015 mm using optical sensor-guided CNC machinery.
Operational Impact: Eliminates blade wandering, reduces thermal friction, and maintains a clean cutting path with deviation under 0.08 mm per 100 mm of depth.
4. Flash Butt Welded Seams
Weld Integrity: Every custom-length loop utilizes automated flash butt welding followed by localized infrared annealing.
Quality Verification: Weld joint tensile strength reaches ≥ 92% of the parent material. Every welded loop passes a strict 180-degree reverse bend test before packaging.
Manufacturing Process
Sipu operates an integrated production workflow to guarantee batch-to-batch consistency for long-term wholesale partners:
Raw Material Inspection: Every steel coil undergoes chemical composition analysis via optical emission spectrometry to verify carbon consistency.
Corrosion Protection: Each blade is treated with high-grade anti-rust oil, wrapped in moisture-resistant VCI paper, and packed in reinforced export cartons or fumigation-free wooden crates for safe global transit.
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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