ZCC.CT DCMT070204-HM YBM251 Carbide Turning Inserts for Stainless Steel
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DCMT070204-HM YBM251 Stainless Steel Turning Inserts
Product Overview
"Which carbide insert is best for achieving high surface quality and chip control when semi-finishing 304 or 316 stainless steel?"
The DCMT070204-HM YBM251 is a premium 55° rhombic positive insert engineered specifically for Stainless Steel (M-Class). By combining the YBM251 grade—which features a specialized CVD coating with high thermal stability—and the -HM (Medium-Duty) chipbreaker, this tool excels in managing the work-hardening tendencies of stainless materials. Its sharp cutting edge and reinforced geometry ensure stable machining during continuous and slightly interrupted cuts.
Key Advantages
- ✔ YBM251 Specialized Grade: A tough substrate with thick CVD coating for M15–M35 applications.
- ✔ -HM Chipbreaker: Optimized for medium-duty chip control, preventing the "long bird-nest" chips common in stainless steel.
- ✔ Heat Resistance: High resistance to plastic deformation and notch wear.
- ✔ Positive Geometry: Reduces cutting forces, making it ideal for small-diameter boring or thin-walled workpieces.
Nomenclature Decoding
55° Rhombic
7° Relief
Medium Tol.
Hole/Feature
7.75mm Edge
2.38mm Thick
0.4mm Radius
Technical Specifications
| Dimension | Metric (ISO) | Inch (ANSI) |
|---|---|---|
| Model Number | DCMT070204-HM | DCMT 21.51-HM |
| Inscribed Circle | 6.35 mm | 0.250" |
| Thickness | 2.38 mm | 0.094" |
| Nose Radius | 0.4 mm | 0.016" |
Recommended Cutting Parameters
| Cutting Speed (Vc) | 140 - 240 m/min |
| Feed Rate (f) | 0.10 - 0.25 mm/rev |
| Depth of Cut (ap) | 0.5 - 2.5 mm |
Compatible Holders
Optimized for standard SDJCR/L and SDUCR/L Holders:
SDJCR1010H07 | SDJCL1212H07 | S10K-SDUCR07
View Compatible Holders →Applications
- Semi-finishing of Austenitic Stainless (304, 316).
- Turning of Duplex Stainless Steels.
- Internal boring operations on stainless tubes.
- CNC production of valve and pump components.
Grade Comparison
- YBM251 (Current): General semi-finishing of stainless steel.
- YBM151: Higher speed, stable finishing.
- YBG205: PVD coated for small parts and high precision.
Why Choose ZCC.CT Tools?
ZCC.CT is a global leader in cemented carbide research and production. Our YBM series for stainless steel represents years of alloy optimization, delivering tool life and surface finishes that compete with top-tier brands at an unmatched value for industrial workshops.
What Our Global Clients Say
⭐⭐⭐⭐⭐
"Best for 304 Stainless"
We use these in our Texas shop for valve parts. The HM chipbreaker works perfectly at medium speeds.
— Mike R., USA⭐⭐⭐⭐⭐
"Sehr Gut"
Excellent thermal resistance. No notch wear after multiple batches of 316L.
— Hans P., Germany⭐⭐⭐⭐
"Affidabile"
Consistent quality across batches. Our CNC operators prefer these for stainless work.
— Marco F., Italy⭐⭐⭐⭐⭐
"信頼できるパフォーマンス"
ZCC.CT is our standard now for stainless turning in Japan. Very stable tool life.
— Kenji S., JapanFrequently Asked Questions
A: For stainless steel, coolant is highly recommended to control temperature and prevent built-up edge, though YBM251 has excellent heat resistance.
A: -HM is for medium-duty semi-finishing, while -HF is designed for high-precision light finishing with smaller depth of cuts.
A: While possible, it is optimized for the work-hardening characteristics of stainless. For carbon steel, the YBC series is more cost-effective.
Material Comparison Tip: When machining Austenitic Stainless, the work-hardening layer is your enemy. Use the DCMT070204-HM with a steady feed rate of at least 0.12mm/rev to stay below the hardened zone for maximum tool life.
Technical FAQ & Buying Guide
Absolutely. Our CNC carbide inserts (including CNMG, WNMG, DNMG, and APMT series) are manufactured strictly adhering to international ISO/ANSI specifications. A CNMG 120408 from OYYU BEYOND will flawlessly fit any standard turning tool holder or indexable tool from major global brands like Sandvik Coromant, Kennametal, Iscar, Walter, or SECO, providing a highly cost-effective premium alternative without sacrificing tolerance or tool life.
We offer optimized CVD and PVD multi-layer coatings for different ISO material groups:
- For Carbon/Alloy Steel (ISO P): Choose our thick multi-layer CVD coated grades (e.g., Al2O3 + TiN). They provide exceptional crater wear resistance and thermal barriers during high-speed dry or wet roughing.
- For Stainless Steel (ISO M): Choose our nano-structured PVD coated grades with sharp, positive chipbreakers (like -TM or -MA). This combination prevents work hardening and effectively controls sticky chips.
The optimal cutting parameters vary depending on the workpiece hardness and operation type:
- For General Steel Turnings: Recommended cutting speed ($V_c$) ranges from 150 to 280 m/min, with a feed rate ($f$) of 0.15 to 0.45 mm/rev.
- For Stainless Steel Finishing: Recommended cutting speed ($V_c$) is 120 to 200 m/min, with a feed rate ($f$) of 0.10 to 0.25 mm/rev.Always adjust parameters based on early wear patterns: increase $V_c$ if built-up edge occurs, or reduce $V_c$ if severe flank wear is observed.
Yes, we support machine shops, distributors, and global buyers with tiered wholesale pricing and competitive volume discounts. We also provide OEM custom manufacturing solutions for tool holders and carbide inserts based on your technical drawings. Contact our team to request a quick B2B quotation.
We provide secure worldwide express shipping (via DHL, FedEx, and UPS) with specialized, vibration-proof industrial packaging to ensure tools arrive in perfect condition. In-stock items are dispatched within 24-48 hours, while custom or bulk orders typically have a stable lead time of 15-25 days.
All our cutting tools and tool holders are manufactured strictly in accordance with ISO 9001 and international industrial standards. Every batch undergoes 100% rigorous quality control testing using high-precision optical measuring equipment to ensure reliable tool life and stable performance in continuous mass production.