blade to cut rebar
Blades for rebar cutting must focus on high hardness, wear resistance and impact resistance, and are mainly compatible with three types of die steel materials. Selection should be accurately matched according to rebar strength, diameter and cutting conditions (batch/occasional, factory/construction site). The following are core selection conclusions and equipment adaptation suggestions, directly serving practical operation needs.
I. Core Conclusion: Rebar Cutting Blade Material Selection Table
Cutting Scenarios | Recommended Blade Material | Applicable Rebar Type/Diameter | Core Advantages & Precautions |
Occasional/small-to-medium batch cutting at construction sites, small-to-medium projects | 9CrSi (Alloy Tool Steel) | Ordinary medium-low strength round steel, deformed steel bar ≤20mm | Economical and practical, with good hardenability and machinability, outstanding cost-performance ratio, suitable for cutting conventional low-carbon rebar. |
Batch conventional cutting at factories/construction sites, cold working scenarios | Cr12MoV (High Carbon High Chromium Tool Steel) | Ordinary/medium-high strength rebar ≤32mm, high-hardness cold-rolled rebar | High hardness and wear resistance, hardness far exceeding ordinary alloy blades; note that its toughness is relatively weak, avoid high-impact and large-gap cutting conditions. |
Large-diameter rebar, high-strength rebar, heavy-duty equipment cutting | H13 (4Cr5MoSiV1) (Hot Work Die Steel) | HRB400/500 high-strength rebar, rebar with diameter ≥40mm, hot-rolled rebar | It has both extremely high wear resistance and toughness, and excellent thermal cycle resistance; it is not prone to deformation or chipping during long-term high-intensity continuous cutting, suitable for large-scale processing. |
II. Suggestions for selecting a rebar cutting machine blade
• Manual hydraulic rebar cutter : Prioritize 9CrSi blades, suitable for ordinary rebar ≤25mm, balancing Low cost and durability.
• Electric/hydraulic rebar cutting machine : Choose Cr12MoV for conventional models, and H13 for large-tonnage equipment (GQ50,GQ60 and above), adapting to batch cutting needs.
• Heavy-duty gantry shear/CNC processing line: Exclusive H13，H13K blades to cope with severe impact cutting of thick-diameter and high-strength rebar, ensuring stable operation.
III. Key considerations for selecting and using rebar blades
To avoid blade damage, equipment failure and potential safety hazards, strictly follow the following precautions to balance blade life and operation safety:
• Material prohibition reminder: It is strictly prohibited to use carbon tool steel (T8/T10) or cemented carbide blades for rebar cutting. The former has extremely poor toughness, which is prone to chipping and splashing, causing safety accidents; the latter has weak impact resistance, only suitable for thin plate cutting, and is easy to crack when encountering rebar.
• Hardness adaptation requirement: The hardness of blades for rebar cutting should be controlled in the range of HRC 52-62. 9CrSi and Cr12MoV need to reach HRC 57-62, and H13 needs to reach HRC 52-58. Insufficient hardness is prone to rapid dulling, while excessive hardness reduces toughness and easily causes chipping.
• Working condition matching principle: Do not cut beyond the diameter limit. For example, 9CrSi blades cannot cut high-strength rebar ＞20mm; overloading will cause blade deformation and equipment motor overload. For high-impact working conditions (such as cutting large-diameter hot-rolled rebar), prioritize H13 and avoid using Cr12MoV.
The core of rebar cutting blade selection is :
9CrSi cost-performance ratio for small-to-medium batch conventional rebar
Cr12MoV wear resistance for batch cold-processed rebar
H13 impact resistance for large-diameter high-strength rebar