Detailed Technical Specifications and Material Data of Steel Bar Cutting Blades
The following is the complete technical specifications and material data of steel bar cutting blades (steel bar cutting machine blades/round steel cutting blades), covering material grades, compositions, hardness, tolerances, dimensions, heat treatment, gap standards, and service life indicators. It can be directly used for technical selection, bidding documents, quality inspection, and foreign trade parameter sheets.
I. Mainstream Material Grades and Metallurgical Properties (Engineering Grade)
1. Cr12MoV (SKD11 / 1.2379) — Preferred for General Use
- Reference Composition: C 1.45–1.70%, Si ≤0.40%, Mn ≤0.40%, Cr 11.0–13.0%, Mo 0.40–0.60%, V 0.15–0.30%, S/P ≤0.03%
- Hardness: HRC 58–62 (standard);
- Performance: High wear resistance, anti-chipping, small deformation; suitable for HRB400/500 deformed steel bars and conventional cutting of Φ6–50mm steel bars
- Applicable Models: GQ40, GQ50, GQ60 general-purpose models
2. H13 (SKD61 / 1.2344) — Preferred for High Strength/Heavy Duty/Hot Shearing
- Reference Composition: C 0.32–0.45%, Si 0.80–1.20%, Mn 0.20–0.50%, Cr 4.75–5.50%, Mo 1.10–1.75%, V 0.80–1.20%
- Hardness: HRC 48–54 (heavy-duty cutting);
- Performance: High toughness, impact resistance, thermal fatigue resistance, and not easy to break; suitable for large-diameter, high-strength steel bars and continuous heavy loads
- Application: GQ50/GQ60, steel rolling flying shears, prestressed steel bar cutting
3. 9CrSi (9SiCr) — Economical/Light-Duty Cutting
- Composition: C 0.85–0.95%, Si 1.20–1.60%, Cr 0.95–1.25%, Mn 0.30–0.60%
- Hardness: HRC 58–60
- Performance: General wear resistance, medium toughness, low cost; suitable for light-load cutting of Φ6–25mm round steel
II. Standard Dimensions and Tolerances (GQ40/GQ50/GQ60)
- GQ40: 83×83×16/18/20mm; 90×90×18/20mm; single/double holes
- GQ50: 90×90×20/22/25mm; 100×100×25/28mm; double/four holes
- GQ60: 100×100×28/30mm; 130×130×30mm; four holes
- Length/Width Tolerance: ±0.05–±0.10mm
- Thickness Tolerance: ±0.03–±0.05mm
- Flatness: ≤0.02mm/m
- Parallelism/Perpendicularity: ≤0.03mm/100mm
- Cutting Edge Straightness: ≤0.015mm/100mm
III. Heat Treatment and Process Specifications
- Process: Forging (forging ratio ≥3) → Spheroidizing Annealing → Precision Machining → Vacuum Quenching → Deep Cryogenic Treatment (-70℃ to -80℃) → Low-Temperature Tempering (2–3 times)
- Quenching Temperature: Cr12MoV: 1020–1050℃; H13: 1000–1030℃
- Tempering Temperature: Cr12MoV: 180–220℃; H13: 520–560℃
- Hardness Uniformity: ≤±1 HRC for the same blade
- Surface: Precision Grinding Ra 0.4–0.8μm; TiN/TiCN coating optional (HRC 80+, anti-adhesive blade)
IV. Shear Gap and Cutting Quality Standards (Key)
1. Gap Standards (Blade Side Gap)
- Φ6–20mm: 0.3mm
- Φ20–32mm: 0.4mm
- Φ32–50mm: 0.5mm
- Dynamic Gap: 0.02–0.05mm
2. Cutting Quality
- Length Error: ≤±3mm
- End Face Inclination: ≤1.5°
- No splitting, horseshoe shape, or burrs (depth ≤0.3mm)
- Cutting Edge Wear: ≤0.6mm (replacement threshold)
V. Service Life and Replacement Indicators
- Cr12MoV: Approximately 200–300 tons of conventional steel bars per cutting edge
- H13: Approximately 150–250 tons of heavy-load steel bars per cutting edge
- 9CrSi: Approximately 100–150 tons of light-load steel bars per cutting edge
- Replacement Criteria: Increased cutting burrs, excessive end face inclination, steel bar flattening, and cutting edge chipping
VI. Selection Guide (By Working Condition)
Selecting the right blade material based on your specific jobsite requirements is critical to maximizing cutting efficiency and tool longevity. Here is our comprehensive recommendation checklist:
General Construction Site (HRB400/500, Φ6–40mm):
For standard structural steel and deformed rebar processing, Cr12MoV alloy steel heat-treated to HRC 58–62 offers the ideal balance of hardness and wear resistance. If your facility utilizes standard GQ40/GQ50 general-purpose models or equivalent global brands for high-volume onsite cutting, equipping your machinery with premium heavy-duty bar cutter blades will ensure clean, burr-free cuts while drastically minimizing tool replacement cycles.
High-Tensile & Prestressed Concrete Applications (Φ7.1–12.6mm):
When your operation shifts to high-strength, specialized steel processing, standard blades will rapidly dull or fracture. For demanding PHC spun pile plants and prestressed concrete yards, you require a specialized, vacuum-heat-treated PC bar cutter blade engineered to withstand extreme tensile loads without inducing micro-cracks in tool steel.
Scrap Metal Recycling & High-Impact Operations (Φ32–50mm Heavy Duty / Large Diameter):
Continuous shearing of large-diameter bundles or handling highly contaminated steel introduces severe shock loads. For scenarios where concrete residue and mixed scrap metals are prevalent, premium shock-resisting tool steels like H13 (optimized to HRC 50–55 or specialized hardness profiles) are mandatory. Upgrading your heavy hydraulic alligator shears to industrial-grade, shatter-resistant rebar shearing knives is the most effective way to eliminate premature chipping and guarantee uninterrupted operation in harsh recycling yards.
Budget-Friendly / Light Duty Operations (Φ6–25mm, Light Load):
For small-scale construction workshops, mobile handheld cutters, or intermittent cutting tasks involving smaller diameter mild carbon steels, 9CrSi tool steel treated to HRC 58–60 serves as a highly cost-effective and dependable choice for routine, everyday shearing tasks.
