The Ultimate Guide To Steel Bar Cutter Blade Materials & Specifications

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); HRC 60–64 (deep cryogenic treatment)

- 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); HRC 54–56 (straightening and 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)

- Conventional Construction (HRB400/500, Φ6–40mm): Cr12MoV, HRC 58–62

- Heavy Duty/Large Diameter (Φ32–50mm, continuous cutting): H13, HRC 48–54

- Economical/Light Duty (Φ6–25mm, light load): 9CrSi, HRC 58–60