How to Achieve HRC 60+ Hardness for Combination Pliers with 55 High Carbon Steel

When it comes to industrial-grade combination pliers and diagonal cutting pliers, only the finest materials and precision engineering deliver the strength, longevity, and efficiency professionals demand. At WANZHUO (JIANGSU)HARDWARE TOOLS MANU CO.,LTD, a professional manufacturer of high-grade industrial pliers based in Xuzhou City, Jiangsu Province, China, we  combine high-carbon steel, advanced heat treatment, and laser-hardened cutting edges to produce tools that outperform competitors.

Our Premium Combination Pliers & Diagonal Cutting Pliers are designed for maximum durability, 30% easier cutting force, and superior insulation (VDE-certified handles)—making them the top choice for electricians, mechanics, and industrial workers worldwide.

Combination pliers require exceptional hardness (above HRC 60) for durability and performance. Using 55 high carbon steel, manufacturers can achieve this through precise heat treatment. The process involves:

1. Quenching – Heating to 800-850°C followed by rapid oil or water cooling to increase hardness.

2. Tempering – Reheating to 200-300°C to reduce brittleness while maintaining HRC 60+ hardness.

Proper heat treatment ensures combination pliers resist wear and deformation, making them ideal for heavy-duty tasks. High-carbon steel like 55-grade offers excellent strength, making Premium Combination Pliers & Diagonal Cutting Pliers a top choice for professional-grade hand tools.

Why Our Combination Pliers & Diagonal Cutting Pliers Stand Out?

1. Premium High-Carbon Steel & Chrome-Vanadium Alloy

We use 55 high-carbon steel and Cr-V to ensure:

• HRC 60+ hardness for extreme wear resistance.

• Superior toughness to prevent chipping or cracking.

• Long-lasting sharpness even under heavy-duty use.

2. Advanced Heat Treatment & Laser-Hardened Cutting Edges

Achieving HRC 60+ hardness requires precision:

• Precision Austenitizing (820–850°C) for optimal hardness.

• Controlled Quenching (Oil/Polymer) to prevent brittleness.

• Low-Temperature Tempering (150–200°C) to retain toughness.

• Laser Hardening on Cutting Edges for ultra-sharp, wear-resistant jaws.

3. 30% More Efficient Cutting & Gripping

Our diagonal cutting pliers and combination pliers feature:

• Optimized jaw geometry for 30% reduced cutting force.

• Precision-ground edges for clean cuts on wires, cables, and bolts.

• Ergonomic handles for fatigue-free operation.

4. 1000V VDE-Insulated Handles for Maximum Safety

• Certified insulation protects against electrical shocks.

• Non-slip, cushioned grip for better control.

• Durable, chemical-resistant coating for long-term use.

5. Rigorous Quality Control – 30+ Dedicated Inspectors

Every combination plier and diagonal cutting plier undergoes:

• Hardness testing (HRC 60+ verification).

• Microstructure analysis for uniform martensite.

• Functional & endurance testing (50,000+ cycles).

Full Production Process – From Raw Steel to Finished Pliers

1. Material Selection – Only high-carbon steel & Cr-V alloy are used.

2. Precision Forging – CNC-controlled forging for perfect jaw alignment.

3. Heat Treatment – HRC 60+ hardness through controlled quenching & tempering.

4. Laser Hardening – Cutting edges receive extra hardening for longevity.

5. Grinding & Polishing – Smooth, burr-free surfaces for precision.

6. VDE Handle Molding – High-grade insulation for electrical safety.

7. Final Inspection – 30+ QC experts verify every detail.

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