QSP Penguin Plus CPM 20CV Blade Review: Performance and Edge Retention

When evaluating an everyday carry (EDC) pocket knife, enthusiasts and professionals alike return to a fundamental truth: the blade steel is the heart of the tool. While a knife’s handle ergonomics and deployment action define how it feels, the steel itself determines how the knife performs under pressure.

The original QSP Penguin made waves across the knife community by delivering excellent utility at an incredibly low price point, primarily utilizing standard D2 tool steel. However, the upscaled QSP Penguin Plus takes a massive leap into the high-end production market. By outfitting this larger, beefier iteration with premium CPM-20CV super-steel, QSP has transformed a budget favorite into an elite cutting machine. This deep dive review focuses specifically on the performance, metallurgy, and edge retention of the QSP Penguin Plus blade.

The Metallurgy of CPM-20CV Super-Steel

To appreciate the cutting performance of the Penguin Plus, one must understand what happens at the molecular level of Crucible Industries’ CPM-20CV. Manufactured via the Crucible Particle Metallurgy (CPM) process, this steel benefits from a highly uniform, fine carbide distribution that traditional pouring and cooling methods cannot replicate.

CPM-20CV is heavily packed with vanadium and chromium. This specific chemical composition yields unique performance characteristics:

• High Wear Resistance: Large amounts of vanadium carbides give the steel a high level of hardness and abrasion resistance, allowing it to withstand extreme friction without dulling.

• Exceptional Corrosion Resistance: Boasting a high percentage of chromium, CPM-20CV stands among the most stainless steels in the premium category, significantly outperforming tool steels like D2 or carbon steels in wet, humid, or coastal conditions.

• Fine Edge Stability: The particle metallurgy process ensures there are no large, brittle carbide clusters, allowing the factory edge to be sharpened to a razor-fine angle without sacrificing structural integrity.

Blade Geometry: The Power of the Straight Sheepfoot

A great steel is only as good as the geometry it is ground into. The Penguin Plus utilizes QSP’s signature sheepfoot blade profile. Unlike traditional drop-point or clip-point blades that feature a sweeping belly, the sheepfoot provides a completely straight cutting edge.

This straight edge is highly optimized for daily utility tasks. When you make a pull-cut through heavy material, the entire length of the blade remains parallel to the material being cut. This ensures that uniform pressure is applied from the heel of the blade all the way to the tip, preventing slipping and reducing user hand fatigue.

Furthermore, QSP has masterfully executed a flat grind on the Penguin Plus. The spine provides ample thickness to handle heavy downward forces, but tapers down cleanly to a thin, highly aggressive cutting apex. It is a configuration designed to slice, slice, and keep on slicing.

Real-World Edge Retention Testing

In practical daily use, how does the CPM-20CV blade on the Penguin Plus hold up? To put it simply: it is a night-and-day difference compared to standard budget folders.

Cardboard and Packaging Breakdowns

Cardboard is notoriously abrasive due to the silicates embedded within recycled paper fibers. D2 steel will typically begin to lose its shaving-sharp edge after breaking down a dozen heavy appliance boxes. In contrast, the CPM-20CV on the Penguin Plus maintains its factory-slick slicing capabilities through extensive volumes of dense cardboard, showing zero micro-chipping or rolling along the apex.

Field and Rope Cutting

For outdoor tasks, cutting through fibrous materials like sisal rope or thick nylon webbing requires aggressive slicing aggression. Thanks to the vanadium carbides within the steel, the edge exhibits a beautiful "micro-tooth" bite that effortlessly catches and pulls through ropes without snagging.

Maintenance and Touch-Ups

Because CPM-20CV holds its edge for an incredibly long time, you will rarely need to take it to a bench stone. For normal EDC wear, a simple stropping sessions on leather loaded with a diamond compound is more than enough to bring the blade back to a hair-popping edge. While it does take longer to fully re-profile than simpler carbon steels due to its extreme hardness, the trade-off is a blade that stays sharp for months rather than days.

Practical Utility: Tip Strength and Control

One of the common concerns with sheepfoot blades is tip performance. Because the spine curves downward to meet the edge, the tip is naturally positioned lower relative to the centerline of your grip.

On the Penguin Plus, this low-slung tip is an immense asset for precision work. It allows you to place your index finger directly on the jimped spine of the blade, providing absolute control for scoring lines, opening delicate packages without damaging internal contents, or doing detailed carpentry scoring. Additionally, QSP kept the tip robust enough to prevent accidental snapping during heavy downward utility punctures, striking an ideal balance between delicate precision and rugged durability.

The Perfect Match: Premium Configurations

The QSP Penguin Plus collection showcased at EDCMALL pairs this incredible blade with handle architectures engineered to match its premium status.

Whether you opt for the rugged texture of the micarta versions or the premium heft of the titanium frame locks (such as the visually striking QS130XL-F2), the blade steel remains consistent. The premium frame lock variants feature a hardened steel lock bar insert, meaning the lock face interacting with the CPM-20CV tang is solid steel-on-steel, guaranteeing zero lock stick and rock-solid deployment for the lifetime of the knife.

Pros & Performance Highlights

• Elite Wear Resistance: CPM-20CV super-steel holds a razor edge far longer than standard tool steels.

• Superior Stainless Qualities: High chromium content protects the blade against rust, sweat, and moisture.

• Exceptional Utility Geometry: Straight sheepfoot edge maximizes contact and cutting efficiency.

• Ultra-Smooth Deployment: Captive ceramic ball bearing pivot allows the blade to snap open effortlessly via the flipper or thumb studs.

Final Verdict: The Edge-Retention Champion of Its Class

The QSP Penguin Plus with a CPM-20CV blade completely redefines what a premium budget EDC knife can be. QSP did not just scale up the size; they fundamentally elevated the tool's performance thresholds.

If you are a user who demands relentless edge retention, values a blade that can shrug off corrosive environments, and loves the surgical slicing control of a straight sheepfoot profile, this knife is arguably the best value on the modern market. It brings luxury-tier metallurgical performance down to earth, creating a working companion that is built to endure.