CPM MagnaCut outperforms S45VN in toughness and corrosion resistance, making it the superior choice for hard-use and marine environments. S45VN offers a marginal edge-retention advantage — approximately 140% vs. 135% of a 440C baseline per CATRA testing (Knife Steel Nerds, 2021) — and remains the more cost-efficient option for high-volume EDC production. MagnaCut’s elimination of large chromium carbides gives it tool-steel toughness in a stainless package, a combination S45VN cannot match.

Quick Decision Guide

• Choose CPM S45VN if you need proven production efficiency, maximum slicing aggression for EDC folders, and a $120–$180 MSRP price point.
• Choose CPM MagnaCut if you need maximum toughness for hard-use or marine applications, or are building a flagship product above $200 MSRP.

Steel Overview: S45VN & MagnaCut

CPM S45VN

Released by Crucible Industries in 2019, S45VN is the direct successor to the legendary S35VN. By balancing chemistry with nitrogen, Crucible created a steel that improves on S35VN’s corrosion resistance and edge retention while remaining factory-friendly. Full technical specs are available in the official Crucible S45VN datasheet (PDF).

It is currently the “Gold Standard” for high-volume premium folding knives, featured in flagship models from Spyderco (Para Military 2) and Chris Reeve Knives (Sebenza 31).

CPM MagnaCut

Launched in 2021 and designed by metallurgist Larrin Thomas, MagnaCut was engineered to solve the “toughness tax” of stainless steel. The full technical breakdown is covered in Thomas’s original article “CPM MagnaCut – The Next Breakthrough in Knife Steel” on Knife Steel Nerds. By eliminating large chromium carbides and replacing them with niobium carbides, it achieves tool-steel toughness while remaining nearly rust-proof.

As of 2025–2026, supply chains have substantially stabilized — Benchmade, Tactile Knife Co., and numerous boutique makers now offer MagnaCut production models, though raw material costs remain higher than the S30V/S45VN family.

Chemical Composition Comparison

Element	CPM S45VN	CPM MagnaCut	Manufacturer Interpretation
Carbon (C)	1.48%	1.15%	Higher C → more carbides → more wear resistance in S45VN
Chromium (Cr)	16.00%	10.70%	S45VN ties up Cr in carbides; MagnaCut keeps Cr ‘in solution’ for better corrosion protection
Vanadium (V)	3.00%	4.00%	More V in MagnaCut → finer grain, easier sharpening
Molybdenum (Mo)	2.00%	2.00%	Equal — both benefit from Mo for hardenability
Niobium (Nb)	0.50%	2.00%	Higher Nb in MagnaCut replaces some Cr carbides → key to toughness gain
Nitrogen (N)	0.15%	0.20%	MagnaCut’s extra N boosts corrosion resistance in solution

Source: Zknives.com

Chromium Efficiency is the key metric. S45VN relies on high Cr (16%) for stain resistance, but much of it is locked in carbides and not available to protect the matrix. MagnaCut uses lower total Cr (10.7%) but keeps nearly all of it “in solution.” This is why MagnaCut is technically more corrosion-resistant despite lower total chromium content — a phenomenon confirmed by Larrin Thomas’s original MagnaCut testing.

Performance Comparison

Performance	CPM S45VN	CPM MagnaCut	Winner	Key Data Point
Edge Retention	6.0 / 10 ★★★★	5.0 / 10 ★★★	S45VN	140% vs 135% of 440C baseline (Crucible CATRA datasheet)
Toughness	4.5 / 10 ★★★	7.0 / 10 ★★★★★	MagnaCut	38 ft-lbs vs 19 ft-lbs at HRC 62.5/61.5 (Crucible datasheet)
Corrosion Resistance	8.0 / 10 ★★★★	9.5 / 10 ★★★★★	MagnaCut	Near LC200N levels; saltwater-grade
Ease of Sharpening	6.0 / 10 ★★★★	7.0 / 10 ★★★★★	MagnaCut	Fine vanadium carbides, minimal burr
Machinability / BOM	High	Medium	S45VN	S45VN easier to grind; lower raw-material cost

Data source: Crucible official MagnaCut datasheet (CATRA + Charpy testing) | S45VN analysis — Knife Steel Nerds

Detailed Performance Analysis

1. Edge Retention & Cutting Feel

S45VN wins on pure abrasive wear resistance. According to the Crucible MagnaCut official datasheet, CATRA testing places S45VN at 140% of a 440C baseline versus MagnaCut’s 135% — a 5-point gap that most users cannot detect in real-world cutting tasks. The practical difference is in cutting character: S45VN’s larger chromium carbides create a “toothy” edge that grabs synthetic materials aggressively, while MagnaCut’s finer vanadium and niobium carbides produce a smoother, “razor-like” cut that many enthusiasts find easier to strop back to sharpness.

Production Note: S45VN performs well at standard sharpening angles (20° per side). MagnaCut delivers its best performance ground thinner (15°–17°), which requires tighter CNC grinding tolerances but unlocks superior cutting efficiency.

2. Toughness — The Main Differentiator

This is the most significant performance gap between the two steels. According to the Crucible official MagnaCut datasheet, Longitudinal Charpy C-Notch testing shows MagnaCut reaching 38 ft-lbs at HRC 62.5, versus S45VN’s 19 ft-lbs at HRC 61.5 — exactly a 2× difference. S45VN, like its predecessor S30V, is prone to micro-chipping when contacting staples, bone, or hardwood. MagnaCut’s elimination of large brittle chromium carbides acts as a structural shock absorber.

Manufacturer’s Note: Using MagnaCut on hard-use models directly reduces warranty claims related to blade breakage. For standard EDC where lateral impact is rare, S45VN’s toughness is perfectly adequate and its lower BOM cost is the better business decision.

3. Corrosion Resistance

S45VN is excellent for 90% of users. The official S45VN datasheet confirms strong stainless performance. However, in prolonged high-salt or acidic environments (fish blood, citrus), it can develop minor pitting (“pepper spots”). MagnaCut, by contrast, performs at near-LC200N levels in Larrin Thomas’s immersion testing making it virtually immune to atmospheric corrosion and a direct competitor to dedicated salt-resistant steels like H1 and LC200N in practical terms.

4. Ease of Sharpening & Finishing

Despite being harder (HRC 63+), MagnaCut is actually easier to sharpen than S45VN. S45VN’s specific vanadium/chromium carbide mix can feel slightly “gummy” on stones, sometimes leaving a stubborn wire burr. MagnaCut’s extremely fine microstructure deburrs cleanly and takes a crisp edge with minimal effort — a direct result of replacing large chromium carbides with finer vanadium and niobium carbides.

Factory Insight: MagnaCut also responds better to bead blasting and stonewashing, yielding a cleaner, more uniform visual finish than S45VN — a relevant consideration for brands competing on aesthetics.

Cost & Market Positioning

CPM S45VN — The “Smart Upgrade” ($120–$180 MSRP)

The safest upgrade path for brands currently using S35VN. Supply chains are mature, heat-treatment protocols are well-established, and BOM costs are lower. Allows brands to market a “Newer, Better Steel” without drastically increasing cost.

CPM MagnaCut — The “Flagship Tier” ($200+ MSRP)

As of 2025–2026, MagnaCut availability has improved significantly, with Crucible ramping production. However, raw material costs remain 30–40% higher than S45VN stock. Best reserved for limited editions or top-tier flagship models where “toughness” and enthusiast credibility are primary selling points and margins can absorb the premium.

Product Strategy: Where to Use Which Steel

Instead of asking “Which steel is better?”, product managers should ask: “How thin is the edge, and how hard will the user hit it?”

Use Case	Recommended	Typical Tasks	Reasoning
Gentleman’s Folder / Thin Slicer	CPM S45VN	Opening boxes, slicing rope, synthetic materials	Higher carbide volume → ‘toothy’ edge; toughness not needed; BOM stays low
Hard-Use Tactical & Fixed Blade	CPM MagnaCut	Survival, prying, chopping, outdoor use	~2× tougher → fewer warranty claims; grind thinner without chipping risk
Marine / Salt Series	CPM MagnaCut	Fishing, coastal carry, wet environments	Near-saltwater-grade corrosion; clear USP for marketing
EDC Folder (standard use)	CPM S45VN	Office carry, light daily tasks	Proven supply chain; $120–$180 MSRP sweet-spot; mature heat-treat protocols
Flagship / Limited Edition	CPM MagnaCut	Brand prestige, boutique lines	‘Best-of-all-worlds’ steel; commands $200+ MSRP; strong enthusiast demand

Final Verdict

• Choose S45VN if you want a scalable, proven premium steel that maximizes profit margins and production efficiency for standard EDC folders.
• Choose MagnaCut if you are building a hard-use, marine, or boutique flagship line where toughness, corrosion resistance, and enthusiast credibility are the primary selling points.

Partner with Keganico: Manufacturing Solutions

Choosing the right steel is about balancing performance with your target MSRP.

At Keganico, we specialize in helping brands navigate these choices.

• For Scalable Production: We have extensive experience manufacturing CPM S45VN. Our heat treatment protocols are optimized to deliver consistent quality for high-volume orders, making it a reliable choice for your core product line.
• For Specialized Needs: Looking for specific properties found in steels like MagnaCut? Our OEM knife manufacturer team can evaluate your design and help you source the most appropriate material for your budget and lead-time requirements.

Planning your 2026 lineup?

Whether you need the production readiness of S45VN for a private label launch or want to discuss custom material options, we are here to help.

Contact Keganico Today for a consultation and quote.

Frequently Asked Questions

Is MagnaCut better than S45VN for everyday carry?

For most EDC tasks (opening boxes, cutting packaging), S45VN is sufficient and more cost-effective. MagnaCut’s advantages are most noticeable in hard-use scenarios or coastal environments. Both steels perform similarly for standard daily tasks, but MagnaCut is the safer long-term investment if users neglect maintenance.

How much tougher is MagnaCut than S45VN?

Per the Crucible official MagnaCut datasheet, Longitudinal Charpy C-Notch testing shows MagnaCut at 38 ft-lbs (HRC 62.5) versus S45VN at 19 ft-lbs (HRC 61.5) — exactly a 2× advantage. This translates directly to fewer micro-chips and tip breaks under lateral or impact stress.

Does S45VN rust?

S45VN has excellent corrosion resistance for a premium stainless steel but can develop minor pitting (“pepper spots”) in prolonged salt or acid exposure. MagnaCut is virtually immune to atmospheric corrosion and performs at near-salt-steel levels, making it significantly more forgiving for users in humid or coastal environments.

Why is MagnaCut more expensive?

MagnaCut uses higher quantities of niobium and vanadium — both more expensive alloying elements than chromium. Raw stock typically costs 30–40% more than S45VN billet. Additionally, its optimal heat treatment is less forgiving, requiring tighter process control and increasing manufacturing overhead per blade.

Which brands use MagnaCut vs S45VN?

Notable S45VN brands: Chris Reeve Knives (Sebenza 31), Spyderco (Para Military 2), Benchmade (various). Notable MagnaCut adopters (2024–2026): Tactile Knife Co. (Rockwall), Benchmade (select models), and numerous custom/boutique makers. The trend is clearly toward MagnaCut for premium and hard-use categories.