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    • Carpenter CTS-204P

    CTS-204P Knives: Carpenter Technology's High-Edge-Retention PM Stainless Steel

    CTS-204P is a powder metallurgy stainless steel produced by Carpenter Technology in Reading, Pennsylvania. Its composition — approximately 1.9% carbon, 20% chromium, 4% vanadium, 1% molybdenum, and 0.6% tungsten — is essentially identical to Bohler M390 and Crucible 20CV. All three are produced from near-identical alloy chemistries by different mills, and all three deliver the same hallmark performance: exceptional edge retention, very good corrosion resistance, and a sharpening challenge that demands quality diamond or CBN abrasives.

    At Knifeworks, you are buying from an authorized dealer: every CTS-204P knife on this page ships with full manufacturer warranty coverage — Benchmade LifeSharp (free lifetime sharpening and mechanical repair) and Spyderco's manufacturer warranty. No gray-market sourcing, no voided warranties.

    CTS-204P appears most frequently in Spyderco sprint runs and limited production models, and in select Benchmade production and custom shop offerings. When you see it in a Spyderco, it is the same high-performing steel you find in M390 or 20CV models — the Carpenter mill designation is the only meaningful difference. The steel holds an acute edge through extended cutting tasks, resists corrosion well in everyday carry conditions, and takes longer to restore at the bench than mid-grade stainless steels.

    CTS-204P, 20CV, and M390: the same steel from three millsCarpenter Technology (CTS-204P), Crucible Industries (20CV), and Bohler (M390) all produce steel from near-identical alloy specifications. Minor mill-to-mill variation in powder particle size and processing can produce subtle differences in heat treat response, but for the end user the edge retention, toughness, and corrosion resistance are functionally interchangeable. When comparing models, the brand and heat treat matter more than which mill supplied the bar stock.

    Call 888-225-9775 — our team can help you choose the right CTS-204P model.

    Steel type
    PM Stainless
    Produced by
    Carpenter Technology
    Typical hardness
    60–62 HRC
    Edge Retention
    Excellent
    Corrosion resist.
    Very Good
    Sister steels
    M390 / 20CV
    Compare Selected

    CTS-204P Steel: Frequently Asked Questions

    What is CTS-204P steel and who makes it?＋

    CTS-204P is a powder metallurgy stainless steel produced by Carpenter Technology, headquartered in Reading, Pennsylvania. Carpenter is one of the major specialty alloy producers in the United States, and CTS-204P is their premium knife blade steel — a high-carbon, high-chromium, high-vanadium alloy with approximately 1.9% carbon, 20% chromium, 4% vanadium, 1% molybdenum, and 0.6% tungsten.

    CTS-204P is essentially the same steel as Bohler M390 and Crucible 20CV. All three share near-identical alloy chemistry and are produced via the powder metallurgy process that gives them their fine, uniform carbide structure. The CTS-204P designation is Carpenter's trade name for this alloy; the steel itself performs identically to M390 and 20CV at the same hardness under the same heat treat.

    What is the difference between CTS-204P, M390, and 20CV?＋

    CTS-204P (Carpenter Technology), M390 (Bohler), and 20CV (Crucible Industries) are three trade names for near-identical steel compositions. The alloy chemistry is essentially the same across all three — same carbon, chromium, vanadium, molybdenum, and tungsten targets — and all three are produced via powder metallurgy for a fine, uniform carbide structure.

    Minor mill-to-mill variation exists in powder particle size, hot isostatic pressing parameters, and downstream processing, which can produce subtle differences in how each steel responds to a specific maker's heat treat. In practice, most buyers and many knife makers treat them as interchangeable. Spyderco uses all three across their lineup depending on availability and procurement. For buyers, the knife brand, model geometry, and grind thickness matter far more than which mill name appears on the steel.

    Trade NameMillCountry
    CTS-204PCarpenter TechnologyUSA
    20CVCrucible IndustriesUSA
    M390BohlerAustria
    How does CTS-204P compare to CPM MagnaCut?＋

    CPM MagnaCut matches or exceeds CTS-204P on edge retention at the same hardness and dramatically outperforms it on toughness. CTS-204P at 62 HRC is more brittle than CPM MagnaCut at 64 HRC — the chromium carbide structure that gives CTS-204P its wear resistance also creates potential initiation points for micro-chipping under lateral stress. CPM MagnaCut uses niobium and vanadium carbides instead, which are harder and smaller, keeping the matrix intact at higher hardness.

    CPM MagnaCut also has superior corrosion resistance. CTS-204P's 20% chromium is partially tied up in carbides, reducing the free chromium available for rust protection. CPM MagnaCut has no chromium carbides, so all chromium works in the matrix. For most buyers today, CPM MagnaCut is the stronger all-around choice. CTS-204P remains an excellent option for collectors and buyers who specifically seek out Spyderco sprint runs or Benchmade custom shop offerings in this steel.

    How does CTS-204P compare to CPM-S35VN?＋

    CTS-204P significantly outperforms CPM-S35VN on edge retention — laboratory CATRA testing puts high-vanadium PM steels like CTS-204P well above CPM-S35VN in total edge life. The tradeoffs are toughness and sharpenability. CPM-S35VN is notably tougher than CTS-204P at comparable hardness and is considerably easier to restore at the bench. CPM-S35VN sharpens on standard diamond stones and ceramic rods; CTS-204P demands quality diamond or CBN abrasives and more time.

    For hard use, outdoor tasks, or buyers who sharpen frequently with basic tools, CPM-S35VN is the more practical choice. For precision EDC cutting where maximizing edge life is the priority and the owner sharpens with quality equipment, CTS-204P has the clear advantage.

    Is CTS-204P hard to sharpen?＋

    Yes — CTS-204P is one of the more demanding blade steels to sharpen at home. Its high vanadium and chromium carbide content resists abrasion from standard aluminum oxide whetstones and most ceramic rods. Diamond abrasives or CBN stones are the recommended choice at 60–62 HRC. With the right abrasives, CTS-204P sharpens predictably and takes a very refined edge, but it takes meaningfully more time and effort than CPM-S35VN or 154CM.

    For field touch-ups, a fine diamond card works reasonably well. For full re-profiling, plan for a quality diamond bench stone and patience. If you own a Spyderco with a Benchmade LifeSharp-eligible knife, Benchmade's free sharpening service handles CTS-204P professionally — worth factoring in when comparing total cost of ownership.

    Does CTS-204P rust or stain easily?＋

    CTS-204P has very good corrosion resistance — significantly better than tool steels like D2 and comparable to CPM-S35VN in everyday carry. Its 20% chromium content provides strong protection against sweat, humidity, and mild food acids. However, because a portion of that chromium is locked in carbides rather than free in the matrix, its corrosion resistance is slightly below CPM MagnaCut under the same conditions.

    In practical EDC use, CTS-204P will not rust under normal conditions. Wipe the blade after extended saltwater or acidic food exposure, keep the pivot lubricated, and the steel will stay clean through years of carry.

    What brands use CTS-204P steel?＋

    Spyderco and Benchmade are the primary production brands that use CTS-204P. Spyderco incorporates it in sprint runs and limited production models across their Para and Military lines. Benchmade has used CTS-204P in custom shop and Gold Class offerings. Knifeworks carries authorized stock from both with full manufacturer warranty coverage.

    BrandNotable CTS-204P ModelsWarranty
    SpydercoPara 3, Paramilitary 2, Manix 2 sprint runsManufacturer limited warranty
    BenchmadeCustom Shop and Gold Class modelsLifeSharp — free lifetime sharpening & repair
    Which CTS-204P knife should I buy at Knifeworks?＋

    CTS-204P most commonly appears in Spyderco sprint runs — limited production releases that sell through quickly and do not return to the lineup. If a Spyderco CTS-204P model is in stock, it is worth acting on: sprint runs in this steel have a strong secondary market value and represent the best opportunity to own a flagship Spyderco geometry in a top-tier blade steel at production pricing.

    If you are deciding between CTS-204P and CPM MagnaCut in a current production model, CPM MagnaCut is the more advanced steel. If you are comparing CTS-204P to M390 or 20CV in comparable models, performance will be functionally identical — choose based on model, price, and availability. Call 888-225-9775 and our team can walk you through what is currently in stock.

    CTS-204P vs. comparable blade steels

    SteelToughnessEdge RetentionCorrosion ResistanceSharpenability
    CTS-204P ★ModerateExcellentVery goodDifficult
    M390ModerateExcellentVery goodDifficult
    20CVModerateExcellentVery goodDifficult
    CPM MagnaCutExceptionalHighExcellentModerate
    CPM-S35VNHighModerateHighEasy
    CPM-S30VMod–HighModerateHighModerate
    154CMMod–HighModerateAbove avgVery easy
    CTS-204P, M390, and 20CV: identical ratings, different mill namesAll three appear in the table with identical ratings because they are the same steel. If you are comparing a Spyderco CTS-204P sprint to a Benchmade M390 Gold Class, the steel is not the variable — the knife geometry, lock type, handle material, and heat treat are.
    ⚔
    Benchmade & Spyderco Sprint RunsAuthorized CTS-204P catalog including Spyderco limited sprint runs and Benchmade Gold Class — the models that move fast and rarely restock.
    Authorized Dealer — Full Warranty CoverageBenchmade LifeSharp: free lifetime sharpening and mechanical repair. Spyderco manufacturer warranty on every knife sold.
    CTS-204P vs. CPM MagnaCutDeciding between the two? Call 888-225-9775 — our team can tell you which steel makes more sense for your use case and what is currently in stock.
    Same or Next Business Day ShippingShips from Columbia, Louisiana. Order by 2 PM CT and your CTS-204P knife is on its way today.