Californian San Mai S290 Microclean Billet – Cryo Treated Core Steel
$360.00
Premium handcrafted Californian San Mai billet featuring a Böhler S290 Microclean core hardened to 65–66 HRC, stainless 440B outer layers, and nickel interlayers for enhanced toughness and visual contrast. Double cryo-treated in liquid nitrogen for maximum wear resistance, edge retention, and cutting performance.
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Californian San Mai S290 Microclean
Experience one of the most advanced high-performance San Mai steels available today.
This exclusive laminated billet combines an ultra-hard Böhler S290 Microclean core with durable stainless 440B outer layers and nickel interlayers, creating a premium balance of extreme edge retention, toughness, corrosion resistance, and stunning visual appearance.
The central cutting core is heat treated to 65–66 HRC, while the steel itself is capable of reaching up to 69–70 HRC, delivering exceptional wear resistance and aggressive cutting performance for high-end custom knives.
Each billet undergoes a specialized two-stage cryogenic treatment in liquid nitrogen, improving carbide structure, hardness stability, and long-term edge performance.
Construction
- Outer Layers: 440B Stainless Steel — 60–61 HRC
- Intermediate Layer: Nickel (Ni)
- Core Steel: Böhler S290 Microclean — 65–66 HRC
Key Features
- Extremely high wear resistance
- Outstanding edge retention
- Premium laminated San Mai construction
- Double cryogenic treatment
- Excellent cutting aggression
- Ideal for high-end custom knife making
Chemical Composition of S290 Microclean
- Carbon (C): 2.0%
- Tungsten (W): 14.3%
- Vanadium (V): 5.1%
- Cobalt (Co): 11%
- Molybdenum (Mo): 2.5%
- Chromium (Cr): 3.8%
- Silicon (Si): 0.5%
- Manganese (Mn): 0.3%
Perfect for makers seeking a truly elite steel combination with maximum cutting performance and exclusivity.
Shipping & Guarantee
We ship orders from Los Angeles, California across the United States and internationally.
• Free shipping in the USA on orders over $ 300
• Flat shipping to Canada — $ 30
• Orders in stock ship within 24 hours
• Average delivery time in the USA — about 5 business days
Backorders:
Some products may be temporarily out of stock.
If an item is marked Backorder, the estimated waiting time is:
30–45 days. This includes production and international logistics.
You will receive an email notification once your order has shipped..
Returns:
We accept returns within 15 days after delivery. To qualify for a return:
• The product must be unused
• The item must be in original packaging
• All components must be included
Please contact us before sending any item back.
Email: ask@usa-market.net
Damaged or Incorrect Orders:
• If you receive a damaged or incorrect product:
• Take photos of the item
• Send them to ask@usa-market.net
Include your order number. We will review your case and offer:
Replacement / Refund / Store credit
• Free shipping in the USA on orders over $ 300
• Flat shipping to Canada — $ 30
• Orders in stock ship within 24 hours
• Average delivery time in the USA — about 5 business days
Backorders:
Some products may be temporarily out of stock.
If an item is marked Backorder, the estimated waiting time is:
30–45 days. This includes production and international logistics.
You will receive an email notification once your order has shipped..
Returns:
We accept returns within 15 days after delivery. To qualify for a return:
• The product must be unused
• The item must be in original packaging
• All components must be included
Please contact us before sending any item back.
Email: ask@usa-market.net
Damaged or Incorrect Orders:
• If you receive a damaged or incorrect product:
• Take photos of the item
• Send them to ask@usa-market.net
Include your order number. We will review your case and offer:
Replacement / Refund / Store credit
