Ice and Flame – Hand Forged 1065 Carbon Steel Katana Sword

Ice and Flame – Hand Forged 1065 Carbon Steel Katana Sword

The 烤金 (kao jin) flame-temper finish applied to this 1065 blade is not a coating or a spray – it is a heat-bluing process applied directly to the steel surface, producing the gradient of blue, gold, and amber tones that give Ice and Flame – 冰焰之剑 – its name. It is also a working katana. Both things are true simultaneously, and the blade does not apologize for either.

Specifications

What the Steel Does

The base steel is 1065 high carbon – oil quenched and tempered to a working hardness in the Rockwell C 58-60 range. That is the functional foundation: enough carbon to hold a sharp, durable edge, enough residual ductility after oil quench to survive the stress of impact without becoming brittle. The Shinogi-Zukuri (ridgeline) geometry reinforces this – the defined ridge along the blade face reduces drag during a cut and keeps the spine stiff under load, while the progressive taper toward the tip maintains point control throughout the full arc of a strike.

The 烤金 finish is applied after final grinding and before assembly. Controlled heat is introduced to the blade surface in a gradient – the colors that appear (straw yellow, bronze, blue, deep violet) are interference colors produced by the growth of an oxide layer at different temperatures. The finish is not uniform across every blade; the exact gradient depends on the precise heat application during that specific piece’s finishing. What is consistent is the starting geometry and steel spec underneath. The surface color is a feature of the steel itself, not an addition to it, and it provides a mild baseline corrosion resistance compared to bare polished steel.

The Feel of It

In a two-handed grip, the 27 cm cotton ito wrap fills both hands with enough handle to spare – the lower hand seats at the kashira (pommel), the upper hand rests behind the tsuba (hand guard), and the textured diamond wrap pattern gives confident purchase without requiring a tight grip. The Aohada saya produces a clean, resistance-free draw; the blade unseats smoothly and the koiguchi (saya mouth fitting) holds the blade secure at rest without any lateral movement. The 72 cm blade length puts the tip at a distance that rewards committed, full-body cutting mechanics.

Keeping It Sharp

The 烤金 surface will show wear at the edge and high-contact points over time – this is normal and does not affect steel performance. Wipe the blade after each session with a clean, dry cloth and apply a light coat of choji or mineral oil to prevent oxidation on the bare metal at the edge. Sharpen with water stones rather than abrasive belt systems, which will remove the surface finish aggressively; keep sharpening to the edge geometry only and preserve the blade face where possible.