How Were Viking Swords Made? Iron, Steel, Pattern Welding and the Ulfberht Exception
A Viking sword was the most expensive object most Norse warriors would ever hold, and the reason is in how it was made. Iron had to be smelted from bog ore in a clay furnace, refined by hand, forge-welded into a blade in a pattern the smith could barely see, then hardened, tempered and polished over weeks. This guide covers what the blades were actually made of, the forging process step by step, the crucible-steel exception that made the Ulfberht famous, and what that history means for the steel in a modern reproduction.
What Viking swords were made of
Iron and steel together, and the combination was the point. Norse smiths worked bloomery iron, smelted from bog ore in small clay-shaft furnaces at temperatures too low to melt it. The bloom that came out was a spongy mass of iron and slag that had to be hammered and folded repeatedly to drive the slag out. Pure wrought iron like that is tough but soft: it bends rather than breaks, and it will not hold an edge. Steel, iron with enough carbon to harden, was scarce and expensive, produced in small amounts by carburising iron in charcoal for days. So the smith put the two where each belonged: a core of iron or low-carbon steel for toughness, and edges of harder steel forge-welded on to take the sharpening.
Four properties decide how a blade behaves, and the iron-and-steel construction balanced them. Hardness, which lets an edge stay sharp. Flexibility, which lets a blade bend under load and return. Toughness, which resists cracking. And corrosion resistance, which the Norse had none of, so blades were kept oiled, wrapped in oiled wool inside the scabbard, and rubbed with animal fat.
Pattern welding
The characteristic Viking technique, inherited from the Migration period, was pattern welding. Rods of iron and steel were stacked, twisted, forge-welded into a single bar, and that bar became the core of the blade, with plain steel edges welded along both sides. When the finished blade was polished and etched, the twisted layers showed as herringbone, star, wave or serpent patterns running down the fuller. The patterns were decorative, but they were also a mark of a smith who knew what he was doing, because a badly welded core would come apart at the seams. Pattern welding faded through the 9th and 10th centuries as better homogeneous steel became available and smiths could make a whole blade from one bar.
The Ulfberht exception: crucible steel
The blades inlaid +VLFBERH+T, made in the Frankish Rhineland between roughly 800 and 1000, are the exception to everything above. The best of them were forged from crucible steel, made by melting iron with carbon in a sealed clay crucible until it became a homogeneous, nearly slag-free high carbon steel. Europe could not make steel like that again until the 18th century. The likeliest source is Central Asia, with the ingots travelling to the Rhineland along the Volga trade routes the Norse themselves ran. About 170 Ulfberht blades survive, most of them in Scandinavia, and analysis shows a clear split: a minority in true crucible steel, and a majority of period counterfeits in ordinary pattern-welded iron, often with the inscription misspelled or the crosses misplaced. The Ulfberht guide covers the steel and the fakes in depth.
How a Viking sword was forged, step by step
1. Smelting. Bog ore was roasted and smelted with charcoal in a clay furnace, yielding a bloom of iron and slag.
2. Refining. The bloom was reheated and hammered, folded and welded until the slag was worked out and the iron was consistent enough to use.
3. Carburising. Bars intended for edges were packed in charcoal and held at heat for days so carbon soaked into the surface, turning iron into steel.
4. Pattern welding. Iron and steel rods were twisted, stacked and forge-welded into the core bar.
5. Forging the blade. Steel edge bars were welded to the core and the whole was drawn out to length and profile under the hammer, with the tang formed at the same time.
6. Fullering. The central groove was forged or ground in. The fuller removes roughly a third of the weight a flat blade of the same size would carry without weakening it, which is why a 35 inch sword could weigh under three pounds.
7. Quenching. The blade was heated to a critical temperature, judged by colour, and plunged into water or oil to harden the steel.
8. Tempering. The hardened blade was reheated gently to take the brittleness out, leaving an edge that held and a body that flexed.
9. Grinding and polishing. The blade was ground to its edge, polished with stones of increasing fineness, and etched to bring up the pattern.
10. Hilting. Guard and pommel were fitted over the tang, which was peened over to hold them; grips of wood, bone, horn or antler were wrapped in leather or wire, and rich swords had silver or copper inlay in the fittings.
The sword types, by era
Migration period swords (5th to 8th century) descend from the Roman spatha and are the ancestor of the type. The Carolingian sword (8th to 10th century) is the Frankish form with the short guard and lobed pommel that the Norse adopted wholesale. Petersen Type H (9th to 10th century) is the commonest Viking sword found, with a three-lobed pommel; Type S (10th century) carries the elaborate five-lobed decorated hilt; Type X (late 10th to 11th century), with its plain guard and broad fullered blade, is the bridge to the knightly arming sword. The Ulfberht blades span the 9th to 11th centuries and appear in several hilt types. The famous Viking swords article covers the types and the great finds.
What the sword meant
A sword cost about what a farm cost, which is why most warriors carried a spear and an axe and the sword was the weapon of chieftains, professional retainers and men who had inherited one. Swords were named, passed down as heirlooms, given by kings to bind loyalty, buried with their owners and thrown into rivers as offerings. To lose one was a disgrace. The inscriptions on blades were mostly Latin-letter smith marks such as VLFBERHT and INGELRII inlaid in the steel; runes on blades are rare. The lobed pommel was not only decoration but a counterweight that pulled the balance back toward the hand.
Modern steels for a Viking sword reproduction
No modern maker smelts bog ore, and a good reproduction uses steels that outperform anything the Norse had. 1060, 1075 and 1095 high carbon steels are the standard monosteels; 1095 carries about 0.95 percent carbon and typically finishes around 56 to 58 HRC. Pattern-welded Damascus, layers of high carbon steel forge-welded and folded so the pattern runs through the blade, is the direct descendant of Viking pattern welding and the closest modern blade to what the originals looked like. It is not the same as wootz, the Indian and Persian crucible steel that gave Damascus its name, and it is not what the Vikings themselves called anything. Spring steels such as EN45 are used for some reenactment blades. Stainless steel resists rust but is brittle at sword length and belongs on display pieces only. Our Damascus and 1095 Viking swords are hand forged, and the steel, hardness and construction are stated on each listing in the Viking swords collection; the buying guide explains what to check.
Caring for a high carbon Viking sword
Every steel above except stainless will rust if neglected, exactly as the originals did. Wipe the blade after handling, oil it lightly, and store it dry, in the scabbard or on a mount. Inspect the guard and pommel for play a couple of times a year. Kept that way a hand-forged blade lasts for generations, which is, after all, how the originals reached us.
Frequently asked questions
What metal were Viking swords made from?
A core of wrought iron or low-carbon steel with harder steel edges forge-welded on, often pattern-welded from twisted rods. A small number of elite blades, the true Ulfberhts, were made from imported crucible steel.
Did Vikings use Damascus steel?
No. They pattern-welded iron and steel, which produces a similar surface pattern. Wootz, the crucible steel behind the original Damascus name, reached a few Frankish workshops but was not a Norse technique. Modern Damascus means forge-welded layered high carbon steel.
Did Vikings use iron or steel?
Both, in the same blade. Iron for the core, steel for the edges.
What is the best steel for a Viking sword replica?
1060, 1075 or 1095 high carbon, or pattern-welded Damascus made from those steels. Stainless is for display only.
How long and heavy was a Viking sword?
Historically 90 to 95 cm overall with a 70 to 90 cm blade, weighing 1 to 1.5 kg. Reproductions run 28 to 38 inches overall and roughly 2 to 3 lb.
Were Viking sword inscriptions runic?
Mostly not. Blade inscriptions are Latin-letter smith marks inlaid in the steel. Runes appear on a few hilts and one famous blade, the Sæbø sword.
How did Vikings stop their swords rusting?
Oil and animal fat on the blade, and scabbards lined with oiled wool or sheepskin.
About the author
Owen Juarbal is Director of Marketing and head writer at Battling Blades. He has been with the company since 2021 and writes or reviews every guide the team publishes. Read more about Battling Blades.
