1045 steel is not a great choice for most knives. With a carbon content of 0.42% to 0.50%, it falls in the medium-carbon range, which means it can be hardened but won’t hold an edge nearly as well as steels specifically designed for knife blades. It has real strengths, but edge retention isn’t one of them.
What’s in 1045 Steel
1045 is a plain carbon steel, meaning it contains almost no alloying elements beyond carbon and a small amount of manganese (0.60% to 0.90%). The rest, roughly 98.5% to 99%, is iron. That simplicity is part of its appeal in industrial settings: it’s affordable, widely available, and predictable to work with. But for knife performance, the lack of chromium, vanadium, or other elements that improve wear resistance and corrosion resistance is a real limitation.
In its annealed (unhardened) state, 1045 steel typically sits around 22 HRC on the Rockwell hardness scale. That’s far too soft for a knife blade. Heat treatment can push it higher, but even after quenching and tempering, it won’t reach the 58 to 62 HRC range that most dedicated knife steels achieve.
Where 1045 Falls Short for Knives
The core problem is edge retention. A knife made from 1045 steel will dull noticeably faster than one made from higher-carbon steels like 1075, 1084, or 1095. If you’re using a knife for regular cutting tasks, whether in the kitchen, at a campsite, or in a workshop, you’ll be sharpening it significantly more often. For a tool whose primary job is to cut, that’s a meaningful drawback.
1045 also has no corrosion resistance to speak of. As a plain carbon steel with no chromium, it will rust quickly if exposed to moisture and not dried promptly. Any carbon steel knife requires maintenance, but higher-performing options like 1095 or 80CrV2 at least justify that maintenance with better cutting performance.
Where 1045 Actually Works
1045’s real advantage is toughness. Its lower carbon content makes it more resistant to chipping and snapping under impact than harder, more brittle steels. This is why it’s commonly used for swords, machetes, and large chopping blades where the blade absorbs significant shock. In the sword world, 1045 is a standard choice for practice weapons, martial arts kata, light cutting exercises on soft targets like tatami mats, and display pieces.
If you need a large blade that prioritizes surviving impacts over holding a razor edge, 1045 is a reasonable budget option. Think along the lines of a camp machete you’ll sharpen in the field, not a kitchen knife or a bushcraft blade you expect to perform precise cuts.
1045 vs. 1095 for Knives
The comparison with 1095 steel highlights exactly where 1045 falls short. 1095 has a carbon content near 0.95%, almost double that of 1045. This translates directly into superior hardness, a sharper achievable edge, and significantly better edge retention. For any knife where cutting performance matters, 1095 is the clear winner.
The tradeoff is that 1095 is more brittle. At high hardness, it’s less tolerant of abuse and can chip if used as a pry bar or struck against hard objects. But for actual knife use, meaning slicing, carving, and controlled cutting, that brittleness rarely becomes a problem with proper technique. 1095 is one of the most popular steels among knifemakers for good reason.
Ease of Working for Beginners
One argument in favor of 1045 is that it’s easy to work with. It grinds and shapes readily, responds well to heat treatment, and is forgiving during the quenching process. It can be quenched in oil, brine, or even water, giving beginners more flexibility. Higher-carbon steels are more sensitive to heat treatment mistakes and more prone to cracking during quenching.
For someone learning knifemaking as a hobby, 1045 can serve as inexpensive practice material. You can learn grinding, profiling, heat treating, and handle fitting without worrying about ruining costly steel. But the finished knife won’t perform like one made from a steel better suited to the job. If you’re a beginner looking for a steel that’s both forgiving to work and produces a functional knife, 1075 or 1084 are better starting points. They offer substantially better edge retention while remaining relatively easy to heat treat.
Better Steel Options for Knives
If you’re choosing a carbon steel for a knife, several options outperform 1045 without dramatically increasing cost or difficulty:
- 1075: A good balance of toughness and edge holding. Popular for large knives and choppers where you want both impact resistance and decent cutting ability.
- 1084: Widely recommended as the best beginner knifemaking steel. Simple heat treatment, good edge retention, and widely available.
- 1095: The standard high-carbon knife steel. Excellent edge retention and sharpness, with the understanding that it’s slightly more brittle and less forgiving during heat treatment.
- 80CrV2: Adds small amounts of chromium and vanadium to a high-carbon base, improving both toughness and wear resistance. A favorite among custom knifemakers.
All of these steels will rust without care, just like 1045. But they’ll reward that care with meaningfully better performance where it counts: at the cutting edge. If corrosion resistance is a priority, you’d want to move into stainless territory entirely, which is a different conversation.
The Bottom Line on 1045 for Knives
1045 steel can technically be made into a knife, and it will cut. But it sits in an awkward spot for blade use: not hard enough to hold an edge well, not alloyed enough to resist corrosion, and only advantageous in toughness, a property that matters more for large impact tools than for knives. For machetes, practice swords, and beginner blacksmithing projects it fills a real niche. For a knife you plan to use seriously, you’re better served by steels with higher carbon content that were designed with cutting edges in mind.