Two nickel steels, two different market segments. A detailed comparison for bimetal blade manufacturers and Damascus steel makers.
In the bimetal band saw blade world, nickel steel is the backbone — literally. The backing strip provides fatigue resistance and flexibility while HSS or carbide teeth handle the cutting. Two grades dominate this space: 15N20 and 75Ni8 (EN 1.5634). Both contain approximately 2% nickel and similar carbon levels, yet they serve distinctly different market segments.
75Ni8 is the workhorse backing steel for standard bimetal blades. 15N20 is the premium choice for ultra-wide blades and carries a second life as the most popular Damascus steel component. This article provides a data-driven comparison so you can choose the right grade for your application and budget.
At first glance, these two steels look nearly identical on paper. The differences are subtle but consequential in production.
| Element | 15N20 | 75Ni8 |
|---|---|---|
| Carbon (C) | 0.73–0.78% | 0.72–0.78% |
| Nickel (Ni) | 1.80–2.10% | 1.80–2.10% |
| Manganese (Mn) | 0.30–0.50% | 0.30–0.50% |
| Silicon (Si) | 0.15–0.30% | 0.10–0.30% |
| Chromium (Cr) | ≤0.20% | ≤0.20% |
| Phosphorus (P) | ≤0.025% | ≤0.025% |
| Sulfur (S) | ≤0.015% | ≤0.020% |
The compositions overlap significantly. The real differences emerge in production standards and heat treatment response. 15N20 is manufactured to tighter purity controls (note the lower sulfur limit: 0.015% vs 0.020%), which contributes to its superior fatigue behavior in wide-blade applications and cleaner forge-welding in Damascus work.
This is where the two steels diverge most clearly.
| Property | 15N20 | 75Ni8 |
|---|---|---|
| Working HRC Range | 46–62 | 44–52 |
| Typical Bimetal Backing HRC | 46–50 | 44–50 |
| Peak Achievable HRC | 62 | 52 |
| Hardness Consistency | ±0.5 HRC | ±0.8 HRC |
15N20 has a dramatically wider hardness range. When tempered low for Damascus knives or specialty cutting tools, it can reach HRC 62 — territory normally reserved for tool steels. When tempered for bimetal backing, it sits in the same 46–50 HRC range as 75Ni8 but with tighter consistency.
75Ni8 operates within a narrower, more predictable band. Its HRC 44–52 range is precisely what standard bimetal band saw blades require — tough enough to resist fatigue cracking, soft enough to absorb vibration without fracture.
15N20's ability to reach HRC 62 makes it uniquely versatile. At high hardness, it serves as a premium cutting steel in its own right. At lower hardness, it functions as backing steel. This dual capability is why knifemakers and specialty blade manufacturers value 15N20 — they can use one steel for multiple product lines.
75Ni8 is purpose-built for the HRC 44–52 backing role. It does this job well and cost-effectively, but it cannot be repurposed for high-hardness applications.
For bimetal blades wider than 150 mm (6 inches), fatigue resistance becomes the dominant engineering concern. The blade back endures enormous cyclic stress as it flexes around band wheels. 15N20's tighter purity controls and lower sulfur content translate to fewer non-metallic inclusions — the microscopic weak points where fatigue cracks initiate.
For blades in the 1–4 inch range, 75Ni8 provides entirely adequate fatigue life. The premium of 15N20 is difficult to justify in this size range unless the end application demands extreme reliability (e.g., 24/7 structural steel cutting).
15N20 has become the universal bright-layer steel in Damascus pattern welding. Its ~2% nickel content resists ferric chloride etching, creating the bright lines that contrast with high-carbon steels like 1095 or 1080. Combined with excellent forge-welding behavior and consistent layer bonding, 15N20 is irreplaceable in this role.
75Ni8 can technically be forge-welded, but it is not produced or marketed for Damascus work. Knifemakers specifically seek out 15N20 strip for this purpose, and it commands a significant price premium in that market.
75Ni8 is the volume product. It is produced in large quantities for the global bimetal blade industry, available in a wide range of thin gauges (0.4–1.2 mm), and competitively priced. For standard bimetal blade production, 75Ni8 delivers the best value per kilogram.
15N20 commands a 20–35% premium over 75Ni8 due to tighter production controls and smaller batch sizes. Availability in thin gauges varies by supplier. For high-volume standard bimetal production, this premium is hard to justify unless the blade specifications demand it.
| Property | 15N20 | 75Ni8 |
|---|---|---|
| Nickel Content | 1.80–2.10% | 1.80–2.10% |
| Working HRC | 46–62 | 44–52 |
| Weldability to HSS | Excellent | Excellent |
| Fatigue Life (standard width) | Very Good | Good |
| Fatigue Life (ultra-wide 6–12") | Excellent | Adequate |
| Damascus Suitability | Industry standard | Not used |
| Thin Gauge Availability | Limited | Wide range |
| Relative Material Cost | 1.20–1.35x | Baseline (1.0x) |
| Best Application | Ultra-wide bimetal, Damascus, premium blades | Standard bimetal backing |
For wood-cutting band saw blades (not bimetal), neither 15N20 nor 75Ni8 is the right choice. Use 75Cr1 for standard wood cutting or SK85 for hardwood applications requiring maximum tooth hardness. For high-strength structural applications, 42CrMo4 offers a different alloy approach. See our complete steel selection guide for a full comparison across all grades.
75Ni8 and 15N20 are both excellent nickel steels, but they occupy different niches. 75Ni8 is the right default choice for any manufacturer producing standard bimetal band saw blades — it delivers reliable fatigue performance, excellent weldability, and competitive pricing across a full range of thin gauges.
15N20 is the premium upgrade for manufacturers who need ultra-wide blade capability, maximum fatigue life, or who want to serve the Damascus/knifemaking market with the same steel inventory. The 20–35% price premium is justified when the application demands it.
For a broader overview of all band saw blade steel grades and how to choose by application, read our Band Saw Blade Steel Selection Guide. Need help selecting the right TPI for your blade? Try our TPI Calculator.