D2 / X155CrVMo12-1 vs HS6-5-2-5: 18% composition overlap. Significantly different materials serving different application areas.
D2 / X155CrVMo12-1 vs HS6-5-2-5
Side-by-side chemical composition and mechanical property comparison.
Overview
D2 / X155CrVMo12-1
1.2379
Premium high-carbon high-chromium cold-work tool steel with vanadium and molybdenum. Air-hardening with minimal distortion. Superior wear resistance and edge retention. The global benchmark for cold stamping dies, blanking tools, shear blades, and forming tools.
HS6-5-2-5
1.3243
Standard cobalt high speed steel with 5% Co — the most widely used cobalt HSS grade. Also known as M35 or HSS-E/HSSE. Better hot hardness and cutting performance than M2, lower cost than M42. HRC 64-66 hardened. The "go-to upgrade" when M2 performance is insufficient. Used for drill bits (HSS-Co branded), taps, end mills, saw blades, and general-purpose cutting tools for stainless steel and medium-hard alloys.
| D2 / X155CrVMo12-1 | HS6-5-2-5 | |
|---|---|---|
| Material Number | 1.2379 | 1.3243 |
| Category | Tool Steel | Tool Steel |
| Standard | EN ISO 4957 | EN ISO 4957 |
Chemical composition (wt%)
| Element | D2 / X155CrVMo12-1 | HS6-5-2-5 | Overlap |
|---|---|---|---|
| C | 1.45–1.6% | 0.86–0.94% | No overlap |
| Si | 0.1–0.4% | 0–0.45% | OK |
| Mn | 0.15–0.45% | 0–0.4% | Partial |
| P | 0–0.03% | — | — |
Mechanical properties
| Property | D2 / X155CrVMo12-1 | HS6-5-2-5 | Unit |
|---|---|---|---|
| hardness_hrc | 58–62 | 64–66 | HRC |
| hardness_hb | ≤ 255 | ≤ 280 | HB |
| e_modulus | ≥ 210 | ≥ 210 | GPa |
Compatibility Assessment
D2 / X155CrVMo12-1 and HS6-5-2-5 have significantly different compositions (18% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is D2 / X155CrVMo12-1 the same as HS6-5-2-5?
D2 / X155CrVMo12-1 and HS6-5-2-5 have a 18% composition overlap. They are generally not directly interchangeable.
Can I replace D2 / X155CrVMo12-1 with HS6-5-2-5?
Generally not recommended. The compositions differ significantly (18% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between D2 / X155CrVMo12-1 and HS6-5-2-5?
The main differences are in the following elements: C, Mn, Cr, Mo. D2 / X155CrVMo12-1 is a Tool Steel grade, while HS6-5-2-5 is a Tool Steel grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.