15CrMo5 vs 13CrMo4-5: Both low-alloy Cr-Mo boiler steels — slightly different Cr/C balance
15CrMo5 vs 13CrMo4-5
Side-by-side chemical composition and mechanical property comparison.
Overview
15CrMo5
1.7262
Low-carbon chromium-molybdenum creep-resistant steel for elevated temperature service up to ~550°C. Good weldability (low C) combined with long-term creep strength. Used for pressure vessel shells, boiler drums, superheater tubes, and petrochemical reactors. Part of the Cr-Mo series alongside 13CrMo4-5 and 10CrMo9-10.
13CrMo4-5
1.7335
Low-alloy Cr-Mo steel for elevated-temperature service. Good creep resistance up to 500°C. The standard grade for boiler tubes, headers, superheater tubes, and pressure equipment in power generation. Lower alloy content than 10CrMo9-10.
| 15CrMo5 | 13CrMo4-5 | |
|---|---|---|
| Material Number | 1.7262 | 1.7335 |
| Category | Alloy Steel | Alloy Steel |
| Standard | EN 10028-2 | EN 10028-2 |
Chemical composition (wt%)
| Element | 15CrMo5 | 13CrMo4-5 | Overlap |
|---|---|---|---|
| C | 0.12–0.18% | 0.1–0.17% | Partial |
| Si | 0–0.35% | 0–0.35% | OK |
| Mn | 0.4–0.8% | 0.4–1% | OK |
| P | 0–0.025% | 0–0.025% | OK |
Mechanical properties
| Property | 15CrMo5 | 13CrMo4-5 | Unit |
|---|---|---|---|
| tensile_strength | 440–590 | 440–590 | MPa |
| yield_strength | ≥ 270 | ≥ 290 | MPa |
| elongation | ≥ 22 | ≥ 20 | % |
Compatibility Assessment
15CrMo5 has slightly higher C (0.15 vs 0.13%) and Cr (0.9 vs 0.9%) giving marginally higher room-temp strength. 13CrMo4-5 is the more commonly specified grade for boiler/pressure vessel applications. Both suitable for service up to ~550°C. Choose 13CrMo4-5 as the default; 15CrMo5 where the specific grade is called out.
Frequently Asked Questions
Is 15CrMo5 the same as 13CrMo4-5?
15CrMo5 and 13CrMo4-5 have a 80% composition overlap. Both low-alloy Cr-Mo boiler steels — slightly different Cr/C balance
Can I replace 15CrMo5 with 13CrMo4-5?
In many cases, yes. The compositions overlap significantly (80%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 15CrMo5 and 13CrMo4-5?
The main differences are in the following elements: C. 15CrMo5 is a Alloy Steel grade, while 13CrMo4-5 is a Alloy Steel grade.
Related Comparisons
View full data for each material:
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.