8115
Data verified8115 is a lean triple-alloy (Ni-Cr-Mo) carburizing steel designed for economical case hardening of small parts. Small additions of each element give balanced hardenability at lower alloy cost than 8620.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.13–0.18 |
| Si | 0.15–0.35 |
| Mn | 0.70–0.90 |
| P | ≤0.035 |
| S | ≤0.040 |
| Cr | 0.30–0.50 |
| Ni | 0.20–0.40 |
| Mo | 0.08–0.15 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Case hardness (carburized) | 58–62 HRC |
| Core tensile strength | 600–850 MPa (typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Carburize 900–930 °C; quench 820–850 °C oil; temper 150–200 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | 8115 |
Compare side by side: 8115 vs 8615
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Small gears, pinions, bushings, automotive ancillary parts.
Processing: Good machinability; shallow effective case in larger sections — keep parts small.
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Ask for a quotationVisit NasteelSource: SAE J404 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.