25Н
Alloy Steel25Н
GOST (Russia) steel grade 25Н
Chemical Composition (%)
| C | 0.23 |
|---|---|
| SI | 0.17 |
| MN | 0.4 |
| NI | 1 |
| P | 0.04 |
| S | 0.04 |
Applications
Russian state standard (GOST) steel grade.
Available Forms
Bar, plate, sheet, tube, forgings, strip, wire
Uses
Low-alloy engineering steel with enhanced hardenability and strength from alloying elements. Nickel (≈3%) increases toughness and impact strength at low temperature. Applied to gears, shafts, bolts, connecting rods, pressure parts and heavy forgings in automotive, energy and machinery sectors.
Heat Treatment
Typically normalized (880–920 °C, air cool) or carburized (900–930 °C) for case-hardening grades, then quenched and tempered at 150–200 °C.
Precautions
Weldable with standard procedures; preheat may be needed for thick sections or higher-carbon/ alloy grades. Protect from decarburization during heating (controlled atmosphere or protective coating).
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