1.7131 - 16MnCr5 - 14 220
Delivery condition
Round bars:
+U – untreated / not heat-treated
Sheets and plates:
+A – soft annealed
+N – normalized
Werkstoffnummer
⚙️ Basic designation
| Parameter | Value |
|---|---|
| Material number, EN/DIN | 1.7131 |
| EN designation | 16MnCr5 |
| ČSN designation | 14 220 |
| AISI / SAE equivalent | 5115 |
| Steel type | Alloyed case-hardening structural steel |
| Standard | EN 10084 – case-hardening steels |
Properties and applications
🔩 Properties
| Property | Description |
|---|---|
| Hardness after case hardening | up to 60 HRC |
| Toughness | High, especially in the core after case hardening |
| Machinability | Good in soft condition |
| Weldability | Limited, requires preheating and subsequent heat treatment |
| Heat treatment | Suitable for case hardening, hardening and tempering |
🧰 Applications
| Industry / Area | Typical applications | Required properties |
|---|---|---|
| Mechanical engineering and automotive industry | gears, shafts, cams, pins, tie rods, clutches | hard surface after case hardening, 58–62 HRC, tough core |
| Gearboxes and mechanical drives | gears, synchronizer components, gearbox shafts | wear resistance and fatigue strength |
| Bearings and guide components | plain bearings, guide pins, bushings | smooth hard surface with good sliding properties |
| Automated machinery and equipment | cam and linkage mechanisms, transmission components | dimensional stability and precision after heat treatment |
| Connecting and moving parts | gear couplings, pins, pulleys, gear segments | combination of strength, toughness and surface hardness |
Chemical composition
⚗️ Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.14–0.19 |
| Mn | 1.00–1.30 |
| Cr | 0.80–1.10 |
| Si | max. 0.40 |
| P | max. 0.025 |
| S | max. 0.035 |
Heat treatment
🔥 Typical heat treatment
| Process | Temperature (°C) | Medium / Procedure | Purpose and result |
|---|---|---|---|
| Soft annealing | 650–700 | Slow cooling in furnace | Stress relief, improved machinability, hardness approx. 200 HB |
| Normalizing | 850–880 | Air cooling | Grain refinement, structure homogenization before case hardening |
| Carburizing | 880–940 | Gas or salt bath atmosphere | Carbon enrichment of the surface to a depth of 0.8–1.2 mm |
| Hardening after carburizing | 780–820 | Oil | Surface hardness after hardening 58–62 HRC, core approx. 35 HRC |
| Tempering | 150–200 | Air, 1–2 hours | Removal of internal stresses, stabilization of the surface layer |
| Core hardening, optional | 830–870 | Oil | Increased core strength, hardness approx. 35–40 HRC |
| Low tempering after core hardening | 180–220 | Air | Improved toughness without significant loss of hardness |
🧩 Resulting properties after treatment
| Zone | Hardness (HRC) | Characteristics |
|---|---|---|
| Surface after carburizing | 58–62 | High wear resistance |
| Transition zone | 45–50 | Smooth hardness transition |
| Core | 30–40 | Tough, impact-resistant |
Delivery condition
Werkstoffnummer
Properties and applications
Chemical composition
Heat treatment
