DIN EU EN UNI ISO 16MnCr5 Round Bars UNE 16MnCr5 Rods

Product Description

The 16MnCr5 grade (Werkstoff number 1.7131) is one of the most widely used European alloy case-hardening (carburizing) steels. It is fully standardized across all major European national and international bodies, including DIN, EN, UNI, ISO, and UNE.

It is specifically formulated for components requiring a hard, wear-resistant surface skin combined with a tough, ductile core to withstand high shock loads and dynamic torsional stress.

🌐 Standard Cross-References

Whether specified under old national standards or modern unified European norms, the material remains identical:

• European Union (EN): EN 10084 (16MnCr5 / 1.7131)

• Germany (DIN): DIN 16MnCr5

• Italy (UNI): UNI 16MnCr5

• Spain (UNE): UNE 16MnCr5

• International (ISO): ISO 683-11 (16MnCr5)

🛠️ Chemical Composition (%)

The combination of manganese ($Mn$) and chromium ($Cr$) provides excellent hardenability and uniform case depth, while the low carbon content ensures the core remains highly ductile.

*Controlled sulfur variants (e.g., 16MnCrS5 / 1.7139) are available with $S = 0.020 - 0.040\%$ to specifically enhance high-speed machinability.

🔄 International Equivalents

If you are cross-referencing outside of the European standard framework, 16MnCr5 corresponds closely to:

• USA (AISI/SAE): 5115 or 5117

• Japan (JIS): SMnC420

• Russia (GOST): 15KhG or 18KhG

• United Kingdom (BS): 527M17

• China (GB): 20CrMn

📈 Mechanical Properties (Typical Post-Heat Treatment)

After carburizing, quenching, and low-temperature tempering, the core and surface exhibit distinct properties.

Core Properties (Tested on standard $\varnothing 11\text{mm}$ reference test pieces)

• Tensile Strength ($R_m$): $880 - 1180\text{ MPa}$

• Yield Strength ($R_e$): $\ge 635\text{ MPa}$

• Elongation ($A_5$): $\ge 9\%$

• Impact Energy ($KV$): $\ge 41\text{ J}$

Surface Properties

• Case-Hardened Surface Hardness: $58 - 62\text{ HRC}$ (providing extreme wear and abrasion resistance)

⚙️ Key Technical Features

• Excellent Carburizing Response: It develops a highly uniform, deep carbon-rich layer when treated in gas, plasma, or vacuum carburizing furnaces.

• Dimensional Stability: It responds well to direct quenching or double hardening cycles with manageable distortion profiles, making it highly valued for precision components.

• Superb Machinability: In the annealed ($+A$) or treated to ferrite-pearlite structure ($+FP$) states, it offers excellent chip breakability and minimal tool wear during gear cutting and turning.

🚀 Typical Applications

16MnCr5 round bars and rods are essential components in power transmission systems, automotive engineering, and heavy clamping hardware:

• Gearboxes & Drivetrains: Spur gears, helical gears, pinion shafts, synchronizer hubs, and splined drive shafts.

• Engine & Steering Components: Camshafts, universal joint journals, steering worms, and piston gudgeon pins.

• Industrial Hardware: High-wear guide bushings, specialized clamping pins, and heavy-duty structural toggle linkages.

Available Supply Forms

• Surface Finishes: Black hot-rolled, bright cold-drawn (for tight tolerances), centerless turned, or ground finish.

• Delivery Conditions: * $+A$: Soft annealed (maximum soft state for easy cold forming/machining)

  • $+TH$: Treated to hardness range

  • $+FP$: Treated to ferrite-pearlite structure (optimized for uniform machinability)

  • $+N$: Normalized