Description
EN41B Round Bars
EN41B Round Bars is defined as Cr-Mo-Al Nitriding steel as per BS 970 Standard. This material can obtain high wear resistance,good toughness and ductility after nitriding which can give a hard wear resistant case up to 68HRC. After hardened and tempered,EN41B has a tensile strength of 700-850MPa in R condition, and 775-925MPa in S condition. Typical applications for this steel are connecting rods, small extruders, valve stems, injection moulding equipment, hydraulic.
EN41B Round Bar is a Nitriding Steel, also known as a case-hardening steel, containing chromium, aluminum, and molybdenum. It is known for its high wear resistance, good toughness, and ductility, especially after nitriding. After heat treatment, it achieves a hard wear-resistant case, often up to 68HRC.
EN41B Chemical Composition :
| Elements | Min. | Max. |
| C | 0.35 | 0.45 |
| Si | 0.10 | 0.45 |
| Mn | – | 0.65 |
| P | – | 0.020 |
| S | – | 0.010 |
| Ni | – | 0.40 |
| Cr | 1.50 | 1.70 |
| Mo | 0.13 | 0.22 |
| Cu | – | 0.25 |
| Al | 0.90 | 1.30 |
Applications of EN41B Round Bars:
EN41B is widely used in the automotive, textile, and general engineering industries, particularly for components requiring high wear resistance such as gears, connecting rods, valve stems, and hydraulic cylinders.
Nitriding :
EN41B is specifically designed for nitriding, a process that hardens the surface of the steel to improve wear resistance.
High Wear Resistance :
The nitriding process significantly enhances the material’s ability to withstand wear and abrasion.
Good Toughness and Ductility :
Despite its hardness after nitriding, EN41B retains good toughness and ductility, making it suitable for applications with impact loads.
Heat Treatment :
Annealing : EN41B can be annealed by heating it slowly to 650-700°C and cooling in air.
Hardening : If further hardening is required, annealed EN41B should be heated to 870-930°C, quenched in oil/polymer or water, and tempered promptly.
Stress Relieving : Stress relieving can be done before hardening by heating to 700°C, equalizing, and then slowly cooling.
Tempering : Tempering should be done carefully to the appropriate temperature, as determined by a tempering chart or table.
