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Grade Introduction:

En41B Alloy steel is a 1.5% Chromium Aluminum Molybdenum Nitriding Steel. En41B is a very popular grade of low carbon Manganese Free Cutting Steel, which is most suitable for the manufacture of repetition turned components, such as nuts, bolts, hydraulic fittings, and studs, particularly where intricate drilling and machining operations are involved. It can be case-hardened, producing components with enhanced wear resistance. En41B Alloy steel is Chromium Aluminum Molybdenum Steel which is usually supplied in hardened and tempered condition. Properties of the steel combine high wear resistance together with toughness and ductility. It is defined by its suitability for nitriding from which 905M39 can give a hardware resistance case up to 68HRc. Suitable for applications requiring excellent resistance to wear and abrasion.

Grade Application:

EN41B is used for applications that require high wear resistance and abrasion in the automotive, textile, and general engineering industries. Typical applications: connecting rods, small extrudes, valve stems, brick press plates, clutch plates, gudgeon, track and shackle pins, injection molding equipment, hydraulic cylinders, gears, and pinions, die inserts, valve and gate parts, cams, piston pins, etc.

Equivalent grades:

BS 970:1955 :EN24T. BS 970:1991 :817M40T

Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, OHNS, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.

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Chemical composition:

The following table shows the chemical composition of EN41B steel:

Element C Si Mn S P Cr Mo Al
Content (%) 0.35-0.45 0.10-0.45 ≤0.65 ≤ 0.035 ≤ 0.035 1.40-1.80 0.10-0.25 1.90-1.30

Mechanical Properties:

Condition Tensile Strength, Mpa Yield Strength, Mpa Elongation, % Izod, KCV J Hardness, HB
R 700-850 480 16 28 201-255
S 775-925 525 14 16 223-277


Hardness: max 229HB

Heat Treatment:

Heat treatment temperatures, including the rate of heating, cooling, and soaking times will vary due to factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities.


930 – 970°C, water or oil quench.


600 – 650°C, Cooling in air.

Physical Properties

The physical properties of EN41B alloy steel are highlighted in the following table.

DENSITY (G/CM 3) 8.08
DENSITY (LB/IN 3) 0.292

Thermal Properties

Thermal Conductivity W/mK – 45
Coefficient of Thermal Expansion 0-250°C – 13.1

Forging Properties:

850 – 1200°C, cooling as slowly as possible in the sand after forged.

Stress Relieving:

If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 700°C, equalize, then cool slowly.


930 – 970°C, Cooling in air.


840 – 870°C, Cooling in the furnace.


Density (G/CM 3) – 8.08.


Readily machinable.


Not recommended.

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Ahmedabad, Amaravathi, Ambattur, Bangalore, Belgaum, Chennai, Chittoor, Coimbatore, Dindigul, Mysore, Nellore, Hyderabad, Kochi, Mangalore, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Tamil Nadu, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Ranipet, Sivakasi, Karur, Hosur, Nagercoil, Kanchipuram, Karaikudi, Neyveli, Cuddalore, Kumbakonam, Thiruvannamalai, Pollachi, Rajapalayam, Gudiyatham, Pudukottai, Vaniyambadi, Ambur, Nagapattinam, Trivandrum, Vijayawada, Guntur, Thirupathi, Nazarathpet, Kakinada, Kurnool, Kadapa, Nizamabad, Mahabubnagar, Karimnagar.