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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.
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.
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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The following table shows the chemical composition of EN41B steel:
|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|
|Condition||Tensile Strength, Mpa||Yield Strength, Mpa||Elongation, %||Izod, KCV J||Hardness, HB|
Hardness: max 229HB
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.
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|
|MELTING POINT (°C)||1425|
|MELTING POINT (°F)||2600|
Thermal Conductivity W/mK – 45
Coefficient of Thermal Expansion 0-250°C – 13.1
850 – 1200°C, cooling as slowly as possible in the sand after forged.
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.
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