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Grade Introduction:

EN43B Carbon spring steel which is supplied in round bar, hexagon, flat, and also as spring steel plate and sheet. The plate can be flame cut to your requirements with normalizing recommended for this spring steel grade. The bar can be cut to your required lengths. Spring steel plate and sheet can be flame cut or guillotine cut to your requirements. Spring steel strip is available in coil, slit and cut to length. Spring steel, as its name suggests, is most commonly used in the manufacture of springs. When hardened and tempered (as supplied, or heat-treated by the customer) it offers excellent spring characteristics.

Grade Application:

EN43B is used commonly for many general engineering applications. Typical applications include springs, shafts, bushes, crankshafts, screws, sickles, axes, knives, woodworking drills, and hammers.

Equivalent grades:

Standards Designation

Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN47, EN353, IS2062, 42Crmo4, OHNS, HCHCR, 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 EN43B steel:

Element C Si Mn S P Cr Ni Cu
Content (%) 0.45-0.50 0.07-0.35 0.7-1.00 ≤0.05 ≤0.05

Mechanical Properties:

Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation in 100-150 mm(%) Reduction in Area Hardness
En43B ≥380 ≥210 ≥25 ≥50 ≤111HB


Heat Treatment:

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


Temper the EN43B spring steel component immediately after quenching whilst tools still hand warm. Re-heat to the tempering temperature then soak for one hour per 25 millimeters of a total thickness (2 hours minimum) Cool the steel in the air. For most applications tempering will be between 550-660°C.


Physical Properties

Physical Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in3

Thermal Properties

Forging Properties:

Preheat carefully, then raise the temperature to 1100°C for forging. Do not forge below 850°C. After forging cool slowly, preferably in a furnace.

Stress Relieving:



Heat the steel slowly to 680-710°C, soak well. Cool slowly in the furnace.


Density 7.85 g/cm3 0.284 lb/in3



Supply Cities:

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.