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1.8159 (51CrV4) Spring Steel
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1.0715 11SMn30

1.0718 11SMnPb30

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Description

1.0718 (11SMnPb30) is a free-cutting low-carbon steel with added lead and sulfur, which improves machinability. It belongs to the group of free-cutting steels (EN 10087) and is characterized by good workability, surface quality, and dimensional accuracy. Due to its low carbon content, this steel has good weldability and can be easily cold-formed. The addition of lead and sulfur, which are known as free-cutting elements, enables the steel to be easily machined into complex shapes or small parts, making it an ideal material for machining operations such as drilling, turning, and milling.

This steel is often used in the production of small, intricate parts for the automotive, electronics, and machinery industries. It is also commonly used in the manufacturing of fittings, couplings, and hydraulic components.

Application Areas

Application Areas

Springs: This material is commonly used in the production of various types of springs, such as valve springs, suspension springs, and clutch springs. Its excellent combination of hardness, strength, and toughness makes it ideal for applications where high dynamic stresses are involved.

Gears and crankshafts: 1.8159 (51CrV4) spring steel is also used in the production of high-strength components such as gears and crankshafts. Its high strength and wear resistance make it suitable for use in applications where high stress and heavy loads are involved.

Automotive industry: In the automotive industry, this material is commonly used for the production of valve springs, suspension springs, and clutch springs. It is also used for other components that require high strength and wear resistance, such as camshafts and crankshafts.

Machinery industry: This material is used in various components of machinery, such as torsion bars, shafts, and couplings. Its high strength and toughness make it suitable for applications where heavy loads and high stress are involved.

Aerospace industry: 1.8159 (51CrV4) spring steel is also used in the aerospace industry for applications that require high strength and toughness, such as landing gear components, springs, and fasteners.

Technical Details

Technical Details

CHEMICAL COMPOSITION

Element Weight Percentage
C 0.14-0.19%
Si max 0.40%
Mn 1.00-1.30%
P max 0.11%
S 0.27-0.33%
Pb 0.15-0.35%
N max 0.11%

Please note that the above values are approximate and may vary depending on the manufacturer and specific product form.

HEAT TREATMENT

Process Temperature (°C) Cooling medium
Annealing 650 – 700 Furnace
Normalizing 850 – 880 Air
Quenching 820 – 870 Water, oil
Tempering 150 – 200 Air

It is important to note that the actual heat treatment process may vary depending on the manufacturer and specific application requirements. Therefore, it is always recommended to consult the manufacturer’s guidelines for the appropriate heat treatment process.

MECHANICAL PROPERTIES

Properties Value
Tensile strength (Rm) 440 – 690 MPa
Yield strength (Rp0.2) 350 – 620 MPa
Elongation (A) 8 – 22%
Reduction in area (Z) 30 – 60%
Hardness (HB) 100 – 220 HB
Young’s modulus (E) 200 – 215 GPa
Poisson’s ratio (ν) 0.28 – 0.30

Note that the values may vary depending on the specific heat treatment and processing of the material.

PHYSICAL PROPERTIES

Physical Property Value
Density 7.85 g/cm³
Elastic modulus 210 GPa
Thermal conductivity 46.6 W/(m·K)
Specific heat capacity 460 J/(kg·K)
Thermal expansion coefficient 11.7 × 10^-6/K
Electrical resistivity 1.45 × 10^-7 Ωm
Magnetic permeability 1.01 (at 20 °C)

Note that these values are approximate and may vary depending on the specific composition and processing of the material.