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.
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.
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.
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.
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