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Steel 11SMnPb37

11SMnPb37 (1.0737) is a high-quality, non-alloyed free-cutting steel designed for machining applications like turning, milling, and drilling, commonly used for precision mechanical components, it offers excellent machinability, faster production, and a better surface finish on machined components.

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Steel 11smnpb37 CNC machining


  • Faster and less expensive production
  • Excellent machinability
  • Improved surface finish


  • Slightly reduced mechanical strength
  • Slightly reduced toughness


  • Machining process: CNC Machining
  • Tolerances: ISO 2768-1 fine (f) or medium (m) class. Info
  • Max size: 150x150x500 mm; 5.9x5.9x19.7 in
  • Lead time: <6 days
HP-certified 1


4.81 / 5 from 281 reviews



Faster and less expensive production

The 11SMnPb37 steel's exceptional machinability leads to faster, cost-effective production, providing manufacturers with a competitive edge by lowering operational expenses and expediting delivery times.


Excellent machinability

11SMnPb37 steel's excellent machinability allows for smoother, more efficient machining processes, reducing tool wear and resulting in precise, high-quality components with minimal effort.


Improved surface finish

The improved surface finish of 11SMnPb37 steel components ensures a polished appearance, reducing the need for post-processing and enhancing the final product's aesthetic and functional quality.



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Steel 11SMnPb37 (1.0737) emerges as a versatile solution in the industrial materials landscape, offering a number of significant advantages along with some disadvantages to be carefully considered. In this overview, we will examine the pros and cons of this alloy, comparing it with other available options and offering suggestions for its best applications.


Excellent machinability: The superior machinability of AVP 11SMnPb37 steel results in smoother and more efficient machining processes, allowing for easier handling during production. This feature not only optimises operational efficiency, but also contributes to a significant reduction in tool wear, increasing the life and effectiveness of the tools used in the production process.

Faster and cheaper production: Thanks to its outstanding machinability, this alloy offers tangible advantages in terms of production time and cost. The increased machinability enables faster production and higher overall productivity, while reducing the operating costs associated with processing materials. This translates into greater market competitiveness and improved profitability for companies using this type of steel.

Improved surface finish: Thanks to its optimum machinability, 11 steel allows a high quality surface finish to be achieved right from the initial processing stage. This results in a more aesthetic appearance of the manufactured components and reduces the need for subsequent post-production operations. As a result, in addition to improving the aesthetics of the final product, the additional time and costs associated with finishing components are also reduced.


Reduced mechanical strength: The presence of lead in this steel leads to a decrease in its mechanical strength compared to other alloys. Although this does not significantly compromise the material's performance, it is important to consider this factor when designing and using components, especially in applications requiring high levels of strength.

Lower toughness: The lead content in AVP 11SMnPb37 steel also affects its toughness, making it less resistant to impacts and shocks than other alloys with similar characteristics but without lead. This reduction in toughness may be an issue to consider in applications where impact resistance is crucial for component safety and reliability. Therefore, it is advisable to carefully assess the specific requirements of the application before using this material.

Comparison with other steels

11SMnPb37 vs. 11SMn30 (1.0715): Steel 11SMnPb37, due to its lead content, excels in the superior machinability it offers. This characteristic makes it particularly suitable for machining processes that require smooth and easy handling of materials. On the other hand, 11SMn30 stands out for its higher mechanical strength and toughness, as it has no lead in its composition. These characteristics make it more suitable for applications requiring greater strength and impact resistance, without compromising machinability. Therefore, the choice between the two will depend on the specific requirements of the application and the priorities in terms of performance and machinability.

The best applications

Precision mechanical components: AVP steel proves to be the ideal option for the production of precision mechanical components. This material is particularly suitable for the manufacture of gears, screws, bolts, pins and other fasteners that require superior machinability. This feature also allows for precise and accurate handling during the production process, ensuring the production of high-quality, reliable parts for applications requiring tight tolerances and dimensional accuracy.

Components requiring a high quality surface finish: Due to its optimum machinability properties, steel 11 is perfectly suited for the production of components requiring a high quality surface finish. The ability to obtain an excellent surface finish directly from the primary machining process reduces the need for additional post-production operations such as grinding or polishing, significantly improving the appearance and functionality of the final product. This makes the 11SMnPb37 an excellent choice for applications where aesthetic appearance and surface quality are priorities, ensuring greater customer satisfaction and improved market competitiveness.


AVP 11SMnPb37 steel is an excellent choice for a wide range of industrial applications due to its exceptional machinability and the benefits it offers in terms of operational efficiency and end-product quality. However, it is important to carefully consider its disadvantages, such as reduced mechanical strength and lower toughness, and compare them with the specific requirements of the application. While this alloy may be ideal for applications requiring a high quality surface finish and rapid production, other lead-free alloys may be preferable in contexts where strength and toughness are priorities. Therefore, a thorough evaluation of material characteristics and project requirements is essential for an optimal and durable choice.

"I recently ordered a batch of custom gears from Weerg for our production line, made from 11SMnPb37 steel. I must say, I am genuinely impressed with the quality of the components and the overall service provided. The machining was top-notch, and the excellent surface finish made the gears ready for immediate use. Weerg's team was highly professional and responsive throughout the entire process. The production turnaround time was impressive, allowing us to keep our schedule on track. I highly recommend Weerg for precision mechanical components made from 11SMnPb37 steel. Their expertise and customer service are unmatched!"


Tensile breaking load 550 MPa
Modulus of elasticity 205 GPa
Elongation at break 7%
Density 7,7 g/cm³
Melting temperature 1370-1400°C
Hardness 146-226 HB
Yield strength 440 MPa




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