9SMNPB Free Cutting Steel
We are 9SMNPB Free Cutting Steel Manufacturers, Suppliers, and Exporters in Mumbai, India. STEEL MART is an ISO 9001:2015 certified company established in 1986, with decades of experience in supplying high-quality free-cutting steel products to various industries. We specialize in manufacturing and supplying 9SMNPB Leaded Free Cutting Steels (DIN 9SMnPb28 / W.Nr 1.0718 / EN 11SMnPb30 / BS 970 220M07 Leaded / AISI 12L14 approx) that meet national and international quality standards for ultra-high-speed automatic lathe parts, precision turned fasteners, hydraulic nipples, bushings, and high-volume turned components. 9SMNPB Free Cutting Steel is a premier German standard (DIN 9SMnPb28 / W.Nr 1.0718) leaded low-carbon free machining steel engineered specifically for maximum cutting speeds, superior chip fragmentation, and minimal tool wear on multi-spindle CNC automatics. Formulated with controlled Carbon (0.14% max), Manganese (0.90–1.30%), elevated Sulphur (0.27–0.33%), and an intentional Lead addition (0.15–0.35% Pb), 9SMNPB provides an extraordinary machinability rating (130–140%). The microscopic lead droplets act as an internal lubricant during cutting, reducing friction at the tool-chip interface and preventing built-up edge. Supplied in cold drawn (+C), turned, or centerless ground condition, 9SMNPB provides precise dimensional tolerances (h9/h10), high bar straightness, and outstanding surface finish. Because of its unmatched speed and tool life advantages, 9SMNPB Steel is widely specified across high-volume automotive component turning, hydraulic connector production, electrical hardware, and precision instrument manufacturing.
Our 9SMNPB Free Cutting Steels are 100% Prime – Tested & Guaranteed, ensuring precise lead dispersion, accurate chemical composition, and consistent machinability. Each product is supplied with proper Mill Test Certificates (MTC) confirming compliance with DIN 17210 / EN 10087 standards with EN 10204 3.1 certification. STEEL MART follows strict quality control procedures and ensures timely delivery.
What is 9SMNPB Free Cutting Steel?
9SMNPB Free Cutting Steel (DIN 9SMnPb28 / W.Nr 1.0718 / EN 11SMnPb30 / BS 970 220M07 Leaded / AISI 12L14 approx) is a leaded low-carbon unalloyed free-machining steel specified under German (DIN 17210) and European (EN 10087) standards. Formulated with max 0.14% Carbon, 0.90–1.30% Manganese, 0.27–0.33% Sulphur, and 0.15–0.35% Lead (Pb), 9SMNPB represents the absolute pinnacle of high-speed machining performance. The microscopic lead droplets act as an internal lubricant at the cutting interface, lowering friction, reducing spindle power requirements, and preventing built-up edge on carbide cutting inserts. In cold drawn supply condition (+C), 9SMNPB offers high bar straightness, tight h9/h10 tolerances, and tensile strength between 390 and 570 MPa. It is widely specified for ultra-high-volume automatic lathe components, hydraulic fittings, electrical connectors, watchmaking spindles, turned fasteners, and automotive turned hardware.
140% Machinability
Highest cutting speed potential on multi-spindle & Swiss-type CNC automatics.
0.15–0.35% Lead (Pb)
Microscopic lead dispersions act as internal lubricant, reducing cutting friction.
Mirror Surface Finish
Produces pristine, burr-free surfaces without built-up edge formation.
390–570 MPa Tensile
Cold drawn (+C) bar finish ensures dimensional accuracy & high straightness.
Extended Tool Life
Reduced friction dramatically extends carbide insert life and lowers downtime.
High-Volume Turned Parts
Ideal choice for hydraulic nipples, electrical pins, watchmaking shafts, & fasteners.
Why Choose STEEL MART for 9SMNPB Free Cutting Steel
STEEL MART is the preferred choice for purchasing 9SMNPB Free Cutting Steel due to its strong reputation for quality and reliability. With over 40 years of experience in the steel industry, the company ensures that every product meets strict industry standards. The company follows strict quality inspection procedures to ensure that every 9SMNPB Free Cutting Steel product meets international standards.
Each product is carefully tested to ensure durability, strength, and performance. Customers trust STEEL MART for consistent quality, competitive pricing, and timely delivery. The company maintains a large inventory to meet urgent and bulk requirements efficiently. In addition to 9SMNPB Free Cutting Steels, STEEL MART also supplies a wide range of leaded, free-cutting, alloy steel, and carbon steel products for various industrial applications.
Chemical Composition of 9SMNPB Free Cutting Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.14 % Max |
| Manganese (Mn) | 0.90 – 1.30 % |
| Sulphur (S) | 0.27 – 0.33 % |
| Lead (Pb) | 0.15 – 0.35 % |
| Phosphorus (P) | 0.11 % Max |
| Silicon (Si) | 0.05 % Max |
Elevated Sulphur (0.27-0.33%) and Lead (0.15-0.35%) combine to deliver unmatched ultra-high-speed machinability.
Equivalent Grades of 9SMNPB Free Cutting Steel
| Standard | Equivalent Grade |
|---|---|
| DIN / EN | 9SMnPb28 / 1.0718 / 11SMnPb30 |
| BS 970 | 220M07 Leaded / EN1A Pb |
| AISI / SAE | AISI 12L14 approx / SAE 12L14 |
| JIS | SUM22L / SUM23L |
| ISO | 11SMnPb28 |
These international equivalents ensure global engineering specification compatibility.
Mechanical Properties of 9SMNPB Free Cutting Steel (Cold Drawn)
The mechanical properties of 9SMNPB Free Cutting Steels make them ideal for ultra-high-speed automatic screw lathe turning, precision threaded fasteners, and hydraulic connectors. In cold drawn condition (+C), 9SMNPB delivers uniform mechanical strength and high bar straightness.
Manufacturing & Cold Processing of 9SMNPB Free Cutting Steel
9SMNPB Free Cutting Steel bars undergo hot rolling with controlled lead addition, descaling, precision cold drawing, and stress relieving to establish dimensional accuracy and bar straightness.
Hot Rolling & Lead Addition
Primary hot rolling with precise lead (Pb) liquid injection to ensure uniform microscopic lead dispersion.
Shot Blasting & Pickling
Surface descaling to remove oxide scale prior to cold drawing operations.
Precision Cold Drawing (+C)
Drawn through precision carbide dies to achieve tight h9 / h10 dimensional tolerances.
Straightening & Cut-to-Length
Multi-roll reel straightening and precision saw cutting to customer specification.
9SMNPB Industry Applications
9SMNPB Free Cutting Steels are widely used across Ultra-High-Speed Screw Machining, Automotive Turned Parts, Hydraulic Nipples, Electrical Hardware, and Watch Spindles.
Ultra-High-Speed Turned Components
High-volume turned pins, automatic lathe inserts, spacers, precision bushings, & sleeves.
Precision Fasteners & Studs
Standard nuts, bolts, set screws, threaded rods, tie bars, & automotive turned studs.
Hydraulic Fittings & Adaptors
Hose nipples, hydraulic adaptors, pipe union fittings, valve stems, & pneumatic connectors.
Automotive Precision Components
Control rod pins, wiper mechanism shafts, door latch components, & instrument cluster inserts.
Electrical Hardware & Pins
Electrical connector pins, terminal posts, switchgear shafts, & earth grounding rods.
Precision Instrument Spindles
Watchmaking gear pivots, micrometer shafts, optical equipment pins, & gauge inserts.
Availability and Customization
At STEEL MART, we supply 9SMNPB Free Cutting Steels in a wide range of sizes and specifications.
| Profiles Available | Round Bars, Hexagon Bars, Square Bars, & Flat Bars |
| Diameter / Size | Round: 5 mm to 100 mm | Hex: 6 mm to 75 mm AF | Square: 6 mm to 50 mm |
| Condition | Supplied in Cold Drawn (+C), Centerless Ground, or Turned condition |
| Length | Standard lengths from 3 meters to 6 meters |
| Tolerances | h9, h10, or h11 precision drawn tolerance per ISO / DIN 175 |
| Customization | Band-saw cut-to-length and chamfered bar ends available upon request |
| Certification | Supplied with 100% Prime Mill Test Certificate (EN 10204 3.1) |
Our strict quality control ensures consistent lead dispersion, chemical composition, and machining performance.
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9SMNPB Free Cutting Steel (DIN 9SMnPb28 / W.Nr 1.0718 / EN 11SMnPb30 / BS 970 220M07 Leaded / AISI 12L14 approx) is a premier German standard leaded ultra-high-machinability steel widely specified across high-volume automatic screw machining, precision turned parts, hydraulic connectors, electrical terminal pins, and watchmaking spindles. Combining lead addition (0.15–0.35% Pb) for internal tool lubrication, high sulphur (0.27–0.33%) for clean chip fragmentation, and 130–140% machinability rating, it delivers maximum production throughput, mirror surface finishes, and extended cutting insert life on high-speed CNC automatics. Supplied by STEEL MART with strict quality inspection and full EN 10204 3.1 Mill Test Certification, 9SMNPB Free Cutting Steel is an outstanding leaded grade for mass production turned components.
Frequently Asked Questions
Common answers regarding 9SMNPB Free Cutting Steel specifications and parameters.
9SMNPB contains max 0.14% Carbon, 0.90–1.30% Manganese, 0.27–0.33% Sulphur, 0.15–0.35% Lead (Pb), max 0.11% Phosphorus, and max 0.05% Silicon.
Lead acts as an internal lubricant during cutting, reducing friction at the tool-chip interface, lowering cutting power requirements, preventing built-up edge, and boosting machinability rating to 130–140%.
9SMNPB (DIN 9SMnPb28 / W.Nr 1.0718) is equivalent to European EN 11SMnPb30, British BS 970 220M07 Leaded (EN 1A Pb), and American AISI 12L14 approx / SAE 12L14, offering matching chemical composition and machinability characteristics.
Ultra-high-speed screw machine turned parts, nuts, bolts, studs, hydraulic hose fittings, electrical terminal pins, control rods, and precision instrument spindles.
STEEL MART supplies 9SMNPB in round bars, hexagon bars, square bars, and flat bars in Cold Drawn (+C), Centerless Ground, or Turned condition with mill test certificates.