9SMN28 Free Cutting Steel
We are 9SMN28 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 9SMN28 Free Cutting Steels (DIN 9SMn28 / W.Nr 1.0715 / EN 11SMn30 / BS 970 230M07 / AISI 1213 / SAE 1213) that meet national and international quality standards for precision automatic screw machine parts, hydraulic nipples, turned fasteners, bushings, and high-volume CNC components. 9SMN28 Free Cutting Steel is a premier German standard (DIN 9SMn28 / W.Nr 1.0715) low-carbon free machining steel engineered specifically for high-rpm automatic lathe machining and multi-spindle CNC turning centers. Formulated with low Carbon (0.14% max), Manganese (0.90–1.30%), and elevated Sulphur (0.27–0.33%), 9SMN28 forms evenly distributed microscopic Manganese Sulphide (MnS) inclusions that act as internal chip breakers. This unique metallurgical design permits high cutting speeds, reduces cutting temperature, and delivers a mirror-smooth surface finish without edge built-up or tool drag. Offered in cold drawn (+C), turned, or centerless ground condition, 9SMN28 provides precise dimensional tolerances (h9/h10), high bar straightness, and uniform machinability. Because of its outstanding chip control and cost efficiency, 9SMN28 Steel is universally specified across high-volume automotive component turning, hydraulic fitting production, electrical hardware, textile machinery, and general mechanical engineering sectors.
Our 9SMN28 Free Cutting Steels are 100% Prime – Tested & Guaranteed, ensuring precise chemical composition, dimensional accuracy, 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 9SMN28 Free Cutting Steel?
9SMN28 Free Cutting Steel (DIN 9SMn28 / W.Nr 1.0715 / EN 11SMn30 / BS 970 230M07 / AISI 1213 / SAE 1213) is a low-carbon unalloyed free-machining structural steel specified under German (DIN 17210) and European (EN 10087) standards. Formulated with max 0.14% Carbon, 0.90–1.30% Manganese, and high Sulphur (0.27–0.33%), 9SMN28 is designed specifically for mass-production machining on automatic screw machines and high-speed CNC lathes. The microscopic Manganese Sulphide (MnS) inclusions break turnings into short, non-tangling chips, lowering tool friction and preventing edge built-up. In cold drawn supply condition (+C), 9SMN28 provides high bar straightness, tight h9/h10 dimensional tolerances, and tensile strength between 380 and 550 MPa. It is widely specified for precision turned pins, hydraulic hose fittings, electrical terminal posts, bushings, threaded studs, and high-volume automotive turned parts.
100% Machinability
High-speed cutting capability for maximum throughput on automatic screw machines.
0.27–0.33% Sulphur
High sulphur content generates MnS inclusions for effortless chip breaking.
Smooth Finish
Delivers clean, burr-free surfaces without edge built-up or tool drag.
380–550 MPa Tensile
Cold drawn bar condition offers enhanced tensile strength & dimensional stability.
Extended Tool Life
Lower cutting friction prolongs tool insert life & reduces production downtime.
Fastener Grade
Universal choice for high-volume threaded bolts, nuts, studs, & hydraulic nipples.
Why Choose STEEL MART for 9SMN28 Free Cutting Steel
STEEL MART is the preferred choice for purchasing 9SMN28 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 9SMN28 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 9SMN28 Free Cutting Steels, STEEL MART also supplies a wide range of free-cutting, alloy steel, and carbon steel products for various industrial applications.
Chemical Composition of 9SMN28 Free Cutting Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.14 % Max |
| Manganese (Mn) | 0.90 – 1.30 % |
| Sulphur (S) | 0.27 – 0.33 % |
| Phosphorus (P) | 0.11 % Max |
| Silicon (Si) | 0.05 % Max |
Elevated Sulphur (0.27-0.33%) and Manganese (0.90-1.30%) combine to form MnS inclusions for optimal chip breaking.
Equivalent Grades of 9SMN28 Free Cutting Steel
| Standard | Equivalent Grade |
|---|---|
| DIN / EN | 9SMn28 / 1.0715 / 11SMn30 |
| BS 970 | 230M07 / EN1A |
| AISI / SAE | AISI 1213 / SAE 1213 |
| JIS | SUM22 |
| ISO | 11SMn28 |
These international equivalents ensure global engineering specification compatibility.
Mechanical Properties of 9SMN28 Free Cutting Steel (Cold Drawn)
The mechanical properties of 9SMN28 Free Cutting Steels make them ideal for high-speed lathe turning, automatic screw machine components, and precision threaded fasteners. In cold drawn condition (+C), 9SMN28 delivers uniform mechanical strength and high bar straightness.
Manufacturing & Cold Processing of 9SMN28 Free Cutting Steel
9SMN28 Free Cutting Steel bars undergo hot rolling, descaling, precision cold drawing, and stress relieving to establish dimensional accuracy and bar straightness.
Hot Rolling (1050°C - 1150°C)
Primary hot rolling of billets into round, hex, and square bar profiles with controlled cooling.
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.
9SMN28 Industry Applications
9SMN28 Free Cutting Steels are widely used across Precision Screw Machining, Automotive Fasteners, Hydraulic Fittings, Electrical Terminals, and General Engineering Spares.
Precision Screw Machine Parts
High-volume turned components, automatic lathe pins, inserts, spacers, & precision bushings.
Threaded Fasteners & Studs
Standard nuts, bolts, set screws, threaded rods, tie bars, & automotive studs.
Hydraulic Fittings & Couplings
Hose nipples, hydraulic adaptors, pipe union fittings, valve stems, & pneumatic connectors.
Automotive Components
Control rod pins, wiper mechanism shafts, door latch components, & instrument cluster inserts.
Electrical Hardware & Terminals
Electrical connector pins, terminal posts, switchgear shafts, & earth grounding rods.
Textile & Appliance Spares
Spinning machine spindles, loom pins, washing machine shaft inserts, & hardware fittings.
Availability and Customization
At STEEL MART, we supply 9SMN28 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 chemical composition and machining performance.
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9SMN28 Free Cutting Steel (DIN 9SMn28 / W.Nr 1.0715 / EN 11SMn30 / BS 970 230M07 / AISI 1213 / SAE 1213) is a premier German standard high-machinability low-carbon steel widely specified across automatic screw machining, precision turned components, hydraulic hose adaptors, threaded fasteners, electrical pins, and automotive hardware. Combining elevated sulphur (0.27–0.33%) for clean chip breaking, low cutting resistance for extended tool life, and high bar straightness in cold drawn condition (+C), it delivers maximum efficiency and superior surface finish on high-speed CNC lathes. Supplied by STEEL MART with strict quality inspection and full EN 10204 3.1 Mill Test Certification, 9SMN28 Free Cutting Steel is a benchmark grade for mass production machining.
Frequently Asked Questions
Common answers regarding 9SMN28 Free Cutting Steel specifications and parameters.
9SMN28 contains max 0.14% Carbon, 0.90–1.30% Manganese, 0.27–0.33% Sulphur, max 0.11% Phosphorus, and max 0.05% Silicon.
9SMN28 features elevated sulphur and manganese contents that form Manganese Sulphide (MnS) inclusions, acting as internal chip breakers during machining to allow high cutting speeds, smooth surface finish, and minimal tool wear.
9SMN28 (DIN 9SMn28 / W.Nr 1.0715) is equivalent to European EN 11SMn30, British BS 970 230M07 (EN 1A), and American AISI 1213 / SAE 1213, offering matching chemical composition and machinability characteristics.
High-volume screw machine turned parts, nuts, bolts, studs, hydraulic hose fittings, electrical terminal pins, control rods, and textile machinery components.
STEEL MART supplies 9SMN28 in round bars, hexagon bars, square bars, and flat bars in Cold Drawn (+C), Centerless Ground, or Turned condition with mill test certificates.