Description
AISI 303 Round Bars ASTM A582 / EN 1.4305 Round Bars
AISI 303 Round Bars is an Austenitic Stainless Steel Free-Machining Grade developed for applications requiring excellent machinability, good corrosion resistance, and smooth machining performance. Also known as SS 303 Round Bar and 303 Stainless Steel Round Bar, it contains sulfur to improve machinability and is widely used for precision-machined components, shafts, fittings, fasteners, screws, bushings, and turned parts.
Textron Steel and Alloys supplies AISI 303 Round Bars in various diameters, finishes, lengths, and specifications to meet industrial and engineering requirements. The material is available in bright, cold drawn, peeled, polished, ground, and black finishes depending on application and dimensional requirements.
Textron Steel and Alloys is a supplier and stockist of AISI 303 Stainless Steel Round Bar in Mumbai, India. We supply SS 303 round bars to engineering, automotive, machinery, fabrication, instrumentation, and general industrial applications.
Our AISI 303 Round Bars can be supplied in standard and customized sizes, subject to availability and production requirements. Material can be supplied with relevant test certificates and inspection documentation as required by the customer.
AISI 303 Chemical Composition of EN 1.4305 / X8CrNiS18-9 :
| Standard | ASTM A582 | EN 10088-3 | ||
| Grade | AISI 303 | 1.4305 | ||
| UNS S30300 | X8CrNiS18-9 | |||
| Elements | Min. | Max. | Min. | Max. |
| C | – | 0.15 | – | 0.10 |
| Mn | – | 2.00 | – | 2.00 |
| P | – | 0.20 | – | 0.045 |
| S | 0.15 | – | 0.15 | 0.35 |
| Si | – | 1.00 | – | 1.00 |
| Cr | 17.00 | 19.00 | 17.00 | 19.00 |
| Ni | 8.00 | 10.00 | 8.00 | 10.00 |
| N | – | 0.11 | ||
| Cu | – | 1.00 | ||
AISI 303 Round Bar Properties :
The addition of sulfur gives AISI 303 Stainless Steel Round Bar significantly improved machinability compared with conventional austenitic stainless steel grades. This makes it particularly suitable for automatic screw machines and high-volume machining operations.
Important properties include:
• Excellent machinability
• Good corrosion resistance in mild environments
• Good dimensional consistency
• Non-magnetic in the annealed condition
• Good surface finish after machining
• Good toughness
• Good formability for suitable applications
• Suitable for precision-machined components
• Good resistance to oxidation in normal service conditions
However, the sulfur content that improves machinability also reduces corrosion resistance and weldability compared with AISI 304 Stainless Steel.
Applications of AISI 303 :
AISI 303 Round Bar is widely used where machining is a major manufacturing operation. Typical applications include:
• Precision machined components
• Shafts
• Bushes and bushings
• Pins
• Screws
• Nuts and bolts
• Fasteners
• Fittings
• Valve components
• Instrumentation components
• Electrical fittings
• Automotive components
• Machine components
• Pump components
• Threaded components
• Automatic screw-machine parts
• General engineering components
Machinability of AISI 303 :
One of the main advantages of 303 Stainless Steel Round Bar is its machinability. The controlled sulfur addition creates short machining chips and reduces cutting difficulties, making the grade suitable for turning, drilling, tapping, milling, and other machining operations.
For manufacturers producing large quantities of small precision components, AISI 303 can provide efficient machining performance and good productivity.
AISI 303 Round Bar Equivalent Grades :
Common identification terms associated with the grade include:• AISI 303
• UNS S30300
• EN 1.4305
• EN Name X8CrNiS18-9
• SS 303 Stainless Steel
People also search as :
AISI 303 Round Bar is commonly searched and specified under several names:
• AISI 303 Round Bar
• SS 303 Round Bar
• Stainless Steel 303 Round Bar
• 303 Stainless Steel Round Bar
• UNS S30300 Round Bar
• ASTM A276 303 Round Bar
• ASTM A479 303 Round Bar
• Grade 303 Stainless Steel Round Bar
• 303 SS Bright Bar
• 303 Stainless Steel Bright Bar
• 303 Free Machining Stainless Steel Round Bar
1.4305 / X8CrNiS18-9 falls under below standards :
EN 10088-2: 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
EN 10088-3: 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes
EN 10297-2: 2005 Seamless circular steel tubes for mechanical and general engineering purposes. Stainless steel. Technical delivery conditions
EN 10088-1: 2005 Stainless steels. List of stainless steels
EN 10088-5: 2009 Stainless steels. Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes
