Stainless Steel 303 Tubes, Stainless Steel 303 Pipes, 303 Stainless Steel 303 Seamless Tubing, 303 Stainless Steel welded Tubing Manufacturer, Supplier & Distributor in India
Amardeep Steel Center is a leading manufacturer, supplier, and exporter of Stainless Steel 303 Pipes & Tubes, offering both seamless and welded variants across India and globally. As a trusted supplier, we deliver SS 303 Pipes and SS 303 Tubes that meet high standards for consistency in chemistry, finish, and documentation. Every lot comes with full traceability, EN 10204 3.1 MTC, and non-destructive testing to ensure confidence for your projects. Proudly made by Amardeep Steel Center, our tubing solutions are engineered to your exact drawings and finished to your requirements.
Stainless Steel 303 Pipes & Tubes (UNS S30300, EN 1.4305) are the free-machining member of the 18-8 family. Sulfur additions make 303 easy to machine and finish, which is ideal for precision fittings, connectors, and support tube work. Corrosion resistance is comparable to 304 in mild conditions but lower in chlorides and across welded zones, so grade selection should match the environment and fabrication plan.
Stainless Steel 303 Pipes & Tubes Specifications
Below are common standards used for Stainless Steel 303 Tubes and Pipes. 303 is widely available as mechanical tubing (ASTM A511 grades MT303/MT303Se). Welded or heat-exchanger tubes to A269/A249 may be on a make-to-order basis. For pressure pipe, mills often favor 304/316; confirm 303 coverage at RFQ stage.
| Item | Details |
|---|---|
| Grade | 303 Stainless, UNS S30300, EN 1.4305, AISI 303 |
| Typical Tube Standards | ASTM A511 seamless mechanical tubing (MT303/MT303Se); select availability to ASTM A269/A249 for welded/SE tubing |
| Manufacturing Routes | Seamless cold-drawn (mechanical), welded (TIG/laser) |
| Sizes | Metric and inch ODs; NB sizes limited and often custom |
| Lengths | SRL, DRL, cut lengths |
| Ends | Plain or beveled; deburred; special end-forms on request |
Stainless Steel 303 Pipes & Tubes Chemical Composition
Use these nominal limits for UNS S30300. Sulfur improves machinability but lowers corrosion resistance and weldability versus 304. For critical service, verify melt and inclusion control on the MTC
| Element | C | Mn | Si | P | S | Cr | Ni | Fe |
|---|---|---|---|---|---|---|---|---|
| % | ≤ 0.15 | ≤ 2.00 | ≤ 1.00 | ≤ 0.20 | 0.15 – 0.35 | 17.00 – 19.00 | 8.00 – 10.00 | Balance |
Stainless Steel 303 Pipes & Tubes Mechanical Properties
Values below are typical of annealed 303 at room temperature. Cold work raises strength. For acceptance, follow the product standard and purchase order.
| Property | Typical Value |
|---|---|
| Tensile Strength (UTS) | 600–700 MPa |
| Yield Strength (0.2%) | ~230 MPa |
| Elongation | ~35–50% |
| Hardness | ~HB 160–190 |
Stainless Steel 303 Pipes & Tubes Physical Properties
These help with weight, heat transfer, and fit-up calculations. Values are representative at ~20 °C
| Property | Value |
|---|---|
| Density | ~8.03 g/cm³ |
| Modulus of Elasticity | ~193 GPa |
| Thermal Conductivity | ~16.3 W/m·K |
| Electrical Resistivity | ~0.72 µΩ·m |
| Coefficient of Thermal Expansion (0–100 °C) | ~17.2 µm/m·K |
| Melting Range | ~1455 °C |
Equivalent Grades of Stainless Steel 303 Pipes & Tubes
Use cross-references to match specifications across regions. Always confirm chemistry and properties rather than relying only on the name.
| System | Designation |
|---|---|
| UNS | S30300 |
| EN | 1.4305 |
| EN Name | X8CrNiS18-9 |
| AISI | 303 |
| JIS | SUS303 |
| BS | 303S31 / EN 58M |
Stainless Steel 303 Pipes & Tubes Sizes
Availability for Stainless Steel 303 Tubes varies by mill. 303 is common in ASTM A511 mechanical tubing, with OD and wall ranges suited to machined fittings, supports, and conduit. Welded ornamental or exchanger tubes are usually made to order. Please treat the table below as a guide and share your required tolerance class with the RFQ.
| Form | OD Range | Wall Thickness Range | Lengths |
|---|---|---|---|
| Seamless mechanical tube (A511 MT303/MT303Se) | 0.25 in to 8.625 in (6.35–219.1 mm) | up to 0.625 in (15.9 mm) | SRL, DRL, custom cut |
| Welded tube (made to order) | 6–114.3 mm | 0.5–6.0 mm | 1–6 m, cut lengths |
| Shapes | Round standard; square/rectangular, oval, coil on request | — | — |
Applications of Stainless Steel 303 Pipes & Tubes
Pick 303 when fast, accurate machining and a clean finish matter more than maximum corrosion resistance or weld-heavy fabrication. For chloride-rich washdown or many welded joints, consider 304L or 316L.
- Precision machined fittings and connectors : Used for ferrules, compression ends, adapters, and valve bodies where threads and tight tolerances are critical. High machinability shortens cycle time and improves surface finish.
- Instrumentation brackets, clamps, and supports : Ideal for clips, saddle clamps, and instrument stands mated with tube runs. Cold work adds strength without heat treatment and keeps visual quality high.
- Light-duty process tubing, guards, and conduits : Suitable for non-pressure utilities, cable conduits, and machine guards in mild indoor environments. For marine or high-chloride splash, upgrade to 316L.
FAQ’s about Stainless Steel 303 Pipes & Tubes
303 vs 304: which should I choose for tubing?
Choose 303 for superior machinability on fittings and short tube pieces. Choose 304/304L when you need better weldability and broader corrosion resistance, especially in chloride or welded service.
Is 303 weldable?
It can be welded in non-critical, low-stress situations but is not recommended for structural or pressure welds due to sulfur-related cracking risks. If welding is unavoidable, many fabricators use ER308L or ER309 and qualify procedures carefully.
Which standards cover Stainless Steel 303 Tubes?
303 is most commonly supplied as ASTM A511 seamless mechanical tubing (grades MT303/MT303Se). Welded tubes to A269/A249 may be available by special order. Confirm coverage and test clauses with your supplier.
What are typical sizes for 303 stainless steel tubing?
Mechanical tube ranges roughly from 0.25 in to 8.625 in OD with walls up to 0.625 in, while welded ornamental or exchanger tubes are produced to order in common metric sizes.
How does the 303 stainless steel pipe price vary?
Pricing depends on route (seamless mechanical vs welded), OD and wall, finish, tolerances, tests, and current nickel surcharges. Market listings show wide bands by route and finish. Share size and quantity for a firm price.
Is 303 suitable for food and marine service?
303 performs well in mild indoor environments. In chloride washdown, seawater, or crevice conditions it is prone to pitting; for those, choose 316/316L.
