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ASTM A276 AISI 303 Stainless Steel Bar Supplier

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Backed by rich industry experience, is presenting a large array of Stainless Steel 303 Round and Flat Bars. ASTM A276 303 SS Rod is widely used in various industries for various purposes. Our range of UNS S30300 Hex and Square Bars is manufactured by our experts in the manufacturing units, using high-quality raw materials to suit the requirements of our valuable clients. 

Additionally, all Grade 303 Bars and Rods undergo a series of practical tests to ensure their durability.However, the corrosion resistance of this alloy grade is generally lower than that of grade 304. Even though sulphur improves machinability, it also results in certain drawbacks in the ASTM A479 UNS S30300 hex bar. First, the alloy’s corrosion resistance is reduced. Second, its toughness is slightly reduced. 

Furthermore, those regions in the microstructure of astm a276 type 303 flat bar which contain sulphur act as initiators for corrosion by means of pitting. But for both intermittent and continuous use, the alloy exhibits good resistance to oxidation, up to temperatures 927°C. Yet, manufacturers do not recommend using the JIS SUS 303 black bar at temperatures exceeding 760°C, solely because of higher carbon content, promoting carbide precipitation.

A The result is irregular scaling on the 303 stainless steel rod. Generally, lower carbon-containing alloys are resilient to becoming susceptible to sensitisation, unlike the 303 stainless steel welding rod. While welding this material is not recommended, it is a task that could be undertaken by welding the AISI 303 threaded bar with the aid of electrodes produced in stainless steel grade 310. 

The result is irregular scaling on dissolution of carbide precipitates and achievement of a high machining rate, with the hardness property of the ss 303 bright bar valued between a range of 200 to 240 Brinell.

SS 303 Round Bars are generally used in automatic screw machines when wide-ranging machining is required. Due to the high quality of raw materials, we also offer these UNS S30300 Round Bars (also known as W NR 1.4305 Bars) in custom sizes and thicknesses as per specific demands of our esteemed clients at market leading prices.

Unlike austenitic grade 304, stainless steel 303 contains sulphur or selenium. The addition of element sulphur is referred to as stainless steel 303, but the addition of element selenium is referred to as 303se, indicating that the metal has been alloyed with selenium. 

Using either of these two elements, the WNR 1.4305 square bar has been optimised for machinability. Therefore, if superior machinability properties are required, this alloy is the best choice. Additionally to improved machinability, 303 Steel Cold Finished Bars have superior galling characteristics.

This alloy grade, however, tends to have a lower corrosion resistance than grade 304. The addition of sulphur improves the machinability of the ASTM A479 UNS S30300 hex bar, but it also causes certain drawbacks. The alloy becomes less corrosion-resistant. In addition, its toughness properties are slightly reduced.

In addition, sulphide-containing regions in the microstructure of astm a276 type 303 flat bars act as corrosion initiators by pitting. For both intermittent and continuous use, the alloy exhibits good oxidation resistance up to 927°C. The JIS SUS 303 black bar, however, is not recommended for use at temperatures exceeding 760°C because of its high carbon content, which promotes carbide precipitation.

A This causes irregular scaling in the 303 stainless steel rod. Contrary to the 303 stainless steel welding rod, lower carbon-containing alloys are less susceptible to becoming sensitised. Welding this material is not recommended, however it can be achieved by welding AISI 303 threaded bars with the aid of electrodes produced in stainless steel grade 310. Anodizing of this alloy offers its benefits including the dissolution of carbide precipitates and a high machine rate, with the hardness property of SS 303 bright bars being between 200 and 240 Brinell.

Alloy description

Stainless steel alloy 303 is an authentic, nonmagnetic stainless steel that is not hardened by heat treatment. The stainless steel alloy contains 18% chromium and 8% nickel. Due to the presence of sulphur, sulphur-containing alloys are readily machinable. The alloy is designed to improve machinability while maintaining good mechanical and corrosion resistance properties. It is extremely tough. The following are some of the features that make round bars the most preferred product among different industries:

  • Corrosion resistibility
  • Heat corrosion resistance ability
  • Highly ductile
  • Good weldability property
  • High tensile strength
  • Durable in nature

Quality assurance

Each stage of the manufacturing process is checked for quality by our hired personnel. The quality of the product depends on the demands of the customer and on the guidelines by which the round bars are manufactured.

The manufacturing process of the round bars

AISI 303 Stainless Steel Round Bars are manufactured by gathering suitable raw materials from reliable market vendors. After the alloy and the raw material are collected, they are tested and checked before going into the manufacturing process. Bar’s ranges are maintained according to national and international quality standards and appropriate manufacturing standards. Furthermore, these bars undergo multiple stages of manufacturing to maintain their smoothness and thickness. Under the strict supervision of the hired experts who are masters of the stainless steel round bar manufacturing process, the manufacturing process is carried out. They supervise the employees in maintaining the quality of the bars in order to achieve the organisation’s goals.

Material testing

Before dispatching the products from the manufacturing unit, many tests are performed. Among them are:

  • Mechanical test
  • Chemical test
  • Positive material identification test
  • Micro and macro test
  • Pitting resistance test
  • Third party inspection
  • Visual inspection

Test certifications

We provide our customers with the good quality of the product along with the test certificates that increase the sales of our product. The test certificates provided are-

  • Raw material certificate
  • 100% radiography test
  • Third party inspection statement

These certificates are given in accordance with the EN 10204/ 3.1.

Documentation of AISI 303 Stainless Steel Round Bars

Along with the manufactured goods various documents are attached for the doubt clearance of the clients. The documents are-

  • Commercial invoice
  • Guarantee letter of the company
  • Chemical test report
  • Mechanical test report
  • Visual inspection statement
  • Packaging list

Packaging of the round bars

The AISI 303 Stainless Steel Round Bars are wrapped in plastic bags to withstand extreme weather conditions. To prevent the bars from getting damaged during the time of shipment the round bars are packed in the wooden boxes, wooden crates, and wooden pallets. All the shipment documents along with the product description are attached with the wooden boxes. We ensure our clients the fast and safe delivery of the product.


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Stainless Steel 303 Bar Specifications


ASTM A276, ASME SA276 / ASTM A479 ASME SA479


303 Round Bar




4mm to 500 mm


1 to 6 Metres, Custom Cut Length


Round, Square, Rectangle, Hex (A/F), Ingot, Billet, Forging Etc


Black, Rough Turned, Bright Polished, No 4 Finish, Matt Finish, BA Finish

Bright Bars Size

OD: 4mm to 100mm

Hex Bars Size

18mm – 57mm (11/16″ to 2-3/4″)

Square Bars Size

18mm – 47mm (11/16″ to 1-3/4″)

Flat Bars Size

1/2” to 10” in thickness range of 2 mm to 150mm

Angle bars Size



3.0 to 12.0mm thickness

Channel Bars Size

80 x 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness

Hollow Bar Size

32mm OD x 16mm ID to 250mm OD x 200mm ID)

Billet Size

1/2″ to 495mm Diameter

Rectangles Size

33 x 30mm to 295 x 1066mm


Hardened & tempered, annealed


Cold Drawn, Bright, Sand Blasting Finished, Hot Rolled Pickled, Hairline, Polished

Price Terms

Ex-Works, FOB, CFR, CIF, CNF

Latest Price

Call +91 9619406392


Chemical Composition of ASTM A276 AISI 303 Stainless Steel Bar










SS 303













Mechanical Properties of ASTM A276 AISI 303 Stainless Steel Round Bars


Melting Point

Tensile Strength

Yield Strength (0.2%Offset)


0.285 lb/in3

Psi – 85000

Psi – 45000

50 %


ASTM A276 AISI 303 Stainless Steel Bar Equivalent Grade

Grade DIN UNS SUS Inox
SS 303 1.4305 S30300 303 303

Alloy Steel F1 A182 Round Bars & Rods Forms & Availability

    • Alloy Steel F1 Square Bar
    • F1 Alloy Steel Square Bars
    • Chrome Moly F1 Square Bar
    • ASTM A182 F1 Alloy Steel Square Bars
    • Alloy Steel F1 Rectangular Bar
    • F1 Alloy Steel Rectangular Bars
    • Chrome Moly  F1 Rectangular Bar
    • ASTM A182 F1 Alloy Steel Rectangular Bar
    • Alloy Steel F1 Flat Bars
    • F1 Alloy Steel Flat Bars
    • Chrome Moly F1 Flat Bars

Types of ASTM A276 AISI 303 Stainless Steel Round Bars

303 Stainless Cold Finish Round Bar UNS S30300 Stainless Steel Rod Dealer
Stainless Steel S30300 Forged Bar Distributors DIN 1.4305 SS Threaded Bar Stockholder
ASTM 276 AISI 303 Stainless Steel Black Bar Stainless Steel JIS SUS 303 Flat Bar
Steel 303 Rectangular Bar Exporter SS UNS S30300 Hex Bar Manufacturer
ASTM/ASME A276 303 Steel Bright Bars Stocks 303 Stainless Steel Square Bars Stockist
Stainless Steel 303 Round Bars Supplier ASTM A276 303 Stainless Steel Flat Bars
WERKSTOFF NR. 1.4305 Flat Bars UNS S30300 SS Flat Bars
303 Stainless Steel Flat Bars 303 SS Flat Bars


ASTM A276 AISI 303 Stainless Steel Bar Physical Properties

Element SS 303
Density, lb/in3 0.285
Modulus of Elasticity, psi 29 x 106
Linear Expansion, 68-212°F, /°F 9.4 x 10-6
Thermal Conductivity, Btu/ft hr°F 8.7
Heat Capacity, Btu/lb°F 0.12
Electrical Resistivity, Ω-inch 27.6 x 10-6

ASTM A276 AISI 303 Stainless Steel Bar Types / Forms

303 SS Polished Round Bar

Stainless Steel 303 T-Bar

WERKSTOFF NR. 1.4305 Square Bar

303 SS Triangle Bar

ASME SA276 303 SS Flat Bar

ASME SA479 303 SS Hex Bar

303 SS Hollow Bar

UNS S30300 Round Bar

303 SS Precision Ground Bar

ASTM A276 303 Threaded Bar

303 SS AISI Rebar

JIS SUS 303 True Bar

303 SS Cold Drawn Bar

303 SS Hot Rolled Bar

ASTM A479 303 SS Rods

DIN 1.4305 Half Round Bar

303 SS Polish / Bright Bar

303 SS Forged & Black Bar

Markings On The Stainless Steel 303 Round Bar

Bars should be marked with their full identification along their entire length, including:

  •   Rating Designation
  •   Material Designation
  •   “WP” in grade symbol
  •   Grade
  •   Schedule number or nominal wall thickness
  •   Heat Code
  •   Manufacturer’s Name or Symbol

ASTM A276 AISI 303 Stainless Steel Bar Application Industries

  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals
  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry

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