Stainless Steel 304 Round Bar

Usually, various kinds of surface treatments are performed on the SS 304 Round Bar in order to add value to them. For instance, galvanization conducted on the bars is a coating of a thick layer of zinc.

Stainless Steel 304 Round Bar

This layer of zinc added on the SS 304 Square Bar is much thicker with a galvanization process in comparison to electroplating. Thus, the corrosion resistance property of a galvanised bar would be much more than an electroplated SS rod. Another technique used to treat the surface of SS 304 Bars is polishing or buffing. Polishing the surface of any stainless steel component is what makes it shiny and smooth while masking defects or dents. Furthermore, since polishing a 304 SS Flat Bar also makes the cleaning process easier. Since the surface of these bars is smooth, the chance of a cleaning agent molecule getting attached to the bar and corroding it is thoroughly eliminated by polishing. Very often SS components that have been polished with an abrasive and a polishing agent creates a reflective surface on the SS component. This reflective surface is due to deflection of light, thereby giving the SS 304 Bright rod a brighter appearance, hence, the suggestive name. 304 SS Hex Bar, on the other hand, can be used for decorative purposes, especially in buildings, structures as well as architecture. Although a 304 SS Hollow rod may look like a pipe or a tube, the tensile strength properties are similar to a solid rod.


Stainless Steel 304 Round Bar Specification List

Specifications of Stainless Steel 304 Round Bar American Society for Testing and Materials A276, ASME SA479
Dimensions of UNS S30400 Forged Round Bar European Standards, DIN, Japanese Industry Standard, American Society for Testing and Materials
SS 304 Round Bars
0.15 Inch to 19.68 Inch
ASTM A276 Grade 304 rod Length 39.37" - 236.22"

Equivalent material grade of SS 304 Round Bar

STANDARD WERKSTOFF NR. Japanese Industry Standard BS GOST AFNOR unified numbering system EN
SS 304 Round Bar 1.4301 SUS 304 304S31 08Х18Н10 Z7CN18‐09 S30400 X5CrNi18-10

ASTM A276 Grade 304 Hex Bar Chemical Analysis

Stainless Steel 304 Round Bar Grade Carbon Manganese Silicon sulphur Phosphorus Chromium Nickel Molybdenum Other
0.08 Maximum 2 Maximum 0.75 Maximum 0.045 Maximum 0.030 Maximum 18 – 20 8 – 11

Mechanical Properties UNS S30400 Forged Round Bar

Density Tensile Strength High Yield Strength Melting Point Elongation
8.0 g/cm3 Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 1400 °C (2550 °F) 35 %

What is the difference between what is a276 type 304 and ASTM A479 grade 304?

The specification ASTM A476 takes into consideration the steel bars produced in different forms. These forms include round bars, square bars, and hex bars. Moreover, the ASTM A 476 specification also covers stainless steel hot rolled or extruded structural shapes, for instance, angles, tees, and channels. In retrospect ATSM A 479 specified products tend to be well suited for applications in boiler and pressure vessel construction. Although its use in the fore mentioned application tends to be conditional on the material not only being subjected to a mechanical test, but also its conformance to properties such as tensile strength, yield strength, elongation, and Brinell hardness. While the austenitic stainless steel grades covered here are to be subjected to heat treatment, they must also undergo a corrosion test.

As for specification ASTM A 276, it encompasses various shapes for stainless steel bars i.e. rounds, squares, and hexagons and can be used for hot-finished or cold-finished stainless steel bars, except the re-forge bars.  In comparison to ASTM A 476, the specification  ASTM A 276 is more detailed oriented with its furnishing processes.  Condition A in where the stainless steel bars are annealed, bars produced in Condition H are hardened and tempered at a relative temperature. Condition T states that stainless steel bars are to be hardened and tempered at a relatively high temperature, whereas Condition S stainless steel bars have been either strain hardened or these bars have been relatively light cold worked. Not forgetting Condition B wherein the bars are to be relatively severe cold worked.