Stainless Steel Bright Bars

Geometrically precise in shape the SS 904L DIN 1.4539 Square Bright Bars are known to maintain a strict adherence with regards to their dimensions. Very often, the surface of these bright bars tend to be shiny and smooth, thus appearing bright. Hence, the term bright bars are used to indicate this SS Bright Rod.

Stainless Steel Bright Bars

This smooth, shiny and bright surface is a result of several mechanical surface treatments conducted on them. For instance, the SS 304/L/H Rectangular Bright Bar is drawn, peeled or ground over the hot rolled finished SS bar sent across by the mill. Available in various shapes such as flats, hexagonal and squares, the most common form is the SS Bright Round Bar. SS Bright Bars manufacturers in India produce and supply bars of different qualities and grades across to many industries such as the automobile, textiles, railways, defence as well as heavy engineering industries as well. The addition of sulphur to the alloy of ss 303 bright bar is what enhances the machinability of this SS, albeit with a compromise in its corrosion resistance properties. On the other hand, ss 304 bright bar has excellent resistance to rust while offering good weldability. While both 303 and 304 are austenitic alloy grades, the ss 410 bright bar is a martensitic grade that offers properties like mild resistance to corrosion, high strength, as well as heat resistance.


Standard Specification of Stainless Steel Bright Bars

Avilable Size of Stainless Steel Bright Bars: 5 MM to 105 MM
SS Bright Bars Tolerance: h8 to h9, k12 to k13
Stainless Steel Bright Round Bar Standard: As per Japanese Industry Standard, American Society for Testing and Materials, British Standard, American Society of Mechanical Engineers, etc.
SS 303 Bright Bar Length: 1 - 6 M

Composition Standard of Polished Stainless Steel Round Bar

Grade Carbon Manganese Silicon Phosphorus sulphur Chromium Molybdenum Nickel Nitrogen
SS Bright Bars 0.08 max 2.0 max 1.0 max 0.045 max 0.030 max 16.00 - 18.00 2.00 - 3.00 11.00 - 14.00 67.845 min

SS 303 Bright Bar Mechanical Strength

Density Elongation Melting Point Tensile Strength High Yield Strength
8.0 g/cm3 35 % 1399 °C (2550 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205

SS Bright Rod Available grades

  • SS 304
  • SS 304H
  • SS 304L
  • SS 310 / 310S
  • SS 310H
  • SS 316 / 316L
  • SS 316Ti
  • SS 317
  • SS 317L
  • SS 347
  • SS 347H
  • SS 410
  • SS 446
  • SS 904L

SS Bright Bar Vs Black Bar

Basically a black bar is what has been referred to as the predecessor of bright bars. This would mean that a bright bar has been processed much more as compared to a black bar and is a primary reason why the cost of a bright bar is much higher than a black bar. Furthermore, the Black stainless steel tends to be relatively inexpensive as opposed to bright drawn stainless steel since black bars are fairly regularly produced without any delays occurring in its manufacturing process, unlike bright bars. Therefore the reheating of the black stainless steel bars is not required as it is mandated with bright drawn). On cooling, stainless steel black bars will shrink slightly. Thus giving little control with regards to the size as well as the shape of the finished product if compared to bright drawn bars.

On the other hand, since bright bars are processed further in cold reduction mills, these bars have much closer dimensional tolerance and can undergo a much wider range of surface finishes. Bright bars have a much better outlook as well due to the cold finishing process it undergoes. For instance, the yield and tensile strength of bright bars sees an increase due to a Cold drawing process, which eliminates the needs for expensive heat treatments. Surface imperfections are reduced due to turning operations, while polishing improves the surface finish of bright bars. On the other hand, Grinding bright bars is what narrows the original size tolerance range. Apart from being annealed, bright bars contain a lesser content of carbon as compared to stainless steel black bars, thus making it softer.