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Edge Flat Bar and Sheared and Stainless Steel True

What is a Stainless Steel Flat Bar?

Stainless steel flat bar is a flat rectangular steel product that is usually available in two varieties: awesome and shear and edge bar. The two have different tolerances and differences. Stainless steel flat bar is considered an essential construction material due to its versatility, as it has relatively high strength and the ability to work in the field. Stainless steel flat bars also provide additional protection against corrosion for outdoor or marine applications.

Stainless Steel True and Sheared and Edge Flat Bar

What is True Bar?

  • True Bar is a flat bar that has been milled to a specific size and has the same surface finish on all four sides. True Bar has tight tolerances and the corners are square.
  • True Bar is typically hot rolled, annealed and treated with an acid solution to remove any surface oxidation. This process ensures a continuous polished surface, making True Bar more dimensionally accurate and increasing the corrosion resistance of the product.
  • True Bar requires quite complex processing steps to ensure that the final product meets the required specifications, making it more expensive than other types of flat bars.

What is Sheared and Edge Bar?

  • Shear and edge bars are cut from stainless steel coils into flat bars of a certain size. As shear and edge bars are cut rather than milled, the tolerances of the final product are less precise and the dimensions less ‘true’. The accuracy of shear and edge bars is dependent on the cutting method used, but shear and edge bars are often smoothed, straightened and polished to approximate the dimensional accuracy of real bars.
  • It is also worth noting that the four sides of sheared and edge bars are not identical. The cut edges will have a different surface finish compared to the original coil finish, which may have important practical applications.
  • As shear and edge bars are easier to manufacture than True Bar, they are usually the cheaper of the two options.

What are the Differences Between True and Sheared and Edge Flat Bar?

The main differences between the two types of stainless steel flat bars are:

  • True bars are milled to a specific size, while shear and edge bars are cut to the right size
  • True bars have tight tolerances and square corners, shear and edge bars are less precise and the tolerances are determined by the cutting method
  • True Bar has the same surface finish on all four sides, whereas shear and edge bars can have a different surface finish on each side
  • Ture Bar is generally a more expensive product than shear and edge bars

What are the Applications of True Bar and Sheared and Edge Bar?

  • Shear and edge bar is the most commonly used type of stainless steel flat bar as it is cheaper, easier to obtain and the final dimensional accuracy and finish is adequate for most applications. These mainly include structural and architectural applications.
  • Due mainly to the additional cost, True Bar is only used when high tolerances or continuity of surface finish is required. These include precision machinery, for example in the pharmaceutical or food industries, chemically sensitive applications (e.g. chemical processing) or machinery where product consistency is required to ensure safety, for example in the aerospace industry.

How do we Inspect Stainless Steel Flat Bars

Chemical Composition

  1. Composition indicators: the chemical composition of stainless steel flat steel is a general structural rolling steel series, the main test indicators for C, Mn, P, S four. According to the different grades, the content varies, the general range of C < 0.08%, Mn: 2.0, P < 0.035%, S < 0.03%.
  2. Test methods: When testing the above chemical composition, the standard test methods commonly used are GB223, JISG1211-1215, BS1837, BS Manual 19, ГОСТ22536, etc.

Specification Standards

  • GB/T2101-89 (General provisions for acceptance, packaging, marking and quality certification of steel sections); GB9787-88/GB9788-88 (Hot-rolled dimensions, shapes, weights and permissible deviations); JISG3192- 94 (shape, size, weight of hot-rolled sections and their permissible differences); DIN17100-80 (quality standards for ordinary structural steel); ГОСТ535-88 (technical conditions for ordinary carbon sections).
  • According to the above-mentioned standards, delivery shall be in bundles, the number of bundles and the length of the same bundle shall be in accordance with the regulations. They are generally delivered bare, and need to be protected from moisture during transport and storage.

Mechanical Properties

Test methods:

  • Tensile test method. Commonly used standard test methods are GB/T228-87, JISZ2201, JISZ2241, ASTMA370, ГОСТ1497, BS18, DIN50145, etc..
  •  Bending test method. Commonly used standard test methods are GB/T232-88, JISZ2204, JISZ2248, ASTME290, ГОСТ14019, DIN50111, etc.

Performance indicators: the test items for assessing performance are mainly tensile tests and bending tests. Indicators include yield point, tensile strength, elongation and bending qualified items.

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