Designation: A – 90b (Reapproved ). Standard carbon steel bars, hot rolled 1 in. diameter by 10 ft, ASTM A dated ___. SAE According to standards. ASTM A b Hot Rolled. Number. ASTM A /AM: Cold-drawn. Equivalent. USA AISI/SAE. Italy UNI. (ASTM) (Continued) ASTM A51 1 () ASTM A51 () ASTM A51 3 (a) ASTM A/AM () ASTM A () ASTM Ab.

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Special bar quality SBQ steels represents a wide variety of higher quality carbon and alloy steels. Already Subscribed to this document.

Your email address will not be published. Special bar quality steel may have products of shapes which can be classified into round, square and hexagonal bars. Similar is the case of resulfurized and rephosphorized steels.

The internal quality of these steels is very important since machining and bending activities are involved during the processing of these steels in subsequent stages. Steel cleanliness can be achieved through the integrated route or through an additional refining zstm and cleaner iron bearing inputs into an EAF in a mini mill.

Sulphur content in the 15 grades of the resulfurized steels also have different ranges of sulfur with a minimum of 0. Subscription pricing is determined by: SBQ steels are used in safety critical applications.


Special quality bar applications include forging, heat treating, cold drawing, machining, and many structural uses. SBQ steels are at the higher end of the quality spectrum in both metallurgical consistency and dimensional accuracy.

Although there is no single definition, special bar quality steel can be defined as steel that moves rotates, twists or bends rather than stays still whilst in use. SBQ steels are used for wind turbine components, sstm and seamless tubes. These steels have superior mechanical properties and defect free surface. Most producers see ties to the automotive industry as the key drivers of the SBQ steel grades.

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This specification has got 53 grades under the category of non-resulfurized steels, 15 grades under the category of resulfurized steels and 5 grades under rephosphorized and resulfurized category.

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ASTM standard A b covers specification for plain carbon special quality bar steels for applications which includes forging, heat treating, cold drawing, machining and many structural uses.

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Quality SAE 1018 Chemical composition Temperature °C

Internal metallurgical quality and consistency is also achieved by a meaningful reduction during the rolling process. Please first log in with a verified email before subscribing to alerts. A guide for the selection of steel bars is contained in Practice A In order to achieve metallurgical quality, the steel has to be particularly clean. The main application area for special bar quality steels is the automotive industry for engine, transmission, steering, suspension and hydraulic components Fig 1.


Fig 1 Some of the uses of SBQ steels in automotive industry. You can download and atm this file to your own computer but DRM prevents opening this file on another computer, including a networked server.

These steels are produced both in cut lengths and coils.

Pipe billet

Some end uses of these steels may require superior surface quality, or special chemical restrictions, metallurgical characteristics, heat treatment or surface finishes. These steels are produced with more precise dimensions and chemistry. This standard is also available to be included in Standards Subscriptions.

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Special Bar Quality steels |

Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. The specification of SBQ steels may range atm plain carbon and carbon manganese steels to alloy and stainless steels containing different percentages of aluminum, nickel, chrome and other alloying elements.

This standard is not included in any packages. The petroleum industry uses them to produce valves and pipeline couplings for oil extraction.