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Full Description

1.1 This specification covers heavy thickness high-strength, low-alloy hot-rolled sheet and strip, in coils beyond the size limits of Specification A715. The product has improved formability when compared with steels covered by Specification A935/A935M. The product is furnished only as coils and is available in four-strength levels, Grades 50, 60, 70 and 80 (345, 415, 485, 550) (corresponding to minimum yield strength (see Table 1)). The steel is killed, made to a fine grain practice, and includes microalloying elements such as columbium, titanium, vanadium, zirconium, etc. The steel may be treated to achieve inclusion control. The product is intended for miscellaneous applications where higher strength, savings in weight, improved formability, and weldability are important. Atmospheric corrosion resistance of these steels is equivalent to plain carbon steels. With copper specified, the atmospheric corrosion resistance is somewhat enhanced.

Note 1-For methods of establishing the atmospheric corrosion resistance of low-alloy steels, see Guide G101.

1.1.1 This material is available only in coils described as follows:

Size Limits, Coils Only Product Width, in. (mm) Thickness, in. (mm) Strip Over 8 to 12 (Over 200-300) 0.230 to 0.750, incl (Over 6.0 to 19) Sheet Over 12 to 48 (Over 300-1200) 0.230 to 0.750, incl (Over 6.0 to 19) Over 48 (Over 1200) 0.180 to 0.750, incl (Over 4.5 to 19)

1.2 Sheet and strip in coils of sizes noted in 1.1 can be included in this specification only with the following:

1.2.1 The material is not to be converted into steel plates for structural or pressure vessel use.

1.2.2 This specification is not applicable to the steels covered by Specification A635/A635M.

1.2.3 The dimensional tolerances of Specification A635/ A635M are applicable to material produced to this specification.

1.2.4 The material is to be fed directly from coils into a blanking press, drawing or forming operation, tube mill, rolling mill, or sheared or slit into blanks for subsequent drawing or forming.

1.2.5 Not all strength levels are available in all thicknesses. The user should consult the producer for appropriate size limitations.

1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.