ISO 4995 pdf download.Hot-rolled steel sheet of structural quality
1 Scope
1.1 This International Standard applies to hot-rolled steel sheet of structural quality in the grades and classes listed in Tables 1 and 2, usually without the use of microalloying elements. The product is intended for structural purposes where particular mechanical properties are required. It is generally used in the delivered condition and is intended for bolted, riveted or welded structures. This product is produced on a wide strip mill, not a plate mill. 1.2 This product is commonly produced in thicknesses from 1 ,6 mm to 6 mm and widths of 600 mm and over, in coils and cut lengths. 1.3 Hot-rolled sheet less than 600 mm wide may be slit from wide sheet and will be considered as sheet. NOTE Hot-rolled sheet up to but not including 3 mm in thickness is commonly know as “sheet”. Hot-rolled sheet 3 mm and over in thickness is commonly know as either “sheet” or “plate”. 1.4 This International Standard does not cover steels intended for boilers or pressure vessels, or steels designated as commercial quality or drawing qualities (covered in ISO 3573 [1 ] ) or steels to be re-rolled to cold- reduced products, or steels designated as weathering steels, having increased atmospheric corrosion resistance.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 6892:1 998, Metallic materials — Tensile testing at ambienttemperature
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply. 3.1 microalloying elements elements, such as niobium, vanadium, titanium, etc., added singly or in combination to obtain higher strength levels combined with better formability, weldability and toughness as compared with non-alloyed steel produced to equivalent strength levels 3.2 hot-rolled steel sheet a product obtained by rolling heated steel through a continuous-type or reversing-type wide strip mill to the required sheet thickness NOTE The product has a surface covered with oxide or scale resulting from the hot rolling operation.3.3 hot-rolled descaled steel sheet hot-rolled steel sheet from which oxide or scale has been removed, commonly by pickling in an acid solution NOTE Descaling may also be performed by mechanical means such as grit blasting. Some change in properties may result from descaling. 3.4 mill edge a normal side edge without any definite contour produced in hot-rolling NOTE Mill edges may contain some irregularities such as cracked or torn edges or thin (feathered) edges. 3.5 sheared edge a normal edge obtained by shearing, slitting or trimming a mill edge product NOTE Normal processing does not necessarily provide a definite positioning of the slitting burr.
4 Conditions of manufacture
4.1 Steelmaking Unless otherwise agreed by the interested parties, the processes used in making the steel and in manufacturing hot-rolled sheet are left to the discretion of the manufacturer. On request, the purchaser shall be informed of the steelmaking process being used. 4.2 Chemical composition The chemical composition (heat analysis) shall conform to the requirements given in Tables 1 and 2. 4.3 Chemical analysis 4.3.1 Heat analysis A heat analysis of each heat of steel shall be made by the manufacturer in order to determine the percentage of all elements listed in Tables 1 and 2. On request, this analysis shall be reported to the purchaser or his representative. 4.3.2 Product analysis A product analysis may be made by the purchaser in order to verify the specified analysis of the product and shall take into consideration any normal heterogeneity. Non-killed steels (such as rimmed or capped) are not technologically suited to product analysis. For killed steel, the sampling method and deviation limits shall be agreed upon between the interested parties at the time of ordering. 4.4 Weldability This product is normally suitable for welding if appropriate welding conditions are selected. For non-descaled steel, it may be necessary to remove the scale or oxide depending upon the welding method. As the carbon content increases above 0,1 5 %, spot welding becomes increasingly difficult. 4.5 Application It is desirable that hot-rolled steel sheet be identified for fabrication by the name of the part or by the intended application. Proper identification of the part may include visual examination, prints or description, or a combination of these.