BS ISO 16172-2018 pdf free download.Steel sheet, metallic-coated by the continuous hot-dip process for corrugated steel pipe
This document is applicable to the minimum requirements for steel sheet used in the manufacture of corrugated steel pipe, in coils, flat cut lengths and corrugated cut lengths metallic-coated by the continuous hot-dip process.
This product is intended for storm sewers, culverts, drains and similar uses.
Several metallic-coated materials are covered, which relies on users to determine which product best serves their needs. Four different metallic coatings are included:
— zinc coated;
— zinc-5 % aluminium-mischmetal alloy coated;
— 55 % aluminium-zinc alloy coated;
— aluminium-silicon alloy coated.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1460, Metallic coatings — Hot dip galvanized coatings on ferrous materials — Gravimetric determination of the mass per unit area
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 16163, Continuously hot-dipped coated steel sheet products — Dimensional and shape tolerances 3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms, definitions and abbreviated terms apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
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3.1 Terms and definitions
3.1.1 fabricator
<corrugated metal pipe> organization that produces the finished pipe
3.1.2 manufacturer
<corrugated metal pipe> organization that produces the metal sheet from which the pipe is made
3.1.3 purchaser
<corrugated metal pipe> person or agency that purchases the finished pipe Note 1 to entry: For the purposes of this document, the fabricator (3.1.1) may also be considered as the purchaser of the sheet, where that term is used in this document. Such an interpretation does not restrict the purchaser of finished pipe from enforcing any provisions of this specification.
3.1.4 lot up to a specified quantity of steel sheet of the same thickness and coating condition
3.2 Abbreviated terms
Zn zinc
Zn-5Al-MM zinc-5 % aluminium-mischmetal alloy
55Al-Zn 55 % aluminium-zinc alloy
Al-Si aluminium-silicon alloy
4 Condition of manufacture
4.1 Chemical composition
The chemical composition (heat analysis and product analysis) of the base metal shall conform to the requirements of Table 1.
.3 Coating
4.3.1 Coating mass
The coating mass shall conform with the requirements listed in Table 3. The coating mass is the total amount of coating on both sides of the sheet, expressed in grams per square metre.
4.3.2 Coating adherence
The adhesion of the coating shall be such that no peeling or flaking occurs while the coated sheet is being corrugated and formed into pipe.
4.4 Surface treatment
A chemical treatment is normally applied to the metallic-coated steel sheet to minimize the hazard of wet-storage stains during shipment and storage. However, the inhibiting characteristics of the treatment are limited and if a shipment is received wet, the material shall be used immediately or dried.
5 Dimension and shape tolerances
5.1 Thickness
Sheet thickness shall conform to the dimensions specified in Table 4. The thickness of the sheet includes both the base metal and the coating.
5.2 Length
Permissible variations in the length of cut-length sheets, both flat and corrugated, shall be in accordance with ISO 16163.
5.3 Flatness
Permissible variations in the width and camber of flat sheet material shall be in accordance with ISO 16163. The flatness tolerances are given in Table 5.
5.5 Chemical composition
An analysis of each heat shall be made by the manufacturer to determine conformity with the requirements of Table 1.
5.6 Mechanical properties
One representative sample from each lot of 50 tons or less shall be used for the tensile test to determine conformity with the requirements of Table 2. Mechanical property tests shall be conducted on the sheet prior to corrugating or other fabrication, whenever possible. If the tests are made after corrugating, the specimens shall be taken on the tangents of corrugations and used for the determination of tensile and yield strength only.
5.7 Coating tests
5.7.1 Coating mass
Test specimens shall be taken from each lot from a sample piece approximately 300 mm in length by the as-coated width. Three specimens are cut from the sample, one from the mid-width position and one from each side, not closer than 25 mm from the side edge. The minimum specimen area shall be 1 200 mm 2 .
5.7.2 Triple-spot test
The triple-spot test result shall be the average coating mass found on the three specimens taken according to 5.7.1.
5.7.3 Single-spot test
The single-spot test result shall be the minimum coating mass found on any one of the three specimens used for the triple-spot test (see 5.7.2).BS ISO 16172 pdf download