GALVANIZED STEEL PIPE A53B/A123 By HORNG CHEN STEEL PIPE CO., LTD.,

La description

Galvanizing Specifications

Hot-dip galvanizing is done in accordance with long established specifications. There are three main specifications (A**3, A**3, and A**7) governing the coating thickness, adherence, and finish for hot-dip galvanized steel and a handful of supporting specifications referenced in these specifications; cover design practices, repair and touch-up, and painting/powder coating over galvanizing.

Specifications

Specifying hot-dip galvanizing is simply done by using specifications developed to produce high-quality galvanized coatings. The main specifications that pertain to hot-dip galvanizing are:

A**3 - general iron and steel products
A**3 - small parts
A**7 - reinforcing steel (rebar)

A**3

A**3 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products covers the requirements for galvanizing by the hot-dip process on iron and steel products made from rolled, pressed, and forged shapes, castings, plates, bars, and strips. It covers both un-fabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from uncoated steel wire. This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged (or otherwise handled to remove excess galvanizing bath metal). A**3 does not apply to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines. The specification includes minimum coating thicknesses according to material category as well as finish and adherence requirements.

A**3

A**3 Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware, covers zinc coatings applied by the hot-dip process on iron and steel hardware. It is intended to be applicable to hardware items that are centrifuged or otherwise handled to remove excess zinc. A**3 also contains information on minimum coating thickness as well as finish and adherence requirements.

A**7

A**7 Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement, covers zinc coatings applied by the hot-dip process on individual steel reinforcing bars before fabrication used in concrete. The specification says bars shall have NO bare spots and shall be free from tears or sharp spikes which make the bar hazardous to handle, and bars that stick together after galvanizing shall be rejected. Minimum bend diameters for finished bars are included in the specification to prevent the coating from flaking on bend radii, as are requirements for coating thickness according to bar size. All rebar fabrications shall be galvanized to the requirements of A**3.

A*3/A*3M**2

Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

Abstract

This specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS *6. The steel categorized in this standard must be open-hearth, basic-oxygen or electric-furnace processed and must have the following chemical requirements: carbon, manganese, phosphorus, sulfur, copper, nickel, chromium, molybdenum, and vanadium. The tubing shall undergo a seamless or welding process. Tension, bend, and flattening tests shall be performed to make sure that it must adhere to the mechanical properties of the standard. The hydrostatic test shall be applied, without leakage through the weld seam or the pipe body. Nondestructive electric test shall be made to make sure that the full volume of the pipe must be in accordance with the standard. The purchaser shall have the right to perform any of the inspections and tests set forth in this specification where deemed necessary to ensure that the pipe conforms to the specified requirements.

Scope

1.1 This specification2 covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS *6 [DN 6 to DN **0] (Note 1), inclusive, with nominal wall thickness (Note 2) as given in Table X2.2 and Table X2.3. It shall be permissible to furnish pipe having other dimensions provided that such pipe complies with all other requirements of this specification. Supplementary requirements of an optional nature are provided and shall apply only when specified by the purchaser.

NOTE 1: The dimensionless designators NPS (nominal pipe size) [DN (diameter nominal)] have been substituted in this specification for such traditional terms as nominal diameter, size, and nominal size.

NOTE 2: The term nominal wall thickness has been assigned for the purpose of convenient designation, existing in name only, and is used to distinguish it from the actual wall thickness, which may vary over or under the nominal wall thickness.

1.2 This specification covers the following types and grades:

1.2.1 Type F—Furnace-butt-welded, continuous welded Grades A and B,

1.2.2 Type E—Electric-resistance-welded, Grades A and B, and

1.2.3 Type S—Seamless, Grades A and B.

NOTE 3: See Appendix X1 for definitions of types of pipe.

1.3 Pipe ordered under this specification is intended for mechanical and pressure applications and is also acceptable for ordinary uses in steam, water, gas, and air lines. It is suitable for welding, and suitable for forming operations involving coiling, bending, and flanging, subject to the following qualifications:

1.3.1 Type F is not intended for flanging.

1.3.2 When pipe is required for close coiling or cold bending, Grade A is the preferred grade; however, this is not intended to prohibit the cold bending of Grade B pipe.

1.3.3 Type E is furnished either nonexpanded or cold expanded at the option of the manufacturer.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.5 The following precautionary caveat pertains only to the test method portion, Sections 7, 8, 9, *3, *4, and *5 of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory requirements prior to use.

1.6 The text of this specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.

1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Pays:	Taiwan
N Â° de modÃ¨le:	GALVANIZED ZINK THICKNESS FROM 500-610 G/M2
Prix FOB:	900 ~ 1200 / Metric Ton ( Negotiable ) (Negotiable) Obtenir le dernier prix
LocalitÃ©:	TAIWAN, CHINA, JAPAN, GERMANY
Prix de commande minimale:	900 per Metric Ton
Commande minimale:	10 Metric Ton
Packaging Detail:	STANDARD EXPORTS PACKING
Heure de livraison:	15-20 DAYS UPON ORDER
Capacité de Fournir:	20000 Metric Ton per Year
Payment Type:	L/C, T/T
Groupe de produits :	Carbon Steel