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The process of assigning HS codes is known as "HS Classification". All products can be classified in the HS by using the General Rules for the Interpretation of the Harmonized System ("GRI") that must be applied in strict order. HS codes can be determined by a variety of factors including a product's composition, its form and its function.
The system has a numerical "coding schedule" of 10 digits to code the materials. It consists of groups, sub- and sub-sub-groups of 2 digits each, and a "Buying description" of 3 digits. Local coding is allowed for every company. The last digit for central coded materials is a 1, the last digit for local coded materials is a 9.
Steel Works, Blast Furnaces & Rolling & Finishing Mills 3312 Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) 3317 Steel Pipe & Tubes 3320 Iron & Steel Foundries 3330 Primary Smelting & Refining of Nonferrous Metals 3334 Primary Production of Aluminum 3341 Secondary Smelting & Refining of Nonferrous Metals 3350
These values depend solely on the type/application code given in the first part of the code and are so numerous as to be impossible to indicate here. Additional symbols are separated from the main code by the plus sign (+). The most common additional symbols are the impact and temperature codes for structural steels, category 1 - Sxxx.
Seamless Steel Pipes and Tubes – Dimensions, Conventional Masses per Unit Length: Canceled: DIN EN 10220: EN 10220: DIN 2527: Blank flanges – Nominal pressure 6 to 100: Withdrawn: DIN EN 1092-1: EN 1092-1: DIN 2860: Capillary Fittings; Bends 180° of Copper: Withdrawn: DIN 2982: Steel threaded pipe fittings: Withdrawn: DIN EN 10241: EN ...
Scope of ASTM A53 Standard ASTM A53 is standard specification for pipe, steel, black and hot dipped, zinc-coated, welded and seamless. This specification covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1⁄8 to NPS 26 [DN 6 to DN 650] (Note 1), inclusive, with nominal wall thickness (Note 2) as given in Table X2.2 ...
A heat number is a unique identification coupon number that is stamped on a material plate after it is removed from the ladle and rolled at a steel mill. It serves as a traceable identifier that links the metal product to its specific batch or "heat," allowing access to detailed records about the material's composition, manufacturing process ...
The number system, like Sch 40, 80, 160, were set long ago and seem a little odd. For example, Sch 20 pipe is even thinner than Sch 40, but same OD. And while these pipes are based on old steel pipe sizes, there is other pipe, like cpvc for heated water, that uses pipe sizes, inside and out, based on old copper pipe size standards instead of steel.