6351 6 series aluminum alloy in a higher strength, higher strength than the 6061 alloy, slightly lower than the 6082 alloy, such as 6351-T6 profile requires a minimum tensile strength of 295Mpa, extrusion resistance, 6351 aluminum alloy multi-purpose extruded structural materials in highway transportation facilities and high material strength needed gas, oil and water pipelines. 6351 aluminum alloy chemical composition of aluminum (Al) balance, zinc (Zn) ≤0.20, titanium (Ti) ≤0.20, silicon (Si) 0.7 ~ 1.3, iron (Fe) 0.000 ~ 0.500, manganese (Mn) 0.40 ~ 0.8, magnesium (Mg) 0.40 ~ 0.8, copper (Cu) ≤0.10 Note: Single: ≤0.05 Total: ≤0.15 Aluminum state and Symbol Description 1. Scope: This standard specifies the state of deformation of aluminum alloy code. This standard applies to aluminum and aluminum products. 2. Basic Principles 2.1 Basic state code with a capital letter. 2.2 Subdivision state code uses basic state code followed by one or more Arabic numerals. 2.3 Basic state code divided into five kinds of basic state Code Name Description and Application F free processing state applies in the molding process, hardening and heat treatment conditions for no special requirements for products, the mechanical properties of the state of the product is not specified. O annealed condition applies fully annealed to obtain a minimum strength of processed products. H hardening state applies through hardening to increase the strength of the product, the product may be subjected to after hardening (or not been) reduced the strength of the additional heat treatment. W solid solution heat treatment processing status of an unstable state, only apply to the solution heat treatment, the natural aging of the alloy at room temperature, the state code only that the product is natural aging stage. T heat treatment (unlike F, O, H state) applied to the heat-treated, after (or without) hardening to achieve a stable product. T code must be followed by one or more digits. In the first digit represents the back of the T heat treatment basic types (from 1 to 10), followed by the digits represent change in the heat treatment details. Such as the 6061-T 62; 5083-H 343 and so on. Surface treatment of aluminum alloy sheet aluminum surface treatment by non-paint products and paint can be divided into two major categories of products. 1) non-paint products (1) can be divided into aluminum hammer (irregular pattern), embossing plate (regular patterns) and pre-passivated aluminum surface processing board. (2) This item is not painted on the plate surface treatment, the surface appearance of the less demanding lower prices. 2) paint products (1) Category: Press the coating process can be divided into: Spray board products and pre-roll coating plate; can be divided according to the type of paint: polyester, polyurethane, polyamide, modified silicone, epoxy resins, fluorocarbon and the like. (2) a variety of coatings, the main performance difference is resistance to ultraviolet sunlight, which in front of the most commonly used coating is fluorocarbon (PVDF), a strong resistance to UV its capacity; the back of the optional polyester or epoxy resin as a protective lacquer coating. Also front protective film can be attached tear-away.