ASTM A653:17 pdf download

ASTM A653:17 pdf download.Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-lron Alloy-Coated (Galvannealed) by the Hot-Dip Process.
3.2.2. 1 Discussion—The single side relationship of either specified “coating designation” is the same as shown in the note of Table I regarding uniformity of coating.
3.2.3 high strength low alloy steel, n—a specific group of sheet steels whose strength is achieved through the use of microalloying elements such as columbium (niobium), vanadium, titanium, and molybdenum resulting in improved formability and weldability than is obtained from conventional carbon-manganese steels.
3.2.3.1 Discussion—Producers use one or a combination of rnicroalloying elements to achieve the desired properties. The product is available in two designations, HSLAS and HSLAS-F. Both products are strengthened with microalloys, hut HSLAS-F is further treated to achieve inclusion control.
3.2.4 minimized spangle, n—the finish produced on hot-dip zinc-coated steel sheet in which the grain pattern is visible to the unaided eye, and is typically smaller and less distinct than the pattern visible on regular spangle.
3.2.4. I Discussion—T his finish is produced by one of two methods: either (1) the zinc crystal growth has been started hut arrested by special production practices during solidification of the zinc, or (2) the zinc crystal growth is inhibited by a combination of coating-bath chemistry plus cooling during solidification of the zinc. Minimized spangle is normally produced in coating designations 090 [Z275] and lighter.
3.2.5 regular spangle, n—the finish produced on hot-dip zinc-coated steel sheet in which there is a visible multifaceted zinc crystal structure.
3.2.5.1 Discussion—Solidification of the zinc coating is typically uncontrolled, which produces the variable grain size associated with this finish.
3.2 . solid-solution hardened steel or solution hardened steel, n—steel sheet strengthened through additions of substitutional alloying elements such as Mn, P, or Si.
3.2.6.1 Discussion—Substitutional alloying elements such as Mn. P. and Si can occupy the same sites as iron atoms within the crystalline structure of steels. Strengthening arises as a result of the mismatch between the atomic sizes of these elements and that of iron.
3.2.7 spangle-free, n—the uniform finish produced on hot- dip zinc-coated steel sheet in which the visual spangle pattern. especially the surface irregularities created by spangle formation, is not visible to the unaided eye.
3.2.7.1 Discussion—This finish is produced when the zinc crystal growth is inhibited by a combination of coating-bath chemistry, or cooling, or both during solidification of the zinc.
3.2.8 zinc-iron alloy, n—a dull grey coating with no spangle pattern that is produced on hot-dip zinc-coated steel sheet.
3.2.8.1 Discussion—Zinc-iron alloy coating is composed entirely of inter-metallic alloys. It is typically produced by subjecting the hot-dip zinc-coated steel sheet to a thermal treatment after it emerges from the molten zinc bath. This type of coating is suitable for immediate painting without further treatnient except normal cleaning (refer to Guide D7396). The lack of ductility of the alloy coating presents a potential for powdering, etc.