Microscopic close-up of mild steel sheet metal. Countless everyday objects are fabricated from sheet metal. Sheet metal is available in flat pieces or coiled strips. In most of the world, sheet metal thickness is consistently specified types of sheet metal pdf millimeters.
The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge. Parts manufactured from sheet metal must maintain a uniform thickness for ideal results. Grade 304 is the most common of the three grades. Grade 303 is not available in sheet form.
Grade 316 possesses more corrosion resistance and strength at elevated temperatures than 304. The only available finish is dull. Grade 430 is popular grade, low cost alternative to series 300’s grades. This is used when high corrosion resistance is not a primary criteria. Common grade for appliance products, often with a brushed finish.
1100-H14, 3003-H14, 5052-H32, and 6061-T6. Grade 1100-H14 is commercially pure aluminium, highly chemical and weather resistant. Grade 3003-H14 is stronger than 1100, while maintaining the same formability and low cost. It is corrosion resistant and weldable. Grade 5052-H32 is much stronger than 3003 while still maintaining good formability.
It maintains high corrosion resistance and weldability. It is weldable, corrosion resistant, and stronger than 5052, but not as formable. It loses some of its strength when welded. It is used in modern aircraft structures. In particular, it does not explain the difference among the various gauge standards like Manufacturers’ Standard Gauge, Standard Decimal Gauge, US Standard Gauge, Birmingham Gage and British Standard Gauge and their appropriate application. Use of gauge numbers to designate sheet metal thickness is discouraged by numerous international standards organizations.
For example, ASTM states in specification ASTM A480-10a: “The use of gauge number is discouraged as being an archaic term of limited usefulness not having general agreement on meaning. Manufacturers’ Standard Gauge for Sheet Steel is based on an average weight of 41. The tolerances in the table and attachments reflect current manufacturing practices and commercial standards and are not representative of the Manufacturer’s Standard Gauge, which has no inherent tolerances. The curling process is used to form an edge on a ring. This process is used to remove sharp edges.
It also increases the moment of inertia near the curled end. It is used to curl a material of specific thickness. Tool steel is generally used due to the amount of wear done by operation. It is a metal working process of removing camber, the horizontal bend, from a strip shaped material. It may be done to a finite length section or coils. It resembles flattening of leveling process, but on a deformed edge.