>> Download table: Brass Forgings, Stampings and Hot Pressings—Compositions, Properties and Standards
Brass forgings, stamping and hot pressings are one of the quickest and most cost-effective ways for the production of finished components in copper-based alloys. From high volume, mass produced components such as plumbing fittings, to more bespoke one-off items, selecting a forged or stamped brass component can often be the best solution for many applications.
Forged copper and copper alloy component production is covered by two BS EN standards, according to the stage/method of manufacturing. Firstly, there is BS EN 12165 – Copper and copper alloys wrought and unwrought forging stock. This covers the composition and manufacture of material that is generally intended for further processing or forging. The second, BS EN 12420 – Copper and copper alloy forgings is used for finished and semi-finished components. This standard can be used to control properties and processing of items produced by hot forging, hammering or pressing. This includes die forging, hand forging, forging between open dies and cored forging.
Both standards contain essentially the same grades of brass material and detail chemical compositions as per the table below. However, as the BS EN 12165 has been written with further processing in mind, it does not have the specific tolerance requirements, detail on manufacturing processes, or the mechanical properties required in BS EN 12420.
Brass grades within these standards obviously need to offer good hot workability/formability at the very least, but the inherent fabrication properties of brass ensure there is a good selection of grades and properties available. Alloy types found within these standards include the binary brasses of copper and zinc such as basis brass CW508L and the leaded brasses including stamping brasses such as CW617N. There are also the more complex grades available such as the high tensile brasses and enhanced corrosion resistance alloys such as CW712R naval brass or CW602N dezincification resistant (DZR) brass.
Compositions given are the EN materials appropriate to designation number. Composition ranges may be outside those of previous BS specifications, therefore compliance should be checked before assuming suitability for applications. The compositions are shown as either a range or maximum for individual elements. Note that not all elements listed as impurities are shown here. For the full chemical composition you should refer to the standard or the Copper and copper alloys. Compendium of compositions and products PD CEN/TS 13388.
This table includes brasses previously included in BS 2872 ‘Specification for copper and copper alloy forging stock and forgings’.
These brasses are now included in the following EN standards for individual product forms:
- EN 12420 ‘Copper and copper alloys—Forgings’
- EN 12165 ‘Copper and copper alloys—Wrought and unwrought forging stock’
In the Table below, the mechanical properties are taken from EN 12420. Tensile properties are for information only. Hardness values in EN 12165 may be slightly different and are given as minima.
For more detail, the appropriate standard(s) should be consulted. Visit our page with details of standards and links to the BSI shop.
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