Grades Of Copper

Grades of copper and copper alloys are designated by both a symbol and a number system to the current standards BS EN 1172: 1997 and BS EN 1412: 1996.

Thus, for example, phosphorus deoxidised non-arsenical copper, typically used for roofing and cladding would be defined as:

Symbol system:

Cu-DHP with very good welding, brazing and soldering properties.

Number system: CW024A-R240

(C refers to copper, W refers to wrought products, 024A identifies the unique composition -Table 5.10). The subsequent letters and numbers define a specific requirement such as tensile strength or hardness; in this case, a minimum tensile strength of 240 MPa, which is half-hard temper.)

Only four of the numerous grades of copper are commonly used within the construction industry.

Table 5.10 Broad classification of copper alloys

Number series

Letters

Materials

000-099

A or B

copper

100-199

C or D

copper alloys

(less than 5% alloying elements)

200-299

E or F

copper alloys

(more than 5% alloying elements)

300-349

G

copper - aluminium alloys

350-399

H

copper - nickel alloys

400-449

J

copper - nickel - zinc alloys

450-499

K

copper - tin alloys

500-599

L or M

copper - zinc alloys

600-699

N or P

copper - zinc - lead alloys

700-799

R or S

copper - zinc alloys, complex

Notes:

The three-digit number designates each material and the letter indicates copper or the alloy group.

Notes:

The three-digit number designates each material and the letter indicates copper or the alloy group.

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