
|
National
Standard |
Chemical composition(Mass Point) % | |||||||||||
|
Mg≥ |
Impurities≤ | |||||||||||
|
Fe |
Si |
Ni |
Cu |
Al |
Mn |
Cl |
Ti |
Pb |
Zn |
Other elements | ||
|
GB/T 3499—2003 |
Mg9998 |
0.002 |
0.003 |
0.0005 |
0.0005 |
0.004 |
0.002 |
0.002 |
0.001 |
0.001 |
— |
0.005 |
|
Mg9995 |
0.003 |
0.01 |
0.001 |
0.002 |
0.01 |
0.01 |
0.003 |
— |
— |
0.01 |
0.005 | |
|
Mg9990 |
0.04 |
0.02 |
0.001 |
0.004 |
0.02 |
0.03 |
0.005 |
— |
— |
— |
0.01 | |
|
Mg9980 |
0.05 |
0.03 |
0.002 |
0.02 |
0.05 |
0.05 |
0.005 |
— |
— |
— |
0.05 | |
|
1﹞The content of magnesium will be the sum of impurities deducted from 100%。
2﹞Other elements were refer to the symbols of the elements listed in this table, but actually prescribed limit value.
3) The value repairs approximately acts according to the GB/T 8170 regulations to carry on. Limiting value's expression and the determination carry on according to the GB/T 1250 stipulations. | ||||||||||||