|
Date |
Change |
|
12 October 2015 |
First issue |
Scope
This specification provides the typical limits and tolerances on chemical, metallurgical and physical quality of RTA’s primary foundry ingot products supplied ex New Zealand Aluminium Smelter (“NZAS”) as defined in Table 1.
Table 1: Product combinations covered by this specification
|
Ingot Alloy |
Ingot Weight (kg) |
|
AA170.9 |
23kg |
|
AA185B |
23kg |
|
CC601E |
23kg |
|
EA401 |
23kg |
Chemical Composition limits
Chemical composition is specified by the alloy code with defined composition limits as detailed below. Furnace charges are sampled and analysed according to methods based on ASTM Standards E716 and E1251. RTA’s alloy analysis is accredited by the National Association of Testing Authorities, Australia (NATA).
Table 2: Chemical composition limits (weight percent)
|
AA170.9 (V4) |
||
|
Element |
Minimum |
Maximum |
|
Aluminium |
99.70 |
|
|
Silicon |
|
0.100 |
|
Iron |
|
0.200 |
|
Copper |
|
0.014 |
|
Manganese |
|
0.024 |
|
Magnesium |
|
0.024 |
|
Chromium |
|
0.024 |
|
Nickel |
|
0.024 |
|
Zinc |
|
0.024 |
|
Titanium |
|
0.024 |
|
Gallium |
|
0.024 |
|
Vanadium |
|
0.024 |
|
Boron |
|
0.024 |
|
Others - each |
|
0.024 |
|
Others - total |
|
0.10 |
|
AA185B (V2) |
||
|
Element |
Minimum |
Maximum |
|
Aluminium |
99.85 |
99.90 |
|
Silicon |
|
0.104 |
|
Iron |
|
0.104 |
|
Copper |
|
0.024 |
|
Manganese |
|
0.034 |
|
Magnesium |
|
0.034 |
|
Chromium |
|
0.034 |
|
Strontium |
|
0.034 |
|
Nickel |
|
0.034 |
|
Zinc |
|
0.034 |
|
Titanium |
|
0.034 |
|
Gallium |
|
0.034 |
|
Boron |
|
0.034 |
|
Vanadium |
|
0.034 |
|
Calcium |
|
0.034 |
|
Sodium |
|
0.034 |
|
Lead |
|
0.034 |
|
Tin |
|
0.034 |
|
Lithium |
|
0.034 |
|
Beryllium |
|
0.034 |
|
Others - each |
|
0.034 |
|
Others - total |
|
0.10 |
|
CC601E (V4) |
|||
|
Element |
Minimum |
Maximum |
Nominal |
|
Silion |
7.0 | 7.5 | 7.2 |
|
Iron |
0.15 | ||
|
Copper |
0.05 | ||
|
Manganese |
0.05 | ||
|
Magnesium |
0.25 | 0.35 | 0.30 |
|
Zinc |
0.05 | ||
|
Titanium |
0.05 | ||
|
Calcium |
0.003 | ||
|
Sodium |
0.005 | ||
|
Strontium |
0.02 | 0.04 | 0.03 |
|
Others - each |
0.05 | ||
|
Others - total |
0.15 | ||
|
EA401 (V2) |
|||
|
Element |
Minimum |
Maximum |
Nominal |
|
Silion |
11.5 | 12.5 | 12.0 |
|
Iron |
0.10 | 0.20 | 0.15 |
|
Copper |
0.10 | ||
|
Manganese |
0.02 | ||
|
Magnesium |
0.02 | 0.05 | 0.03 |
|
Nickel |
0.02 | ||
|
Zinc |
0.10 | ||
|
Titanium |
0.15 | ||
|
Calcium |
0.005 | ||
|
Sodium |
0.008 | ||
|
Others - each |
0.05 | ||
|
Others - total |
0.15 | ||
Metallurgical Quality
Ingots shall contain a minimal amount of porosity, oxides and dross. The ingots will contain some porosity and the buyer must adequately preheat and dry ingot before charging it into the furnace. As a guide this is done by preheating the ingot to 400oC for at least 4 hours. Heating for 2 hours per 25mm of section thickness is typically required to bring Aluminium to a uniform temperature.
Physical Quality
Ingots shall have smooth finish on bottom and side surfaces with no included or adhered refractory coating material. Surfaces shall be free from adhered corrosion product and contaminants such as powders and hydrocarbons
Packing and Marking
Ingots shall be fastened in a bundle with steel or plastic straps. The package shall be suitable for handling by forklift. The cast number shall be marked on each ingot using inkjet marking and each bundle shall have a self-adhesive label showing cast number, lot number and weight.
A manifest shall be supplied with each order of ingot providing the alloy code, cast number, chemical analysis and weight details of the product.