ⅠPhysical and chemical properties
1 Purity: W≥99.95%;
2 Density: ≥19.0g/cm3;
3 Flatness: ≤2%;
ⅡMeasurements and tolerances
|
Thickness
|
Thickness tolerance
|
Width
|
Width
tolerance
|
Length
|
Length tolerance
|
Delivery condition
|
|
＜0.2
|
±0.02
|
10~150
|
±2
|
500
|
±2
|
Cold rolled
|
|
0.3
|
±0.03
|
10~250
|
±2
|
500
|
±2
|
Cold rolled
|
|
0.4
|
±0.04
|
10~250
|
±2
|
500
|
±2
|
Cold rolled
|
|
0.5
|
±0.05
|
10~300
|
±2
|
500
|
±2
|
Cold rolled
|
|
0.8
|
±0.07
|
10~300
|
±0.5
|
500
|
±0.5
|
Cold rolled
|
|
1.0
|
±0.08
|
10~300
|
±0.5
|
600
|
±0.5
|
Cold rolled
|
|
1.5
|
±0.12
|
10~400
|
±0.5
|
600
|
±0.5
|
Cold rolled
|
|
2.0
|
±0.12
|
10~500
|
±0.5
|
700
|
±0.5
|
Cold rolled
|
|
3.0
|
±0.20
|
10~500
|
±0.5
|
600
|
±0.5
|
Hot rolled
|
|
4.0
|
±0.30
|
10~500
|
±0.5
|
600
|
±0.5
|
Hot rolled
|
|
≥5.0
|
±0.40%
|
10~550
|
±0.5
|
600
|
±0.5
|
Hot rolled
|
Special sizes can be manufactured based on customers' requirements
Ⅲ Manufacture process and Equipment
|
Item
|
Process
|
Equipment
|
Quality check point
|
|
|
|
|
1 Physical and chemical properties
|
|
1
|
Tungsten billet
|
|
2 Measurements of sheet billet
|
|
2
|
Check
|
|
3 Surface quality
|
|
|
|
|
4 Unit net weight of billet material
|
|
3
|
Hot rolled
|
Hot mill
|
1 Measurements (thickness , width)
|
|
4
|
Annealing
|
Anneal furnace
|
2 Side crack, stratification for top
|
|
5
|
Alkali wash
|
Alkali bath furnace
|
3 Skew rolling
|
|
6
|
Check
|
|
4 Flatness
|
|
7
|
Warm rolled
|
Four –high cold mill
|
1 Measurements (length, width and thickness)
|
|
8
|
Annealing
|
Anneal furnace
|
2 Side crack, bubbles on surface, uneven on surface
|
|
9
|
Check
|
|
3 Flatness
|
|
10
|
Cold rolled
|
Four –high cold mill
|
1 Density
|
|
11
|
cut
|
Hydraulic plate shears
|
2 Measurements (length, width, and thickness)
|
|
12
|
annealing
|
Vacuum annealing furnace
|
3 Surface quality , bubble on surface,
|
|
13
|
machining
|
Wire cutting machine
|
4 Roll mark, stress, Flatness
|
|
14
|
check
|
Flat-stone mill
|
5 Quality standard: GB/T3875-2006
|
|
15
|
package
|
|
6 Show certificate of quality
|