1.Range Ammonium metatungstate national standard stipulates the requirement, test method, detection rule, sign, packing, transportation, storage, quality certificate and contract (or order) content. 
This standard is applied for ammonium metatungstate used in petroleum chemical industry and deep processing of tungsten industry.

2.Requirement 
2.1 Product classification 
According to different producing method, ammonium metatungstate can be sorted into two grade: AMT-P and AMT-J, AMT-P is produced by spray method, AMT-J is produced by crystallization method. 
2.2 Chemical component: 

2.3 Water insoluble matter 
Under room temperature, water soluble matter tested by WO3 content 650g/L solution is less than 0.05%. 
2.4 PH value 
Under room temperature, PH value tested by WO3 content 650g/L solution is less than 4.5. 
2.5 Appearance quality 
The product is white powder of light yellow crystal, under visual contact there is no inclusion or agglomeration.

3.Test method 
3.1 Chemical component test is processed under provision GB/T 4324. 
3.2 Water insoluble matter test is processed under provision GB/T 23368.1. 
3.3 PH value is tested by PH meter. 
3.4 Appearance quality is tested by visual contact.


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Broad Jump tungsten dart rule is a very unique style of game similar only to it's cousin, High Jump. It may be played by any number of players or teams and is a good game to play with an odd number of people.

The Object: The object of the game is to "jump" further than your opponents.

The Scoring: Players names are written in order down the left side of the scoreboard. Order is usually determined by throwing one dart each at bulls-eye. Closest to the bulls-eye throws first, farthest throws last.

The Play: Each player in turn throws three darts trying to advance the target numbers to make the longest "jump". The targets are across the center of the board in order: Double-11, Large-11, Triple-11, Small-11, Bulls-eye, Double-Bulls-eye, Bulls-eye, Small-6, Triple-6, Large-6, Double-6.

For a dart to count, the targets must be hit in order, one dart each. Play begins with the Double-11, once the Double-11 is hit the player may now throw at Large-11 and so on across the board.

After the each player throws all three tungsten darts, the "furthest" target that was hit becomes the length of the jump and is written next to the player's name and play continues with the next player. The next time that player throws again, the target number is the next number after the old target. This means that each round extends the length of the jump.

If the player misses the target with all three tungsten darts, that player's jump is over and the last target that was hit becomes the final length of the jump. That player does not throw again.

After all players have missed their target with three tungsten darts, whoever's jump was longest wins the game. If more than one player has the same length jump at the end of the game or both made it all the way across the board, those players alone should play again to break the tie.

Strategy: Take your time and concentrate when you get to the bulls-eye area. They are hard to hit, but if you get past them, it's all down hill from there.
 

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It is forbidden cracks and visible pits and holes on the surface of tungsten carbide ball, and the measurement and test methods also has rules:

1. For the size and shape tolerance of tungsten carbide ball measuring, it is based on the rules of CB/T 308.

2. For the surface toughness of tungsten carbide ball measuring, it is based on the rules of GB/T 10610.

3. The test of appearance is supposed to be observed under the floodlight.

4. Physical and mechanical properties test: Rockwell hardness testing follows the rules of CB/T 3849; porosity, non-combined carbon and macro pore testing follows the rules of GB/T 3849; and the bending strength testing should follow the rules of GB/T 3851.

In addition, the rule of the sampling of mechanical properties: Rockwell hardness or Vickers hardness testing and microstructure of detection by each batch of products (vacuum sintering furnace for each furnace, arbitration samples per case) to pick two, while picks six (5.25×6.5×20) of each batch in the test of bending strength. If one term does not match the rule of mechanical properties, we should double check and double sampling. If it is still unqualified, we can consider this batch as unqualified products.



















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Tungsten carbide ball shape tolerances, surface roughness, the variation of the batch diameter table as follow:

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Fig.5 shows the critical load as a function of post-annealing temperature for TiN coatings with Co interlayer thickness of 0.027μm showing highest adhesion strength in Fig.3.As post-annealing temperature increases, the critical load value continually increased. Differently from TiN/Ti/WC-Co system, the critical load for TiN/Co/WC-Co system was increased even after post-annealing at 600 °C for 2 h.

Fig. 6 shows optical micrographs of the scratch path near the highest scratch load, before and  after post-annealing at 600 °C for 2 h for the sample with Co interlayer thickness of 0.027μm.  Although some flaking appeared after the point showing the highest load, Lc2 of 84 N (Fig. 6a), this failure behavior is much improved compared to the case without Co interlayer. The post-annealing treatment further improved the failure mode (Fig. 6b). This result is believed to be attributed to the improvement of adhesion property due to heat treatment.

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Fig. 4 shows the frictional force vs. Co interlayer thickness. It was found that the frictional force was largely dependent on the Co interlayer thickness. It is known that the extrinsic parameters directly influencing the scratch test results are tungsten carbide substrate hardness, existence of interlayer, coating thickness, coating hardness, and roughness. However, the existence of interlayer among these parameters is known to be the main parameter influencing the extent of deformation of the coating- substrate assembly. Consequently, the results shown in Figs. 3 and 4 could be explained mainly by the existence of interlayer with different thickness.

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During the World War Ⅱ, tungsten has already been used as an important raw material for military defense. There were abundant wolfram ore reserves found then in Portugal, which were used to produce tungsten concentrates for military defense,tungsten alloy rod is one of the material for military.

Different process methods could offer different rod properties ,if need high ultimate tensile strength and high hardness, tungsten alloy material usually need to be swaged, which are usually used in military field, such as tungsten heavy alloy swaging rod for armor piercing, bullet and hunting shot, tungsten alloy fragments; if they need just sintering, they could be offered as tungsten alloy cube, sphere, ball, etc. for military defense. Sometimes, in order to get a higher property, we usually add some other materials to mix the powder, such as Co, Mo, etc. If it comes to some parts used for navy, coated or electrodeposited chromium could be offered according to protect from saltness corrosion.

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With its high density, tungsten alloy is the  Tungsten is non-toxic, and environmentally friendly materia. Tungsten alloy cubes for military defense can easily replace lead in most cases.

Having more concentrated weight means having more control to achieve the center of mass that you are targeting. Owing to its great hardness and resistance to high temperature, tungsten has been increasingly adopted in military defense increasingly today.

Advantage of Tungsten Alloy Cubes for Military Defense:

1, High-density

2, High absorption capacity against X-rays and gamma rays

3, Good modulus of elasticity

4, High hardness

5,Environment protection standard

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Tungsten is an important element for use in the production of some special steels and is added to steel as ferrotungsten alloys. Low carbon ferrotungsten is mostly produced by the metallothermic reduction process. The aim of this study was to determine ferrotungsten production parameters for the Etibank Scheelite concentrate containing 35% WO₃ by an aluminothermic process. Although tungsten was recovered up to 95.4%, the tungsten content of alloy obtained was a maximum of 52.6% in the aluminothermic processing of tungsten calcine obtained by total oxidizing roasting of the concentrate. Therefore, pre-roasting and magnetic separation treatments were applied to tungsten concentrate to enrich the tungsten content in the non-magnetic part of the concentrate, and the tungsten recovery obtained was 92.5%. After applying total oxidizing roasting to the non-magnetic part of the concentrate to decrease the sulfur content, a calcine containing 50.4% WO₃ was obtained. By aluminothermic reduction of this calcine, tungsten could be recovered at 79.4% and concentrated as 75.4% in the ferroalloy.

 

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