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Chapter GROUP 3H

Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below:

Metals, Minerals and their Manufactures

In this Group, the following definitions apply

  • “crude forms” means anodes, balls, bars (including notched bars and wire bars), billets, blocks, blooms, brickets, cakes, cathodes, crystals, cubes, dice, grains, granules, ingots, lumps, pellets, pigs, powder, rondelles, shot, slabs, sponge, sticks;

  • “semi-fabricated forms” means (whether or not coated, plated, drilled or punched)–

  • (i) in the form of wrought or worked materials fabricated by rolling, drawing, extruding or grinding, (i.e. angles, channels, circles, discs, dust, flakes, foils and leaf, forging, plate, powder, pressings and stampings, ribbons, rings, rods (including bare welding rods, wire rods, and rolled wire), sections, shapes, sheets, strip, pipe and tubes (including tube rounds, squares, and hollows), drawn or extruded wire);

  • (ii) cast material produced by casting in sand, die, metal, plaster or other types of moulds, including high pressure castings, sintered forms and forms made by powder metallurgy.

PL7025

Pyrolitic deposition technology and specially designed components related thereto, the following–

  • (a) Technology relating to the production of pyrolitically derived materials formed on a mould, mandrel or other substrate from precursor gases which decompose in the 1,573K (1,300°C) to 3,173K (2,900°C) temperature range at pressures of 130Pa to 20kPa

B

  • (b) Nozzles specially designed for any of the processes referred to in head (a) A

IL1610

Metal alloys, metal alloy powder or alloyed materials, the following: except metal alloys, metal alloy powder or alloyed materials for coating substrates–

  • (a) Metal alloys, the following: when made from a metal alloy powder or particulate material specified in head (b) below–

  • (1) Nickel alloys with a stress-rupture life of 10,000 hours or longer at 923K (650°C) and at a stress of 550MPa

C

  • (2) Cobalt alloys with a stress-rupture life of 10,000 hours or longer at 923K (650°C) and at a stress of 400MPa

C

  • (3) Niobium alloys with a stress-rupture life of 10,000 hours or longer at 1,073K (800°C) and at a stress of 400MPa

C

  • (4) Titanium alloys with a stress-rupture life of 10,000 hours or longer at 723K (450°C) and at a stress of 200MPa

C

  • (5) Aluminium alloys with a tensile strength of–

  • (A) 240MPa or more at 473K (200°C)

C

or

  • (B) 415MPa or more at 298K (25°C)

C

  • (6) Magnesium alloys with a tensile strength of 345MPa or more and a corrosion rate of less than 1mm/year in 3% sodium chloride aqueous solution measured in accordance with ASTM standard G–31 or national equivalents

C

  • (b) Metal alloy powder or particulate material having both of the following characteristics

C

  • (1) Made from any of the following composition systems–

  • (A) Nickel alloys (Ni-Al-X or Ni-X-Al);

  • (B) Cobalt alloys (Co-Cr-X or Co-X-Cr);

  • (C) Niobium alloys (Nb-Al-X or Nb-X-Al), Nb-Si-X or Nb-X-Si, Nb-Ti-X or Nb-X-Ti);

  • (D) Titanium alloys (Ti-Al-X or Ti-X-Al);

  • (E) Aluminium alloys (Al-Mg-X or Al-X-Mg), Al-Zn-X or Al-X-Zn, Al-Fe-X or Al-X-Fe); or

  • (F) Magnesium alloys (Mg-Al-X or Mg-X-Al);

(Note: X equals one or more alloying elements.)
and

  • (2) Made in a controlled environment by any of the following processes–

  • (A) Vacuum atomisation;

  • (B) Gas atomisation;

  • (C) Rotary atomization;

  • (D) Splat quenching;

  • (E) Melt spinning and comminution;

  • (F) Melt extraction and comminution; or

  • (G) Mechanical alloying.

  • (c) Alloyed materials, in the form of uncomminuted flakes, ribbons or thin rods produced in a controlled environment by splat quenching, melt spinning or melt extraction, used in the manufacture of metal alloy powder or particulate material specified in head (b) above

C

In this entry–

  • metal alloys are those containing a higher percentage by weight of the stated metal than of any other element;

  • stress-rupture life should be measured in accordance with ASTM standardE-139 or national equivalents.

IL1631

Magnetic metals and materials, the following–

  • (a) Those having either of the following characteristics–

  • (i) Initial relative permeability: 120,000 or more and thickness 0.05mm or less

C

  • Note:

  • Measurement of initial permeability must be carried out on materials which are fully annealed.

  • (ii) Remanence: 98.5% or over of maximum magnetic flux for materials having magnetic permeability

C

  • (b) Grain-oriented iron alloy sheets or strips of a thickness of 0.1mm or less

C

  • (c) Magnetostrictive alloy having either of the following characteristics–

  • (1) saturation magnetostriction more than 5 × 10−4 ;

C

or

  • (2) magnetomechanical coupling factor (k) more than 0.8

C

  • (d) Amorphous alloy strips having both of the following characteristics–

C

  • (1) composition having a minimum 75 per cent by weight of one or more of the elements iron, cobalt and nickel; and

  • (2) saturation magnetic induction (Bs) of 1.6tesla or more, and either–

  • (i) strip thickness of 0.020mm or less; or

  • (ii) electrical resistivity of 2 × 10−4 ohm-cm or more.

IL1672

Nickel or titanium-based alloys in the form of aluminides, in crude or semi-fabricated forms, the following: and scrap thereof–

  • (a) Nickel aluminides containing 10 per cent or more by weight of aluminium

C

  • (b) Titanium aluminides containing 12 per cent or more by weight of aluminium

C

IL1675

Superconductive materials and composite conductors, the following–

  • (a) Superconductive materials of all types, the following

C

  • (1) ving a critical temperature, at zero magnetic induction, of 9.85K or higher; and

  • (2) in quantities of more than 25g;

  • (b) Superconductive niobium-titanium wire not embedded in a metallic matrix with a cross section area of less than 3.14 × 10−4 mm2 (ie. 20 micrometre diameter for circular filaments)

C

  • (c) Composite conductors containing at least one superconductive constituent having a critical temperature, at zero magnetic induction, of 9.3K or higher

C

  • except–

  • such conductors which–

  • (1) have superconductive filaments embedded in a copper or copper-based mixture matrix; and

  • (2) have either of the following two sets of characteristics–

  • (A) the superconductive constituent or filament–

    • (a) has a cross section area of more than 3.14 × 10−4 mm2 (ie. 20 micrometre diameter for circular filaments);

    • (b) is either non-coated, or insulated with–

    • (1) varnish;

    • (2) glass fibre;

    • (3) polyamide; or

    • (4) polyimide; and

    • (c) does not remain in the superconductive state when–

    • (1) evaluated in sample lengths of less than 1m; and

    • (2) exposed to a magnetic field with an induction of more than 12tesla at a temperature of 4.2K (−268.95°C); or

  • (B) the composite conductor contains–

    • (a) superconductive niobium-titanium wire with a cross section area of more than 9.5 × 10−5 mm2 (ie. 11 micrometre diameter for circular filaments); and

    • (b) a total mass (including the mass of the matrix) not exceeding 10kg.

In this entry–

  • “superconductive” means materials (ie. metals, alloys or compounds) which can lose all electrical resistance, ie. which can attain infinite electrical conductivity and carry very large electrical currents without Joule heating. The superconductive state of a material is individually characterised by a critical temperature, a critical magnetic field which is a function of temperature, and a critical current density which is a function of both magnetic field and temperature;

  • “critical temperature” means the temperature at which the material loses all resistance to the flow of direct current. Critical temperature (sometimes referred to as the transition temperature) is of a specific superconductive material.

PL7035

Tungsten and alloys of tungsten, in the form of uniform spherical or atomised particles of 500micrometre diameter or less with a purity of 97% or greater

A

PL7036

Molybdenum and alloys of molybdenum, in the form of uniform spherical or atomised particles of 500micrometre diameter or less with a purity of 97% or greater

A

PL7001

Aluminium alloys, the following: tubes, bars or forged forms having an outside diameter greater than 75mm and less than 400mm and a tensile strength of460 × 106 N/m2 or greater

W

PL7002

Maraging steels (steels generally characterised by high nickel, very low carbon content and the use of substitutional elements to produce age-hardening), whether or not finally heat treated, having either of the following characteristics–

  • (a) Capable of ultimate tensile strength of 1.5 × 109 Pa or greater, measured at 20°C, in the form of sheet, plate or tubing with a wall or plate thickness equal to or less than 5.0mm (0.2inch);

A

  • or

  • (b) Capable of ultimate tensile strength of 2.049 × 109 Pa or greater, measured at 20°C, in the form of sheet, bar or tubing or having three orthogonal dimensions of 75mm or greater

A

PL7012

Tantalum (or Tantalum lined) crucibles for casting actinide metals

W