1971-HKRS30-16-30_Part07 — Page 11

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ABEC 5, RBEC 5 (or equivalents) or better and either or both of the following characteristics--

(0) Made of special materials, ie. with rings, balls or rollers made from any steel alloy or other material except the following-

Low-carbon steel; SAE-$2100 high carbon chromium steel; SAE-4615 nickel molybdenum steel; or equiv- alents (partial illustrative examples of special materials for this purpose ure: high-speed tool steels; stainless steel; monels; beryllium);

(1) Manufactured for use al normal operating tempera- Lures over 302° F. (150° C) either by use of special materials or by special heal treatment;

(b) AU ball and cylindrical roller bearings (exclusive of separ-

abic ball bearings and thrust ball bearings) having an ioner bore diameter exceeding 10 millimetres and having toler atces of ABEC 7, RBEC 7 (or equivalents) or better and either or both of the characteristics in sub-item (a)) or

1649.

4646.

1649.

1654.

(e) Bearing parts as follows

Outer rings, inner rings, retainers, balls, rollers and sub- assemblies usable only for bearings covered by sub-items (a) and (b).

1658.

1631.

Magnetic metals of all types and of whatever form, possessing one or more of the following characteristiÇS-

4661.

(a) Grain orjented sheet or strip of a thickness of 0.004 inches

(0.1 mm) or less;

(5) Initial permeability 70,000 gausa-oersteds (0.0875 Henry/m)

or overt

1668.

(c) Remanence 98.5% or over of maximum flux for materials

having magnetic permeability:

1635.

(d) A composition capable of an energy product-

(i) Exceeding 8 times 106 gauss-oersteds (63,700 joules/ cum.); or

(i) 4.85 times 106 gauss-versteds (38,600 joules/cu.m.) or greater and having a coercive force of 1,800 oersleds (143,200 amperes/m) or greater.

Iroo and steel, alloyed as follows-

(4) Containing 10% or more molybdenum (but more than 5% molybdenum in any alloys containing more than 14% chromium);

(b) Containing 1,5% or more of either niobium or tantalum or

both;

(c) Nickel bearing stabilized steels, not elsewhere specified having a total of 38% or more of alloying elements except such steels containing less than 0.4% titanium or less than 0.8% niobium-tantalum

(d) Precipitation hardening steels containing 4% or more nickel,

1670.

1671.

1673

Cobalt based alloys (ie. containing a higher percentage by weight of cobalt than of any other element), containing 5% or more of tantaluna,

Cobalt bearing alloys (other than those covered by items 1631, 1635 and 1648) and scrap forms thereof, containing- (a) 50% or more cobalt; or

(8) 19% or more cobalt and 14% or more chromium. Niobium (columbium) as follows-

(2) Raw materials including ores, residue, concentrates, malle,

regulus and droes;

(6) Ferro-olobium and ferro-niobium-tantalum;

(c) Metal and niobium-based alloys containing 50% or more niobium or 60% or more niobium-autalum in combination; (d) Scrap forms of the metal and alloys covered under sub-

item (c).

Magnesium-based alloys containing 0.4% or more of zirconium, or 1% or more of rare earth metals (perium mischmetal), and scrap forms thereof.

Molybdenum metal with a purity of more than 99.5%, and alloys containing 95% or more of molybdenum, except molyb. denum metal wire or molybdenum alloy wire.

Nickel alloys, as follows—

(a) Nickel-chromium alloys containing al least 35% nickel, at least 12% chưremium and at least 1.5% total titaniuma plus aluminium plus columbium, either separately or combined; (8) Nickel-based alloys, not elsewhere specided.

Tungsico metal, as follows-

(a) Pressed-sintered crude and semi-fabricated forms weighing

more than 20 lb. (9 kp) except wire and sheet;

(b) Pressed-sintered porous crude and semi-fabricated forms weighing more than 15 [b. (6.8 kg) before infiltration, or more than 20 lb. (9 kg.) after jafltration.

Tantalum, as follow-

(a) Metal and tantalum-based alloys containing 60% or mort

of tantalum;

(B) Scrap Toms of the metal and alloys covered by sub-

item (a).

Tiladium, as follows-

(a) Metal and titanium-based alloys containing 70% or more

titanium;

(b) Scrap forms of the metal and alloys covered under zub-

item (a).

Artificial graphite having an apparent relative density of 1.90 or greater when compared with water at 60° F. (15.5° C)