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OCR for page 197
Appendix H
TITANIUM SPONGE SPECIFICATIONS
The following material is an excerpt from U. S. National Stockpile
Purchase specification P-97-~7 June 2, 1982 (supersedes P-97-R6,
October l9, 1977~:
This specification covers titanium metal sponge in the form and
quality satisfactory for stockpiling and intended industrial uses.
COMICAL AND PHYSICAL REQUIREMENTS
Each lot of titanium purchased under this specification shall be
uniform in appearance and thoroughly blended . It shall be free of
inclusions, oxides, nitrides, and other contaminants , and shall have
a uniform matte gray color. Deviations from this color, such as
bluish or yell owish hues, may indicate the Dresence of excessive
amounts of impurities and the need for micro-samples to be taken for
chemical analysis. The material purchased shall conf arm to the
following applicable chemical and physical requirements:
A. Chemical Requirements:
Element
Percent by Weight
(dry Basisja
-
Grade lA~Ou
Grade lB-O v
-
Type A
l
Type A Type B Type C
Nitrogen Max. 0.010 OeO15 OeO15 OeO08
Carbon Max. 0.020 0.025 0.020 0.020
Sodium
(total) Max. - - 0.19 0.01
Magnesium Max. 0.08 0.50 0.08
Lithium Max. - - - 0.09
Potas slum Max .
Al''minum Max. - O.07
Chlorine Max. O . 10 0.20 0.20 0.10
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198
Chemical Requirements (continued ):
E1 event
-
Percent by Weight
(Dry Basis)a
Grade 1A - b Grade lB-°h
Type A Type B Type C Type A
Iron Max. 0.08 0.10 0.04 0.04
Silicon Max . O . 04 0 . 04 0 .04 0 .04
Hydrogen Max. 0.005 O. 03 0.05 0.02
Oxygen Max. 0.10 0.10 0.10 0.07
Water Max. 0.02 0.02 0.02 0.02
All other elements
(total) Max. 0.05 0.05 0.05 0.05
Titanium
(nominally) Min. 99.6 99.1 99.3 99 .6
a The sample shall be dried f or 2 hours at 135°C.
b Type A Magnesium reduced and finished by vacuum distillation.
Type B Magnesium reduced and finished by acid leaching or inert gas
sweep distillation.
Type C Sodium reduced and finished by acid leaching.
B. Physical Requirements:
Hardness (BHN):
The maximum Brinell hardness of each lot of Type A and Type D
titanium shall be 100, and each lot of Type B and Type C titanium
shall be 120.
The Brinell hardness of a lot shall be the average of the hardness
determinations made on button representing the lot of titanium.
However, no batch having a Brinell hardness more than 10 points above
the maximum allowable for the lot shall be used in blending for that
lot . The method of measurement shall be in accordance wi th ASTM
Method E10, Test for Brinell Hardness of Metallic Materials, using a
lO~m ball, 1500-kg f load in the 100 to 200 Bhn range and a 500-kg f
load in the under 95 Bhn range and a 30-s dwell.
No te: P-9 7-R7 also contains Section III on Packaging, Marking,
Identif ication, Shipping and Handling .
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199
The following material is an excerpt from ASTM B-299-74:
(ASTM B-29 9-80 is in preparation)
STANDARD SPECIFICATION FOR TITANIUM SPONGE
This specification covers virgin titanium metal melting stock. This
virgin metal is commonly designated as sponge titanium because of its
porous, spongelike texture.
Manufacture
Sponge titanium is usually prepared by reduction of titanium
tetrachloride and gets its spongelike character from the processes
involved in production. This spongy characteristic, however; is not
considered essential and may be expected to vary greatly with
manufacturing methods. The metal is usually supplied in lumps of 1/2
inch (12.7 mm) or less in size. This specification, however, is not
limited to metal prepared by reduction of the tetrachloride or to
material of the size indicated.
Only virgin titanium, free of scrap and intentionally added
contaminants, shall be supplied under this specif ication. It shall be
supplied in uniform, well-mixed blends , each of which shall be clearly
designated.
Sampling
The sampling method used shall be a matter of agreement between the
manufacturer and the purchaser. The following are acceptable industrial
practices:
The sample for determining the conformance of the lot to the chemical
and physical requirements shall be obtained by sampling to produce a O. 50
percent s ample but not less than 30 lb (14 kg) . The blended evaluation
sample shall be compacted into consumable electrodes f or melting . A
portion of the compact shall be sawed off prior to melting and sampled by
drilling for the analysis of magnesium, sodium, chlorine, and hydrogen.
The electrode shall be melted under an inert atmosphere in a vacuum to
form an ingot. The resulting ingot shall be sampled by sawing a
transverse section approximately 1/2 inch (12.7 mm) thick from the center
of the ingot. After machining both sides of this slab, five analyses and
f ive hardness readings are to be made at locations equal distances apart
and diagonally across the machined surfaces. Slices 1/4 inch (6.35 mm)
wide are to be taken from this slab, parallel to the hardness locations,
and sheared to obtain samples weighing approximately 0.1 g. for oxygen
and nitrogen analysis. One half of the slab shall accompany the shipment
and the other half shall be retained by the manufacturer.
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Chemical Requirements
The titanium metal supplied under this specification shall conform to
the chemical composition requirements prescribed in the Table below.
Element
Weight perk_
MW120 ML-120 SL-12 0 GP-1
Nitrogen, max 0.015 0.015 0.015 0.020
Carbon, max 0.020 0.025 0.020 0.025
Sodium, max ~ total) - - 0.19
Magnesium, max 0.05 O.SO
Chlorine, max 0. 12 0 . 20 0 .20 0 .20
Iron, max 0.12 0.15 0.05 0.25
Silicon, max 0.04 0.04 0.04 0.04
Hydrogen, max 0.010 0.03 0.05 0.03
Oxygen, max 0.10 0.10 0.10 0.15
All other impuri ties
(total), max 0.05 0.05 0.05 0.05
Titanium, balance
"nominal) 99.3 99.1 99.3
MD-120 Magnestum-reduced and finished by distillation.
ML-120 Magnesium-reduced and finished by leaching or inert gas sweep.
SL-120 Sodium-reduced and finished by leaching. Sodium or magnesium,
max: 0.50 percent.
GP-1A general purpose grade, either magnesium, or sod~um-reduced and
finished by leaching or inert gas sweep or both.
Methods of Chemical Analysis
The methods of analysis shall be in accordance with ASTM Methods E
120, Chemical Analysis of Titanium and Titanium Alloys, or as agreed upon
by the manufacturer and the purchaser.
Hardness
The Brinell hardness of a lot shall be the average of the hardness
determinations made on the solid samples prepared as described in Section
4 and the hardness value shall not exceed 120 HB. The method of
measurement shall be in accordance with ASTM Method E10 Test for Brinell
Hardness of Metallic Materials using a 10-mm ball, 1500-kgf load, and a
30-s dwell.
Representative terms from entire chapter:
inert gas
