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ASTM B393-18
Standard Specification for Niobium and Niobium Alloy Strip, Sheet, and Plate
Přeložit název
NORMA vydána dne 1.4.2018
Informace o normě:
Označení normy: ASTM B393-18
Datum vydání normy: 1.4.2018
Kód zboží: NS-848402
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Anotace textu normy ASTM B393-18 :
This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate. These are reactor grade unalloyed niobium (R04200-Type 1), commercial grade unalloyed niobium (R04210-Type 2), reactor grade niobium alloy containing 1% zirconium (R04251-Type 3), commercial grade niobium alloy containing 1% zirconium (R04261-Type 4), and RRR grade pure niobium (R0xxxx-Type 5). The RRR grade pure niobium is used in superconducting applications that require ultra high purity, making it conducive to very large grains that can adversely affect formability. It is therefore not recommended for other applications. The materials shall be made from ingots produced by vacuum or plasma arc welding, vacuum electron-beam melting, or a combination of these three methods. The various niobium mill products covered by this specification are formed with the conventional extrusion, forging, swaging, rolling, and drawing equipment normally available in metal working plants. Samples for chemical and tension testing shall be taken from the finished material after the metallurgical processing to determine conformity to this specification. The samples may be taken prior to final inspection and minor surface conditioning by abrasion and pickling shall be representative of the finished product.
Keywords:
niobium, niobium alloy plate, niobium alloy sheet, niobium alloy strip,
Doplňující informace
| Significance and Use | ||||||||
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13.1 For the purposes of determining compliance with the specified limits for requirements of the properties listed in this specification, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29. |
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| 1. Scope | ||||||||
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1.1 This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate as follows: 1.1.1 R04200-Type 1—Reactor grade unalloyed niobium, 1.1.2 R04210-Type 2—Commercial grade unalloyed niobium, 1.1.3 R04251-Type 3—Reactor grade niobium alloy containing 1 % zirconium, 1.1.4 R04261-Type 4—Commercial grade niobium alloy containing 1 % zirconium, and. 1.1.5 R04220-Type 5—RRR grade pure niobium. Note 1: This grade of niobium is used in superconducting
applications that require the ultra high purity. Because of the
high purity the product is conducive to very large grains that can
adversely affect formability. It is not recommended for other
applications.
1.2 Except for dimensional tolerances in Table 1, the values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 The following precautionary caveat pertains only
to the test methods portion of this specification. This
standard does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety, health, and
environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||
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