Каталог стандартов

+7 (495) 223-46-76 +7 (812) 309-78-59
inform@normdocs.ru

ASTM B393-09e1

Заменен
Standard Specification for Niobium and Niobium Alloy Strip, Sheet, and Plate (Withdrawn 2018) — 6 стр.
Причина отмены This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate: R04200–Type 1, R04210–Type 2, R04251–Type 3, R04261–Type 4, and R04220–Type 5.

Formerly under the jurisdiction of Committee B10 on Reactive and Refractory Metals and Alloys, this specification was withdrawn in January 2018 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

Значение и использование

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.

Реферат

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.

Область применения

1.1 This specification covers five grades of wrought niobium and niobium alloy strip, sheet, and plate as follows:

1.1.1 R04200-Type 1Reactor grade unalloyed niobium,

1.1.2 R04210-Type 2Commercial grade unalloyed niobium,

1.1.3 R04251-Type 3Reactor grade niobium alloy containing 1 % zirconium, and

1.1.4 R04261-Type 4Commercial grade niobium alloy containing 1 % zirconium.

1.1.5 R04220-Type 5RRR 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 and health practices and determine the applicability of regulatory limitations prior to use.

ICS
77.150.99 Other products of non-ferrous metals / Продукция из цветных металлов прочая
Сборник ASTM
02.04 Nonferrous Metals – Nickel, Titanium, Lead, Tin, Zinc, Zirconium, Precious, Reactive, Refractory Metals and Alloys: Materials for Thermostats, Electrical Heating and Resistance Contact, and Connectors / Цветные металлы - Никель, Кобальт, Свинец, Олово, Цинк, Кадмий, Драгоценные металлы, химически активные металлы, Тугоплавкие металлы и сплавы, Материалы для Термостатов, Электронагревательных приборов, Контактов, Соединительные устройств
Тематика
Other Nonferrous Metals