Active Standard ASTM B391 | Developed by Subcommittee: B10.03
Book of Standards Volume: 02.04
Historical (view previous versions of standard)
This specification covers unalloyed and alloyed niobium ingots prepared by vacuum- or plasma-arc melting or electron-beam melting to produce consolidated metal for processing to various mill shapes. The materials covered by this specification are R04200-Type 1 which is a reactor grade unalloyed niobium, R04210-Type 2 which is a commercial grade unalloyed niobium, R04251-Type 3 which is a reactor grade niobium alloy, and R04261-Type 4 which is a commercial grade niobium alloy. The ingot metal for all four types shall be vacuum or plasma arc melted, vacuum electron-beam melted, or any combination of these three methods. The materials shall conform to the required chemical composition for carbon, nitrogen, oxygen, hydrogen, zirconium, tantalum, iron, silicon, tungsten, nickel, molybdenum, hafnium, titanium, boron, aluminum, beryllium, chromium, and cobalt. The ingots shall also conform to the required maximum Brinell hardness.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Significance and Use
For the purpose of determining compliance with the specified limits for requirements of the properties listed in the following tables, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.
1.1 This specification covers unalloyed and alloyed niobium ingots prepared by vacuum- or plasma-arc melting or electron-beam melting to produce consolidated metal for processing to various mill shapes.
1.2 The materials covered by this specification are:
1.2.1 R04200-Type 1—Reactor grade unalloyed niobium,
1.2.2 R04210-Type 2—Commercial grade unalloyed niobium,
1.2.3 R04251-Type 3—Reactor grade niobium alloy containing 1 % zirconium, and
1.2.4 R04261-Type 4—Commercial grade niobium alloy containing 1 % zirconium.
1.3 Unless a single unit is used, 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.
1.4 The following precautionary caveat pertains only to the test method portions 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E2626 Guide for Spectrometric Analysis of Reactive and Refractory Metals
ICS Number Code 77.150.99 (Other products of non-ferrous metals)