80NSSC21765645Q Spec Extension.pdf

NASA Marshall Space Flight Center MSFC Inconel 625 Date Issued: 5-26-2021 Revision: 1

Inconel 625 Alloy Gas Atomized Powder Specification

1. The IN625 powder shall be produced using vacuum or inert induction melting and gas atomization in argon. The furnace charge for atomization will consist of master alloys, virgin melt stock, solid revert of controlled purity, or any combination thereof.

2. Unless explicitly specified by the purchase request, the requested quantity of powder shall be supplied as a single lot. The single lot may be supplied as a blend of multiple heat lots. Blending of multiple heat lots into a single lot is allowed only if every lot blended is verified independently to meet all aspects of this specification. Heat lot numbers and their independent certification will be provided for each blended lot. Blending of heat lots will not be used to control chemistry or particle size distribution. Blending of heat lots will not occur other than at the original powder producer.

3. The IN625 powder shall have composition as shown in Table 1.

4. Chemical composition shall be verified for carbon, sulfur, nitrogen, and oxygen per ASTM E1019.

Other elements of Table 1 shall be verified by wet chemical methods per ASTM E354 or inductively coupled plasma spectroscopy per ASTM E2594. Other methods may be used if agreed upon prior to contract award. Chemical check analysis limits of SAE AMS 2269 are applicable.

NASA Marshall Space Flight Center MSFC Inconel 625 Date Issued: 5-26-2021 Revision: 1

5. The IN625 powder particle size distribution (PSD) shall target the ranges listed in Table 3. The supplier shall furnish a certification for each powder lot per ASTM B214 (Sieve Analysis) and ASTM B822 (Light Scattering) including analysis for the mesh size, name of analyzing lab, the date analyzed, and analysis method. Other methods may be used if agreed upon prior to contract award.

6. IN625 powder shall be primarily spherical in shape, free of significant satellite particles, and have smooth surfaces. Powder vendor may meet these requirements by supplying images of a mono-layer sample of the powder lot of approximately 0.5 cm2 area at sufficient magnification/resolution to observe particle shape and confirm the absence of significant satellite particles. Powder sampling must meet minimum acceptable methods as defined in

ASTM B215.

7. Post-production additions to the powder lot for control of PSD or chemistry are not allowed.

8. The IN625 powder must be handled and processed under inert atmosphere as vendor’s process allows. All exposures to atmosphere during handling and processing will be described prior to processing, and allowed with pre-approval by NASA. IN625 powder shall be packaged in air-tight, inert gas filled containers or drums no larger than 20 kg each.

9. The IN625 powder shall be delivered with Certificates of Conformance (CoC) specifying lot number, and the date and facility location of powder production, and verification of compliance to all requirements listed in this specification. If the provided lot of powder is a blend of heat lots, the CoC must contain compliance information for each blended lot.

Deliverables

1. Vendor shall supply a minimum 400 Kgs of Inconel 625 Class B size according to above requirements and per Table 3 sizes and all process certifications. Powder shall be delivered to MSFC within 12 weeks of award.

Inconel 625 Alloy Gas Atomized Powder Specification