GB/T 41706-2022: Metallic powders - Test method for determination of non-metallic inclusions in metal powders for powder forging

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Scope

This document specifies a metallographic method for determining the content of non-
metallic inclusions in metallic powders by using powder-forged samples. This
measurement method requires that the powder-forged sample has as little lateral flow
as possible (< 1%) during forging, and requires that the central area of the powder-forged
sample has no visible pores under the magnification of 100×.
This document applies to the detection of non-metallic inclusion content in powder-
forged parts. In parts with a large amount of lateral flow of material, the separation
distance between nearest neighbors needs to be adjusted, or the size of inclusions that
need to be adjusted can be determined through negotiation between relevant parties.
This document does not apply to the determination of the level of non-metallic
inclusions in internal porous forgings. Residual porosity is difficult to distinguish from
inclusions during the magnification in the test. Too much residual porosity makes
inclusion distribution determination difficult.
This document can be applied to the detection of materials containing manganese
sulfide (pre-mixed or pre-alloyed). In order to meet the test of this type of material, the
nearest neighbor separation distance needs to be adjusted from 30 μm to 15 μm.

Basic Data

Standard ID	GB/T 41706-2022 (GB/T41706-2022)
Description (Translated English)	Metallic powders - Test method for determination of non-metallic inclusions in metal powders for powder forging
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H16
Word Count Estimation	10,156
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration