China 3cr12 Stainless Steel Manufacturers – Reference Material For Coal Testing – Shandong Institute of Metallurgical Science

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Table 1. Certified Values for YSBC 28752-95 (Mass Fraction %)

Number	Elements	TFe	SiO₂	Al₂O₃	CaO	MgO	K₂O
YSBC 28752-95	Certified Values	64.66	4.34	1.80	0.011	0.027	0.082
YSBC 28752-95	Uncertainty	0.15	0.05	0.03	0.003	0.002	0.003
Number	Elements	Na₂O	TiO₂	Mn	S	P
YSBC 28752-95	Certified Values	0.01	0.23	0.007	0.0091	0.020
YSBC 28752-95	Uncertainty	0.01	0.02	0.001	0.0003	0.002

Table 2. Analysis Methods

Composition	Method
TFe	Titanium(III) chloride reduction potassium dichromate titration method
SiO₂	Perchloric acid dehydration gravimetric methodThe silicomolybdic blue spectrophotometric methodICP-AES
Al₂O₃	The chrome azurol S photometric method ICP-AES
CaO	ICP-AESAAS
MgO	ICP-AES AAS
K₂O	ICP-AES AAS
Na₂O	ICP-AES AAS
TiO₂	Diantipyrylmethane spectrophotometric method ICP-AES
Mn	Potassium periodate spectrophotometric method ICP-AESAAS
S	High frequency combustion infrared absorption methodBarium sulfate gravimetric methodCombustion iodometric method
P	Bismuth phosphomolybdenum blue photometryICP-AES

Expiration of certification: The certification of this CRM is valid until January 1, 2025.

Table 3. Methods for homogeneity testing

Composition	Analysis methods	Minimum sample (g)
TFe	Titanium(III) chloride reduction potassium dichromate titration method	0.2
SiO₂	The silicomolybdic blue spectrophotometric method	0.2
Al₂O₃、CaO、MgO、TiO₂、Mn、P	ICP-AES	0.2
K₂O、Na₂O	AAS	0.2
S	The Infrared absorption method	0.2

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