Wholesale Analytical Reference Standards Factory – Reference Material For Steel Testing – Shandong Institute of Metallurgical Science

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Table 1. Certified Values and Uncertainty (℃)

Sample Number	Testing atmosphere	Certified value and Uncertainty	Characteristic Melting Temperature (℃)
Sample Number	Testing atmosphere	Certified value and Uncertainty	Deformation Temperature (DT)	Softening Temperature (ST)	Hemispheric Temperature (HT)	Flowing Temperature (FT)
SDRM 040005 579#	Reducing	Certified value	1171	1184	1192	1217
	Reducing	Uncertainty	21	30	30	30
	Oxidizing	Certified value	1191	1202	1215	1250
	Oxidizing	Uncertainty	26	30	33	15
SDRM 040006 580#	Reducing	Certified value	1350	1366	1373	1389
	Reducing	Uncertainty	15	15	17	18
	Oxidizing	Certified value	1368	1380	1387	1419
	Oxidizing	Uncertainty	21	23	24	26
SDRM 040007 581#	Reducing	Certified value	1245	1294	1314	1374
	Reducing	Uncertainty	18	15	15	29
	Oxidizing	Certified value	1308	1344	1369	1409
	Oxidizing	Uncertainty	23	20	17	15

The reducing atmosphere is obtained by introducing into the furnace the mixture gases of (50±5)% CO₂ and (50±5)% H₂ (in the most tests) or by sealing in the furnace the proper ratio of graphite and anthracite (in a few tests); the oxidizing atmosphere is obtained with air circulates freely through the furnace.

The certification analyses were performed according to the Chinese National Standard GB/T219-2008 by 8 qualified laboratories.

The homogeneity tests were performed according to GB/T219-2008, the results show that the homogeneity was good.

Expiration of certification: The certification of this CRM is valid until November 1, 2031.

The certified reference material is packed in glass bottles with plastic covers. The net weight is 25g each. It is suggested to keep dryness when stored. The certified reference material should be reduced in size to <0.1mm and ignited at 815℃ for 1 hour before use. This certified reference material is not applicable in the identification of the deviation of furnace temperature, the users should be sure the furnace temperature has been controlled correctly before the testing.

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