Assertion: percent manganese | /r/HasProperty | 16 to 21 percent silicon
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Source sentences:
text: This alloy, containing 65 to 68 percent manganese, 16 to 21 percent silicon, and 1.5 to 2 percent carbon, is produced by the smelting of slag from high-carbon ferromanganese or of manganese ore with coke and a quartz flux.