Production plus imports minus exports, sometimes also adjusted for changes in inventories. The intention here is not to distinguish different uses for a good within the country, but only to infer the total that is used there for any purpose.
Total shipments minus exports plus imports of steel.
The mathematical sum of production plus imports minus exports. The difference between 'apparent' consumption and 'real' consumption is that the latter definition also recognises changes in stock levels. The phrase 'apparent consumption' is often used interchangeably with 'apparent domestic consumption' (abbreviated ADC)