chromium and nickel

nickel and molybdenum

aluminium and zinc

tungsten and sulfur

steel

Al₂0₃

Si02

MgO

50 : 20 : 20 : 10

40 : 30 : 20 : 10

50 : 20 : 10 : 20

30 : 20 : 30 : 20

acidic

basic

neutral

brittle

70% copper and 30% zinc

90% copper and 10% tin

85-92% copper and rest tin with little lead and nickel

70-75% copper and rest tin