But 17 - 4 stainless cools to a very hard and brittle state .
In other words , the foundries knew what it would do , how much it would shrink , and it cast with high reliability .
17 - 4 stainless cools to a very hard and brittle state .
In other words , the foundries knew what it would do , how much it would shrink , and it cast with high reliability .