The most commonly chosen shaft for irons, steel has many benefits that suit a set of irons. The carbon steel or stainless steel material is thick and offers consistent torque and flexibility. The advantage of this as concerns irons is the ability to have the same flex and stiffness in your 3 iron as you have in your 9 iron. The reduced price and highly durable features of the metal make it a popular choice for all golfers.
Not as common as steel in the iron market, graphite can still be a great advantage because it is lightweight. This offers a golfer the chance to increase swing speed and perhaps unlock more distance in his/her game. The drawback of graphite is the feel of the shaft. A stiff graphite shaft will not feel like a stiff steel shaft and may mean the feel is not consistent through a graphite-shafted set of irons. The other drawback is obviously price, the process of making graphite shafts is more expensive than steel and this is represented in the price of graphite irons. However, if you are an older, junior or lady golfer who perhaps prefers a light feeling club, then the extra money you spend may benefit your game.