Other claims have been made for the first invention of stainless steel, based upon published experimental papers that indicated the passive layer corrosion resistance of chromium steel or patented steels with a 9% chromium content intended for engineering purposes. One of these claims is based on an article in a 1913 Swedish hunting and fishing magazine about a steel that was used for, again, gun barrels. The steel seems to resemble a stainless steel so there are indications that the first commercial heat might have been produced in Sweden (see Stainless Steel World, April 2002, page 52-53).