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The small one is an "Aristro" Rietz (Nr.89). The bigger has been used for quite a while and its harder to see. Two words i can read on it though; "Küller" and "Impert". Feels good to know where i can get new ones if i break one. I have been looking around at the company for old sliderules but...

Hehe Björneborg it is!

Thanks for all the tips. A correction. The cracks are not longitudal but transverse. The products made of this specific steel "cracks" in the surface. If we forge similar products in other materials there is no cracks, so the problem is specific for this material. More investigation have led...

The Al-content is between 0.020 and 0.040 percent. Nb 0.015-0.025 and C about 0.45. Theres also some Mn, 0.70. I believe the problem has something to do with either tension because the material shrinks differently from the surface and invards during forging or that maybe the Al has some...

Interesting discussion about sliderules. I actually use two sliderules at work for doing calculations for the forging shop. I have a big sliderule that I use at my office and a smaller one that can be used on the shop floor for fast calculations. I use the sliderules for calculating weight...

Hello folks, At the moment I am investigating surface defects of large forgings (up to 50 tonnes). The forgings are used in several types of applications. The common denominator is that they are rotor shafts, forged to cylindrical shape and then machined. What influence has Al and Nb in low...