| Postle Newsletter | |
|
Volume 1 Issue 3 |
|
| In This Issue | |
| 1. Welcome 2. Austenitic Alloys 3. Essen Welding Show 4. Humor: Today's Stock Market Report |
|
| 1. Welcome | |
| A very warm and hearty greeting to all of our new subscribers. You can get Issues 1 & 2 by going to the Postle Web Site. Please feel free to comment (good or bad), etc. on this newsletter. Your input is very welcomed and valued. If there is a subject you wish us to cover, by all means, send me an email bmiller@postle.com . It has been longer than I like since our last visit but hopefully we can make it up. | |
| 2. Austenitic Alloys | |
| In the last issue (Issue 2) we discussed Martensitic Alloys. You may recall that these alloys are hardenable by heat treatment or by the natural air quenching form the molten weld puddle. While martensitic alloys serve a variety of wear problems, they are not known for their toughness. Enter Austenitic Alloys. If you have ever tried to saw cut or drill a 300 Stainless Steel you know just how difficult it is. It is tough. And it seems to get tougher the more the
alloy is worked. (Garden variety 304 Stainless Steel is Austenitic). Actually this is a good thing. There are many applications that require a good tough material, such as pulverizing hammers, crusher parts, etc. Martensitic alloys simply can not stand up to the continuing pounding that occur in these environments. But Austenitics do.
It turns out that if we add enough of the right (Austenitizers) to the steel, such as Manganese, Nickel, Chromium, and Carbon, the weld puddle will not transform to Martensite, but remain in the Austenitic condition at room temperature. It takes quite a bit of these Austenitizers, but the results are very rewarding. The deposits are only about 25Rc as-welded, but upon work hardening, they will display hardness levels >40 Rc. This in turn results in fair resistance to abrasion. Even at the elevated hardness levels the deposits are reasonably tough. Most deposits are non-magnetic although after work-hardening the surface may become slightly magnetic. Postalloy products that fall into this category are; *Postalloy 285 SPL & 285 FCO Cored Wires and Postalloy 207 Stick Electrode *WARNING: These alloys have memories. The up-side of these alloys is that they are tough. The down-side is that will become embrittled after repeated excursions above 600ºF. This means be very careful with preheat and interpass temperatures. Every time that the weld metal goes above 600ºF, it remembers and catalogs the time and temperature. Eventually the weld metal will fail by spalling or fracture. This is not a good thing. Postalloy 2865 and the equivalent stick electrode do not become embrittled until a much higher temperature and are not as sensitive to preheats and interpass temperatures. Postalloy 2866 FCO Open Arc Wire and Postalloy 2866 FCO can also be thought of as lesser versions of Stainless Steel and will lend some corrosion resistance in certain environments. Please note that they are not direct substitutes for Stainless Steels however. While these alloys are great for impact in their own right, they are often used as cushion layers for harder more abrasion resistant deposits. Check them out on the website www.postle.com under the heading Austenitics..
|
|
| 3. Postle Industries to show at Essen Welding Show, Germany | |
| Schweissen & Schneiden, the Essen Welding Show takes place only once every four years. This event is truly number one in its industry with the biggest names in the industry taking part and more than 100,000 trade buyers coming to see them. The show will take place on more than 1 million square feet of exhibition space and play host to close to 1,000 exhibitors. With the new hall 3, more exhibitors who were previously on the waiting list will now be allowed to take part.
Postle Industries will be an exhibitor at the show. If you plan to visit the show, please stop in to see us. |
|
| 4. Partings: Today's Stock Market Report |
|
This was sent to me via email from a professional career coach. Thought you might enjoy it.
Today's Stock Market Report
*** Helium was up, feathers were down.
|
|