Thank you everyone for your replies. You have confirmed my findings (or lack thereof) regarding change in properties after freezing. I specify H1150 double-aged as: 1150 4hrs, air cool, plus 1150 4hrs, air cool (ref. ASTM A564-02a). As most of you have implied, a proper engineering review of...
I have specified round pins be made of 17-4 H1150 double-aged. I want to freeze these pins prior to insertion into bores. My first question, any metallurgical change that can occur during freezing step that should cause me concern?
Second question. My supplier, in their infinite wisdom...
In ISO 3471 ( Roll-over protective structures or ROPS ) there is a section regarding charpy v-notch testing. This section contains a table of charpy specimen size, test temperature, and energy requirement. The language in this section requires steel members to meet or exceed one of the charpy...
Thank you both. The piping is used in a fire apparatus (mobile), located inside enclosures, protected from the elements. Water temperature is at ambient.
Can someone provide or point me in the direction of where I would find a governing industry weld standard for welding stainless steel pipe, used in a pressurized water application? My first search led me to AWS D1.6, but this appears to be a "structural" welding standard, which is not my...
You may also consider ASTM A747 "Standard Specification for Steel Castings, Stainless, Precipitation Hardening", which lists two grades: CB7Cu-1 (17-4) and CB7Cu-2 (15-5).
I think you're talking about macroetch/macrograph test standards. If so check out:
ASTM E381 "Standard Method-Macroetch Testing...".
MIL-STD-430 "Macrograph Standards for Steel Bars, Billets, Blooms".
MIL-STD-1459 "Macrograph Standards for Steel Bars, Billets, Blooms...".
For my iron castings I've used the brinell hammer method and have always obtained results more true to a laboratory bench test method. Just be mindfull of the fact that the lower range of your hardness will require a good heavy 'hit' with the hammer (the softer castings tend to me more...
Can anyone provide the typical titanium wt% additive, or ratio to boron, in boron treated (carbon/low-alloy) steels? Ex. 51B60,94B30,15B35. Titanium is typically utilized to tie up nitrogen and allow boron to be effective in increasing a given steel's hardenability.
In your application (indoors, surfaces cleaned regularly) , I believe the 201 material should work just fine. Have you reviewed corrosion test data for this alloy? I've tested 201, 201LN, and 304L side-by-side in ASTM B117 chamber and they all look phenonmenal after 1000 hrs (painted, scribed...
You may also consider ASTM A732 "Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures." Grade 13Q (aka IC 8620).
There is fatige S-N curves available from LaSalle's LA-LED grade. This material is for all practical purposes the same as 12L14 - i.e. low carbon, cold drawn, and full of inclusions. I will post summary via upload.
