The metallurgists in our company are discussing the two standards as to which one is more suitable. One of our engineers checked a Brinell test block with HRC and the ISO conversion is closer than the ASTM document. I'm interested in the Eng-Tips community's thoughts on these standards.
Hello,
I'm normally in the Metallurgy forum but I am dealing with an issue with my HOA. We just formed the association to deal with the deteriorating roads in our subdivision. The roads are 20 years old and have never been resurfaced, just numerous patches throughout. We are getting quotes for a...
I recently had one of my hardness testers repaired and recalibrated. The service person told me that it is now recommended to use an individual HRA or HRC indenter instead of the combination HRC indenter being used for HRC, HRA, and HRD scales.
I searched ASTM E18-17e1 for such recommendation...
Hello fellow heat treaters,
In our heat treat shop we use thermocouples and oxygen probes for carburizing furnace process control. Every three months we replace the thermocouples but we don't normally replace the probes unless they are not working or cannot be cleaned. Cleaning can be difficult...
I recently read thread725-241866: CWI Stamp in order to answer this question but I need an answer based on the newest version of the Code.
It was my understanding from previous versions of D1.1 that a CWI does not have to stamp certifications signifying that a person is qualified to weld, at...
Hello,
I work at a facility that manufactures steel gears. The gear teeth are finished using an oil-based lapping slurry. Eventually the slurry is spent and the lapping machine is recharged with fresh product.
Historically for us the spent product is solidified then landfilled. I am trying to...
Hello,
We have pusher carburizing furnaces at our shop with four or five zones. I'm currently having an issue with the first (heat-up) zone where we had to raise the first zone temp from its normal 1725F.
We checked the burners and radiant tubes, switched thermocouples, etc., but I would like...
I saw this designation on a resume a few weeks ago. I think it has something to do with welding or visual inspection of welds, but my google searches were not successful. Any ideas?
DIN 6325 is a standard for dowel pins. I am trying to find a conversion in order to specify a SAE steel. From what I have read to date, through-hardened alloy steel should be used. I noted AISI 8740 during a Google search, but I would appreciate if anyone has more detail.
I've got a batch hardening furnace that is giving me a hard time lately. Actually, a soft time becuase I'm getting some decarb no matter how much natural gas I put in to scavenge oxygen [sad].
Usually in this case we will take the furnace cold and go in to look for bad radiant tubes, etc. Of...
I have a shaft requiring induction hardening along most of its length, which is accomplished by a single shot coil. There are two versions of the shaft, one made from 4340H and the other from 4145 steel. The shafts are quench-and-tempered to 45HRC prior to IH.
With the 4340 I get the desired IH...
At my facility we have a single-end flash buttwelder used for joining cold drawn tube stock to forged ends. The 6.375" diameter tube has a wall thickness of .690" and the forged end is partially bored to produce a corresponding mating wall.
My question deals with the formulas used to calculate...
We've finally reached the modern age on our plant painting line, replacing waterfalls with dry filters to reduce haz disposal costs. They've been in place a few weeks now with no issues until now.
Last night after what was thought to be a routine filter change, some discarded filters caught...
I'm writing a procedure on how to handle tray wrecks in a pusher carburizing furnace. History has told me that wrecks will never be completely eliminated, but it is how you handle them that minimizes loss of product in the furnace.
The furnace operates at 1700F with endo+NG atmosphere. Like I...
I'm having an issue with induction hardening a 2.5" dia/ 8" long shaft made from 4340H steel. What is unique about this job is that there is an axial drilled hole running through the length, there is a rolled spline at mid-length with a hole drilled from the surface to the axial hole.
My issue...
I still use an Alnor for checking furnace dewpoints. No big deal there, they still work for what I need in my heat treat.
My concern is on the regs side of the business. I have been requested to attend radiation safety training on the proper use of the Alnor, including personal and exposure...
My company paints large axle housings with a VOC-compliant air-drying coating to a dry film thickness of 2-3 mils. Areas not requiring paint are typically masked prior to entering the paint booth.
I now have an issue with one of our customers, who has requested that no paint be evident on a...
Other than destructive testing, does anyone know of any reliable, portable NDT methods of verifying weld penetration? I'm uncertain about UT or RT. The joint is a FCAW fillet weld of 90-60 cast steel to 1026 wrought using E70T-1 wire. Thanks!
I seem to recall a few threads on this topic but I'm not sure. I recently was audited by our safety person who was shocked when I told him I had picric acid in the lab. Reportedly use of the compound was banned in our company labs.
Anyway, I don't have the solid form but rather a 1% aqueous...
I recently evaluated some prematurely worn and some new set rings used to set up dial bore gages. Print calls out Timken Graph-Mo tool steel hardened, deep frozen to 63-64 HRC. My analysis found the gages to be case hardened 8620 steel; the new ones were 61-62 HRC and the worn ones 53-58 HRC...
