Dear all,
Sorry it took me a while to respond, I was gathering some infos.
Supplier A's certificate only says that the material is "hot rolled". The hardness they say is 308HB.
I agree with Martino's statment "a".Since both suppliers have similar prices, purchase department chooses which one to...
Thank you for your answers!
The hardness we get from Supplier A is around 220-230HV and Supplier B around 200-210HV.
Great explanation on the carbides, that was what I was looking for.
I find it hard to believe Supplier A would sell as the material in the "as rolled" condition (cheaper) but...
We buy our AISI 4140 material from two different suppliers.
For one particular application we are trying to make a component induction case hardened (since we have the induction machine in house) instead of fully quenched and tempered (which is how we do it today, with a heat treatment...
Hello guys,
Has anyone had problems on nitriding cast iron, regarding hardness of the layer?
We currently gas nitride some parts made of GGG-50 to a hardness of 650HV. In some cases the entire lot of pieces comes with low hardness (~350-450HV).
Our supplier says (we don't nitride in house) that...
Hi guys,
I'm aware that SAE 8620 is better suited. We have a lot of WCB that was used for other project and that is now descontinued, so we want to utilize the remaining steel in other parts. Since the other properties of the WCB go with our project, the carburizing part is the only one we are...
Hello,
Has someone attempted do carburize astm A-216 WCB (GS-C25)?
Would it be possible to reach around 58 HRC surface hardness with this steel?
I'm doubtful due to it's carbon content being 0,3%.
Thanks in advance!
Taylor,
That's because it is not tempered, only hardened. This was already defined when I joined the company and seems that never caused problems (because the part doesn't suffer as much mechanical stresses as it suffers with abrasion). The problem is the deformation that happens randomly...
Hello,
Does anyone have a good material on induction hardening parameters to recomend?
Preferably something more practical. What we need exactly is a relation between material, diameter, power, frequency and hardness. Could be a table, chart or even a formula so we can use to improve our...
Tmoose
The maximum warping allowed depends on the version of the rotor, but usually is around 0,5mm for the longest ones. When they warp it can go up to 1mm.
We do the induction hardening in house, and the coil is the "single turn" type...
EdStainless
We haven't done that for this material, but we have for D6 (due to avoiding microcracks) and the warping still occurs. I believe that the machining processes add too much stress to the material.
Maui
The stress relieving operation after machining will be tested, but we don't want...
Hello,
We are induction hardening rotors made of SAE 4140 and we are having problems with warping. Most of the rotors are long and have small diameter(for example 70mm diameter and 1000mm long), but it also happens in the ones with smaller D/L ratio.
The material is recieved as bar stock and...
