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I'm not sure what the carbon level will be. We were originally told just to order it to ASTM A473 and to heat treat it. ASTM A473 only says that the C is .15 min. I plan to do some ht trials to figure out the process. Thanks for the input!

I have some forgings that need to be heat treated to the following properties: Hardness [HBN] 223-255 Tensile strength [ksi] 121 min Yield strength [ksi] 100 min Percentage elongation 20 min Percentage reduction in area 60 min Charpy impact [Ft lbs] 23 min I have checked the ht ASM handbook...

Are you only working to AMS 5643? Is your furnace in good condition? Usually when I run 17-4 parts I also do a stabilize in between the solution and age operations.

The material is custom 450. All of the mechanical testing came back in spec and similar to the results we've gotten in the past. Microstructure was good too. As far as we're concerned the issue was not with the material because there were no issues with testing or with other parts made from the...

Brinell hardness is more commonly required on forgings where I work over other methods. I've run into problems of hardnesses not matching when sufficient decarb is not ground off. All of the forging specs I've come across have wanted Brinell hardness on forgings.

Depending on the heat treat you will impact your other mechanical properties(tensile, elongation). What material are you working with and what properties are you trying to achieve?

Thanks again for the input. I will look into how they test the quench speed from now on. I haven't really gotten a clear answer from them on what we should do. We have already been having some issues with hardness on some of the quenched parts. My dilemma is do we recondition some of the oil to...

Thanks for all of your responses. The only person I have to discuss the oil with is our Wallover sales rep. I know it's her job to sell us more oil so I was hoping to get feedback from someone without a financial interest. I uploaded what our last sets of test results were. The last time...

Hi, I am new at my job and in charge of the quench oil. We got it tested this spring and it looks like it is at the end of its life. We have 2500 gallons total. The last time all of the oil was replaced was in 2006 and it was reconditioned in 2009. I am looking for advice on what to do. Can this...

I was not involved in the machining process and have no idea how they were machined. I am responsible for the material. It sounds like from what everyone is saying there might have been a problem within the machining process. Thanks for your help.

As far as grain refinement I've seen a part go from a 2 to a 4.

I am from the company that produced the forgings. I personally looked at the mill certs and test records and didn't find anything different than previous runs. I don't know enough about the machining so I am just trying to make sure there wasn't something we did wrong that would cause the excess...

I have some parts that are being machined and there is more vibration than usual. Usually there is less than .015" of movement and with the current batch there is more than .05" of movement. I looked at the heat treat charts and mechanical property results and nothing looks out of the ordinary...

They were forged at 2175F.

I was wondering if anyone knows how high 17-4 material can be heated during solution without growing grain size. I know the recommended temp is 1900F but I'm wondering what will happen if the furnace is hotter(~1970F). Thanks