DIN 10088-1 4

[metalguesser]

Hi All!

We are looking for an equivalent AISI grade for the subject material. Would anybody know if there is an equivalent AISI/UNS number. It is also identified as X4CrNiMo 16-5-1, which simply means 16% Cr, 5% Ni & 1% Mo. Is there any mill in the US making this grade?

I guess the next question that follows would be is there any material data available providing forging temperature, Heat treatment and any machinability issues. We plan to anneal after forging to facilitate machining (not sure if its the right thing to do). Required finish hardness is 32 to 35 HRC and YS 108 ksi (min).

Appreciate any or all help.

Thanking y'all in advance,

Regards

 

[arunmrao]

This is quite close to a grade I cast for mandrels,with the exception that there is 0.2% Va too. It is a air hardening variety of steel,extremely sensitive to cracking,

Machining is not a concern,but remember to stress relieve after machining if you plan to oil quench and harden followed by tempering. In my opinion you can achieve your specs by air hardening,but ensure uniform cooling..

Save water Drink Beer

 

[TVP]

DIN EN 10088-1 is a list of various stainless steel grades. Grade X4CrNiMo16-5-1 (1.4418) is a low-carbon martensitic stainless steel that does not appear to have an ASTM equivalent. Actually, it is only ~ 80% martensitic when quenched and tempered, with ~ 5-10% retained austenite and ~ 5-10% ferrite. Anyway, I checked various ASTM standards as well as ASM HANDBOOK Volume 1 and Carpenter's stainless steel guide, and no ASTM grades were even close. The following link has a nice description of this grade and illustrates why it is not a common grade:

http://www.valbrunanordic.se/dokument/produktblad/EN 1.4418 0402 ENG.pdf

 

[metalguesser]

Thanks TVP for the link and info' on X4CrNiM0 16-5-1.
I checked on Carpenters data sheet and found a somewhat similar steel (a casting variety, I'm told) conforming to UNS S45000. I was wondering if this grade could be offered
and yet achieve mechanicals (YS 108 ksi, Hardness 32-35 HRC,
Charpy 31 Ft-lb @ 4deg F in 3 samples). We have no experience with UNS S45000. Can any one share your experience with this grade??

The other grade that has been touted is the 15-5 PH grade.
I guess that may work and again we have little or no exposure to this grade of steel. Appreciate any help in this regard

We are trying to find alternatives for X4CrNiMo 16-5-1 in the US market to offer to our customer. Any pointers would be greatly appreciated.

Thanks again,

Regards

 

[CoryPad]

If you want an equivalent, there are none. If you are interested in alternatives, then there are few choices. UNS S45000 is very close, and Carpenter has a version called Custom 450 that you should consider. Alloys 15-5 and 17-4 also are used for similar applications. In addition to Carpenter, AK Steel and Allegheny Technologies produces these types of alloys.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[TVP]

The datasheet that you saw from Carpenter for Custom 450 is not for a casting, it is for a wrought product (bar, rod, etc.). Carpenter only supplies wrought mill products, not foundry ingots, etc. As CoryPad mentioned there are a number of alternatives that can be considered, although they are all precipitation hardening grades instead of the complex martensitic-ferritic-austenitic grade X4CrNiMo16-5-1. Will your forging eventually be welded to something? This appears to be the main usage for 16-5-1, otherwise any number of high strength stainless steels with adequate corrosion resistance may be possible. What's the end use environment?

 

[metalguesser]

CoryPad and TVP - Thanks for the useful information.
Yes we are considering alternatives for X4CrNiMo 16-5-1 on account of the long leadtimes for procurement from Europe.
Local mills are prepared to cast them if we have the right quantities, which, unfortunately, we do not have. We shall try our luck with AK Steel, Allegheny technologies.

Answering TVP's questions; yes there is welding involved at a later stage, though our role ends with the supply of forged block. The end use environment is corrosive oil well/refinery. We are trying to get them to accept UNS S45000 or 15-5PH grade steel. While we wait on the customer to get bcak with their decision, we are working on the processing aspects. Any suggestions on this is always welcome.

Regards



Regards

 

[metalguesser]

Hi Guys,

What would be a good place to get some information on the machinability of X4CrNiMo 16-5-1 grade steel?? I'm not finding relevant info' on Google. Appreciate any help or pointers in this regard.

Regards

 

[CoryPad]

I would ask the suppliers. Try Valbruna Nordic from TVP's message above, or maybe Häuselmann:

http://www.haeuselmann.ch

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[matrix23]

If corrosion behaviour is important on your application 17-4 would be the better choice instead of 15-5PH. For this kind of steels only a few grades are available: 16-5-1; 17-4; 15-5PH and 13-4 listed in decreasing corrosion behaviour