JIS Japanese steels

I believe JIS ss400 is equivalent to 1018/A36; in JIS - the "ss" stands for structural steel - "SUS" stands for stainless steel.

If I recall correctly - you can run into weldability problems with the ss400 grade due to more maganese or carbon allowed in the spec.

Here is a good comparison table, unfortunately it does not include ss400:

http://www.kennametal.com/images/pdf/techRef/turning/materialGradeComparisonTable.pdf;jsessionid=5R45F52IKFASLLAUBIOCFEVMCQFB0IV0

My thanks to both guests.

In the table I see that our SS (stainless steel) is SUS, in the JIS standards. Thanks, I was not aware of this. Perhaps SS400 is a plain carbon steel like A36 or 1018. Hmm.

Regards

According to the ASTM Handbook of Comparative World Steel Standards:

JIS G 3101:1995 - SS400 does not have an equivalent Steel Number nor UNS Number

Furthermore,

In the hot-rolled condition the strengths are:

Section thickness ≤ 16 mm: Yield min = 245 N/mm² : Tensile min = 400-510 N/mm² : Elong min = 17 %
16 ≤ t < 40 mm: Yield min = 235 N/mm² : Tensile min = 400-510 N/mm² : Elong min = 21 %
>40 mm : Yield min = 215 N/mm² : Tensile min = 400-510 N/mm² : Elong min = 23 %

Lastly (it is a mild steel) there are no specifications (min nor max) on C, Mn, Si, Cr, Ni, Mo, or 'others';

The only chemical composition specification is:

Weight % maximum

P = 0.050
S = 0.050

Thank you very much.

That steel is not really suitable at all to what I need. I am sure glad I asked. For a moment I thought it would be a high quality Stainless Steel.

Thanks again.

in addition to the Worldwide Guide to Equivalent Irons and steels available from ASM,

http://hts.asminternational.org/content/ASM/StoreFiles/ACFAB8B.pdfYou could also look at acquiring a copy of Stahlschlussel, the key to steel. http://www.azom.com/Sale.asp?SaleID=305

And by the way, Your korean suppliers behavior on this technical issue is an important clue for you regarding how they will handle other issues in the future. Good luck.

milo

Thanks Milo,

I too see that as a clue to his general behaviour.

Rolf

What worries me is your statement "...means nothing to them...". If they are competing on the world market, and have no knowledge of any standards other than their own (particularly given that what they offered was not what you wanted) then I would run, not walk, away from that supplier. Or offer to do business with them only AFTER they educate themselves. They should be the ones to know which standards their products meet in the market they wish to contend in. You need to know the product offered meets the standard YOU are working under, not the standard they are comfortable with. But that's MY approach...results may differ

Everything was nicely specified in ASTM and SAE standards. It is a weld structure of three housings including water tight welds. What do I do if it leaks after I get it? I am over here in N. A. I only went there because the draftsman is from there and he says he has connections.

Now, should I take the time and trouble to find in each case the JIS number? Or should I just walk away. Perhaps the latter is the better option.

The prices were low, but I fear the workmanship will be too. And heck, you are right, if these people want to compete on the world market, they better know the "standards" of the world.

Thanks for the tip.

Hey.

"I only went there because the draftsman is from there and he says he has connections."

I'd like to see that in the ISO Manual!

You are on top of this issue, obviously you brought your critical thinking to work today.

Good luck.

milo

would be nice to speak in 3 languages: ASTM, SAE, and JIS

Oh really,

If the manufacturer does not know ASTM or SAE specs then they are a bit player in the game. RUN AWAY, or charge the hell out of them for the "TEACHING".

This shows a real management problem with the company. Oh this is normal for bit players.