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MSsteel1
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Join Date: May 2008
Posts: 52
Good Answers: 2

What's the U.S. Equivalent of JIS STKM 13A?

03/03/2009 9:37 AM

I have seen the Spec for the Japanese industrial spec STKM 13A. I know the chemistry and the physicals. In US materials what would you consider this. I have seen this supplied as an ASTM 1020 and also with chemistries to meet HSLA. I have a customer listing it as a ASTM 1008/1010 Second is using HSLA wrong?

C .25max Si .35 max Mn .30 to 1.0 P .040 max S .040 Max

Tensile 38 min kgf/mm sq; Yield 22 min kgf/mm sq Elong 30 Min
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Pathfinder Tags: ASTM 1008/1010 automotive HSLA MT1020 Steel Tube STKM 13A
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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
Posts: 4884
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#1

Re: What's the U.S. Equivalent of JIS STKM 13A?

03/03/2009 7:49 PM

If it were HSLA I would expect to see gr refiner microalloy elements such as Va, Nb, etc. There are none shown in this JIS buttweld,electric weld, or seamless structural automotive tubing spec:

Grade STKM13A

Element

Min.

Max.

Carbon0.25
Manganese0.30.9
Phosphorus0.04
Silicon0.35
Sulfur0.04

Just because 1010/1008 carbons are below the maximum Of .25 does not really mean that they meet the grade intent.

By the way the % elongation accceptable depends on the test piece.I have seen 14% acceptable on a number 5 test piece.

This grade is covered in JIS G3445

milo

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coolsurf
Active Contributor

Join Date: Aug 2011
Posts: 10
#2
In reply to #1

Re: What's the U.S. Equivalent of JIS STKM 13A?

08/04/2011 12:54 AM

I have seen the standard of STKM13A on a JIS G3445.

I was wondering on what is STKM13A-E1?

on the last page of JIS G3445, E(x) is defined as electrical resistance weld. Huh?

So there's E1, E2, E3, so on..... ?

I wonder if someone knows the specs, treatment, coating, etc.. for STKM13A-E1. We are creating a project but the manual specifically states STKM13A-E1.
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