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Anonymous Poster

Boiler Plate, SA516Gr70

02/28/2009 5:53 PM

We have procured boiler plate, SA516Gr70 in 50mm Thickness from China for the fabrication of 'KILN' Nose Ring Shell at 'HOT' End to a local Cement Factory. The plates were received with the mill test certificate as follows;

As per steel mill certificate: Steel Grade: SA516Gr70

Dimension: 50*2500*10100 per piece

Weight: 9.911 Tons

Chemical Composition: C=0.20%, Si=0.26, Mn=1.17, P=0.009, S=0.004, Cr=0.04, Al=0.036, Mo=0.013, Ti=0.002, Cu=0.0.098, Nb=0.02, Ni=0.22, V=0.002.

Tensile Strength: Re=380Mpa, Rm=540Mpa & A=34%Impact Test: 166J, 164J, 158J

Ultrasonic test: ASTM A435, 910+-10 Degree Centigrade, 1.5min/mm.

Upon receipt of boiler plates we have also got chemical composition lab analysis from two different Labs and the results are;

1) C=0.22%, Mn=1.03%, Si=0.25% and S=0.009%

2) C=0.195%, Mn=1.142%, Si=0.283% and S=0.002%

Can you please confirm with authentic technical references that above material conforms to the required standard of ASME SA516 Grade-70 and/or equivalent to ASTM A516 Grade-70. We are confused and not sure as we do not know the correct chemical composition, tensile strength, yield strength and elongation of SA516Gr70.

Another confusion is carbon content 0.20% which is not meeting as per specified ASTM A516 Grade-70 standard i.e. C=0.27%?

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Power-User

Join Date: Jan 2009
Location: Western Canada
Posts: 298
Good Answers: 52
#1

Re: Boiler Plate, SA516Gr70

02/28/2009 8:14 PM

Taken from the source, ASME Section II Part A, the requirements of SA-516 grade 70 (which is identical to the ASTM specification A-516):

Chemical requirements for 50 mm grade 70 plate:

Carbon MAXIMUM: 0.28%

Manganese: Heat analysis: 0.85-1.20%

Product analysis: 0.79-1.30%

Phosphorus MAXIMUM: 0.035%

Sulfur MAXIMUM: 0.035%

Silicon: Heat analysis: 0.15-0.40%

Product analysis: 0.13-0.45%

Mechanical Properties:

Tensile strength: 70-90 ksi [485-620 MPa]

Yield strength MINIMUM: 38 ksi [260 MPa]

Elongation in 8 in. [200 mm] MINIMUM %: 17

Elongation in 2 in. [50 mm] MINIMUM %: 21

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Anonymous Poster
#2
In reply to #1

Re: Boiler Plate, SA516Gr70

03/01/2009 8:56 AM

Thank you sir for your reply, and I want you to please assist me technically if this plate conforms to the required standard of ASME SA-516 Grade-70 or not? Since these plates were procured for the fabrication of Kiln Shell at Cement Plant, therefore, what is the actual risk involved to install the shell at HOT end of Kiln Nose Ring Area or how can we convince them that the above material is correct and as per SA-516 Grade 70.

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Power-User

Join Date: Jan 2009
Location: Western Canada
Posts: 298
Good Answers: 52
#3
In reply to #2

Re: Boiler Plate, SA516Gr70

03/01/2009 10:40 PM

You should really purchase A20 and SA516 standard from an online store such as:

http://store.ihs.com/specsstore/controller?event=LINK_DOCDETAILS&mid=W097&getCurVer=false&docId=KWMQBCAAAAAAAAAA&mid=W097

http://store.ihs.com/specsstore/controller?event=DOCUMENT_DETAILS&docId=INUPACAAAAAAAAAA

---------------------

Besides the chemical composition - what is the temperature that this steel will be exposed to? Becuase if it is around 750F to 800F or above - you would be better off with a different steel such as SA-515

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Commentator

Join Date: Oct 2006
Location: Northern NY
Posts: 90
Good Answers: 4
#4

Re: Boiler Plate, SA516Gr70

03/02/2009 9:56 AM

We always require that the vendor provide a certificate stating that the material meets the specification. This is in addition to the list of physical and chemical properties of the material. If you are paying for something that has to meet a given industry standard, you can require that the vendor certify that their product meets that standard, and provide proof in the form of certified independent test results. Steel suppliers do this all the time for their customers, as do supplers of other materials such as rubbers, polymers, etc. You might pay a little more for this, but for a critical application like yours, it is worth it. It saves the guesswork and puts the suppler on the hook a little bit.

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Active Contributor

Join Date: Apr 2008
Posts: 15
#5

Re: Boiler Plate, SA516Gr70

03/02/2009 3:57 PM

I do not think SA516Gr70 is a "boiler plate". It is of Flange Quality and used for pressure vessels for lower temperatures. What you need for hgh temperature applications are plates of Firebox quality. You should use SA515Gr70 instead. A 515Gr70 is what is referred to as Boiler Plate.

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Anonymous Poster
#6
In reply to #5

Re: Boiler Plate, SA516Gr70

03/02/2009 9:27 PM

Yes, you are right. In fact SA516 Gr70 refers to lower and moderate temperature. The application in our case is same what this material is specified. The shell has been fabricated for a cement plant at Kiln Nose Ring at outer end which is subsequently insulated with high aluminia refratory bricks in order to prevent from ingress of direct heat fatigue to the shell body. This shell has been joint with AISI-304 stainless steel piece as per given design, and sufficient for a general purpose application. This is not the point. The point is whether this plate conforms to the required standard of SA516 Gr70 or not? The only confusion which I have is carbon content i.e. C=0.20% whereas SA516Gr70 standard refers Carbon content should be C=0.28% (Max) but we do not know what is the minimum carbon content limit according to the SA516Gr70 standard. Is it C=0.18% (Min)? However, can any one resolve this confusion or/and send me a copy ASTM A20/A20M standard as well as ASME SA516Gr70 standard for the cross reference to my e-mail hashamuddinkhan@yahoo.com. Thanks a lot

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Anonymous Poster
#7
In reply to #6

Re: Boiler Plate, SA516Gr70

03/02/2009 10:22 PM

As the specification metions 0.28% max and does not specifiy minimum limit and the sample tested shows carbon content of 0.20% which is within the specified limit.

Therefore the steel should be acceptable.

D.N.Shenoy

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