Boiler Plate, SA516Gr70

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

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.

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

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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

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.

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.

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

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