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ASTM A 516 grade 70 properties

ASTM A 516 grade 70 properties

(OP)
Hi!!!

I´m searching the following data for ASTM A 516 grade 70:
-Thermal Conductivity
-Metal density
-Specific Heat

I´ve searched in sect 2 of ASME but I just got the termal conductivity (I think is material group b) and I found that this value is between 26 to 20 btu/hr*ft2*F depending of the temperature. I also searched in a page called matweb and I found something but I do not know if this website is trustworthy because the value for termal conductivity appears as 361 btu/hr*ft2*F. How I see a big difference of value between both sources, I trust more in what in ASME sect 2 appears. So the other data shown in the website matweb...I do know if these values are correct.

Can you help me where I can obtain a trustworthy data for SA-516-70?

Thank you very much

RE: ASTM A 516 grade 70 properties

What alloy is it? Give me UNS number and I can look it up in the ASM high Temp data.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: ASTM A 516 grade 70 properties

You have a units problem, not a "trust" problem. Heat transfer analysis in Imperial units is BRUTAL!

From Section II, Part D, Table TCD, SA-516-70 would be classified as Group 1, because Note 1 says:

Quote (ASME Section II, Part D, Table TCD, Note 1)

Material Group A includes those materials listed as “Carbon steel” in the Nominal Composition column in Tables 1A, 2A, 3, 5A, U, or Y‐1.
and SA-516-70 indeed has the Nominal Composition of "Carbon Steel".

Therefore, your value of thermal conductivity ranges from 60 W/(m*K) (34.7 BTU/(hr*ft*°F)) at 38°C (100°F) to 26.8 W/(m*K) (15.5 BTU/(hr*ft*°F)) at 816°C (1500°F).

MATWEB reports an overall range of thermal conductivities for "Low Carbon Steels" of 25.3-93.0 W/(m*K) or 176-645 (BTU*in)/(hr*ft²*°F). Notice the units shift?

The ASME Section II, Part D, Table TCD values are consistent.

As far as specific heat capacity, that data also exists in Table TCD, but it is hidden in the Thermal Diffusivity (TD) column. See General Note (a).

As far as density goes, that is provided in Table PRD, also in Section II, Part D. Lucky for all of us, density is not a strong function of temperature, in metals.

RE: ASTM A 516 grade 70 properties

Yes, the little 'divide by 12' is real pain.
Thermal conductivity varies more based on composition than do any other physical properties.
The values of ( and temperature dependence) density, modulus, heat capacity, and even thermal expansion are only very slightly impacted until you start adding 2% Cr or 1% Mo to a steel.
One interesting thing about thermal conductivity is that it very similar for all steels (even highly alloyed grades) at 1500F (800C). The significant variation is only at room temp.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: ASTM A 516 grade 70 properties

The TC values published by ASME B&PV Code are data you can hang your hat on, period. Specific heat will vary with service temperature we will density. You can use typical values for carbon steel.

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