A516 GR 60 vs A516 GR 70

[Akoll]

Dear All ,
How can I check if the plate A516 grade 60 or 70 from these information below :
1. C = 0.16 , Mn = 1.3
2. Y.S = 348 Mpa
3. T.S 535 Mpa
4. E.L 40.5 %

End user said its Garde 60 But MTC mentioned its Garde 70 , any additional test required ?

 

[dtimberlake]

Please thoughtfully review your original question for completeness.
The provided information is far too skimpy.

For a brochure engineered answer you need a copy of ASTM A516.

What is the end user's stated reason for believing they have grade 60?

Who says the UTS is 535 mpa?
What do they provide as their evidence?

Grade U.S. [SI] Tensile Strength,ksi [MPa]
55 [380] 55–75 [380–515]
60 [415] 60–80 [415–550]
65 [450] 65–85 [450–585]
70 [485] 70–90 [485–620]

Is the plate over 8 mm thick?

The chemistry is nominally incorrect. Nominally too Low carbon but the high Mn probably offsets that.

The YS and elongation are both quite a bit higher than required.

 

[Akoll]

Please thoughtfully review your original question for completeness.
The provided information is far too skimpy.

For a brochure engineered answer you need a copy of ASTM A516.

What is the end user's stated reason for believing they have grade 60?

Who says the UTS is 535 mpa?
What do they provide as their evidence?

Grade U.S. [SI] Tensile Strength,ksi [MPa]
55 [380] 55–75 [380–515]
60 [415] 60–80 [415–550]
65 [450] 65–85 [450–585]
70 [485] 70–90 [485–620]

Is the plate over 8 mm thick?

The chemistry is nominally incorrect. Nominally too Low carbon but the high Mn probably offsets that.

The YS and elongation are both quite a bit higher than required.

Plate thickness is 55 mm its over 2 inch , all the results in above got it from MTC
End user test the plate and found the carbon content is too low , as per ASTM the carbon content is (Over 2 in. to 4 in. [50 to 100 mm], incl 0.22 0.25 0.28 0.30 ) Gr 55 ,GR60 Gr 65 & Gr70 .
As you mentioned High Mn offsets that

is there any min limit for carbon content for this grade ?
Regarding T.S within the range in ASTM 516

 

[IdanPV]

According to ASME II-A, SA-516/SA-516M,
The values you mentioned are suitable for both Gr.60 and Gr.70.
Note that the values for Carbon are the maximum allowed values and that for each reduction of 0.01% below the specified max. for Carbon, an increase of 0.06% above the specified max. for Manganese is permitted (up to 1.5%/1.6% heat analysis/product analysis)

Where did the minimum Carbon content criteria came from?

 

[Akoll]

According to ASME II-A, SA-516/SA-516M,
The values you mentioned are suitable for both Gr.60 and Gr.70.
Note that the values for Carbon are the maximum allowed values and that for each reduction of 0.01% below the specified max. for Carbon, an increase of 0.06% above the specified max. for Manganese is permitted (up to 1.5%/1.6% heat analysis/product analysis)

Where did the minimum Carbon content criteria came from?

 

[Akoll]

Hi Dear ,
They did a test by using Spectrometer & got the carbon content very low , also H.B equal to 137

my question if we applied tensile test by using Test Specimen the result will be the same ?

 

[weldstan]

The C and Mn content are typical for SA516 60 for that thickness of plate and thetensile properties are whithin the range of 60. I fail to understand your concerns other than you are somewhat inexperienced. Rolling parameters highly influence tensile properies - not just chemistry.

 

[IdanPV]

They got he carbon content very low, 0.16% you wrote.

But the Standard isn't define minimum value for Carbon, only max.

If the Gr.70 is stated on the MTR, what is the problem?

 

[pvros]

As already asked, what is the point on arguing on gr.60 or 70? Without knowing the real problem, we are just blinding answering you.

If certificate says gr.70, formally it is a gr.70.

Then, there is a wide overlapping range between gr.60 and 70. They are almost the "same" material.
Often happen that plates are dual certified gr.60 and 70. Maybe there is separate certificate that you miss?
If plates are used on an existing equipment, what material is stated on the drawing? Which allowable stress has been used in calculation?

HB of 137 is aligned with the mechanical strength of a gr.60 steel as per SA-350.

 

[Akoll]

They got he carbon content very low, 0.16% you wrote.

But the Standard isn't define minimum value for Carbon, only max.

If the Gr.70 is stated on the MTR, what is the problem?

In MTR they requested only Grade
when they did the product analysis they found the carbon content is very low but at the same time they tested the hardness , during hardness test it’s passed , the hardness value with in the range of GR70
They have doubt because the carbon content

 

[Dhurjati Sen]

It seems that you have already purchased the plates. Send samples to a reputed laboratory for identification. No use fussing over MTC at the moment.