Comparing Materials: A516 Gr.70 Impact Tested (S5) vs. A537 CL 1

I am going to split my response into several posts because of the pictures.

Here is the specification for A537 directly from the standard

Here are the specs for A516 (again, directly from the standard)

S5 is the designation from ASTM A20:

ASME BPVC - Section VIII Div 1:

A537 Cl 1 (less than 2-1/2") has an allowable strength at those temperatures of 20,000 psi; BUT, this depends on the applicable, if any impact testing, which depends on the thickness of the material.

A516 Gr. 70 (with impact testing for those temperatures) has an allowable strength of 20,000 psi.

Lastly, both materials have a P-No of 1 and Group-No 2; which means they are similar materials for welding purposes.

If you have anymore questions, don't hesitate to post.

.......... but if you weren't looking for such specifics ..............

A516 is generally cheaper, but it is easier to get higher impact energies for better low temperature performance out of A537

Dear Guest

many thank to your professional reply, But, can you advise that, for refrigerated LPG, what material is better than? A516 Gr.70 impact tested (S5) or A537 CL 1? I am not Mechanical Engineer, so, some matter, which concerned to mechanical field, I need the advise from people who have more knowledge than me.

It depends on what you are fabricated and to what code/standard.

If you are building to low pressures/sizes/thicknesses for API 620 or Sec VIII Div 1 you may go with A516-70 impact tested - IF you meet the impact energy requirements (by specifying minimum requirements in the purchase order).

If you are going higher pressure (thicker material) VIII-1 or are building to Sec VIII Div 2 you should go with A537-1 (and meet any applicable impact testing that is required).

I won't comment on any other standards/codes, particularly transportation codes (road/rail tankers)

Dear Guest

everything seem clear, Thank you for your advice

D. N. Son

Dear sir,

This is Bharath, our design people mentioned Boiler quality steel for especially for high temperature resistant.

Please suggest among A516 & A537 for high temperature.

Thanking you,

Bharath,

India.