ASTM A789 vs A790 SA789 vs SA790 Difference between A789 and A790

ASTM A789 is for small size tubes and tubing, mainly used for Pressure vessel such as Heat Exchanger. ASTM A790 is big size stainless steel pipe, mainly used for fluid transportation. Both include Seamless and Welded.

What is ASTM A789 and A790?

ASTM A789 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

ASTM A790 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe

Standard Item	ASTM A789	ASTM A790	EN 10216-5
Grade	S31803 S32205 S32750	S31803 S32205 S32750	1.4301 1.4307 1.4948 1.4315 1.4401 1.4404 1.4571 1.4541 1.4941 1.4845 1.4449 1.4438 1.4550 1.4912 1.4462 1.4410
Yield Strength (Mpa)	≥450；≥485；≥550	≥450；≥450；≥550	—
Tensile Strength (Mpa)	≥620；≥655；≥800	≥620；≥655；≥800	—
Elongation(%)	≥25；≥25；≥15	≥25；≥25；≥15	—
Hydrostatic Test	The Hydrostatic Test shall be in accordance with ASTM A1016.Could be replaced by ECT.	The Hydrostatic Test shall be in accordance with ASTM A999.Could be replaced by ECT.	The hydrostatic test shall be carried out at a test pressure of 7MPa or at a test pressure calculated using the following formula P=2St/D S=70%Rp0.2
Intergranular Corrosion Test	Usually use Pitting Corrosion Test.	Usually use Pitting Corrosion Test.	EN ISO 3651-2 (Optional)
Eddy Current Test	Could be replaced by HT.	Could be replaced by HT.	EN 10246-3

ASTM A789 vs A790 SA789 vs SA790 Difference between A789 and A790

What is ASTM A789 and A790?

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