N80 VS J55

1. The yield strength of N80-1/Q is 173-206Mpa higher than that of J55.

2. The elongation of N80-1/Q is higher than that of J55 on the same sample area.

3. The same specifications, the same sample orientation, the same minimum sample size, the absorption energy of J55 steel grade coupling, coupling blank, coupling material, coupling semi-finished product and accessory material is lower than N80-1/Q steel grade of.

4. J55 and N80-1/Q seamless pipes, coupling blanks, and non-destructive testing methods for welded pipe bodies are different.

5. The steel grade color code of J55 and N80-1/Q is different: the length is greater than or equal to 1.8m, J55 is painted bright green, N80-1 is painted red, N80-Q is painted red, one bright green; the whole coupling , J55 oil casing painted bright green, N80-1 / Q painted red; ribbon, J55 tubing colorless, J55 sleeve a white, N80-1 colorless, N80-Q green.

6. The mark or symbol of the product steel grade is different: the symbol of J55 is "J", the symbol of N80-1 is "N1", and the symbol of N80-Q is "NQ".

7. The heat treatment process of J55 and N80-1/Q is different:
J55: Selected by the manufacturer or according to the order, full length normalized (N), normalized + tempered (N & T) or quenched + tempered (Q & T).
N80-1: Overall and full length heat treatment is mandatory. Normalized (N) or normalized + tempered (N & T) by the manufacturer
N80-Q: Quenching (Q)

8. The distance of welded tube on flattening test board is different.

9. The hydrostatic pressure test is different.

10. The requirements for PSL-2/3 of J55 and N80-1/Q are different.