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What’s The Differance Between P91 Steel And P92 Steel?

Shannxi Shew-E Steel Pipe Co.,Ltd | Updated: Jan 30, 2019

Based on P91 steel, Nippon steel developed a higher grade of NF616 (T/P92) heat-resistant steel, which is now widely used in ultra-supercritical units. SA335-P92 steel is a new type of steel developed by adding W element and reducing Mo element based on P91 steel. It has excellent corrosion resistance, oxidation resistance and good high temperature strength, creep performance, its thermal fatigue resistance is better than the austenitic stainless steel. However, it is difficult to weld and easy to produce crack defects. P92 have strict technical requirements for preheating, welding current, interlayer thickness, weld width, post-welding treatment, etc. Shew -e steel here to show you the distinction between P92 and P91 steel.

 

Firstly, the main differanceis the chemical composition showed below:

Grades

C

Mn

P,≤

S,≤

Si

Cr

Mo

W

P91

0.07-0.13

0.3-0.6

0.02

0.01

0.2-0.5

8.0-9.5

0.85-1.05

/

P92

0.07-0.13

0.3-0.6

0.02

0.01

0.2-0.5

8.0-9.5

0.35-0.55

1.5-2.00

 

The chemical elemnet differance lead to that P92 have better physical property. P91 has higher temperature creep fracture strength. The normal temperature strength and high temperature strength of P92 steel are higher than P91 steel. High temperature strength of P92 steel at 590 ℃ ~ 650 ℃, silmilar as TP347H steel which high temperature creep performance than 30% higher than that of P91. In accordance with the ASME standards, in 550 ℃, 600 ℃ and 625 ℃, 100000 hours under different temperature experiment, the creep rupture strength of P92 steel respectively are 199 Mpa, 131 Mpa and 101 Mpa; The creep fracture strength of P91 steel at the corresponding temperature respectively is 141MPa, 98MPa and 68MPa. At the same time, P92 has lower welding crack sensitivity. P91 steel preheat to 180 ℃ crack rate is zero, P92 steel preheat to 100 ℃, while P22 steel achieves just to be preheated to 300 ℃.

SA335P92 steel pipe have various alloy element. The high content of Cr, Mo and W elements in the P92 steel make it more difficult to weld, it's easy to produce a joint low impact energy and long-term operation of type IV premature failure of the craze, if the welding quality is not assured, P92 advantage will disappear and will threat the unit operation security. 


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