Alloy Steel Pipes & Tubes

 

This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high temperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding.

 

Heat Treatment

Grade 
P5, P9, P11, and P22
Heat Treatment Type
Normalizing Temperature Range F [C] Subcritical Annealing or Tempering Temperature Range F [C]
P5 (b,c) Full or Isothermal Anneal    
  Normalize and Temper
Subcritical Anneal (P5c only)
*****
*****
1250 [675]
1325 - 1375 [715 - 745]
P9 Full or Isothermal Anneal    
  Normalize and Temper ***** 1250 [675]
P11 Full or Isothermal Anneal    
  Normalize and Temper ***** 1200 [650]
P22 Full or Isothermal Anneal    
  Normalize and Temper ***** 1250 [675]
P91 Normalize and Temper
Quench and Temper
1900-1975 [1040 - 1080]
1900-1975 [1040 - 1080]x
1350-1470 [730 - 800]
1350-1470 [730 - 800]

Chemical Requirements

Element Grade P-5 P-9 P-11 P-22 P-91 P-91 shall also include the following:
UNS Designation K41545 S50400 K11597 K21590 K91560
Carbon 0.15 max 0.15 max 0.05 - 0.15 0.05 - 0.15 0.08 - 0.12 V at 0.18 - 0.25
Manganese 0.30 - 0.60 0.30 - 0.60 0.30 - 0.60 0.30 - 0.60 0.30 - 0.60 N at 0.030 - 0.070
Phosphorous, max 0.025 0.025 0.025 0.025 0.020 Ni at 0.40 max
Sulfur, max 0.025 0.025 0.025 0.025 0.010 Al at 0.02 max
Silicon 0.50 max 0.25 - 1.00 0.50 - 1.00 0.50 max 0.20 -0.50 Cb at 0.06 - 0.10
Chromium 4.00 - 6.00 8.00 - 10.00 1.00 - 1.50 1.90 - 2.60 8.00 - 9.50 Ti at 0.01 max
Molybdenum 0.45 -0.65 0.90 - 1.10 0.44 - 0.65 0.87 - 1.13 0.85 - 1.05 Zr at 0.01 max

 





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