Alloy Steel Pipes & Fittings, Alloy Steel Seamless Pipes, Alloy Steel Tubes, gr p5, p9, P11, P22, P91 Manufacturer, Supplier & Exporter




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ASTM A335 Alloy Steel Seamless Pipes

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:
Element	UNS Designation	K41545	S50400	K11597	K21590	K91560	P-91 shall also include the following:
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