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ASTM A335/A335M

ASTM A335/A335M--Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

ASTM A335 / A335M Grades

Grades	UNS Designation
P1	K11522
P2	K11547
P5	K41545
P5b	K51545
P5c	K41245
P9	S50400
P11	K11597
P12	K11562
P15	K11578
P21	K31545
P22	K21590
P23	K41650
P24	K30736
P36	K21001
P91	K91560

Chemical Composition

Chemical Components (%)

Grade

others

P11

0.05-0.15

0.30-0.60

≤0.025

0.50-1.00

1.0-1.50

0.44-0.65

P12

0.05-0.15

0.30-0.61

≤0.025

≤0.50

0.80-1.25

0.45-0.65

P22

0.05-0.15

0.30-0.60

≤0.025

≤0.50

1.90-2.60

0.87-1.13

P91

0.08-0.12

0.30-0.60

≤0.020

≤0.010

0.20-0.50

8.0-9.50

0.85-1.05

0.18-0.25

0.030-0.070

≤0.40

≤0.02

Cb 0.06-0.10

Ti 0.01max

Zr 0.01max

Heat Treatment Requirements

Grade	UNS Number	Heat Treat Type	Austenitizing/ Solutioning Temperature, min or range °F [°C]	Subcritical Annealing or Tempering Temperature, Min or range °F [°C]
P11	K11597	full or isothermal anneal normalize and temper	…	1200 [650]
P12	K11562	full or isothermal anneal normalize and temper subcritical anneal	…	1200 [650] 1200-1300 [650 to 705]
P22	K21590	full or isothermal anneal normalize and temper	…	1250 [675]
P91	K91560	normalize and temper quench and temper	1900-1975[1040-1080] 1900-1975[1040-1080]	1350-1470[730-800] 1350-1470[730-800]

Tensile Requirements and Hardness:

Mechanical Properties
Grade	Tensile	Yield	Elongation	Hardness
Grade	Strength (Mpa)	Strength (Mpa)	(%)
P11 P12	≥415	≥220	≥30	≤89HRB
P22	≥415	≥200	≥30	≤89HRB
P91	≥585	≥415	≥20	91HRB-25HRC

Flattening Test—One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot

Flaring Test—One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot

Hydrostatic or Nondestructive Electric Test—Each tube shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

ASTM A500/A500M

ASTM A333/A333M

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