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ASTM A335 / ASME SA335 / Seamless Ferritic Alloy Steel Pipe for High Temperature Service supplier & distributor in India

PIPE & TUBE ASTM STANDARDS

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ASTM A 335M-89a / ASME SA 335 

SEAMLESS FERRITIC ALLOY STEEL PIPE FOR HIGH TEMPERATURE SERVICE

This standard is issued under the fixed designation A 335/A 335M; the number immediately following the designation 

indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses 

indicates the year of last reapproval. 

A superscript epsilon ( ε) indicates an editorial change since the last revision or reapproval. 


1.Scope 

1.1This specification covers nominal (average) wall seamless alloy-steel pipe intended for high-temperature service (Mote 1).

Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, 
and for fusion welding. Selection will depend upon design, service conditions, mechanical properties,
and high-temperature characteristics. 

NOTE 1 ? Appendix X1 lists the sizes and wall thicknesses of pipe which may be obtained under current commercial practice.

1.2 Several grades of ferritic steels (Note 2) are covered. Their compositions are given in Table 1.

NOTE 2?Ferritic steels in this specification are defined as low and intermediate-alloy steels containing up to and including 

1.3 Supplementary requirements (S1 to S7) of an optional nature are provided. These supplementary requirements call for 
additional tests to be made, and when desired, shall be so stated in the order together with the number of such tests required.

1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text,
the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with specification.

The inch-pound units shall apply unless the "M" designation of this specification is specified in the order. 

NOTE 3?The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such
traditional terms as "nominal diameter," "size," and "nominal size." 

Grade Remaks
(Similar to JIS)
P1 (STPA12)
P2 (STPA20)
P5 (STPA25)
P5b -
P5c -
P7 -
P9 (STPA26)
P11 (STPA23)
P12 (STPA22)
P15 -
P21 -
P22 (STPA24)
P91 -



Chemical Requirements 

Grade UNS
DesignationA
Composition,% Others
Carbon Manganese Phosphorus,max Sulfur,max Silicon Chromium Molybdenum
P1 K11522 0.10-0.20 0.30-0.80 0.025 0.025 0.10-0.50 ... 0.44-0.65 ...
P2 K11547 0.10-0.20 0.30-0.61 0.025 0.025 0.10-0.30 0.50-0.81 0.44-0.65 ...
P3 K41545 0.15max 0.30-0.60 0.025 0.025 0.50MAX 4.00-6.00 0.45-0.65 ...
P5b K51545 0.15max 0.30-0.60 0.025 0.025 1.00-2.00 4.00-6.00 0.45-0.65 ...
P5c K41245 0.12max 0.30-0.60 0.025 0.025 0.50MAX 4.00-6.00 0.45-0.65 ...B
P9 S50400 0.15max 0.30-0.60 0.025 0.025 0.25-1.00 8.00-10.00 0.90-1.10 ...
P11 K11597 0.05-0.15 0.30-0.60 0.025 0.025 0.50-1.00 1.00-1.50 0.44-0.65 ...
P12 K11562 0.05-0.15 0.30-0.61 0.025 0.025 0.50MAX 0.80-1.25 0.44-0.65 ...
P15 K11578 0.05-0.15 0.30-0.60 0.025 0.025 1.15-1.65 ... 0.44-0.65 ...
P21 K31545 0.05-0.15 0.30-0.60 0.025 0.025 0.50max 2.65-3.35 0.80-1.06 ...
P22 K21590 0.05-0.15 0.30-0.60 0.025 0.025 0.50max 1.90-2.60 0.87-1.13 ...
P91 K91560 0.08-0.12 0.30-0.60 0.020 0.010 0.20-0.50 8.00-9.50 085-1.05 ...
V 0.18-0.25
N0.030-0.070
Ni 0.40max
Cb 0.06-0.10



ANew designation established in accordance with Practuce E 527 and SAE J1086,

Practice for Numbering Metals and Alloys (UNS).

BGrade P5c shall have a titanium content of not less than 4 times the carbon content and not more than 0.70%, 

or a columbium content of 8 to 10 times the carbon content.

At the request of the purchaser, an analysis of two pipes from each lot shall be made by the manufacturer. 

A lot (Note 6) of pipe shall consist of the following :

NPS Designatior  
Under 2 400 or fraction thereof
2 to 5 200 or fraction thereof
6 and over 100 or fraction thereof


NOTE 6 - A lot shall consist of the number of lengths specified in 7.1 of the same size 

and wall thickness from any one heat of steel. 


Tensile Requriements
 

Identification Symbol P1, P2 P12 P91 All Others
Tensile strength, min;
ksi 55 60 85 60
MPa 380 415 585 415
Yield strength, min;
ksi 30 32 30 30
MPa 205 220 415 205
  Elongation
Requriements, 
All grades
except P91
P91
  Longitudinal Transverse Longitudinal Transverse
Elongation in 2 in.or 50mm, (or 4D),
min, %:
Basic minimum elongation for wall 5/16 in.[8mm]
and over in thickness, strip tests, and for all small 
sizes tested in full section
30 20 20 ...
When standard round 2-in. or 50-mm
gage length or proportionally smaller
size specimen with 4D (4 times the diameter) is used
22 14 20 13
For strip tests a deduction for each 1/32-in.
[0.8mm] decrease in wall thickness below 
5/16 in.[8mm] from the basic minimum elongation 
of the following percentage points shall be made
1.50As 1.00A 1.00A ...
AThe following table gives the calculated minimum values :
Wall Thickness Elongation in 2 in. or 50mm, min, %
All grades except P91 P91
in. mm Longitudinal Transeverse Longitudinal
5/16 (0.312) 8 30 20.0 20
9/32(0.281) 7.2 29 19.0 19
1/4(0.250) 6.4 27 18.0 18
7/32(0.219) 5.6 26 ... 17
3/16(0.188) 4.8 24 ... 16
5/32(0.156) 4 22 ... 15
1/8(0.125) 3.2 21 ... 14
3/32(0.094) 2.4 20 ... 13
1/16(0.062) 1.6 18 ... 12


NOTE - This table gives the computed minimum elongation values for each 1/32-in.[0.8mm] 
decrease in wall thickness. 

Where the wall thickness lies between two values above,

the minimum elongation value is determined by the following formula : 

Direction of Test EquationB
Longitudinal, all grades except P91 E = 48t + 15.00
[E = 1.87t + 15.00]
Transverse E = 32t + 10.00
[E = 32t + 10.00]
Longitudinal, P91 E = 32t + 10.00
[E = 1.25t + 10.00]



where : E = elongation in 2 in. or 50 mm, %, and
t = actual thickness of specimens, in. [mm].

BCalculated elongation requirmeent shall be rounded to the nearest whode number.

Drilled Hole- The reference standard shall contain three or more holes, equally spaced circumferentially around the pipe
and longitudinally separated by a sufficient distance to allow distinct identificatin of the singnal from each hole. 
The holes shall be drilled radially and completely throuh the pipe wall, with care being taken to avoid distortion of the pipe 
while drilling. The hole diameter shall vary with NPS as follows :

NPS Designator Hole Diameter
1/2 0.039 in. (1mm)
above 1/2 to 1 1/4 0.055 in.(1.4mm)
above 1 1/4 to 2 0.071 in. (1.8mm)
above 2 to 5 0.087 in.(2.2mm)
above 5 0.106 in.(2.7nn)



Test Method Information for Certification and Marking

Hydrostatic Nondstructive Marking
YES NO Test Pressure
NO YES NDE
NO NO NH
YES YES Test Pressure/NDE

Grade Uns Designation
P11 K11597
P22 K21590
P5 K41545



Part Number; 

Pipe shall be ordered to nominal pipe size and schedule specified in ANSI B36.10.

Example : A335 Pipe P-11 NPS 12 Sch 40 Specification Number.............................................ASTM A 335

Pipe......................................................................P
Grade....................................................................P-11 
NPS......................................................................12
Wall.....................................................................0.375 

16.1.4.2 Specification Number.......................ASTM A 335
Tube.....................................................................T
Grade....................................................................P-11 
Outside Diameter...................................................0.250
Wall......................................................................0.035 

16.1.5 Ordering Information - Orders for material under this specification shall include the following in addition 

to the requirements of Section 3 : 16.1.5.1 Pipe or tube, 16.1.5.2 Part number, 16.1.5.3 Ultrasonic inspection, 

if required, 16.1.5.4 If shear wave test is to be conducted in two oppositie circumferential directions, and 16.1.5.5 Level 

of preservation and packing reuired.   


APPENDIX (Nonmandatory Information) X1. SIZE RANGE AND WALL THICKNESSES OF GRADES P2 AND P12


X1.1 TableX1.1 constitutes the range of sizes and wall thicknesses of pipe ingrades P2 and P12 that are generally obtainable. 

X1.2 For length ranges of pipe NPS 8 and under, see 9.1 The length ranges shown in the following table for pipe NPS 10 and 

larger are representative of the present known capacities of the mills. See 9.1 for details.

TABLE X1.1 Size and Wall Thickness Ranges

NPS Designator Outside Diameter Nominal Wall Thicknes
Schedule 100 Schedule 120 Schedule 160
Wall Thickness Length Range Wall Thickness Length Range Wall Thickness Length Range
Inch-Pound
in. in. ft in. ft in. ft
1/2 0.840 ... ... ... ... 0.187 ...
3/4 1.050 ... ... ... ... 0.218 ...
1 1.315 ... ... ... ... 0.250 ...
1 1/4 1.660 ... ... ... ... 0.250 ...
2 2.375 ... ... ... ... 0.343 ...
2 1/2 2.875 ... ... ... ... 0.375 ...
3 3.500 ... ... ... ... 0.438 ...
4 4.500 ... ... 0.438 ... 0.531 ...
6 6.625 ... ... 0.562 ... 0.718 ...
8 8.625 0.593 ... ... ... 0.906 ...
10 10.700 0.718 25 to 30 ... ... 1.125 15 to 25
12 12.700 0.843 20 to 30 ... ... 1.312 15 to 25
14 14.000 0.937 20 to 30 ... ... 1.406 15 to 25
16 16.000 1.031 18 to 30 ... ... 1.593 10 to 25
Sl Units
in. in. ft in. ft in. ft
1/2 21.34 ... ... ... ... 4.76 ...
3/4 26.67 ... ... ... ... 5.56 ...
1 33.40 ... ... ... ... 6.35 ...
1 1/4 42.16 ... ... ... ... 6.35 ...
2 60.33 ... ... ... ... 8.73 ...
2 1/2 73.03 ... ... ... ... 9.53 ...
3 88.90 ... ... ... ... 11.11 ...
4 114.3 ... ... 11.11 ... 13.49 ...
6 168.3 ... ... 14.29 ... 18.26 ...
8 219.1 15.8 ... ... ... 23.02 ...
10 273.1 18.26 7.6 to 9.1 ... ... 28.58 4.6 to 7.6
12 323.9 21.43 6.1 to 9.1 ... ... 33.33 4.6 to 7.6
14 356.6 23.81 6.1 to 9.1 ... ... 35.72 4.6 to 7.6
16 406.4 26.19 5.5 to 9.1 ... ... 40.46 3.0 to 7.6



JIS Number and Corrensponding Foreign Standards

JIS ASTM BS DIN
Standard Number   Grade   Type   Standard Number   Grade   Type   Standard Number   Grade   Type   Standard Number   Grade   Type  
G3458 STPA12 Mo A335 P1 Mo
STPA20 CrMo A335 P2 CrMo
STPA22
  


CrMo A355 P12 CrMo 3604 HFS620-460 CrMo 17175 13CrMo44 CrMo
" CFS620-460 CrMo
" ERW620-460 CrMo
" CEW620-460 CrMo
" HFS620-440 CrMo
" CFS620-440 CrMo
" ERW620-440 CrMo
" CEW620-440 CrMo
STPA23
CrMo A355 P11 CrMo 3604 HFS621 CrMo      
" CFS621 CrMo
" ERW621 CrMo
" CEW621 CrMo
STPA24 CrMo A355 P22 CrMo 3604 HFS622 CrMo 17175 10CrMo910 CrMo
" CFS622 CrMo
STPA25 CrMo A355 P5 CrMo 3604 HFS625 CrMo
" CFS625 CrMo
STPA26 CrMo A355 P9 CrMo 3604 HFS629-470 CrMo
" CFS629-470 CrMo

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