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Pipe Materials, Pipes, Technical Library

Alloy Steel Pipes (ASTM A335 P1-P91)

Alloy Steel Pipes (ASTM A335 P1-P91)

The ASTM A335 specification covers “Chrome-Moly” seamless pipes in multiple grades (from P1 to P91) featuring remarkable resistance to corrosion, good tensile strength, and resistance at high-temperature service. High wall thickness ASTM A335 P11, P22, and P91 pipes are used in power generation and in downstream oil and gas, P5 and P9 grades are for refinery applications.

 

ASTM A335 pipes are often designated as “Chrome Moly” due to the significant presence of Molybdenum (Mo) and Chromium (Cr) in their alloys.

The addition of Moly increases the strength of the steel and its elastic limit, enhance the steel resistance to wear, its impact qualities, and the hardenability. It also improves the resistance to softening and makes chromium steel less prone to embrittlement.  Molybdenum, a raw material traded at the London Metal Exchange, is the most effective additive to increase the steel high temperature creep strength.  It also enhances the corrosion resistance of steel and prevents pitting.

Chrome is one of the key elements of stainless steel alloys (actually, any metal containing more than 12% of Chrome is classified as such) and is a vital addition to prevent the steel oxidation at elevated temperatures. It enhances the tensile, yield, and hardness at room temperatures.

(source: ASTM)

 

CHEMICAL COMPOSITION ASTM A335 PIPE

ASTM A335 – ASME SA335 alloy pipes are available in multiple grades, from P1 to P92 (and beyond). Grades P11/P22 and P91/92 are typically found in power stations, whereas grade P5 and P9 are more common for application in the petrochemical industry.

ASTM A335
Chrome-Moly Pipe
Grade
UNS

equiv.

C≤ Mn P≤ S≤ Si≤ Cr Mo
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
P5 K41545 0.15 0.30~0.60 0.025 0.025 0.5 4.00~6.00 0.44~0.65
P5b K51545 0.15 0.30~0.60 0.025 0.025 1.00~2.00 4.00~6.00 0.44~0.65
P5c K41245 0.12 0.30~0.60 0.025 0.025 0.5 4.00~6.00 0.44~0.65
P9 S50400 0.15 0.30~0.60 0.025 0.025 0.50~1.00 8.00~10.00 0.44~0.65
P11 K11597 0.05~0.15 0.30~0.61 0.025 0.025 0.50~1.00 1.00~1.50 0.44~0.65
P12 K11562 0.05~0.15 0.30~0.60 0.025 0.025 0.5 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 0.5 2.65~3.35 0.80~1.60
P22 K21590 0.05~0.15 0.30~0.60 0.025 0.025 0.5 1.90~2.60 0.87~1.13
P91 K91560 0.08~0.12 0.30~0.60 0.02 0.01 0.20~0.50 8.00~9.50 0.85~1.05
P92 K92460 0.07~0.13 0.30~0.60 0.02 0.01 0.5 8.50~9.50 0.30~0.60

 

ASTM vs EUROPEAN ALLOY PIPE MATERIALS

Chrome Moly Pipes: Werkstoff vs EN vs ASTM
Werkstoff /DIN EN ASTM
1.5415 16Mo3 A335 Grade P1
1.7335 13CrMo4-5 A335 Grade P11, P12
1.7380 10CrMo9-10 A335 Grade P22
1.7362 X11CrMo5 A335 Grade P5
A335 Grade P9
1.4903 X10CrMoVNb9-1 A335 Grade P91

 

TOLERANCES ASTM ASTM A335 PIPE

DIAMETER TOLERANCE

NPS / DN Over Under
in. mm in. mm
1/8 to 1 1/2 / DN 6 to 40 1/64 (0.015) 0.4 1/64 (0.015) 0.4
Over 1 1/2 to 4 / DN 40 to 100 1/32 (0.031) 0.79 1/32 (0.031) 0.79
Over 4 to 8 / DN 100 to 200 1/16 (0.062) 1.59 1/32 (0.031) 0.79
Over 8 to 12 / DN 200 to 300 3/32 (0.093) 2.38 1/32 (0.031) 0.79
Over 12 / > DN 300 +/- 1% of the specified outside diameter

 

WALL THICKNESS TOLERANCE

NPS / DN Tolerance, % from Specified
Over Under
1/8 to 2 1/2 [6 to 65] incl., all t/D ratios 20.00% 12.50%
Above 2 1/2 [65], t/D < or = 5% 22.50% 12.50%
Above 2 1/2 [65], t/D > 5% 15.00% 12.50%
(t = Specified Wall Thickness; D = Specified Outside Diameter)

 

MECHANICAL PROPERTIES ASTM A335 PIPE

A335 – SA335 Grade Tensile Strength, min., psi Yield Strength, min., psi
ksi MPa ksi MPa
Gr. P5 60 415 30 205
 Gr. P9 60 415 30 205
Gr. P11 60 415 30 205
Gr. P22 60 415 30 205
 Gr. P91 85 585 60 415

 

TESTING REQUIREMENTS ASTM A335 PIPE

  • Transverse/longitudinal: tension and flattening, hardness, bend tests- for material which has been heat-treated in batch furnaces, these tests shall be made on the 5% of the pipes from each heat lot number. For smaller lots, one pipe at a minimum has to be tested
  • ASTM A335 Gr. P91 shall have a hardness of 250 HB / 265 HV (25 HRC)
  • Hydro testing: shall be applied to every length of pipe
  • The non-destructive electric test is optional

 

ASTM A335 PIPE MANUFACTURERS

Pipe Mill Country  
Jiangu Chengde Steel Tube Co Ltd. Ltd China
Chomutov Czech
Eschweiller(Bentler) Germany
Vallourec Tubes Germany, France, & Brazil
Tenaris Italy, Mexico, & Argentina
Sumitomo Metal Japan
JFE Japan
Productos Tubulares Spain
Tubos Reunidos Spain
Wyman Gordon USA
Michigan Seamless USA
Rockwell Collins USA

 

We recommend purchasing the ASTM A335 specification from the ASTM website or the IHS store to get a complete understanding of this topic.

 

ASTM A335 CHROME MOLY PIPE PRICES

Looking for the price of ASTM A335 alloy steel pipes? Click on the image and check our online ASTM A335 pipe price estimation tool!

a335 pipes price

The tool estimates the price for ASTM A335 pipes manufactured in Europe and Asia, for example:

What is a schedule 40 steel pipe price (6 inches, ASTM A335 P91)?

Even if our price estimates are reliable, prices shall always be double checked with ASTM A335 pipe manufacturers and distributors.

 

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