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.
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 vs EUROPEAN ALLOY PIPE MATERIALS
|Chrome Moly Pipes: Werkstoff vs EN vs 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
|NPS / DN||Over||Under|
|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|
|1/8 to 2 1/2 [6 to 65] incl., all t/D ratios||20.00%||12.50%|
|Above 2 1/2 , t/D < or = 5%||22.50%||12.50%|
|Above 2 1/2 , 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|
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
|Jiangu Chengde Steel Tube Co Ltd. Ltd||China|
|Vallourec Tubes||Germany, France, & Brazil|
|Tenaris||Italy, Mexico, & Argentina|
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!
The tool estimates the price for ASTM A335 pipes manufactured in Europe and Asia, for example:
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