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ASTM A335 P5 Cold Drawing Chrome-Moly Alloy Seamless Steel Tubes
A335 is often called chrome moly pipe because of the chemical makeup of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel as well as the elastic limit, resistance to wear, impact qualities, and hardenability. Moly increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is the most effective single additive that increases high temperature creep strength. It also enhances the corrosion resistance of steel and inhibits pitting. Chromium (or chrome) is the essential constituent of stainless steel. Any steel with 12% or more Chrome is considered stainless. Chrome is virtually irreplaceable in resisting oxidation at elevated temperatures. Chrome raises the tensile, yield, and hardness at room temperatures. The composition of chrome moly alloy steel pipe makes it ideal for use in power plants, refineries, petrochemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.
ASTM A335 Pipe (ASME S/A335, Chrome-Moly) is a seamless ferritic Alloy-Steel Pipe for high-temperature service. Pipe ordered to this specification shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. Sometimes referred to as “P Grade”, chrome moly pipe is popular in P-Grades P5, P9, P11, P22, and P91. The most common use of grades P11, P22, and P91 is in the power industry and petro-chemical plants, Grades P5 and P9 are commonly used in refineries.
Specifications:
Chemical Composition(%):
| Grade | UNS Designation | Composition, % | ||||||||
| Carbon | Manganese | Phosphorus, | Sulfur | Silicon | Chromium | Molybdenum | Others |
| ||
| max | max |
| ||||||||
| P5 | K41545 | 0.15 max | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 4.00–6.00 | 0.45–0.65 | --- |
|
| P9 | S50400 | 0.15 max | 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 | 0.50 max | 0.80–1.25 | 0.44–0.65 | --- |
|
| P22 | K21590 | 0.05–0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.50 max | 1.90–2.60 | 0.87–1.13 | --- |
|
Mechanical Properties:
|
| Grade P11, P22, P5, P9 | Grade P91 | Grade P92 |
| Tensile strength, min, (MPa) | 415 | 585 | 620 |
| Yield strength, min, (MPa) | 205 | 415 | 440 |
| Elongation, min, (%), L/T | 30/20 | 20/… | 20/… |
|
| |||
| Heat Treatment | A / N+T | N+T / Q+T | N+T |
