ASTM A335 P9
ASTM A335 P9 - industrial steel pipe
ASTM A335 Grade P9 alloy steel seamless pipe is made from the P9 grade of material that conforms to the ASTM A335 P9 specification.
Download PDFASTM A335 Grade P9 alloy steel seamless pipe is a type of seamless ferritic alloy-steel pipe made from the P9 grade of material that conforms to the ASTM A335 P9 specification. The grade designation indicates that the material used in the pipe meets certain minimum requirements for chemical composition, tensile strength, and other mechanical properties.
ASTM A335 Grade P9 alloy steel seamless pipe is commonly used in applications that require high-temperature and high-pressure resistance, such as in power generation, petrochemical plants, and oil and gas refineries.
Some key features and benefits of ASTM A335 Grade P9 alloy steel seamless pipe include:
In conclusion, ASTM A335 Grade P9 alloy steel seamless pipe is a type of seamless ferritic alloy-steel pipe made from P9 material that conforms to the ASTM A335 P9 specification. It is designed for use in high-temperature and high-pressure environments and offers excellent strength, corrosion resistance, and durability. The grade designation indicates that the material meets specific requirements for chemical composition and mechanical properties.
ASTM A335 P9 is a specialized seamless ferritic alloy steel pipe for high-temperature service. It is commonly used in power plants and petrochemical industries for applications requiring high-temperature resistance and toughness. The chemical composition includes chromium, molybdenum, and vanadium, which provide excellent corrosion resistance, high strength, and good weldability. ASTM A335 P9 has a maximum working temperature of 600°C and a maximum operating pressure of 65 bar.
ASTM A335 P9 is the part of ASTM A335, The pipe shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. The steel material shall conform to chemical composition, tensile property, and hardness requirements.
The range of ASTM A335 P9 alloy steel pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practice.
Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
The range of ASTM A335 P9 pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practice.
The different mechanical test requirements for pipes, namely, transverse or longitudinal tension test, flattening test, and hardness or bend test are presented.Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
| Compositions | Data |
|---|---|
| UNS Designa-tion | K41545 |
| Carbon(max.) | 0.15 |
| Manganese | 0.30-0.60 |
| Phosphorus(max.) | 0.025 |
| Sulfur(max.) | 0.025 |
| Silicon(max.) | 0.50 |
| Nickel | … |
| Chromium | 4.00-6.00 |
| Molybdenum | 0.45-0.65 |
| Other Elements | … |
| Properties | Data |
|---|---|
| Tensile strength, min, (MPa) | 415 Mpa |
| Yield strength, min, (MPa) | 205 Mpa |
| Elongation, min, (%), L/T | 30/20 |
ASTM A335 is a standard specification for seamless ferritic alloy-steel pipe intended for high-temperature service.
This material is commonly used in power plants, refineries, and other industrial settings where high-temperature and high-pressure conditions are encountered. The "A" in ASTM A335 stands for "alloy," indicating that the pipe is made from alloy steel, which typically includes elements such as chromium, molybdenum, and sometimes vanadium to enhance its high-temperature properties.
ASTM A335 pipes are available in various grades, such as P1, P2, P5, P9, P11, P22, P91, and P92, each with specific chemical compositions and mechanical properties to suit different applications. These pipes are designed to withstand high temperatures and pressures while maintaining their strength and integrity over time.
1 This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service. 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.
2 Several grades of ferritic steels (see Note 1) are covered. Their compositions are given in Table 1.
Note 1. Ferritic steels in this specification are defined as low- and intermediate-alloy steels containing up to and including 10% chromium.
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.
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 the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
Note The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as "nominal diameter", "size", and "nominal size".
ASTM A335 Seamless Steel Pipe is generally named chrome moly pipe for the chemical elements- Molybdenum and Chromium. Molybdenum improves steel performances as steel strength, elastic limit, wear resistance, impact and hardenability.
ASTM A335 seamless steel pipe is a popular choice for high-temperature applications due to several key reasons:
In summary, ASTM A335 seamless steel pipe is popular in high-temperature applications due to its high-temperature resistance, corrosion resistance, high strength, good weldability, uniform properties, and cost-effectiveness. Its combination of properties makes it an ideal choice for use in various high-temperature and high-pressure applications, especially in the power generation, chemical processing, and oil and gas industries.
ASTM Specification pipe confirming to ASTM A335 shall have the following chemical properties. Tensile and Hardness Requirements The tensile properties of the ASTM A335 pipe shall conform to the requirements as prescribed. Pipe of Grades P91, P92, and P122 shall have a hardness not exceeding 250 HB/265 HV [25 HRC]. For pipe of Grades P91, P92, P122, and P911, Brinell, Vickers, or Rockwell hardness tests shall be made on a specimen from each lot (see Note 7). These pipe bear high resistance to rupture at high temperature and pressures. With hydrogen crack resistance and sulfide stress corrosion cracking chrome moly pipe are highly preferred over Carbon pipe.
| Grade | C | Mn | P max | S max | Si | Cr | Mo | V | N | Others |
|---|---|---|---|---|---|---|---|---|---|---|
| P1 | 0.1-0.2 | 0.3-0.8 | 0.025 | 0.025 | 0.1-0.5 | 1.0-1.5 | 0.44-0.65 | / | / | / |
| P2 | 0.1-0.2 | 0.3-0.61 | 0.025 | 0.025 | 0.1-0.3 | 0.5-0.81 | 0.44-0.65 | / | / | / |
| P5 | ≤0.15 | 0.3-0.6 | 0.025 | 0.025 | ≤0.5 | 4.0-6.0 | 0.45-0.65 | / | / | / |
| P5b | ≤0.15 | 0.3-0.6 | 0.025 | 0.025 | 1.0-2.0 | 4.0-6.0 | 0.45-0.65 | / | / | / |
| P5c | ≤0.12 | 0.3-0.6 | 0.025 | 0.025 | ≤0.5 | 4.0-6.0 | 0.45-0.65 | / | / | / |
| P9 | ≤0.15 | 0.3-0.6 | 0.025 | 0.025 | 0.25-1.0 | 8.0-10.0 | 0.9-1.1 | / | / | / |
| P11 | 0.05-0.15 | 0.3-0.6 | 0.025 | 0.025 | 0.5-1.0 | 1.0-1.5 | 0.44-0.65 | / | / | / |
| P12 | 0.05-0.15 | 0.3-0.61 | 0.025 | 0.025 | ≤0.5 | 0.8-1.25 | 0.44-0.65 | / | / | / |
| P15 | 0.05-0.15 | 0.3-0.6 | 0.025 | 0.025 | 1.15-1.65 | / | 0.44-0.65 | / | / | / |
| P21 | 0.05-0.15 | 0.3-0.6 | 0.025 | 0.025 | ≤0.5 | 2.65-3.35 | 0.8-1.06 | / | / | / |
| P22 | 0.05-0.15 | 0.3-0.6 | 0.025 | 0.025 | ≤0.5 | 1.9-2.6 | 0.87-1.13 | / | / | / |
| P23 | 0.04-0.1 | 0.1-0.6 | 0.03 | 0.01 | ≤0.5 | 1.9-2.6 | 0.05-0.3 | 0.2-0.3 | ≤0.015 | Cb(0.02-0.08) ,B(0.001-0.006) |
| Al(≤0.03), W(1.45-1.75) | ||||||||||
| Ni(≤0.4), Ti(0.005-0.060) | ||||||||||
| P24 | 0.05-0.1 | 0.3-0.7 | 0.02 | 0.01 | 0.15-0.45 | 2.2-2.6 | 0.9-1.1 | 0.2-0.3 | ≤0.012 | Ti(0.06-0.1), Al(≤0.02) |
| B(0.0015-0.007) | ||||||||||
| P36 | 0.1-0.17 | 0.8-1.2 | 0.03 | 0.025 | 0.25-0.50 | ≤0.30 | 0.25-0.50 | ≤0.02 | ≤0.02 | Ni(1.0-1.3), Cu(0.5-0.8) |
| Cb(0.015-0.045), Al(≤0.050) | ||||||||||
| P91 | 0.08-0.12 | 0.3-0.6 | 0.02 | 0.01 | 0.2-0.5 | 8.0-9.5 | 0.85-1.05 | 0.18-0.25 | 0.03-0.07 | Ni(≤0.4), Al(≤0.02), Cb(0.06-0.1) |
| Ti(≤0.01), Zr(≤0.01) | ||||||||||
| P92 | 0.07-0.13 | 0.3-0.6 | 0.02 | 0.01 | ≤0.50 | 8.5-9.5 | 0.3-0.6 | 0.15-0.25 | 0.03-0.07 | Ni(≤0.4), AL(≤0.02), Cb(0.04-0.09) |
| W(1.5-2.0), B(0.001-0.006) | ||||||||||
| Ti(≤0.01), Zr(≤0.01) | ||||||||||
| P122 | 0.07-0.14 | ≤0.7 | 0.02 | 0.01 | ≤0.50 | 10.0-11.5 | 0.25-0.6 | 0.15-0.3 | 0.04-0.1 | Ni(≤0.5), Al(≤0.02), Ti(≤0.01) |
| W(1.5-2.5), Cu(0.3-1.7), Zr(≤0.01) | ||||||||||
| Cb(0.04-0.1), B(0.0005-0.005) | ||||||||||
| P911 | 0.09-0.13 | 0.3-0.6 | 0.02 | 0.01 | 0.1-0.5 | 8.5-9.5 | 0.9-1.1 | 0.18-0.25 | 0.04-0.09 | Ni(≤0.4), Cb(0.06-0.1) |
| B(0.0003-0.006),Al(≤0.02) | ||||||||||
| W(0.9-1.1),Ti(≤0.01),Zr(≤0.01) |
ASTM A335 pipe may be either hot finished or cold drawn with the finishing treatment as required in Grade P2 and P12 – The steel shall be made by coarse- grain melting practice. Specific limits, if any, on grain size or deoxidation practice shall be a matter of agreement between the manufacturer and purchaser.
| Werkstoff /DIN | EN | ASTM |
|---|---|---|
| 1.5415 | 16Mo3 | A335 Grade P1 |
| 1.7335 | 13CrMo4-5 | A335 Grade P11, P12 |
| 1.738 | 10CrMo9-10 | A335 Grade P22 |
| 1.7362 | X11CrMo5 | A335 Grade P5 |
| A335 Grade P9 | ||
| 1.4903 | X10CrMoVNb9-1 | A335 Grade P91 |
| Tensile Strength, min., psi | P-5 | P-9 | P-11 | P-22 | P-91 |
|---|---|---|---|---|---|
| ksi | 60 | 60 | 60 | 60 | 85 |
| MPa | 415 | 415 | 415 | 415 | 585 |
| Yield Strength, min., psi | |||||
| ksi | 30 | 30 | 30 | 30 | 60 |
| MPa | 205 | 205 | 205 | 205 | 415 |
Product Analysis At the request of the purchaser, an analysis of two pipe from each lot shall be made by the manufacturer. A lot of ASTM A335 pipe shall consist of the following: NPS Designator Under 2 400 or fraction thereof 2 to 5 200 or fraction thereof 6 and over 100 or fraction thereof. Note: ASTM A335 P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
| Grade | Tensile strength | Yield strength |
|---|---|---|
| P1,P2 | 380 | 205 |
| P12 | 415 | 220 |
| P23 | 510 | 400 |
| P91 | 585 | 415 |
| P92,P11 | 620 | 440 |
| P122 | 620 | 400 |
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 chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.
| Grade | Heat Treatment Type P5, P9, P11, and P22 |
Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering Temperature Range F [C] |
|---|---|---|---|
| A335 P5 (b,c) | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| Subcritical Anneal (P5c only) | ***** | 1325 – 1375 [715 - 745] | |
| A335 P9 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| A335 P11 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1200 [650] | |
| A335 P22 | Full or Isothermal Anneal | ||
| Normalize and Temper | ***** | 1250 [675] | |
| A335 P91 | Normalize and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
| Quench and Temper | 1900-1975 [1040 - 1080] | 1350-1470 [730 - 800] |
With years of expertise, we provide a wide range of steel tube processing services. From basic sawing and machining to complex bending and upsetting operations, we support you at every stage of your project.
Our capabilities include eccentricity reduction and concentricity improvement through turning and grinding. We specialize in creating complex geometries using rotary swaging and axial forming, and offer property modifications through partial heat treatment to meet your exact requirements.
A range to meet your needs
High-quality steel solutions for diverse mechanical engineering applications – reliable, precise, and built for performance.
Premium steel products for demanding construction projects – from bridges to offshore structures, built to last.
Versatile components for the automotive industry – precision, quality, and processing expertise for every application.
Robust tubes for plant engineering and energy systems – designed for extreme conditions and long-term efficiency.
Versatile solutions for modern infrastructure – supporting reliable supply networks and large-scale construction projects.
Versatile solutions for hydraulic systems – durable, pressure-resistant, and engineered for maximum reliability.
| Condition | Typical Application |
|---|---|
| High Temperature | Boilers, superheaters, steam headers |
| Low Temperature | Cryogenic processing systems |
| High Pressure | Power & process piping |
| Corrosive Media | Chemical & petrochemical plants |
| Creep Service | Thermal power stations |
| Product | Specification |
|---|---|
| Seamless Pipes | ASTM A335 P1 / P5 / P9 / P11 / P22 / P91 |
| Butt Weld Fittings | ASTM A234 WP1 / WP5 / WP9 / WP11 / WP22 / WP91 |
| Forged Fittings & Flanges | ASTM A182 F1 / F5 / F9 / F11 / F22 / F91 |
Sunny Steel supplies alloy steel piping systems worldwide, supporting projects that demand certified materials, full traceability and long-term operational reliability.
Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test, non-destructive test, hydrostatic test.
Identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.
Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).
| Term | Symbol | Explanation |
|---|---|---|
| Cold-finished/hard (cold-finished as-drawn) | BK | No heat treatment after the last cold-forming process. The tubes therefore have only low deformability. |
| Cold-finished/soft (lightly cold-worked) | BKW | After the last heat treatment there is a light finishing pass (cold drawing). With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
| Annealed | GBK | After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
| Normalized | NBK | The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum. |
The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.
Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.
Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.
Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for seaworthy delivery or as requested.
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work: prevent rusting and sea transportation security.
Our packing can meet any needs of the customers.
Commonly used alloying elements and their effects are listed in the table given below.
| Alloying Elements | Effect on the Properties |
|---|---|
| Chromium | Increases Resistance to corrosion and oxidation. Increases hardenability and wear resistance. Increases high temperature strength. |
| Nickel | Increases hardenability. Improves toughness. Increases impact strength at low temperatures. |
| Molybdenum | Increases hardenability, high temperature hardness, and wear resistance. Enhances the effects of other alloying elements. Eliminate temper brittleness in steels. Increases high temperature strength. |
| Manganese | Increases hardenability. Combines with sulfur to reduce its adverse effects. |
| Vanadium | Increases hardenability, high temperature hardness, and wear resistance. Improves fatigue resistance. |
| Titanium | Strongest carbide former. Added to stainless steel to prevent precipitation of chromium carbide. |
| Silicon | Removes oxygen in steel making. Improves toughness. Increases hardness ability |
| Boron | Increases hardenability. Produces fine grain size. |
| Aluminum | Forms nitride in nitriding steels. Produces fine grain size in casting. Removes oxygen in steel melting. |
| Cobalt | Increases heat and wear resistance. |
| Tungsten | Increases hardness at elevated temperatures. Refines grain size. |
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
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