China ASTM A335/A335M Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service Suppliers, Factory

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China ASTM A335/A335M Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service Suppliers, Factory

Scope Â
This specification covers seamless ferritic alloy-steel pipes intended for high-temperature service. The pipe is suitable for bending, flanging, and similar forming operations. Grades include P5, P9, P11, P12, P22, P91, P92, P122, etc., with varying chemical compositions and mechanical properties.

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Product Description

Ordering Information

Purchasers must specify the following when ordering:

Quantity (length or number of pipes)

Material grade (e.g., P11, P22, P91)

Size (NPS or DN and schedule or wall thickness)

Length (random or specific)

ASTM designation (A335 or A335M for metric units)

Optional requirements (e.g., additional testing, special finishes)

Any supplementary requirements (S1–S7)

Material and Manufacture

Process: Pipes shall be made by seamless process (hot-worked or cold-worked followed by heat treatment).

Heat Treatment: All pipes must undergo proper heat treatment (e.g., normalization, tempering) to meet mechanical properties.

Chemical Composition

Each grade has specific limits for carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and other alloying elements.

Mechanical Properties

Tensile Strength, Yield Strength, and Elongation: Requirements vary by grade (e.g., P91: min. tensile strength 585 MPa, yield strength 415 MPa).

Hardness Testing: Optional unless specified.

Test Requirements

Hydrostatic Testing: Each pipe must withstand a specified hydrostatic pressure without leakage.

Nondestructive Electric Testing (NDE): Optional unless required (e.g., eddy current, ultrasonic testing).

Flattening Test, Bend Test, or Flange Test: Required for certain sizes and grades.

Impact Testing: Required if specified (e.g., for low-temperature service).

Inspection & Certification

Manufacturer must perform tests and provide a Certificate of Compliance.

Third-party inspection may be required if specified in the purchase order.

Marking

Each pipe must be marked with:

Manufacturer’s name or trademark

ASTM designation (A335 or A335M)

Grade (e.g., P11, P22)

Heat number

Size and schedule

Supplementary Requirements

Optional additional tests (e.g., grain size analysis, special NDE methods) may be specified.

Keywords

Seamless pipe alloy steel high-temperature service ferritic steel P-grade steels

Main Grades in ASTM A335/A335M

Grade	UNS Number	Key Alloy Composition	Common Applications
P1	K11522	0.5Mo	Low-alloy boilers, piping
P2	K11547	0.5Cr-0.5Mo	Power plants, refineries
P5	K41545	5Cr-0.5Mo	High-temp/pressure service
P9	S50400	9Cr-1Mo	Petrochemical, boilers
P11	K11597	1.25Cr-0.5Mo-Si	Power generation, steam lines
P12	K11562	1Cr-0.5Mo	Similar to P11, boilers
P21	K31545	3Cr-1Mo	High-temp strength
P22	K21590	2.25Cr-1Mo	Widely used in power plants
P91	K91560	9Cr-1Mo-V-Nb	Advanced high-temp/pressure
P92	K92460	9Cr-2W-0.5Mo-V-Nb	Ultra-supercritical boilers
P122	K91640	11Cr-2W-1Cu-Mo-V-Nb	High-efficiency power plants

Key Notes:

Grades P5 to P92 are chromium-molybdenum (Cr-Mo) steels, offering increasing resistance to oxidation and creep at elevated temperatures.

P91, P92, and P122 are advanced high-strength steels used in modern power plants for ultra-supercritical (USC) applications.

P1 and P2 are lower-alloy grades for less severe conditions.

These grades are selected based on temperature, pressure, and corrosion resistance requirements in industries like power generation, oil & gas, and petrochemical plants.

Frequently Asked Questions (FAQ)

1. What is the ASTM A335 standard used for?

ASTM A335 is the standard specification for seamless ferritic alloy-steel pipe intended for high-temperature service in industries such as power generation and petrochemicals.

2. What are the most common grades of ASTM A335?

The most frequently used grades are P5, P9, P11, P22, and P91, chosen based on the specific temperature and pressure requirements of the application.

3. Why is P91 steel used in modern power plants?

Grade P91 is an advanced high-strength steel that provides excellent creep strength and resistance to high temperatures, making it ideal for ultra-supercritical (USC) power plant applications.

4. Does ASTM A335 pipe require heat treatment?

Yes, all pipes manufactured under ASTM A335 must undergo specific heat treatments, such as full or isothermal annealing, normalizing, and tempering, to ensure they meet mechanical property standards.

5. What mandatory tests are performed on these pipes?

Mandatory tests typically include hydrostatic testing, flattening tests, and bend tests. Nondestructive electric testing (NDE) or impact testing may also be required depending on the purchase order.

6. Can ASTM A335 pipes be used for low-temperature service?

While designed for high-temperature service, some grades may be used for other applications if impact testing and specific supplementary requirements are met to ensure material integrity.

Product Detail

China ASTM A335/A335M Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service Suppliers, Factory

Product Description

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Product Detail

China ASTM A335/A335M Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service Suppliers, Factory

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