Descriptions of ASTM A335 P11 Alloy Steel Pipe

The P11 Pipe, commonly known as chrome moly pipe, is engineered for exceptional performance in high-temperature and high-pressure environments. This seamless pipe features a robust composition of chromium and molybdenum, which significantly enhances its oxidation resistance, ensuring durability and reliability.

Chromium improves high-temperature strength and increases tensile, yield, and hardness at room temperature, making the pipe ideal for demanding applications. On the other hand, molybdenum enhances overall strength, elasticity, and wear resistance, while effectively reducing the risk of embrittlement and softening. This unique composition allows the pipe to withstand extreme temperatures, ensuring longevity and high performance under intense conditions.

The ASTM A335 P11 pipe is also known for its enhanced corrosion resistance, which inhibits pitting and further extends the service life of the pipe. For those seeking high-quality and reliable alloy steel pipes, our products meet stringent industry standards and performance requirements.

At MULTISTEEL, we maintain a substantial inventory of ASTM A335 P11 alloy steel pipes, allowing for fast delivery to meet your urgent needs. We offer customization options based on customer requirements and accept bulk purchase orders to accommodate large-scale projects.

Technical Specifications of P11 Pipe

Chemical  Composition

Mechanical Properties

Applications of P11 Seamless Pipe

• Power Generation: Used in boiler systems, superheaters, and reheaters for steam generation and distribution due to its high-temperature and pressure capabilities.

• Petrochemical Industry: Employed in refining processes, heat exchangers, and pipelines that transport oil and gas, where resistance to corrosion and high temperatures is crucial.

• Chemical Processing: Utilized in reactors, distillation columns, and other equipment requiring materials that can withstand harsh chemical environments and high pressures.

• Aerospace and Aviation: Applied in turbine engines and components where high strength and temperature resistance are essential for safety and performance.

• Nuclear Power Plants: Used in piping systems and components exposed to high temperatures and radiation, benefiting from its durability and corrosion resistance.

Why Choose MULTISTEEL?

MULTISTEEL specializes in producing and processing a wide range of precison steel pipes and tubes, including carbon, alloy, and stainless steel pipes and tubes, all compliant with international standards. As a direct manufacturer  with thousands of tons of ready stock, MULTISTEEL ensures competitive pricing and fast delivery, offering various processing services to meet customer specifications. Committed to quality and customer satisfaction, MULTISTEEL has earned a strong reputation both domestically and internationally.

• Quality Assurance: Rigorous testing and quality control processes to ensure product reliability.

• Flexible Ordering: Minimum order quantity of just 1 ton, accommodating various customer needs.

• Fast Delivery: Quick turnaround times of 5-7 days for in-stock items and 30-45 days for custom orders.

• Customer Support: Dedicated 15-member, 7×24 hours after-sales service team for responsive assistance.

• Satisfaction Guarantee: Offers refunds or replacements for faulty products, ensuring customer confidence.

FAQs

1. What is ASTM A335 P11?

ASTM A335 P11 is a specification for seamless ferritic alloy steel pipes intended for high-temperature service, primarily in applications such as power generation and petrochemical industries. It is characterized by its chromium and molybdenum content, which enhances its strength and resistance to oxidation.

2. What is the hardness of ASTM A335 P11?

The hardness of ASTM A335 P11 typically does not exceed 250 HB (Brinell hardness) or 265 HV (Vickers hardness) when subjected to standard conditions. Post-weld heat treatment (PWHT) may further reduce the hardness, with values generally not exceeding 225 HB after treatment

3. What is the difference between A335 P11 and P12?

The main differences between A335 P11 and P12 include:

• Chromium Content: P11 contains 1.00% – 1.50% chromium, while P12 has 1.25% – 1.65%.

• Temperature Range: P11 is suitable for temperatures up to 600°C, whereas P12 can handle up to 650°C.

• Creep Resistance: P12 generally offers better creep resistance at elevated temperatures due to its higher chromium content.

4. What is the yield strength of ASTM A335 P11?

The yield strength of ASTM A335 P11 is approximately 205 MPa (30 KSI).

5. Is P11 a low alloy steel?

Yes, ASTM A335 P11 is classified as a low alloy steel due to its composition, which includes significant amounts of chromium and molybdenum that enhance its mechanical properties.

6. What is the temperature range for A335 P11?

ASTM A335 P11 is designed for high-temperature applications, with a maximum service temperature of 600°C.

7. Does P11 require PWHT?

Yes, ASTM A335 P11 requires post-weld heat treatment (PWHT) to relieve residual stresses and improve mechanical properties. The recommended PWHT temperature range is between 650°C and 705°C.

8. What are the properties of A335 P11?

Key properties of ASTM A335 P11 include:

• Chemical Composition: Contains carbon, manganese, phosphorus, sulfur, silicon, chromium (1.00% – 1.50%), and molybdenum (0.44% – 0.65%).

• Mechanical Properties:

• Yield Strength: Minimum 205 MPa (30 KSI)

• Tensile Strength: Minimum 415 MPa (60 KSI)

• Hardness: Typically ranges from 170-250 HB, decreasing after PWHT.

• Corrosion Resistance: Good resistance to oxidation due to chromium content.

• Weldability: Good weldability with proper heat treatment practices.

These properties make ASTM A335 P11 suitable for demanding applications in high-temperature environments.