ASTM A335 Alloy Steel Pipe

ASTM A335 (also known as ASME SA335) is a specification for seamless ferritic alloy-steel pipe for high-temperature service. This specification covers several grades of ferritic steel, each suitable for fusion welding, bending, flanging (vanstoning), and similar forming operations.

Key Features

High-Temperature Service: Designed to withstand high-temperature environments, making it ideal for power plants, refineries, petrochemical plants, and other industries requiring high-temperature and high-pressure service.
Seamless Construction: Ensures high strength and durability, suitable for critical applications.
Alloy Composition: Contains various alloying elements like chromium, molybdenum, and sometimes vanadium, which enhance its mechanical properties and resistance to heat and corrosion.

Common Grades

Each grade within the ASTM A335 specification has distinct chemical compositions and properties. Here are some of the most commonly used grades:

P1
P2
P5
P9
P11
P22
P91
P92

Chemical Composition

The exact chemical composition varies by grade, but generally, these alloys include:

Chromium (Cr): Enhances hardness, strength, and corrosion resistance.
Molybdenum (Mo): Increases strength at high temperatures.
Carbon (C): Provides hardness and strength.
Silicon (Si), Manganese (Mn), Phosphorus (P), Sulfur (S): Present in varying amounts to improve various properties.

Chemical Composition

The chemical composition of ASTM A335 pipes varies by grade. Here are the typical compositions for some common grades:

Element	P1	P2	P5	P9	P11	P22	P91	P92
Carbon (C)	0.10-0.20	0.05-0.15	0.15 max	0.15 max	0.05-0.15	0.05-0.15	0.08-0.12	0.07-0.13
Manganese (Mn)	0.30-0.80	0.30-0.61	0.30-0.60	0.30-0.60	0.30-0.60	0.30-0.60	0.30-0.60	0.30-0.60
Phosphorus (P)	0.025 max	0.025 max	0.025 max	0.025 max	0.025 max	0.025 max	0.020 max	0.020 max
Sulfur (S)	0.025 max	0.025 max	0.025 max	0.025 max	0.025 max	0.025 max	0.010 max	0.010 max
Silicon (Si)	0.50 max	0.50 max	0.50 max	0.25-1.00	0.50-1.00	0.50 max	0.20-0.50	0.50 max
Chromium (Cr)	0.50-0.80	0.50-0.81	4.00-6.00	4.00-6.00	1.00-1.50	1.90-2.60	8.00-9.50	8.50-9.50
Molybdenum (Mo)	0.44-0.65	0.44-0.65	0.45-0.65	0.90-1.10	0.44-0.65	0.85-1.05	0.85-1.05	0.30-0.60
Vanadium (V)	–	–	–	–	–	–	0.18-0.25	0.15-0.25
Nitrogen (N)	–	–	–	–	–	–	0.03-0.07	0.03-0.07

Mechanical Properties

These properties also vary by grade but typically include:

Tensile Strength: Minimum 415 MPa (60,000 psi)
Yield Strength: Minimum 205-275 MPa (30,000-40,000 psi), depending on the grade
Elongation: Varies by grade and specific dimensions

The mechanical properties of ASTM A335 pipes also vary by grade. Here are the typical mechanical properties for some common grades:

Property	P1	P2	P5	P9	P11	P22	P91	P92
Tensile Strength, min (MPa)	380 (55,000)	415 (60,000)	415 (60,000)	415 (60,000)	415 (60,000)	415 (60,000)	585 (85,000)	620 (90,000)
Yield Strength, min (MPa)	205 (30,000)	205 (30,000)	205 (30,000)	205 (30,000)	205 (30

Applications

ASTM A335 pipes are commonly used in:

Power Generation:
- Superheater and reheater tubes
- Steam lines
Petrochemical and Refinery:
- Process piping
- Heat exchangers
Industrial Boilers:
- Boiler tubes
- High-pressure steam boilers
Oil and Gas:
- Transmission of fluids and gases under high pressure and temperature

Manufacturing Process

The manufacturing process of ASTM A335 pipes involves:

Seamless Construction: Ensures no welded seams, which enhances the pipe’s ability to withstand high pressure and temperature.
Heat Treatment: Normalizing, tempering, or other heat treatments to achieve the desired mechanical properties.
Testing: Includes various mechanical and chemical tests to ensure compliance with the standards, such as tensile tests, hardness tests, and hydrostatic tests.

Standards and Specifications

ASTM A335/A335M: Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service.
ASME SA335: Equivalent ASME standard.

Summary

ASTM A335 Alloy Steel Pipe is a critical material for high-temperature and high-pressure applications across various industries, particularly in power generation and petrochemicals. Its seamless construction and alloy composition provide excellent strength, durability, and resistance to heat and corrosion.

Seamless steel pipe

Carbon steel seamless pipe is used in a range of applications in all different industries, including petrochemical, environmental, energy, and more. Thanks to more than 100 years of combined experience and vast knowledge across multiple industries, we can help match you with the right product for your unique application. Our friendly, knowledgeable customer service representatives will listen to your needs and can offer suggestions to get you products that meet your requirements.

Seamless Pipes

Product Name: seamless pipe, seamless steel pipe, seamless carbon steel pipe, carbon seamless steel pipe,Seamless Line pipe Application: For converying gas, water & oil for Fluids Transmission Size: OD: 10.3-1219.2mm WT: 1.65-60mm LENGTH: 5.8/6/11.8/12m

Structural Seamless Steel Pipe

Structural seamless steel pipes are critical components in numerous industries due to their strength, durability, and versatility. These pipes are manufactured without seams, providing a uniform structure that can withstand high pressure and mechanical stress. This makes them suitable for mechanical and pressure applications and ordinary uses in steam, water, gas, and air lines. They are also ideal for welding and forming operations involving coiling, bending, and flanging, subject to certain qualifications.

Boiler Steel Pipes

Boiler Steel Pipes are critical components in many industrial applications, providing reliable performance under extreme conditions. By adhering to strict quality standards and understanding the key properties and classifications of these tubes, industries can ensure the safe and efficient operation of their thermal systems.

Seamless Steel Fluid Pipe

Seamless steel fluid pipes are vital components in many industrial systems, offering unmatched strength, durability, and reliability. By understanding their characteristics, manufacturing processes, materials, standards, and applications, industries can select the appropriate seamless pipes to ensure efficient and safe fluid transport.

Mechanical Steel Tubes

Mechanical steel tubes are essential for a variety of industrial applications requiring high strength, precision, and durability. The choice of material—whether carbon steel, alloy steel, or stainless steel—depends on the specific requirements of the application, such as mechanical properties, corrosion resistance, and ease of machining.