Products Features
Good high-temperature strength (core advantage)
The core advantage of ASTM A106 lies in its excellent high-temperature strength. Grade B maintains approximately 300 MPa tensile strength under 427°C conditions, with a performance retention rate of about 72%, effectively resisting slow plastic deformation (creep) of materials under high temperature and pressure, ensuring the safety and reliability of pipelines during long-term high-temperature service.
Excellent welding performance
The carbon equivalent design of ASTM A106 ensures good weldability. The welding process is well-established, with moderate difficulty for welders, making it suitable for large-scale on-site installation. When welding thick-walled pipes or in low-temperature environments, preheating to 100-150°C is recommended.
Good machinability
It can undergo various forming processes such as hot bending, cold bending, and forging, making it suitable for manufacturing pipe fittings like elbows, tees, and reducers. It can also be machined using conventional mechanical machining methods.
Mature technology and long-term reliability
It exhibits good microstructural stability during long-term service at temperatures ≤427°C. Delivered in normalized or hot-rolled condition, it achieves a uniform and fine microstructure, ensuring microstructural stability and reliability under high-temperature service conditions.
Technical Specifications
Chemical Composition(ASTM A106 / ASME SA106)
|
Element |
Grade A |
Grade B |
Grade C |
Note |
|
C |
≤ 0.25% |
≤ 0.30% |
≤ 0.35% |
Guarantee strength and weldability |
|
Mn |
0.27 - 0.93% |
0.29 - 1.06% |
0.29 - 1.06% |
Solid solution strengthening, improve strength |
|
P |
≤ 0.035% |
≤ 0.035% |
≤ 0.035% |
Harmful elements, strictly controlled |
|
S |
≤ 0.035% |
≤ 0.035% |
≤ 0.035% |
Harmful elements, strictly controlled |
|
Si |
≥ 0.10% |
≥ 0.10% |
≥ 0.10% |
Deoxidizer, improve high-temperature oxidation resistance |
|
Cr |
≤ 0.40% |
≤ 0.40% |
≤ 0.40% |
Residual elements, strictly controlled |
|
Cu |
≤ 0.40% |
≤ 0.40% |
≤ 0.40% |
Residual elements, strictly controlled |
|
Mo |
≤ 0.15% |
≤ 0.15% |
≤ 0.15% |
Residual elements, strictly controlled |
|
Ni |
≤ 0.40% |
≤ 0.40% |
≤ 0.40% |
Residual elements, strictly controlled |
|
V |
≤ 0.08% |
≤ 0.08% |
≤ 0.08% |
Residual elements, strictly controlled |
|
Fe |
Remaining quantity |
Remaining quantity |
Remaining quantity |
Matrix element |
Physical Properties
|
Performance |
Numerical Value/Range |
Test conditions |
|
Density |
≈ 7.85 g/cm³ |
Room temperature (20°C) |
|
Melting Point |
≈ 1420-1460°C |
- |
|
Elastic modulus |
≈ 200 GPa |
Room temperature |
|
Thermal Conductivity |
≈ 50 W/(m·K) |
Room temperature |
|
Coefficient of thermal expansion (20-100°C) |
≈ 11.7 × 10⁻⁶ /K |
- |
|
Poisson's ratio |
≈ 0.28 |
Room temperature |
|
Magnetism |
Ferromagnetic |
Carbon steel, which is magnetic |
Mechanical Properties (Typical Value, ASTM A106)
|
Performance |
Grade A |
Grade B |
Grade C |
Implementation standards |
|
Tensile Strength |
≥ 330 MPa |
≥ 415 MPa |
≥ 485 MPa |
ASTM A106 |
|
Yield strength |
≥ 205 MPa |
≥ 240 MPa |
≥ 275 MPa |
ASTM A106 |
|
Elongation |
≥ 35% |
≥ 30% |
≥ 30% |
ASTM A106 |
|
Hardness |
≤ 137 HB |
≤ 159 HB |
≤ 179 HB |
- |
Note: Grade B is the most widely used grade in the ASTM A106 standard, offering an excellent balance between strength, weldability, and cost. It is suitable for long-term high-temperature service conditions up to approximately 427°C.
High-temperature performance (Typical value for Grade B)
|
Temperature |
Tensile strength (MPa, approximately) |
Performance retention rate |
Description |
|
Room Temperature (20°C) |
≥ 415 |
100% |
Benchmark |
|
200°C |
≈ 380 |
≥ 92% |
The strength is well maintained |
|
300°C |
≈ 360 |
≥ 87% |
Still maintaining a high strength |
|
400°C |
≈ 330 |
≥ 80% |
Suitable for high-temperature conditions |
|
427°C |
≈ 300 |
≥ 72% |
It is recommended to use the upper limit for a long period |
|
500°C |
≈ 250 |
≥ 60% |
Strength significantly decreased |
Long-term thermal stability:
The microstructure remains stable during long-term service at temperatures ≤427°C. When used long-term above 450°C, the creep strength decreases significantly, and long-term service above 450°C is not recommended.
Heat treatment system
The final performance of ASTM A106 is highly dependent on the heat treatment regime:
Normalizing
Heat to 850-950°C, hold for sufficient time, then air cool. This results in a uniform and fine-grained microstructure, improving mechanical properties.
Full Annealing (Optional)
Heat to 850-900°C, hold, then furnace cool to approximately 650°C, followed by air cooling to room temperature. It is used to relieve cold working stresses or improve cold working formability.
Post-Weld Heat Treatment (PWHT, selected based on wall thickness and service conditions)
Heat to 600-650°C, hold, and then slow cool to relieve residual welding stresses.
Applicable Media
High-temperature steam
Main steam pipelines of power plants (≤427°C), boiler superheater tubes, reheater tubes
Petroleum Refining Medium
High-Temperature Process Piping Such as Atmospheric and Vacuum Distillation, Catalytic Cracking, etc.
High-pressure process gas
High-temperature and high-pressure pipelines for chemical equipment such as ammonia synthesis, methanol, and chemical fertilizers
Hot water
Heating network, heating system
Heat transfer oil and thermal carriers
Pipelines for chemical heat transfer systems
Note: ASTM A106 is not applicable to strongly corrosive media such as strong oxidizing acids and high-temperature, high-concentration chlorides. Its upper oxidation temperature limit is approximately 427°C. For temperatures exceeding this, chromium-molybdenum alloy steels such as ASTM A335 P11/P22 are recommended.
ASTM A106 is suitable for high-temperature and high-pressure conditions ranging from 350 to 427°C, and is recommended for use in the following areas:
Application Fields
-
Fossil Fuel Power Generation (Core Application)
● Main steam pipe of power plant (≤427°C)
● Boiler superheater tube, reheater tube
● High-temperature steam pipe, feedwater pipe
● Boiler header, superheater header -
Petrochemical Engineering (Core Applications)
● High-temperature pipelines of the atmospheric and vacuum distillation unit in a refinery
● Catalytic Cracking Unit Process Piping
● High-temperature and high-pressure pipelines in hydrotreating units
● Delayed Coking Unit Process Piping -
Chemical and Fertilizer Industry
● High-Temperature Process Piping for Ammonia Synthesis Plants
● Methanol Plant Reformate Gas Pipelines
● High-Temperature and High-Pressure Piping in Fertilizer Factories -
Combined Heat and Power and Central Heating
● High-temperature steam pipeline network of a thermal power plant
● Urban centralized heating high-temperature hot water pipeline -
High-temperature and high-pressure pipe fittings
● High-temperature elbows, tees, and reducers
● Forged pipe fittings, flanges
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive ASTM A106 seamless steel pipes that perfectly match your project requirements.
Customizable material forms
We support producing various basic and special shapes according to drawings or specifications.
|
Form |
 Hot-rolled seamless steel pipe
|
 Cold-drawn seamless steel pipe
|
 Large-diameter thick-walled pipe
|
|---|---|---|---|
|
Conventional Range |
Diameter: 60.3 - 1067 mm; Wall Thickness: 3 - 150 mm |
Outer Diameter: 10.3 - 114.3 mm; Wall Thickness: 1 - 15 mm |
Outer Diameter: 219 - 1067 mm; Wall Thickness: 20 - 150 mm |
|
Customization Capability |
Fixed-length cutting, bevel processing, pipe end threads, normalized/ annealed condition |
Precision Dimension Control, Bright Annealing, Fixed-Length Cutting |
Hot expansion of tubes, fixed-length cutting, bevel machining |
Why Choose Us? - Reliable Engineering Technology. Dependable Delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of ASTM A106 Grade B?
Q: What are the differences between ASTM A106 Grades A, B, and C? How to choose?
Q: What is the maximum service temperature for ASTM A106 Grade B?
Q: What is the difference between ASTM A106 Grade B and API 5L Gr.B? How to choose between them?
Q: What is the welding performance of ASTM A106 Grade B?
Q: What is the corrosion resistance of ASTM A106 Grade B?
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