ASTM A106 Grade A is the standard base-grade seamless carbon steel pipe for general high-temperature service per ASTM A106 specifications. It features exceptional ductility, consistent thermal stability and stable chemical properties, offering outstanding formability and adaptability for medium to high-temperature industrial operating conditions. Thanks to its balanced performance and cost advantages, it is the most widely specified grade for conventional industrial piping with steady and standardized working parameters.
Manufactured with a 100% seamless weld-free structure, ASTM A106 Grade A completely avoids weld defects and structural stress concentration. It delivers stable and reliable performance for transporting hot and cold gaseous and liquid media, serving long-term continuous operation in power plants, general boiler systems and conventional petrochemical facilities. It remains the preferred cost-effective solution for routine high-temperature piping projects that require dependable performance.
Product Specifications
We supply a full size range of ASTM A106 Grade A seamless carbon steel pipes with abundant in-stock inventory and complete certification documents. Custom dimensions and professional precision processing are available to match various conventional high-temperature industrial project requirements.
| Item |
Specification Details |
| Steel Grade |
ASTM A106 Grade A |
| Executive Standard |
ASTM A106 / A106M Standard |
| Pipe Type |
Seamless Carbon Steel Pipe (Weld-Free Structure) |
| Outer Diameter |
1/8" – 24", support custom outer diameter |
| Wall Thickness |
SCH20 / SCH40 / SCH80 / SCH160, customizable thickness as required |
| Core Advantage |
Excellent ductility, superior thermal stability, good formability, high cost performance |
| Applicable Scenario |
Medium & high-temperature conventional industrial piping, general boiler and power plant systems |
| Surface Condition |
Smooth inner & outer surface, uniform wall thickness, no cracks or blemishes |
| MOQ |
1 Ton / Negotiable |
| Delivery Time |
3–7 days (stock); 15–30 days (custom) |
| Custom Service |
Custom size, cutting, threading, bending and precision processing |
| Certification |
MTC / EN 10204 3.1 / Third-party inspection available |
| Payment Terms |
T/T, L/C, Western Union, Trade Assurance |
Chemical Composition (Mass %)
ASTM A106 Grade A adopts a low-carbon optimized chemical formula with strictly controlled trace impurities. Its well-balanced element composition delivers superior ductility, excellent formability and stable thermal performance, ensuring reliable weldability and consistent mechanical stability for general high-temperature service applications.
| Element |
Content Requirement (%) |
| C (Carbon) |
Max 0.25 |
| Mn (Manganese) |
0.29 – 1.06 |
| P (Phosphorus) |
Max 0.035 |
| S (Sulfur) |
Max 0.035 |
| Si (Silicon) |
Min 0.10 |
| Cr (Chromium) |
Max 0.40 |
| Cu (Copper) |
Max 0.40 |
| Mo (Molybdenum) |
Max 0.15 |
| Ni (Nickel) |
Max 0.40 |
| V (Vanadium) |
Max 0.08 |
Mechanical Properties
ASTM A106 Grade A offers well-balanced mechanical properties with prominent ductility and flexibility. It provides excellent bending and forming capability and strong resistance to thermal deformation under medium and conventional high-temperature working environments, ensuring stable, safe and long-lasting operation for general industrial piping systems.
| Mechanical Index |
Standard Value |
| Minimum Yield Strength |
205 MPa (30,000 psi) |
| Tensile Strength |
415 – 550 MPa (60,000 psi Min) |
| Minimum Elongation (50mm Gauge Length) |
22% |
Standard Testing & Inspection Requirements
Every batch of ASTM A106 Grade A seamless pipes undergoes rigorous sampling tests and mandatory non-destructive examinations in full compliance with ASTM standard regulations. Comprehensive factory quality control ensures stable mechanical performance and operational safety under medium and high-temperature service conditions.
Batch Sampling Test Standard
| Test Item |
Pipe NPS Size |
Sampling Standard |
| Tensile Test |
NPS 5 and smaller |
1 piece per ≤400 pieces/lot |
| Tensile Test |
NPS 6 and larger |
1 piece per ≤200 pieces/lot |
| Bending Test |
NPS 2 and smaller |
1 piece per ≤400 pieces/lot |
| Flattening Test |
NPS 2 – 5 |
1 piece per ≤400 pieces/lot |
| Flattening Test |
NPS 6 and over |
1 piece per ≤200 pieces/lot |
Mandatory Hydrostatic Testing
Hydrostatic testing is a mandatory non-destructive test for all finished ASTM A106 Grade A pipes. This inspection verifies overall pressure tightness and structural stability to guarantee safe high-temperature service:
Test Stress Standard: The test pressure produces a pipe wall stress equal to 60% of room-temperature Specified Minimum Yield Strength (SMYS).
Maximum Test Pressure: NPS 3 and below: max 2500 psi; NPS larger than 3: max 2800 psi.
Pressure Holding Time: Minimum 5 seconds to ensure zero leakage and structural integrity.
Product Features & Advantages
As the foundational grade in the ASTM A106 seamless pipe series, ASTM A106 Grade A stands out for its excellent ductility and reliable thermal stability. Its low-carbon composition enables superior flexibility and formability, allowing easy cutting, bending and secondary fabrication. The weld-free seamless structure eliminates potential structural defects, delivering consistent performance in standard medium and high-temperature environments. With high cost-efficiency and stable quality, it is the most practical option for general industrial high-temperature piping projects.
Application Fields
Combining reliable thermal stability, outstanding ductility and qualified medium-temperature pressure resistance, ASTM A106 Grade A seamless pipes are widely adopted in standard high-temperature industrial piping systems across global industries.
| Application Field |
Typical Usage & Components |
| Power Generation Industry |
General power plant piping, medium-temperature steam transmission pipelines, conventional power auxiliary systems |
| Boiler Systems |
Industrial general boiler water delivery and medium-temperature circulation piping |
| Petrochemical Industry |
Conventional petrochemical factory process piping, medium-temperature gas and liquid transmission systems |
| General Industrial Piping |
Factory medium and high-temperature circulation pipelines, conventional thermal service piping systems |
We maintain full stock of premium ASTM A106 Grade A seamless carbon steel pipes with complete factory certifications and strict quality inspection records. Custom sizing and deep processing solutions are available to fit your exact project specifications. Feel free to contact us for professional technical support and competitive wholesale pricing!
