What ASTM A106 Grade B Carbon Steel Pipe?
ASTM A106 Grade B Carbon Steel Pipe is a type of seamless carbon steel pipe, specially designed for high-temperature applications. Unlike welded pipes, the seamless structure eliminates the potential weak point of welds, and is particularly suitable for the transportation systems of high-pressure steam, superheated water, and flammable and explosive media.
This standard includes three grades: Grade A, Grade B and Grade C. Based on our supply experience, Grade B, with its balanced strength, excellent weldability and optimal cost-performance ratio, has occupied over 90% of the global A106 pipeline orders.
Typical characteristics of Grade B:
- Carbon content ≤ 0.30% -- Ensures weldability
- Manganese content: 0.29–1.06% -- Provides sufficient strength
- Seamless manufacturing - No risk of longitudinal weld defects
- Maximum service temperature: ~425°C -- Suitable for the majority of industrial high-temperature pipelines
Based on customer feedback, users who choose Grade B typically require stable and reliable high-temperature performance rather than extreme strength - this makes it an ideal choice for process pipelines in oil refineries, power stations and chemical plants.
Jiangsu Cunrui Metal Products Co., Ltd. supplies Grade B seamless carbon steel pipes that fully comply with the ASTM A106/ASME SA106 specifications. The pipes are available in a wide range of specifications and come with a complete warranty certificate (MTC) and traceable furnace number records. Whether you are building new process pipelines, replacing old steam pipes, or exporting overseas projects, our A106 Grade B can provide reliable high-temperature strength and long-term service stability.
Do you need a quotation or a sample of the warranty certificate? Contact us for fast certification and supply.
Core advantages of the product
Designed specifically for high-temperature conditions, with a maximum service temperature of up to 425°C.
Unlike low-pressure fluid pipes such as ASTM A53, the allowable stress of ASTM A106 Grade B Carbon Steel Pipe is explicitly recognized by the ASME B31.3 specification under high temperatures. At 400°C, its allowable stress can still remain at approximately 96 MPa, while ordinary carbon steel pipes have already experienced significant strength degradation at this temperature.
Seamless structure, no risk of weld defect
The A106 standard only covers seamless steel pipes, fundamentally eliminating potential manufacturing defects such as incomplete fusion, slag inclusion, and cracks in the longitudinal welds. For high-pressure steam and flammable/explosive media, this characteristic directly translates into higher safety redundancy.
Chemical Composition & Mechanical Properties
The following are the chemical composition requirements and typical values for ASTM A106 Grade B Carbon Steel Pipe (based on the ASTM A106 specification and our company's measured data):
| Element | ASTM Requirement (%) | Typical Value (%) |
|---|---|---|
| Carbon (C) | 0.25 max | 0.17 |
| Silicon (Si) | 0.10 min | 0.26 |
| Manganese (Mn) | 0.29 – 1.65 | 1.52 |
| Phosphorus (P) | 0.035 max | 0.016 |
| Sulfur (S) | 0.035 max | 0.008 |
| Chromium (Cr) | 0.40 max | 0.006 |
| Nickel (Ni) | 0.40 max | 0.012 |
| Copper (Cu) | 0.40 max | 0.007 |
| Molybdenum (Mo) | 0.15 max | 0.001 |
| Vanadium (V) | 0.08 max | 0.02 |
Additional Note: According to the ASTM A106 standard, when the carbon content is below the maximum limit, the manganese content can be increased proportionally by 0.06% for every 0.01% reduction in carbon content, up to a maximum of 1.35%. The total content of the five elements (Cr, Cu, Mo, Ni, V) shall not exceed 1%. CE≤0.45
Mechanical Properties
| Property | ASTM Requirement | Typical Value |
|---|---|---|
| Tensile Strength (min) | 415 MPa | 535 MPa |
| Yield Strength (min) | 240 MPa | 355 MPa |
| Elongation (min, longitudinal) | 30% | 38% |
Typical values explanation: The above typical values are based on the measured data of our company's batch-produced products. The actual values may vary slightly due to pipe diameter, wall thickness and heat treatment conditions.
Why choose Jinjiang Cunrui?
At Jiangsu Cunrui Metal Products Co., Ltd., we have been supplying ASTM A106 Grade B Carbon Steel Pipes to domestic and international engineering projects for over 15 years. Our focus is not merely on delivering pipes that meet specifications - but also on helping our customers precisely match the specifications, conditions, and surface treatments with the actual working conditions.
From our experience, the long-term service performance depends on three factors:
- Select the appropriate grade based on temperature and medium.
- Ensure batch consistency through traceable smelting furnace numbers
- Provide complete documentation covering the entire process from factory production to installation.
We work closely with engineers and the procurement team to ensure that the pipes you receive are not only "compliant", but also have been verified in practice - whether it's the creep resistance in high-temperature steam pipelines, or the low-temperature toughness in extremely cold environments.
| Parameter | Details |
|---|---|
| Standard | ASTM A106 / ASME SA106 |
| Grade | B |
| Manufacturing | Seamless (hot-finished or cold-drawn) |
| Size Range | NPS 1/8″ – NPS 48″ (DN6 – DN1200) |
| Wall Thickness | Schedule 10 – Schedule XXS |
| Length | 6 m random length, fixed length on request |
| Delivery Condition | As-rolled, normalized, or stress-relieved |
| End Finish | Plain ends, beveled ends, threaded & coupled |
| Surface Finish | Black (as-rolled), varnished, or galvanized |
Additional Services:
- Groove processing
- Sandblasting / Painting
- Third-party inspection (SGS/BV/TÜV) is optional.
- EN 10204 Type 3.1 Warranty Certificate (Standard Configuration)
In which situations must P9 steel pipes be considered?
Jiangsu Cunrui Metal Products Co., Ltd. has been supplying ASTM A106 Grade B Carbon Steel Pipes to the following industries:
- Refinery: Process pipelines, high-temperature hot oil pipelines, steam tracing system
- Chemical plant: High-temperature reactor connection pipes, heat exchanger shells
- Thermal power station: Water supply pipelines within the boiler area, main steam pipes (temperature ≤ 425°C area)
- Industrial boilers: Superheater header and connecting pipes of medium and low pressure boilers
- Natural gas transportation: Station process pipelines and high-pressure natural gas trunk lines
In the aforementioned application, the primary demands of the customers are typically the long-term stability at high temperatures and the operability of the weld seams, rather than the short-term extreme strength - this is precisely the positioning of A106 Grade B.
Frequently Asked Questions
Q: What is the maximum service temperature for ASTM A106 Grade B?
A:Approximately 425°C (800°F). Above this temperature, creep strength declines sharply, and chrome-moly alloy steel like ASTM A335 P11 or P22 is recommended.
Q: ASTM A106 Grade B pipe seamless or welded?
A: Seamless only. ASTM A106 covers hot-finished and cold-drawn seamless carbon steel pipes.
Q: What is the difference between A106 Grade B and A53 Grade B?
A: A106 Grade B is designed for high-temperature service in plants (refineries, power stations) and is seamless only. A53 Grade B can be welded or seamless and is intended for mechanical and low-pressure fluid service.
Note: ASTM A106 Grade B is not suitable for all applications - however, in environments where both high temperature and pressure exist, it offers a proven and reliable solution that has been verified over several decades.
If your project involves high-temperature steam, hot oil or high-pressure process pipelines, choosing the correct material grade at the early stage of the project can significantly enhance the economic efficiency and safety during long-term operation. In these cases, ASTM A106 Grade B Carbon Steel Pipe is often a practical and reliable choice.
Do you need a quotation or technical data sheet? Please provide your specifications (outer diameter × wall thickness), length, quantity and project conditions. Our engineering and export team will reply with the price, delivery date and certification documents within 24 hours.
