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Hemaokang Steel (Shandong) Co., Ltd. is proud to offer the ASTM A106 Gr.B Seamless Carbon Steel Pipe Sch 80 4 Inch with a precise 0.5% carbon content. As a reliable manufacturer based in Liaocheng, Shandong, China, we have established a strong reputation in the global steel market since 2025, with an annual export value exceeding US$50 million and a dedicated team of 51–100 professionals. Our pipes are produced under strict ISO9001 quality management systems, ensuring consistent performance and durability for demanding applications. This product is designed to meet the rigorous requirements of high-pressure and high-temperature environments, making it a preferred choice for industries worldwide.
Our seamless carbon steel pipe is manufactured using advanced hot-rolled or cold-drawn processes, resulting in a uniform structure and excellent mechanical properties. The ASTM A106 Gr.B grade ensures a minimum yield strength of 240 MPa and tensile strength of 415 MPa, while the 0.5% carbon content provides enhanced hardness and wear resistance. The Schedule 80 wall thickness (approximately 0.674 inches for 4-inch pipe) offers superior pressure-bearing capacity compared to standard schedules, suitable for critical applications in oil and gas transmission, petrochemical plants, power generation, and boiler systems. Each pipe undergoes rigorous inspection, including hydrostatic testing, eddy current testing, and dimensional checks, to guarantee compliance with ASTM standards.
Key Features & Technical Specifications
- Material Grade: ASTM A106 Gr.B (Carbon Steel)
- Diameter: 4 Inch (Nominal Diameter 4", OD 114.3 mm)
- Wall Thickness: Schedule 80 (SCH 80, approx. 0.674" / 17.12 mm)
- Carbon Content: 0.5% (enhanced strength and hardness)
- Manufacturing Process: Seamless (Hot Finished or Cold Drawn)
- Surface Condition: Black, bare, oiled, or customized coating
- Standard Compliance: ASTM A106 / A106M
- Certification: ISO9001, mill test certificates available
| Parameter | Value |
| Tensile Strength (min) | 415 MPa (60,200 psi) |
| Yield Strength (min) | 240 MPa (34,800 psi) |
| Elongation (min) | 30% |
| Chemical Composition – Carbon | 0.5% (max 0.5%) |
| Chemical Composition – Manganese | 0.29% – 1.06% |
| Chemical Composition – Phosphorus | ≤ 0.035% |
| Chemical Composition – Sulfur | ≤ 0.035% |
| Hydrostatic Test Pressure | As per ASTM A106 (min 2,500 psi) |
The 0.5% carbon content in this pipe offers a distinct advantage in applications requiring higher strength and wear resistance, such as high-pressure steam lines, refinery piping, and offshore platforms. The seamless construction eliminates weak points associated with welded seams, providing improved reliability under cyclic loading and thermal stress. Additionally, the Schedule 80 wall thickness allows for higher operating pressures and a longer service life in corrosive environments when properly treated.
Our pipes are shipped from Qingdao Port, with flexible packaging options including bare pipes, bundling, or wooden crates for sea freight. We serve a diverse global market spanning North America, South America, Europe, Asia, Africa, and Oceania, ensuring timely delivery and competitive pricing. Each order comes with a mill test certificate (MTC) traceable to the heat number, providing full transparency on chemical and mechanical properties.
Why Choose Hemaokang Steel?
As a newly established company with a strong foundation, we have rapidly grown to achieve an annual export value of US$50–100 million, reflecting our commitment to quality and customer satisfaction. Our team of 51–100 experienced staff ensures that every production stage—from raw material sourcing to final inspection—meets the highest standards. With ISO9001 certification, we guarantee consistent quality control and traceability. Moreover, our strategic location in Liaocheng, a major steel hub in China, allows us to access premium raw materials and efficient logistics.
We understand that purchasing industrial pipes requires trust and reliability. That is why we offer customized solutions, including cutting, threading, beveling, and coating services, to meet your specific project requirements. Whether you need a small batch for maintenance or a large volume for a new construction project, we have the capacity to fulfill your orders with short lead times.
Frequently Asked Questions (FAQ)
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Q: What is the difference between ASTM A106 Gr.B and API 5L Gr.B?
A: ASTM A106 Gr.B is specifically designed for high-temperature service, while API 5L Gr.B is for line pipe in oil and gas transmission. Our A106 Gr.B pipe is tested for elevated temperature performance and is suitable for refineries, boilers, and power plants. -
Q: Does the 0.5% carbon content affect weldability?
A: Yes, higher carbon content reduces weldability. However, with proper preheating and post-weld heat treatment (PWHT), our pipe can be welded successfully. We recommend using low-hydrogen welding procedures and consulting our technical team for specific guidelines. -
Q: What is the standard length of the pipe?
A: Standard lengths are 20 ft (6 m) or 40 ft (12 m), or random lengths as per your requirements. Custom lengths can be cut to order. -
Q: Is this pipe suitable for sour service (H2S environment)?
A: ASTM A106 Gr.B is not typically recommended for sour service due to the carbon content and lack of sulfide stress cracking resistance. For H2S environments, consider ASTM A333 Gr.6 or other NACE-compliant grades. -
Q: What surface treatments are available?
A: Standard options include black (mill varnish), bare (no coating), oiled, or galvanized. We also offer custom coatings like FBE (fusion-bonded epoxy) or 3LPE upon request. -
Q: Do you provide third-party inspection?
A: Yes, we can arrange third-party inspection by SGS, BV, or other accredited agencies at the buyer's cost. Our mill test certificates are available for each heat. -
Q: What is the minimum order quantity (MOQ)?
A: MOQ is typically 1 ton, but we can accommodate smaller quantities for trial orders. Please contact our sales team for details. -
Q: How do you ensure the pipe meets the 0.5% carbon specification?
A: Each heat is analyzed using spectroscopy during production, and the carbon content is controlled within ±0.05% of the target. The certified mill test report confirms the exact composition.
Contact us today for a quote or more information. With our competitive pricing, reliable quality, and global shipping capabilities, Hemaokang Steel is your trusted partner for ASTM A106 Gr.B seamless carbon steel pipes. Let us help you build a stronger foundation for your projects.
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