Welcome to ALLLAND Steel Pipe Co., Ltd.
Welcome to ALLLAND Steel Pipe Co., Ltd.
ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing. We specialize in the production, R&D, and supply of seamless and welded steel pipes. Our boiler steel pipe are manufactured from premium steel billets through hot rolling, cold drawing/cold rolling, and standardized heat treatment processes. Available in a comprehensive range of dimensions, our products meet diverse application requirements. All products undergo rigorous testing before shipment, including chemical composition analysis, mechanical property testing, hydrostatic pressure testing, non-destructive testing (UT/ET), and dimensional/visual inspection. This ensures every pipe meets the safety requirements for boiler system applications.
Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience.
The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines.
With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!
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ASTM A106 Grade A is a seamless carbon steel tube designed for high-temperature applications in non-critical pressure systems. It belongs to the ASTM A106 series, which includes Grade A, Grade B, and Grade C.
Among these grades, Grade A has the lowest tensile strength, making it a more economical choice for projects that do not require extremely high pressure resistance.
O.D.:
1/2” to 36” (21.3 mm – 914.4 mm)
W.T.:
SCH 10 to SCH 160 / XXS
Length:
Type:
Seamless Carbon Steel Pipe
Standards:
ASTM A106 / ASME SA106
Grades:
Grade A
Tube Ends& Surface Treatment:
Square, Chamfered; Black Skin, Pickled, Painted/Oiled for Rust Prevention
Delivery Conditions:
Grade, Specification, Furnace Number, Standard
ASTM A106 Grade A pipes are available in a variety of sizes to meet different engineering needs.
Size Range:
Outer Diameter (OD): 21.3 mm – 914.4 mm
Wall Thickness (WT): SCH 10 – SCH 160 / XXS
Available Schedules:
SCH 10 / 20 / 40 / 80 / 120 / 160 / XXS
Wall thickness directly determines pressure resistance and is a key factor in pipeline design and selection.
| Schedule | Wall Thickness | Pressure Level |
| SCH 40 | Standard | Medium |
| SCH 80 | Thick | Higher |
| SCH 160 | Very thick | High |
Chemical Composition (Typical):
Carbon (C): ≤ 0.25%
Manganese (Mn): 0.27 – 0.93%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Mechanical Properties:
Tensile Strength: ≥ 330 MPa (48,000 psi)
Yield Strength: ≥ 205 MPa (30,000 psi)
Elongation: ≥ 20%
ASTM A106 Grade A steel provides balanced mechanical properties for general industrial piping systems and has stable weldability.
ASTM A106 Grade A seamless steel pipe is produced by hot rolling or cold drawing seamless processes.
ASTM A106 Grade A is used in high-temperature and low-to-medium pressure piping systems where strength is not the primary design requirement.
Typical applications include:
It is not recommended to use it in high-pressure, long-distance oil and gas transmission pipelines.
| Item | Grade A | Grade B |
| Carbon Content | ≤ 0.25% | ≤ 0.30% |
| Tensile Strength | ≥ 330 MPa | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa | ≥ 240 MPa |
| Strength Level | Lower | Higher |
| Weldability | Better | Good |
| Typical Use | Low / medium stress | Industrial standard piping |
ASTM A106 Grade A can only be considered a substitute for Grade B if explicitly approved in the engineering design. In most industrial piping projects, the two are not directly interchangeable due to differences in strength and pressure ratings.
The key issue is not whether substitution is possible, but whether the system design allows the use of a lower strength grade without compromising safety margins.
Choosing the wrong pipe grade in a piping system (especially the confusion between ASTM A106 Grade A and Grade B) poses safety risks primarily due to cost-driven decisions, applicability issues, and inappropriate material substitutions.
| Item | Grade A | Grade B |
| Strength level | Lower | Higher |
| Thermal stability | Limited | Better |
| Suitable for boiler main lines | No | Yes |
In boiler systems where both pressure and thermal stress exist simultaneously, Grade B steel is typically preferred for main steam pipes and pressurized pipes, while Grade A steel is limited to auxiliary pipes or low-stress areas.
The real safety risk is not simply material difference, but misalignment between design specification and material selection:
| Item | ASTM A106 Grade A | ASTM A53 | API 5L |
| Main Purpose | High-temperature service | General piping | Oil & gas transmission |
| Pipe Type | Seamless | Seamless / Welded | Seamless / Welded |
| Carbon Content | ≤ 0.25% | ≤ 0.30% | Grade dependent |
| Strength Level | Low–Medium | Medium | Medium–High |
| Temperature Resistance | Excellent | Moderate | Moderate |
| Pressure Rating | Medium | Medium | High |
| Typical Application | Boilers, process piping | Water, air, structural use | Oil & gas pipelines |
ASTM A106 Grade A pipes are supplied with stable quality and reliable export performance.
Only under approved engineering conditions.
Typically up to ~425°C depending on application design.
ASTM A106 Grade A is seamless only.
It is manufactured as a seamless carbon steel pipe, meaning it has no weld seam along the pipe body, and is produced by hot-finished or cold-drawn seamless processes for high-temperature and pressure service applications.
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