ALLLAND Boiler Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Factory. Our Circular Hollow Sections are widely used in building structures, bridge engineering, steel structure workshops, machinery manufacturing, and energy engineering. Our production standards include: EN 10210, EN 10219, ASTM A500, ASTM A53, and GOST standards, meeting requirements across different countries and environments. Circular Hollow Sections (CHS) feature uniform stress distribution in all directions, high compressive strength, excellent torsional resistance, and an aesthetically pleasing appearance, making them ideal for factory projects requiring exceptional stability. ALLLAND maintains a robust quality control system and offers production lines for galvanized coatings and other surface treatments. We welcome your inquiries.
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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Circular Hollow Section, commonly abbreviated as CHS in the steel pipe industry, is a type of hollow structural steel. Its production processes and standards vary widely, encompassing both welded and seamless pipes. These sections are widely used in structural construction, machinery manufacturing, and bridge engineering. Key features include uniform stress distribution, excellent structural stability, ease of construction, and an aesthetically pleasing appearance. ALLLAND’s Circular Hollow Sections offer diverse specifications, superior compressive strength, and high load-bearing capacity. Inquiries are welcome.
O.D.:
21.3 mm – 508 mm (Common seamless process dimensions)
W.T.:
2 mm – 25 mm (Thicker wall thicknesses available upon request)
Length:
6 m – 12 m (Cut to length) or cut to customer specifications
Process:
Hot-rolled seamless / Cold-drawn seamless; welded pipes
Standards:
EN 10210 / EN 10219, ASTM A500, DIN 2391, etc.
Steel Grades:
S235, S275, S355, Q235, Q355, St37, St52, ASTM A500 Gr.B/C, 09G2S
Surface Treatment:
Hot-dip galvanized / Epoxy coating / Three-layer PE corrosion protection
Tube Ends :
Cutting, chamfering, welding, and prefabrication
| NPS (inch) | OD (mm) | WT (mm) | Weight(kg/m) |
| 1/2″ | 21.3 | 2 | 1.34 |
| 3/4″ | 26.7 | 2.6 | 2.04 |
| 1″ | 33.7 | 3.2 | 3.18 |
| 1 1/4″ | 42.4 | 3.6 | 4.57 |
| 1 1/2″ | 48.3 | 4 | 5.7 |
| 2″ | 60.3 | 5 | 8.9 |
| 2 1/2″ | 73 | 6.3 | 13.5 |
| 3″ | 88.9 | 7.1 | 18.6 |
| 4″ | 114.3 | 8 | 27.3 |
| 6″ | 168.3 | 10 | 56.5 |
| 8″ | 219.1 | 12.7 | 93 |
| 10″ | 273 | 16 | 153 |
| 12″ | 323.9 | 20 | 232 |
| 14″ | 355.6 | 25 | 327 |
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| S235 | 235 | 360 – 510 | ≥ 26 |
| S275 | 275 | 410 – 560 | ≥ 25 |
| S355 | 355 | 470 – 630 | ≥ 22 |
| 09G2S | 290 | 430 – 580 | ≥ 23 |
Seamless Tubes
Hot-Rolled: Produced by piercing steel billets, suitable for large-diameter, thick-walled pipes. Offers excellent pressure resistance and high strength for high-pressure environments.
Cold-Drawn: Further processed from hot-rolled tubes, achieving greater dimensional precision and smoother surfaces. Ideal for small-diameter pipes.
Welded Tubes
ERW (Electric Resistance Welded): Suitable for small-diameter pipes. Features high weld seam strength, uniform wall thickness, and rapid production.
LSAW: For large-diameter or ultra-large-diameter pipelines, suitable for pressure pipelines and large-scale load-bearing structures.
Surfaces can undergo hot-dip galvanizing, epoxy coating, 3PE, or PP coating. This ensures stable operation in general environments and extended service life in highly corrosive underground conditions.
Typical three-layer PE/PP coating structure thickness:
By Steel Grade and Load Capacity
Small supports or light loads: S235 / Q235
Medium-load structures or bridges: S275 / Q355
High-strength pressure or cryogenic pipelines: S355 / 09G2S
By Wall Thickness
Thin-walled (WT ≤5 mm): Lightweight structures, decorative applications, mechanical supports
Thick-walled (WT ≥8 mm): Pressure vessels, bridges, industrial pipelines, long-span structures
Common steel grades for Circular Hollow Sections include: European standards S235, S275, S355; American standard ASTM A500 Gr.B / Gr.C; Chinese and Russian standards Q235, Q355, 09G2S. These steels exhibit yield strengths ranging from 235–355 MPa and tensile strengths approximately 360–630 MPa, meeting structural engineering requirements.
CHS is the abbreviation for Circular Hollow Section. RHS stands for Rectangular Hollow Section, and SHS stands for Square Hollow Section.
Yes, Circular Hollow Sections are widely used in outdoor environments. Surface treatment is generally required to provide corrosion resistance and extend service life. Options include hot-dip galvanizing, epoxy coating, and 3PE coating.
