SMSTEEL
SMSTEEL
Structural design often hinges on balancing load capacity with spatial efficiency. 20mm square tubing (20x20mm SHS - Square Hollow Section) is the benchmark standard for lightweight structural frameworks, automated manufacturing lines, and architectural metal designs. Characterized by uniform geometric parameters, 20mm square tubing provides an exceptional strength-to-weight ratio compared to solid flat bars or round pipes.
Our structural 20mm steel profiles are engineered to precise dimensional tolerances, ensuring predictable wall thickness ranging from 0.8mm to 2.5mm depending on project demands. Whether utilized as hot-rolled structural tubing or cold-rolled galvanised fence posts, these tubes exhibit consistent mechanical characteristics that streamline automated cutting, welding, and fabrication steps.
How Chinese steel clusters leverage advanced technology, integrated raw materials, and massive supply chain ecosystems to deliver unparalleled value globally.
By establishing long-term, direct strategic partnerships with dominant domestic steel conglomerates like Hebei Iron and Steel Group, Baowu Iron and Steel Group, and Shougang Group, we bypass intermediaries. This guarantees stable chemical compositions and physical qualities from the source, minimizing raw material variability.
Our facility houses eight High-Frequency Induction Welded (HFIW) lines. Every production line integrates a five-stage system: strip preparation, roll forming, continuous high-frequency welding, weld bead removal, and online non-destructive eddy current testing.
We deploy advanced testing equipment sourced directly from Germany and Japan to monitor microstructure alignment, weld penetration depths, and surface roughness. Certified technicians ensure compliance with GB, ASTM, BS, DIN, and CE standards.
Comprehensive technical data for engineers, buyers, and project managers specifying structural square hollow sections.
| Dimension (mm) | Wall Thickness (mm) | Common Material Grades | Surface Treatment | Standard Compliance | Tensile Strength (MPa) |
|---|---|---|---|---|---|
| 20 x 20 | 0.8 - 1.2 | Q195, DX51D, SPCC | Pre-Galvanized (Z60-Z120), Bright Finish | GB/T 6728, ASTM A500 | 315 - 430 |
| 20 x 20 | 1.2 - 1.8 | Q215, Q235, S235JR | Hot Dip Galvanized, Black Annealed | EN 10219, BS 1387 | 370 - 500 |
| 20 x 20 | 2.0 - 2.5 | Q355, S355JR, ASTM A500 Gr. B | Oiled, Pickled (HRPO), Powder Coated | ASTM A500, DIN 2395 | 490 - 630 |
| 20 x 20 | 1.0 - 2.0 | SS304, SS316, SS201 | Hairline, 2B, BA, 8K Mirror Polish | ASTM A554 | 520 - 750 |
Where mechanical utility meets cost-effective material design. Discover the widespread applications of our 20mm profile tubing.
For modern agricultural setups, 20mm galvanized square hollow sections represent the ideal component for light canopy frames, greenhouse trusses, and internal hanging structures. The pre-galvanized zinc coating (ranging up to Z275) provides optimal corrosion barrier resistance against high-humidity, agricultural chemical vapors, and moisture cycling.
Utilized broadly for residential and industrial safety boundaries. Standard 20mm steel tubes serve as structural pickets, frame supports, and posts. Compatible with automated powder-coating processes, these profiles prevent structural sagging and resist weathering better than traditional wood or soft plastic composite alternatives.
From conveyor frames to rack assembly structures in global manufacturing hubs, the 20mm profile matches standard structural components perfectly. In automotive parts manufacturing, automated warehouse systems, and home appliance assembly operations, these profiles serve as versatile framing units.
Founded in 2010, STEP MILLION STEEL SUPPLY CHINA CO., LTD. has grown to become a leading steel material supplier and manufacturer in China. With a dedication to serving the public and focusing on quality, we supply a broad range of products: pre-galvanized steel pipe, hot-dip galvanized steel pipe, ERW pipe, square and rectangular tube, scaffolding tube, steel plate coils, cold-rolled steel sheet (coil) SPCC, pickled steel sheet (coil) SPHC, galvanized steel sheet (coil) SGCC/SECC, stainless steel sheet (coil) STS, aluminum sheet (coil) AL, silicon steel SI, and other advanced metals.
Our facilities span over 66,700 square meters, staffed by more than 300 highly trained employees and utilizing 8 High-Frequency welded lines. Every line is integrated with comprehensive equipment to ensure at least five production phases are completed perfectly. This dynamic infrastructure yields a massive monthly output of 100,000 tons, with half of our volume destined for international markets.
We maintain close cooperation with major steel plants across China and have established long-term strategic relationships with Hebei Iron and Steel Group, Baowu Iron and Steel Group, Shougang Iron and Steel Group, Bengang Group, Anshan Iron and Steel Group, Hebei Jingye Iron and Steel Group, Hebei Jinxi Iron and Steel Group, Lingyuan Iron and Steel Group, and New Tiangang Group. We sell more than 700,000 tons of steel domestically each year, generating an annual turnover of nearly 4 billion yuan.
A direct visualization of markets and applications served by STEP MILLION STEEL's output.
We integrate systematic verification throughout the product lifecycle to eliminate defects and ensure strict international standard alignment.
With over 20 specialized quality inspectors boasting a minimum of 10 years of experience, we audit every steel batch. We align all raw material selections and finished dimensional specifications with strict GB, ASTM, BS, or DIN standards. Our testing equipment, imported from engineering departments in Germany and Japan, conducts physical structural tests, weld micro-hardness testing, coating thickness gauges, and mechanical tensile stress tests.
Our service model is structured for global reliability. Any pricing inquiry receives a comprehensive quote response within 24 hours, with detailed technical drawings or production plan profiles completed inside 48 hours. Flexible payment systems, support for localized container loadings, and low initial trial order MOQ thresholds are designed to mitigate risks for foreign buyers starting new procurement relationships with us.
Understanding the shift towards sustainable structural design, advanced anti-corrosion chemistry, and green building codes.
The worldwide demand for high-strength steel tubing is transforming rapidly due to international pressure for carbon-neutral industrial components and pre-engineered building systems (PEBs). Products like our 20mm square steel profiles are increasingly specified over plastic or wood composites due to their 100% recyclability and high structural yield efficiency.
Transition to Advanced Galvanizing Formulations: Traditional simple galvanization is increasingly being replaced with composite coatings like zinc-aluminum-magnesium and high-spec hot-dip galvanizing. These composite alloy layers offer self-healing properties along cut edges, preventing red rust propagation even in highly corrosive marine or wet agricultural environments.
High-Strength Steel (HSS) Innovations: Developing steel alloys with higher yield strengths (such as Q355 or S355 equivalent grades) allows structural engineers to decrease material wall thicknesses without sacrificing load carrying parameters. This results in lighter structural frames, reduced logistics costs, and lowered carbon footprints during transport and erection phases.
Answers to essential technical, logistics, and quality questions frequently raised by global procurement departments.
