Welcome to ALLLAND Steel Pipe Co., Ltd.
Welcome to ALLLAND Steel Pipe Co., Ltd.
ALLLAND Steel Pipe Supply
Welcome to ALLLAND Steel Pipe Manufacturing.JIS G3444 STK540 Steel Pipe is a high-strength carbon steel structural tube with a minimum tensile strength of 540 MPa. Manufactured for demanding structural applications, it is widely used in steel towers, foundation piles, heavy-duty structures, and civil engineering projects requiring high load-bearing capacity and durability.
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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JIS G3444 STK540 Steel Pipe is a high-strength carbon steel tube for general structural purposes under the Japanese Industrial Standards (JIS). It is one of the highest strength grades within the **JIS G3444 Carbon Steel Tubes for General Structural Purposes** category.
STK540 is primarily used in building structures, steel towers, foundation piles, engineering supports, and large-scale steel structure projects that require high load-bearing capacity.
O.D.:
21.7 mm – 1016.0 mm
W.T.:
2.0 mm – 22.0 mm
Length:
Usually 5.5 m – 12 m, available in fixed or multiple lengths; custom lengths per project requirements.
Manufacturing Method:
Seamless, ERW, Butt Welded, Automatic Arc Welded
Standard Name:
Carbon Steel Tubes for General Structural Purposes
Steel Grades:
STK540
Tube Ends& Surface Treatment:
Square, Chamfered; Black Skin, Pickled, Painted/Oiled for Rust Prevention
Delivery Conditions:
Grade, Specification, Furnace Number, Standard
The designation JIS G3444 STK540 represents:
| Designation | Meaning |
|---|---|
| JIS | Japanese Industrial Standards |
| G3444 | Standard designation for Carbon Steel Tubes for General Structural Purposes |
| STK | Steel Tube for Structure |
| 540 | Minimum tensile strength ≥ 540 MPa |
JIS G3444 STK540 = High-strength structural carbon steel pipe with a minimum tensile strength of 540 MPa.
STK540 is a low-carbon, high-strength structural steel that achieves good strength and toughness through alloying and rolling processes.
| Element | Maximum Content |
| Carbon (C) | ≤0.23% |
| Silicon (Si) | ≤0.55% |
| Manganese (Mn) | ≤1.50% |
| Phosphorus (P) | ≤0.040% |
| Sulfur (S) | ≤0.040% |
| Property | Requirement |
|---|---|
| Tensile Strength | ≥540 MPa |
| Yield Strength / Proof Stress | ≥390 MPa |
| Weld Zone Tensile Strength | ≥540 MPa |
| Elongation | Approximately 17–23% (depending on pipe diameter and test specimen direction) |
Compared with:
STK400 → Suitable for general structural applications
STK490 → Suitable for medium-to-high strength structural applications
STK540 → Suitable for high-strength and heavy-load structural applications
JIS G3444 STK540 Steel Pipe dimensions are specified according to JIS G3444 Carbon Steel Tubes for General Structural Purposes. The standard covers structural carbon steel tubes with outside diameters generally ranging from 21.7 mm to 1016.0 mm. The unit weight is calculated based on a steel density of 7.85 g/cm³ using the formula:
W = 0.02466 × t × (D − t)
Where:
| Nominal Size | Outside Diameter (mm) | Wall Thickness (mm) | Weight (kg/m) | Cross Section Area (cm²) |
| 15A | 21.7 | 2.0 | 0.972 | 1.238 |
| 20A | 27.2 | 2.0 | 1.24 | 1.58 |
| 25A | 34.0 | 2.3 | 1.86 | 2.37 |
| 32A | 42.7 | 2.3 | 2.35 | 2.99 |
| 40A | 48.6 | 2.4 | 2.74 | 3.49 |
| 50A | 60.5 | 2.3 | 3.30 | 4.21 |
| 50A | 60.5 | 3.2 | 4.52 | 5.76 |
| 65A | 76.3 | 2.8 | 5.08 | 6.47 |
| 65A | 76.3 | 4.2 | 7.47 | 9.51 |
| 80A | 89.1 | 3.2 | 6.78 | 8.64 |
| 80A | 89.1 | 4.2 | 8.79 | 11.20 |
| 100A | 114.3 | 3.5 | 9.56 | 12.18 |
| 100A | 114.3 | 4.5 | 12.2 | 15.54 |
| 125A | 139.8 | 4.5 | 15.0 | 19.1 |
| 150A | 165.2 | 4.5 | 17.8 | 22.7 |
| 150A | 165.2 | 6.0 | 23.6 | 30.0 |
| 200A | 216.3 | 6.0 | 31.2 | 39.7 |
| 200A | 216.3 | 8.0 | 41.0 | 52.2 |
| 250A | 267.4 | 6.6 | 42.4 | 54.0 |
| 250A | 267.4 | 9.0 | 57.8 | 73.6 |
| 300A | 318.5 | 6.9 | 52.8 | 67.3 |
| 300A | 318.5 | 9.5 | 72.8 | 92.8 |
| 350A | 355.6 | 9.5 | 82.0 | 104.5 |
| 400A | 406.4 | 9.5 | 94.3 | 120.1 |
| 450A | 457.2 | 12.7 | 139 | 177.3 |
| 500A | 508.0 | 12.0 | 147 | 187.0 |
| 500A | 508.0 | 19.0 | 229 | 291.9 |
| 600A | 609.6 | 12.7 | 188 | 239.6 |
| 600A | 609.6 | 19.0 | 279 | 355.5 |
| 700A | 711.0 | 16.0 | 275 | 350.5 |
| 800A | 812.8 | 19.0 | 372 | 474.0 |
| 900A | 914.4 | 22.0 | 489 | 623.0 |
| 1000A | 1016.0 | 25.0 | 611 | 778.0 |
JIS G3444 STK540 Steel Pipe is widely used in high-strength structural and civil engineering projects requiring excellent load-bearing capacity and durability.
1. Steel Structures
Used for:
2. Steel Towers
Applications include:
3. Foundation Piles
Used in:
4. Construction Support
Common applications include:
| STK490 | STK540 | |
| Tensile Strength | ≥490 MPa | ≥540 MPa |
| Strength Level | High | Higher |
| Weight Saving Potential | Good | Better |
| Application | General heavy structures | Heavy-load structures |
Yes. Hot-dip galvanizing and other anti-corrosion coatings can be applied according to project requirements.
Yes. ALLLAND supplies JIS G3444 STK540 steel pipes with customized sizes, inspection documents, and export packaging.
Yes. STK540 has a higher minimum tensile strength (540 MPa) compared with STK490 (490 MPa).
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