|
| الـ MOQ: | 1 طن |
| السعر: | قابل للتفاوض |
| العبوة القياسية: | في حزم أو في صناديق خشبية. |
| فترة التسليم: | 20-40 يوم |
| طريقة الدفع: | L/C ، D/A ، D/P ، T/T ، Western Union ، Moneygram |
| القدرة على التوريد: | 60000 طن/طن في السنة |
These are carbon steel seamless or welded tubes conforming to Japanese Industrial Standard JIS G3444. They are designed for general structural use: civil engineering, architecture, piles, frameworks, etc. The grades STK290, STK400, STK490, STK500, STK540 denote different strength levels.
| Grade | C (max) | Si (max) | Mn (max) / range | P (max) | S (max) |
|---|---|---|---|---|---|
| STK290 | – | – | – | 0.050 % | 0.050 % |
| STK400 | 0.25 % | – | – | 0.040 % | 0.040 % |
| STK490 | 0.18 % | 0.55 % | 1.65 % | 0.035 % | 0.035 % |
| STK500 | 0.24 % | 0.35 % | 0.30 ‒ 1.30 % | 0.040 % | 0.040 % |
| STK540 | 0.23 % | 0.55 % | 1.50 % | 0.040 % | 0.040 % |
Here are the mechanical property minima required by the standard for the different grades. This covers tensile strength, yield or proof stress, weld-zone tensile strength, bending & flattening tests. Elongation also specified.
| Grade | Tensile Strength, min (Rm) [N/mm²] | Yield Point / Proof Stress, min [N/mm²] | Weld Tensile Strength, min [N/mm²] | Elongation, min % | Flattening / Bend Tests |
|---|---|---|---|---|---|
| STK290 | 290 | — | 290 | 30 % (Seamless & Butt welded) / 30 % (ERW etc.) / smaller reductions for larger OD or other methods | Flattening: distance between flat plates = 2/3 D; Bend: 90° bend, inside radius = 6D |
| STK400 | 400 | 235 | 400 | ~23 % for most tube manufacturing; lower for certain large diameters or weld types | Flattening: 2⁄3 D; Bend: 90°, 6D |
| STK490 | 490 | 315 | 490 | ~23 % or similar; reduced in certain test piece directions or larger ODs | Flattening: 7⁄8 D; Bend: 90°, 6D |
| STK500 | 500 | 355 | 500 | somewhat lower elongation (~15-18 %) for larger tubes or more highly worked materials; see standard | Flattening: 7⁄8 D; Bend: 90°, 8D |
| STK540 | 540 | 390 | 540 | similar to STK500, depending on OD and method; elongation tends to drop somewhat with the higher strength grades | Flattening: 7⁄8 D; Bend: 90°, 8D |
Graded Strength Levels: Users can select the grade according to structural needs— from basic strength (STK290) to high strength (STK540).
Versatility in Manufacturing: Available seamless or welded, with finishing options. Allows adaptation to application demands and cost/performance trade-offs.
Good Ductility / Toughness especially in lower grades—ensures resistance to brittle failure, suitable for bending, welding, fabrication.
Rigorous Quality Tests: Flattening, bend tests, weld tensile strength etc. help ensure integrity.
Dimensional & Tolerance Standards ensure interchangeability and predictable behavior.
JIS G3444 itself is the primary executing standard.
Related standards for chemical analyses and finished product analysis: JIS G0320 (heat / melt analysis), JIS G0321 (product analysis)
Mechanical test method standards cited or used in conjunction: flattening test, bending test, tensile test etc. (within JIS G3444).
| Domain | Specific Uses |
|---|---|
| Civil Engineering & Construction | Support columns, beams, frameworks, building facades, scaffolding, footings, piles for foundations, retaining structures, structural bracing. |
| Infrastructure | Piles for bridges, piles for landslide suppression, retaining walls, utility structures. |
| Architectural Structures | Towers, handrails, perimeter fences, decorative structures where structural load + aesthetic finish needed. |
| Industrial Buildings / Equipment | Frameworks, supports for equipment, overhead structures, racks, platforms. |
| Temporary / Modular Structures | Scaffolding systems, temporary shelters, shipping container adaptations. |
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
|
|
| الـ MOQ: | 1 طن |
| السعر: | قابل للتفاوض |
| العبوة القياسية: | في حزم أو في صناديق خشبية. |
| فترة التسليم: | 20-40 يوم |
| طريقة الدفع: | L/C ، D/A ، D/P ، T/T ، Western Union ، Moneygram |
| القدرة على التوريد: | 60000 طن/طن في السنة |
These are carbon steel seamless or welded tubes conforming to Japanese Industrial Standard JIS G3444. They are designed for general structural use: civil engineering, architecture, piles, frameworks, etc. The grades STK290, STK400, STK490, STK500, STK540 denote different strength levels.
| Grade | C (max) | Si (max) | Mn (max) / range | P (max) | S (max) |
|---|---|---|---|---|---|
| STK290 | – | – | – | 0.050 % | 0.050 % |
| STK400 | 0.25 % | – | – | 0.040 % | 0.040 % |
| STK490 | 0.18 % | 0.55 % | 1.65 % | 0.035 % | 0.035 % |
| STK500 | 0.24 % | 0.35 % | 0.30 ‒ 1.30 % | 0.040 % | 0.040 % |
| STK540 | 0.23 % | 0.55 % | 1.50 % | 0.040 % | 0.040 % |
Here are the mechanical property minima required by the standard for the different grades. This covers tensile strength, yield or proof stress, weld-zone tensile strength, bending & flattening tests. Elongation also specified.
| Grade | Tensile Strength, min (Rm) [N/mm²] | Yield Point / Proof Stress, min [N/mm²] | Weld Tensile Strength, min [N/mm²] | Elongation, min % | Flattening / Bend Tests |
|---|---|---|---|---|---|
| STK290 | 290 | — | 290 | 30 % (Seamless & Butt welded) / 30 % (ERW etc.) / smaller reductions for larger OD or other methods | Flattening: distance between flat plates = 2/3 D; Bend: 90° bend, inside radius = 6D |
| STK400 | 400 | 235 | 400 | ~23 % for most tube manufacturing; lower for certain large diameters or weld types | Flattening: 2⁄3 D; Bend: 90°, 6D |
| STK490 | 490 | 315 | 490 | ~23 % or similar; reduced in certain test piece directions or larger ODs | Flattening: 7⁄8 D; Bend: 90°, 6D |
| STK500 | 500 | 355 | 500 | somewhat lower elongation (~15-18 %) for larger tubes or more highly worked materials; see standard | Flattening: 7⁄8 D; Bend: 90°, 8D |
| STK540 | 540 | 390 | 540 | similar to STK500, depending on OD and method; elongation tends to drop somewhat with the higher strength grades | Flattening: 7⁄8 D; Bend: 90°, 8D |
Graded Strength Levels: Users can select the grade according to structural needs— from basic strength (STK290) to high strength (STK540).
Versatility in Manufacturing: Available seamless or welded, with finishing options. Allows adaptation to application demands and cost/performance trade-offs.
Good Ductility / Toughness especially in lower grades—ensures resistance to brittle failure, suitable for bending, welding, fabrication.
Rigorous Quality Tests: Flattening, bend tests, weld tensile strength etc. help ensure integrity.
Dimensional & Tolerance Standards ensure interchangeability and predictable behavior.
JIS G3444 itself is the primary executing standard.
Related standards for chemical analyses and finished product analysis: JIS G0320 (heat / melt analysis), JIS G0321 (product analysis)
Mechanical test method standards cited or used in conjunction: flattening test, bending test, tensile test etc. (within JIS G3444).
| Domain | Specific Uses |
|---|---|
| Civil Engineering & Construction | Support columns, beams, frameworks, building facades, scaffolding, footings, piles for foundations, retaining structures, structural bracing. |
| Infrastructure | Piles for bridges, piles for landslide suppression, retaining walls, utility structures. |
| Architectural Structures | Towers, handrails, perimeter fences, decorative structures where structural load + aesthetic finish needed. |
| Industrial Buildings / Equipment | Frameworks, supports for equipment, overhead structures, racks, platforms. |
| Temporary / Modular Structures | Scaffolding systems, temporary shelters, shipping container adaptations. |
A: manufacturer,also can do trading.
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
