JIS G3444
STK290/STK400/STK500/STK490/STK540 used for civil engineering, architecture, steel towers, scaffoldings, struts, piles for suppression of landslide and other structures.
STK290/STK400/STK500/STK490/STK540 Chemical Composition
| Symbol of class | C | Si | Mn | P | S |
| STK290 | - | - | - | 0.050 max | 0.050 max |
| STK400 | 0.25 max | - | - | 0.040 max | 0.040 max |
| STK490 | 0.18 max | 0.55 max | 1.50 max | 0.040 max | 0.040 max |
| STK500 | 0.24 max | 0.35 max | 0.30 to 1.30 | 0.040 max | 0.040 max |
| STK540 | 0.23 max | 0.55 max | 1.50 max | 0.040 max | 0.040 max |
| Mechanical properties | Tensile strength N/mm2 | Yield point or proof stress N/mm2 | Elongation % | Bendability | Flattening | Tensile strength in welded zone N/mm2 | ||
| No.11 and No.12 test pieces | No.5 test piece | Bend angle | Inside radius (D: outside diameter of tube) | Distance between flattening plates (H) (D: outside diameter of tube) | ||||
| Longitudinal direction | Transverse direction | |||||||
| Method of manufacture | Seamless, butt-welding, electric resistance welding and arc welding process | Seamless, butt-welding, electric resistance welding process | Seamless, butt-welding, electric resistance welding process | Arc welding process | ||||
| Outside diameter | Full range | Full range | Over 40 mm | 50 mm or under | Full range | Over 350 mm | ||
| STK290 | 290 min | - | 30 min | 25 min | 90° 6D | 2/3D | 290 min | |
| STK400 | 400 min | 235 min | 23 min | 18 min | 90° 6D | 2/3D | 400 min | |
| STK490 | 490 min | 315 min | 23 min | 18 min | 90° 6D | 7/8D | 490 min | |
| STK500 | 500 min | 355 min | 15 min | 10 min | 90° 8D | 7/8D | 500 min | |
| STK540 | 540 min | 390 min | 20 min | 16 min | 90° 6D | 7/8D | 540 min | |
Our trade term: FOB, CFR, CIF, or other terms in Incoterms 2010.
Our payment term: T/T, L/C, detail can be talk.
Our delivery time: If we have stock, will deliver in 5 days, if no stock, will produce and deliver at the earliest time.
Origin of our product: China.
Our package: Package is sea worthy, also can be made as customer's requirement.
Our Shipping type: 20GP container, 40GP container, bulk carrier, and so on.
If you have special requirement, such as FORM E, FTA, or if you have questions about this material and product, please contact us, we can help.
Katalor Enterprise Co., Ltd is a comprehensive group involved in produce, process and sale different kinds of steel products. We can supply steel plates in different material, we also have the ability to process steel tubes, cutting piece, if you have demands, please tell us your required material, size (drawing), quantity and destination port, our sale person will send you offer at the earliest possible.
We can supply STK290/STK400/STK490/STK500/STK540 steel tube in different size, if you have demands about this product, please tell us. We can supply seamless pipe, weld pipe, with plain end or bevel end, hydro test and UT can be done if you need.
With the belief "Once believe, trust forever", Katalor Enterprise always see honesty as our company life, so we have long terms cooperation with many clients, sincerely hope work together with you.
