STK500
STK500
JISG3444 STK500 carbon steel tubes are utilized in civil engineering and architectural structures such as steel towers, footing piles, foundation piles, landslide suppression piles, and so on.
Standards:Â JIS G3444
Outer Dimensions:Â 6mm ~ 350mm
Wall Thickness:Â 2mm~22Â mm
Length: max 16000mm
Packing:Â Beveled/black painting/ plastic caps/ in bundles/ steel strips/ wooden protection
Surface treatment:Â Oil-dip, Varnish, Phosphating, Shot Blasting
Delivery Condition:Â Annealed, Normalized, Normalized and Tempered
PRODUCT FEATURES
Manufacturing Method of JIS G3444 Grade STK500 Steel Pipe
The manufacturing method of STK500 steel Pipe shall be as follows:
STK500 steel tubes shall be fabricated using a combination of the tube production technique and the finishing method described in table 1. The tube may be subjected to suitable heat treatment if necessary.
If the client requests it, tubes can be produced from coated steel sheet or coated steel strip.
Bevel end finishing may be performed per the purchaser’s specifications, in which case the shape should be determined by the manufacturer and the purchaser’s consent.
JIS G3444 STK 500 Chemical Composition
Symbol of Grade | C | Si | Mn | P | S |
STK500 | 0.24 max. | 0.35 max. | 0.30 to 1.30 | 0.040 max. | 0.040 max. |
Notes a) If necessary, alloying elements other than specified in this table may be added. b) For the tube of grade STK500 exceeding 12.5 mm in wall thickness, the chemical composition may be subject to the agreement between the purchaser and the manufacturer. | |||||
JIS G3444 Grade STK 500 Mechanical properties
Symbol of Grade | Tensile Strength  N/mm² | Yield Point of Proof Stress  N/mm² | Tensile Strength in Weld Zone  N/mm² | Flattening | Bendability | |
Distance between Plates (H) | Bend Angle | InsideRradius | ||||
Applied Outside Diameter | ||||||
All outside diameters | All outside diameters | All outside diameters | All outside diameters | 50 mm max. | ||
STK500 | 500 min. | 355 min. | 500 min. | 7/8 D | 90° | 6 D |
NOTE 1 D of this table is the outside diameter of the tubes. NOTE 2 1 N/mm²—1 MPa Note a) Standard of bend angle shall be the start point of bending. | ||||||
JIS G3444 Grade STK500 Tensile test piece and the minimum value of elongation
Symbol of grade | Tube Manufacturing Method | ||||
Seamless and Butt Welded | Electric Resistance Welded and Automatic arc Welded | All manufacturing Methods | |||
Applied Outside Diameter | |||||
All Outside Diameters | 350 mm | Over 350 mm | All Outside Diameters | ||
Test Piece and Direction of Test Piece | |||||
No. 11 test piece No. 12 test piece | No. 11 test piece No. 12 test piece | No.5 test piece | No.4 test piece | ||
Tube axis direction | Tube axis direction | Perpendicular to the tube axis direction | Tube axis direction | Perpendicular to the tube axis direction | |
STK500 | 15 | 15 | 10 | 14 | 9 |
For the tubes of outside diameter 40 mm or under, the elongation value in this table shall not be applied. However, the test result for these tubes shall be recorded. Further, the elongation may be specified by agreement between the manufacturer and the purchaser. | |||||
Other Tests
The buyer can request a hydraulic test, a non-destructive test at the weld, and so forth. In such circumstances, the test items, test piece sampling process, test method, and acceptance criterion should be as previously agreed upon between the maker and the purchaser.
