TUSPIPE-LOGO-TIANJIN-UNITED-STEEL-PIPE-CO.,-LTD

STK500

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STK500

JIS G3444 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.

Outer Dimensions: 6mm ~ 350mm

Wall Thickness: 2mm~22 mm

Length: max 16000mm

Packing: Beveled/black painting/ plastic caps/ in bundles/ steel strips/ wooden protection
Surface treatment: Oil-dip, Varnish, Phosphating, Shot Blasting

Delivery Condition: Annealed, Normalized, Normalized and Tempered

Why choose tuspipe?

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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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 GradeCSiMnPS
STK5000.24 max.0.35 max.0.30 to 1.300.040 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 GradeTensile Strength
N/mm²
Yield Point of Proof Stress
N/mm²
Tensile Strength in Weld Zone
N/mm²
FlatteningBendability
Distance between Plates
(H)
Bend AngleInside Radius
Applied outside diameter
All outside diametersAll outside diametersAll outside diametersAll outside diameters50 mm max.
STK500500 min.355 min.500 min.7/8  D90°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 gradeTube Manufacturing Method
Seamless and butt weldedElectric resistance welded and automatic arc weldedAll manufacturing methods
Applied outside diameter
All outside diameters350 mmOver 350 mmAll 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 pieceNo.4 test piece
Tube axis directionTube axis directionPerpendicular to tube axis directionTube axis directionPerpendicular to tube axis direction
STK500151510149
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.

Dimensional Tolerances of JIS G3444 STK500

- Outside Diameter Tolerance a)

ClassificationOutside Diameter b)Tolerances on
Outside Diameter c)
Applicable Division
Class 1Under 50mm± 0.5mmApplied when there is no specification.
Applicable to hot-finished seamless steel tubes.
50mm or Over± 1%
Class 2Under 50mm± 0.25mmApplied when there is a specification.
Not applicable to hot-finished seamless steel tubes.
50mm or Over± 0.5%
Notesa) For the local parts such as repaired parts if the wall thickness can be confirmed to be
within the tolerance in the table below, the outside diameter tolerance of this table need not be applied.
b) The method for measuring the outside diameter of tubes exceeding 350mm in outside diameter may be determined by the circumferential length. The mutual conversion of outside diameter D and the circumferential length l shall be by the following formula:
     D = l  / π
Where D: outside diameter (mm)     l: circumferential length (mm)    π:3.1416
c) The tolerances on the outside diameter of ends of electric resistance welded and automatic
arc welded steel tubes exceeding 350mm in outside diameter shall be ±0.5%。

- Wall Thickness Tolerance a)

ClassificationFor Seamless Steel TubeFor Other than Seamless Steel TubeApplicable Division
Wall ThicknessTolerance of Wall ThicknessWall ThicknessTolerance of Wall Thickness
Class 1Under 4mm+0.6mm, -0.5mmUnder 4mm+0.6mm, -0.5mmApplied when there is no specification.
Applicable to hot-finished seamless steel tubes.
4mm or Over+15%, -12.5%4mm or Over to and excl. 12mm+15%, -12.5%
12mm or Over+15%, -1.5mm
Class 2Under 3mm±0.3mmUnder 3mm± 0.3mmApplied when there is a specification.
Not applicable to hot-finished seamless steel tubes.
3mm or Over±10%3mm or Over to and excl. 12mm±10%
12mm or Over+10%,-1.2mm
Notesa) The tolerances on the wall thickness of tubes exceeding 1016.0 mm in outside diameter may be agreed upon 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.

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