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STK540

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STK540

JIS G3444 STK540 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. This standard belongs to the Japanese Industrial Standard.

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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 STK540 Steel Pipe

The manufacturing method shall be as follows:

Tubes shall be manufactured by a combination of the tube manufacturing method and the finishing method shown in table 1. If necessary, appropriate heat treatment may be applied to the tube.

Tubes may be made using coated steel sheet or coated steel strip if so, requested by the purchaser.

Bevel end finishing may be applied under the purchaser’s specification, in which case the shape shall be based on the agreement between the manufacturer and the purchaser.

JIS G3444 STK540 Grade Symbol and Symbol of Manufacturing Method

Symbol of GradeSymbol of Manufacturing MethodMarking of Symbol of Manufacturing Method
Tube manufacturingFinishing method
STK540Seamless: S
Electric resistance
Butt welded: B
Automatic arc welded: A
Hot finished: H
Cold finished:  C
As electric resistance
welded: G
As given in clause 11 b)

JIS G3444 STK 540 Chemical Composition

Symbol of GradeCSiMnPS
STK5400.23 max.0.55 max.1.50 max.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 STK540 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 540 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.
STK540540 min.390 min.540 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 STK540 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 the tube axis directionTube axis directionPerpendicular to the tube axis direction
STK5402323182117
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 stk540

- 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.

Marking of JIS G3444 Steel Grade STK540

Each tube having passed the inspection shall be marked with the following items on each STK540 tube. For tubes of smaller outside diameter or when there is a special request by the purchaser, marking may be applied on a bundle. The order of arrangement of the markings is not specified. When approved by the purchaser, part of the items may be omitted.

  • Grade symbol
  • Symbol representing the manufacturing process. The following symbol should be used to indicate the production technique. However, a space may be used in place of the dash.
    1. As welded steel tube with electric resistance: -E-G
    2. Hot finished electric resistance welded steel tube:  -E-H
    3. Cold finished electric resistance welded steel tube:  -E-C
    4. Butt welded steel tube:  -B
    5. Automatic arc welded steel tube:  -A
  • Measurements Outside diameter and wall thickness should be noted for dimensions.
  • The manufacturer’s name or an abbreviation of the manufacturer’s name
  • Symbol representing the coating kind (in the case of using coated steel sheet or coated steel strip). The maker and purchaser shall agree on the symbol’s abbreviation.
  • Manufacturer’s name or its abbreviation
  • Symbol indicating the type of coating (in the case of using coated steel sheet or coated steel strip). Abbreviation of symbol shall be as agreed between the manufacturer and the purchaser.
    •  
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