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: JIS G3444

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

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.

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