STK290

STK290

Steel pipes made with STK290 (STK substance) are primarily used for the following applications.

Creating pillars (eaves pillars, outside pillars, etc.)

Piles of steel pipe

The building’s pillars are made of STK materials. Steel columns are usually hidden by decorative materials, so steel tubes (columns) with lower cross-section properties than square steel tubes are not used. If, however, the steel column’s form is visible from the outside, utilize a cylindrical steel pipe.

PRODUCT FEATURES

Chemical Composition of JIS G3444 STK290

Symbol of grade

C

Si

Mn

P

S

STK290

0.050 max.

0.050 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.

Mechanical Properties of JIS G3444 STK290

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

Inside Radius

Applied outside diameter

All outside diameters

All outside diameters

All outside diameters

All outside diameters

50 mm max.

STK290

290 min.

290 min.

 2/3 D

90°

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.

STK290 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 tube axis direction

Tube axis direction

Perpendicular to tube axis direction

STK290

30

30

25

28

23

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.

Marking of JIS G3444 Steel Grade STK290

Each tube having passed the inspection shall be marked with the following items on each STK290 tube. For tubes of a 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
  • A 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
  • A 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.
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