JIS G3444 STK400 STK500 Carbon Steel Tubes for Structure

Short Description:

JIS G3444 STK400 STK500 Carbon Steel Tubes

Standard: JIS G3444
Grade: STK400 STK500
OD. Range:4mm – 457mm
Wall thickness: 1mm-15mm
Tolerance: OD ± 0.1mm, ID± 0.1mm
Length: Random length or fixed length 5.8meters or 6meters ,Max length 12M
Type: Seamless steel tube
Packaging detail: Bundles with plastic paper packaged or wooden box package
Delivery date: 10-30days according to customers requirements.

Product Detail


Product Tags

JIS G3444 STK290,STK400 STK500 STK490 STK540 Carbon Steel Tubes for General Structural Purposes


Standard: JIS G 3444
Steel Grade: STK290,STK400 STK500 STK490 STK540 or per customer's request.
Relevant standard: KS D 3566 ASTM A500,A252, A501, BS 6323 
Size range: OD 5-420mm * WT 0.5-50mm *12000mm max

For general structural purposes,Tubes used for machinery, automobiles, bicycles, furniture, appliances and other machine parts.
Packing: Beveled/black painting/ plastic caps/ in bundles/ steel strips/ wooden protection
Inspection and Test: 
Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength, Yield Strength,Elongation, Flaring, Flattening, 
Bending, Hardness, Impact Test),Surface and Dimension Test,Nodestructive Test, Hydrostatic Test.Surface treatment:Oil-dip,
 Varnish, Passivation, Phosphating, Shot Blasting
Marks: As requested.
Delivery Condition:Annealed, Normalized, Normalized and Tempered

JIS G3444 Chemical composition,%: 

Steel grade  Chemical composition,%
C Si Mn P S


- - ≤0.050 ≤0.050
STK400 ≤0.025 - - ≤0.040 ≤0.040
STK500 ≤0.24 ≤0.35 0.30-1.30 ≤0.040 ≤0.040
STK490 ≤0.18 ≤0.55 ≤1.50 ≤0.040 ≤0.040
STK540 ≤0.23 ≤0.55 ≤0.1.5 ≤0.040 ≤0.040

JIS G3444 Mechanical Properties: 

Mechanical properties Tensile strength,N/mm2 Yield strength,N/mm2 Elongation,%
Longitudinal Transverse
OD All All ≥40mm
STK290 ≥290 - ≥35 ≥25
STK400 ≥400 ≥235 ≥23 ≥18
STK500 ≥500 ≥355 ≥15 ≥10
STK490 ≥490 ≥315 ≥23 ≥18
STK540 ≥540 ≥390 ≥20 ≥16


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