JIS G3444 STK400 STK500 Carbon Steel Tubes for Structure
JIS G3444 STK290,STK400 STK500 STK490 STK540 Carbon Steel Tubes for General Structural Purposes
Description:
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 Application: 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 | |
| STK290 |
- |
- | - | ≤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 |
