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JIS G3444 Structural Steel Pipe
JIS G3444 structural steel pipe is one of main products in WANLEI. JIS G3444 steel grades include STK290, STK400, STK500, STK490, STK540. Welcome to visit our website to purchase JIS G3444 structural steel pipe.
Description
JIS G3444 structural steel pipe
JIS G3444 carbon steel tubes for general structural purposes
Chemical composition of JIS G3444 structural steel pipe
Symbol of grade | C | Si | Mn | P | S |
STK290 | - | - | - | ≤0.050 | ≤0.050 |
STK400 | ≤0.25 | - | - | ≤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 | ≤1.50 | ≤0.040 | ≤0.040 |
Remarks:
1) Alloying elements other than those in the above table may be added, if necessary.
2) For the tube of grade STK540 exceeding 12.5mm in wall thickness, the chemical composition may be agreed upon by the purchaser and manufacturer.
3) When the purchaser requires product analysis for the tube made of killed steel, the tolerances for the values given in the above table shall be as specified in Tolerance on product analysis in JIS G0321
Mechanical properties of JIS G3444 structural steel pipe
Mechanical properties | Tensile strength MPa | Yield point or proof stress MPa | Elongation % | Bendability (a) | Flattening | ||
Longitudinal direction | Transverse direction | Bend angle | Inside radius (D: outside diameter of tube) | Distance between flattening plates (H) (D: outside diameter of tube) | |||
Method of manufacture | Seamless, butt-welding, ERW, and arc welding process | Seamless, butt-welding, ERW process | Seamless, butt-welding, ERW process | ||||
Outside diameter | Full range | Full range | Over 40mm | 50mm or under | Full range | ||
STK290 | ≥290 | - | ≥30 | ≥25 | 90 | 6D | 2/3D |
STK400 | ≥400 | ≥235 | ≥23 | ≥18 | 90 | 6D | 2/3D |
STK500 | ≥500 | ≥355 | ≥15 | ≥10 | 90 | 8D | 7/8D |
STK490 | ≥490 | ≥315 | ≥23 | ≥18 | 90 | 6D | 7/8D |
STK540 | ≥540 | ≥390 | ≥20 | ≥16 | 90 | 6D | 7/8D |
Note (a): The bend test, instead of the flattening test, shall be applied to the tube 50mm or under in outside diameter only when specified by the purchaser.
Tolerances on dimensions of JIS G3444 structural steel pipe
Tolerances on dimensions shall be as follows:
The tolerances on outside diameter and wall thickness of the tube shall be as specified.
Classification | Tolerances |
Class 1 | Under 50mm ±0.5mm 50mm or over ±1% |
Class 2 | Under 50mm ±0.25mm 50mm or over ±0.5% |
Remarks: 1) The tolerances on the outside diameter of hot finished seamless steel tubes shall follow Class 1
2) The tolerance on the outside diameter of ERW and arc welded steel tubes exceeding 350mm in outside diameter shall follow Class 1, and the tolerances thereof at tube ends shall be within ±0.5%
3) The outside diameter of tubes exceeding 350mm in outside diameter may be determined by the length of circumference.
Tolerance on wall thickness
Classification | Tolerance | |
Seamless steel tube | Other than seamless steel tube | |
Class 1 | Under 4mm +0.6mm, -0.5mm 4mm or over +15%, -12.5% | Under 4mm +0.6mm, -0.5mm 4mm or over to and excl. 12mm +15%, -12.5% 12mm or over +15%, -1.5mm |
Class 2 | Under 3mm ±0.3mm 3mm or over ±10% | Under 3mm ±0.3mm 3mm or over to and excl. 12mm ±10% 12mm or over +10%, -1.2mm |
Remark: 1) The tolerances on wall thickness of hot finished seamless steel tubes shall follow Class 1.
2) The tolerance on wall thickness of tubes exceeding 1016.0mm in outside diameter may be agreed upon between the purchaser and the manufacturer.
Marking
Each tube having passed the inspection shall be marked with the following items:
(1) Symbol of grade
(2) Symbol which denotes method of manufacture
(3) Dimensions
(4) Manufacturer’s name or its identifying brand
Report
The manufacturer shall submit a test report when previously requested by the purchaser.
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