Carbon Steel Tubes
JIS–G–3445 — Carbon Steel Tubes for Machine Structural Purposes
JIS–G–3445 is a Japanese Industrial Standard specifying carbon steel tubes for machine structural purposes. These tubes are used in mechanical and structural applications requiring precise dimensional tolerances and consistent mechanical properties.
Carbon Steel Tubes for Machine Structural Purposes — Japanese Standard (JIS–G–3445)
ASTM A423, Grade-1 or ASTM 714 — Corten Air Heater Tubes
| Specification | Grade | Chemistry | Rm min. kgf/mm² N/mm² |
Re min. kgf/mm² N/mm² |
Bend Test D ≤ 50 mm |
'A' Elongation % min (Longitudinal) D > 40 mm |
Tolerances as per Division 3 | ||||||
| C% | Mn% | Bend Angle° |
Bend Diameter |
t ≤ 1mm | 1 < t ≤ 2 | 2 < t ≤ 3 | 3 < t ≤ 4 | On Outside Diameter |
On Thickness |
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| JIS : G–3445–1983 |
STKM–11A | 0.12 max. |
0.6 max. |
30 294 |
180 | 4D | 24 | 26 | 28 | 29 | D < 25 mm ± 0.12 mm |
t < 2 mm ± 0.15 mm |
|
| STKM–12A | 35 343 |
18 177 |
90 | 6D | 24 | 26 | 28 | 29 | 25 ≤ D < 40 mm ± 0.15 mm |
t > 2 mm ± 8% |
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| STKM–12B | 0.2 max. |
0.6 max. |
40 392 |
28 275 |
90 | 6D | 14 | 16 | 18 | 19 | 40 ≤ D < 50 mm ± 0.18 mm |
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| STKM–12C | 48 471 |
36 353 |
– | – | 10 | 11 | 12 | 14 | 50 ≤ D < 60 mm ± 0.20 mm |
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| STKM–13A | 38 373 |
22 216 |
90 | 6D | 20 | 21 | 22 | 24 | 60 ≤ D < 70 mm ± 0.23 mm |
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| STKM–13B | 0.25 max. |
0.3 / 0.9 |
45 441 |
31 304 |
90 | 6D | 10 | 11 | 12 | 14 | 70 ≤ D < 80 mm ± 0.25 mm |
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| STKM–13C | 52 510 |
39 382 |
– | – | 4 | 6 | 8 | 9 | |||||
| Rm: Tensile strength Re: Yield stress D: Outside diameter t: Wall thickness | |||||||||||||
Supply
Available in all STKM grades conforming to JIS–G–3445 : 1983. Custom sizes and lengths supplied on request to meet specific machine structural requirements.