JIS G3472 Carbon steel pipes for automotive structures are used for rotor shafts, fluid lines, drive shafts, steering gears, seat belt tensioners, and airbag generator sleeves.
JIS G3472 ERW Tube Specification:
Grade: STAM 290GB, STAM 390G, STAM 440G, STAM 470G
OD: 15.9-101.6mm
WT: 1.0-6.0mm
Length: 3000 - 9000mm
JIS G3472 ERW automobile structure steel tube Chemical Composition Table:
|
Grade |
Chemical Composition % |
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|
C |
Si |
Mn |
P |
S | |
|
STAM 290GA |
0.12 max. |
0.35 max. |
0.60 max. |
0.035 max. |
0.035 max. |
|
STAM 290GB |
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|
STAM 340G |
0.20 max. |
0.35 max. |
0.60 max. |
0.035 max. |
0.035 max. |
|
STAM 390G |
0.25 max. |
0.35 max. |
0.30~0.90 |
0.035 max. |
0.035 max. |
|
STAM 440G |
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|
STAM 440H |
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|
STAM 470G |
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|
STAM 470H |
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|
STAM 500G |
0.30 max. |
0.35 max. |
0.30~1.00 |
0.035 max. |
0.035 max. |
|
STAM 500H |
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|
STAM 540H |
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JIS G3472 ERW automobile structure steel tube Mechanical Properties Table:
|
Grade |
Designation |
Tensile strength (MPa) |
Yield Strength |
Elongation (1)% |
Flaring test (2) |
| No.11 Test piece No.12 Test piece |
Size of the flared bell portion (D: OD) |
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| Longitudinal direction | |||||
|
Grade G |
STAM 290GA |
290 min. |
175 min. |
40 min. |
1.25 D |
|
STAM 290GB |
290 min. | 175 min. | 35 min. | 1.20 D | |
|
STAM 340G |
340 min. |
195 min. |
35 min. |
1.20 D | |
|
STAM 390G |
390 min. |
235 min. |
30 min. |
1.20 D | |
|
STAM 440G |
440 min. |
305 min. |
25 min. |
1.15 D | |
|
STAM 470G |
470 min. | 325 min. | 22 min. | 1.15 D | |
|
STAM 500G |
500 min. |
355 min. |
18 min. |
1.15 D | |
| Grade H |
STAM 440H |
440 min. |
355 min. |
20 min. |
1.15 D |
|
STAM 470H |
470 min. |
410 min. |
18 min. |
1.10 D | |
|
STAM 500H |
500 min. | 430 min. | 16 min. | 1.10 D | |
|
STAM 540H |
540 min. |
480 min. |
13 min. |
1.05 D |
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