TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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Torich has experiences of production seamless precision tube for over 20 years, can support customers with various material like E215 E235
E355 St30Si St 30Al St35 St45 St 52 STKM 11 STC38 STKM 13 STKM 19 etc.As precision seamless steel pipe has good tolerance on OD
and WT,can used in Automotive application .
Size range: O.D.:6-420mm W.T.:1-50mm L:max12000mm
Production: Cold Drawn + Cold Rolling
Steel Grade and Chemical Compositions:
| Steel Grade | C | Si | Mn | P | S | Al | |
| Steel Name | Steel Number | max | max | max | max | max | min |
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.025 | 0.025 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 | - |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 | - |
| St 30Si | 0.10 | 0.30 | 0.55 | 0.04 | 0.04 | ||
| St30Al | 0.10 | 0.05 | 0.55 | 0.04 | 0.04 | ||
| St35 | 0.17 | 0.35 | 0.4 | 0.05 | 0.05 | ||
| St45 | 0.21 | 0.35 | 0.4 | 0.05 | 0.05 | ||
| St52 | 0.22 | 0.55 | 1.6 | 0.05 | 0.05 | ||
| Mechanical properties at room temperature | |||||||||||||
| Steel Grade | Minimum values for the delivery condition | ||||||||||||
| Steel Name | Steel Nubmer | (+Cc) | (+LCc) | (+SR) | (+Ad) | (+N) NBK | |||||||
| Rm Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % | ||
| E215 | 1.0212 | 430 | 8 | 380 | 12 | 380 | 280 | 16 | 280 | 30 | 290-430 | 215 | 30 |
| E235 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 350 | 16 | 315 | 25 | 340-480 | 235 | 25 |
| E355 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 | 10 | 450 | 22 | 490-630 | 355 | 22 |
aRm: tensile strength; ReH: upper yield strength; A: elongation after fracture
b 1Mpa=1N/mm2
c Depending on the degree of cold work in the finishing pass the yield strength may nearly be as high as the tensile strength.
For calculation purposes the following relations are recommended:
for delivery condition +C: ReH ≥0.8 Rm
for delivery condition +LC: ReH ≥0.7 Rm
d For calclulation purposes the following relation is recommended:ReH≥0.5Rm
e For tubes with outside diameter ≤30mm and wall thickness ≤3mm the ReH minimim values are 10Mpa lower than the values given in this Table
f For tubes with outside diameter>160mm: ReH≥420Mpa
DIN 2391 Seamless Precision Steel Tubes Mechanical Properties (Mpa)
| Grade | Material Number | Tensile Strength MPa or N/mm2 | Remaks (Similar to JIS) | Possibility Temperature | |
| Min Yield Point | Tensile Strength | ||||
| St30Si | 1.0211 | - | 400Min | (STKM11) | |
| - | 355Min | ||||
| - | 285Min | ||||
| 215 | 295~420 | ||||
| St30Al | 1.0212 | - | 400Min | (STKM11) | |
| - | 355Min | ||||
| - | 285Min | ||||
| 215 | 295~420 | ||||
| St35 | 1.0308 | - | 440Min | (STC38) | |
| - | 370Min | ||||
| - | 315Min | ||||
| 235 | 340~470 | ||||
| St45 | 1.0408 | - | 540Min | (STKM13) | |
| - | 470Min | ||||
| - | 390Min | ||||
| 255 | 440~570 | ||||
| St52 | 1.0580 | - | 590Min | (STKM19) | |
| - | 540Min | ||||
| - | 490Min | ||||
| 350 | 490~630 | ||||
AS per standard DIN 2391 , precision metal tubing there are four delivery condetion ,Cold-finished/Hard (Cold-finished as -drawn)BK
Cold-finished/Soft(lightkt cold-worked)BKW
Anealed GBK
Normalized NBK
