JIS G3445 STKM11A STKM13A ERW Welded Carbon Steel Tube For Auto Exhaust System
Size Range:
OD: 5.0-200mm
WT:0.5-20mm
Length: max 7000mm
Manufacture:
Tubes are made by welded process.
Welded tubing shall be made from flat-rolled steel by the electric-resistance welding or electric-fusion welding process.
Delivery Condition:
HR: hot rolled
CW: cold rolled
SR: stress relieved
A: annealed
N: normalized
Steel Grade/Steel Material:
Chemical Composition unit:% max | ||||||||
Grade | Symbol of grade | C | Si | Mn | P | S | Nb or V | |
11 | A | STKM11A | 0.12 | 0.35 | 0.60 | 0.040 | 0.040 | - |
12 | A | STKM12A | 0.20 | 0.35 | 0.60 | 0.040 | 0.040 | - |
B | STKM12B | |||||||
C | STKM12C | |||||||
13 | A | STKM13A | 0.25 | 0.35 | 0.30-0.90 | 0.040 | 0.040 | - |
B | STKM13B | |||||||
C | STKM13C | |||||||
14 | A | STKM14A | 0.30 | 0.35 | 0.30-1.00 | 0.040 | 0.040 | - |
B | STKM14B | |||||||
C | STKM14C | |||||||
15 | A | STKM15A | 0.25-0.35 | 0.35 | 0.30-1.00 | 0.040 | 0.040 | - |
C | STKM15C | |||||||
16 | A | STKM16A | 0.35-0.45 | 0.40 | 0.40-1.00 | 0.040 | 0.040 | - |
C | STKM16C | |||||||
17 | A | STKM17A | 0.45-0.55 | 0.40 | 0.40-1.00 | 0.040 | 0.040 | - |
C | STKM17C | |||||||
18 | A | STKM18A | 0.18 | 0.55 | 1.50 | 0.040 | 0.040 | - |
B | STKM18B | |||||||
C | STKM18C | |||||||
19 | A | STKM19A | 0.25 | 0.55 | 1.50 | 0.040 | 0.040 | - |
C | STKM19C | |||||||
20 | A | STKM20A | 0.25 | 0.55 | 1.60 | 0.040 | 0.040 | 0.15 |
Remarks: 1. For the tubes of Grade 15 made by electric resistance welded, the lower limit of C may be altered by agreement between the purchaser and the manufacturer. 2. For the tubes of Grade 20, Nb in combination with V may be added. In the case, the maximum content of Nb + V shall be 0.15%. 3. If necessary, alloying elements other than those in the above table may be added. |
Mechanical Properties
Mechanical Properties min | |||||
Grade | Symbol of grade | Tensile strength N/mm2 | Yield point or proof strength N/mm2 | Elongation % | |
11 | A | STKM11A | 290 | - | 35 |
12 | A | STKM12A | 340 | 175 | 35 |
B | STKM12B | 390 | 275 | 25 | |
C | STKM12C | 470 | 355 | 20 | |
13 | A | STKM13A | 370 | 215 | 30 |
B | STKM13B | 440 | 305 | 20 | |
C | STKM13C | 510 | 380 | 15 | |
14 | A | STKM14A | 410 | 245 | 25 |
B | STKM14B | 500 | 355 | 15 | |
C | STKM14C | 550 | 410 | 15 | |
15 | A | STKM15A | 470 | 275 | 22 |
C | STKM15C | 580 | 430 | 12 | |
16 | A | STKM16A | 510 | 325 | 20 |
C | STKM16C | 620 | 460 | 12 | |
17 | A | STKM17A | 550 | 345 | 20 |
C | STKM17C | 650 | 480 | 10 | |
18 | A | STKM18A | 440 | 275 | 25 |
B | STKM18B | 490 | 315 | 23 | |
C | STKM18C | 510 | 380 | 15 | |
19 | A | STKM19A | 490 | 315 | 23 |
C | STKM19C | 550 | 410 | 15 | |
20 | A | STKM20A | 540 | 390 | 23 |
Remarks: 2. 1 N/mm2 = 1MPa |
Packing: in bundles, in wooden boxes.