JIS G3445 CARBON STEEL PIPES FOR MACHINE STRUCTURAL PURPOSES

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Scope

 Grade Designation Chemical Composition (%) Tensile Test (min.) Bending Flattening Test
C Si Mn P

(max.)

 S

(max.)

 Tensile strength N/mm2 Yield Point or Proof stress N/mm2 Elongation (%) Bend angle inside radius (D is outside dia. of the tube) Distance between flat plates (H)       (D is outside dia. of the tube)
No 4 No 11, No 12 test pieces longitudinal direction No 4, No 5 test pieces transverse direction

Machinery,

Automobiles,

Bicycles,

Furnitures,

Appliances

and other

machine parts

 11 A STKM11A 0.12 max 0.35 max 0.60 max 0.040 0.040 290 min - 35 min 30 min 1800 H=1/2D
12 A STKM12A 0.20 max 0.35 max 0.60 max 0.040 0.040 340  min 175 min 35 min 30 min R=4D H=2/3D
B STKM12B 390 min 275 min 25 min 20 min 900 R=6D H=2/3D
C STKM12C 470 min 355 min 20 min 15 min - -
13 A STMK13A 0.25 max 0.35 max 0.30 ~0.90 0.040 0.040 370 215 30 25 900 R=6D H=2/3D
B STKM13B 440 305 20 15 900 R=6D H=3/4D
C STKM13C 510 380 15 10 - -
14 A STKM14A 0.30 max 0.35 max 0.30 ~1.00 0.040 0.040 410 245 25 20 900 R=6D H=3/4D
B STKM14B 500 355 15 10 900 R=6D H=7/8D
C STKM14C 550 410 15 10 - -
15 A STKM15A 0.25 ~0.35 0.35 max 0.30 ~1.00 0.040 0.040 470 275 22 17 900 R=6D H=3/4D
C STKM15C 580 430 12 7 - -
16 A STKM16A 0.35 ~0.45 0.40 max 0.40 ~1.00 0.040 0.040 510 325 20 15 900 R=8D H=7/8D
C STKM16C 620 460 12 7 - -
17 A STKM17A 0.45 ~0.55 0.40 max 0.40 ~1.00 0.040 0.040 550 345 20 15 900 R=8D H=7/8D
C STKM17C 650 480 10 5 - -
18 A STKM18A 0.18 max 0.55 max 1.50 max 0.040 0.040 440 275 25 20 900 R=6D H=7/8D
B STKM18B 490 315 23 18 900 R=8D H=7/8D
C STKM18C 510 380 15 10 - -
19 A STKM19A 0.25 max 0.55 max 1.50 max 0.040 0.040 490 315 23 18 900 R=6D H=7/8D
C STKM19C 550 440 15 10 - -
20 A STKM20A 0.25 max 0.55 max 1.60 max 0.040 0.040 540 390 23 18 900 R=6D H=7/8D