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JIS G3445 Carbon Steel Tubes

JIS G 3445 covers the manufacturing and inspection requirements for seamless and welded steel pipes. We offer JIS G 3445 carbon steel pipes in various steel grades, including STKM11A, STKM12 (A, B, C), STKM13 (A, B, C) and STKM14 (A, B, C).

UNIASEN’s JIS G 3445 carbon steel pipes range from 19.05 mm to 114.3 mm outer diameter and 2.0 mm to 14 mm wall thickness.

JIS G 3445 carbon steel pipes are resilient and durable, making them the preferred choice for industries such as nuclear power, natural gas, petrochemical, shipbuilding and boilers.

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JIS G3445 Specifications

Standard JIS3445
Procedure BW, ERW, SMLS
Dimensions 33.4 – 508mm
Thickness 3mm – 18mm
Unit Length specific, random
Steel Grade STKM11A, STKM12(A,B,C), STKM13(A,B,C), STKM14(A,B,C), STKM15(A,C), STKM16(A,C), STKM17(A,C), STKM18(A,B,C), STKM19(A,C), STKM20A
Surface Coating Varnishing, Oiling, Hot Dip Galvanizing
End Type Square cut, Plain, Bevelled, Threaded, Socket
Joint Method Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe Machining Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

JIS G3445 Dimension

Permissible Specified Outside Diameter and Specified Wall Thickness

Specified Outside Diameter

D mm

(in.)

Specified Wall Thickness

t

mm (in.)

Special Light Sizes a Regular Sizes
≥ 10.3 (0.405) to < 13.7 (0.540) ≥ 1.7 (0.068) to ≤ 2.4 (0.094)
≥ 13.7 (0.540) to < 17.1 (0.675) ≥ 2.2 (0.088) to ≤ 3.0 (0.118)
≥ 17.1 (0.675) to < 21.3 (0.840) ≥ 2.3 (0.091) to ≤ 3.2 (0.125)
≥ 21.3 (0.840) to < 26.7 (1.050) ≥ 2.1 (0.083) to ≤ 7.5 (0.294)
≥ 26.7 (1.050) to < 33.4 (1.315) ≥ 2.1 (0.083) to ≤ 7.8 (0.308)
≥ 33.4 (1.315) to < 48.3 (1.900) ≥ 2.1 (0.083) to ≤ 10.0 (0.394)
≥ 48.3 (1.900) to < 60.3 (2.375) ≥ 2.1 (0.083) to ≤ 12.5 (0.492)
≥ 60.3 (2.375) to < 73.0 (2.875) ≥ 2.1 (0.083) to ≤ 3.6 (0.141) > 3.6 (0.141) to ≤ 14.2 (0.559)
≥ 73.0 (2.875) to < 88.9 (3.500) ≥ 2.1 (0.083) to ≤ 3.6 (0.141) > 3.6 (0.141) to ≤ 20.0 (0.787)
≥ 88.9 (3.500) to < 101.6 (4.000) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 22.0 (0.866)
≥ 101.6 (4.000) to < 168.3 (6.625) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 25.0 (0.984)
≥ 168.3 (6.625) to < 219.1 (8.625) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 40.0 (1.575)
≥ 219.1 (8.625) to < 273.1 (10.750) ≥ 3.2 (0.125) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 40.0 (1.575)
≥ 273.1 (10.750) to < 323.9 (12.750) ≥ 3.6 (0.141) to ≤ 5.2 (0.203) > 5.2 (0.203) to ≤ 45.0 (1.771)
≥ 323.9 (12.750) to < 355.6 (14.000) ≥ 4.0 (0.156) to ≤ 5.6 (0.219) > 5.6 (0.219) to ≤ 45.0 (1.771)
≥ 355.6 (14.000) to < 457 (18.000) ≥ 4.5 (0.177) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 457 (18.000) to < 559 (22.000) ≥ 4.8 (0.188) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 559 (22.000) to < 711 (28.000) ≥ 5.6 (0.219) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 711 (28.000) to < 864 (34.000) ≥ 5.6 (0.219) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 52.0 (2.050)
≥ 864 (34.000) to < 965 (38.000) ≥ 5.6 (0.219) to ≤ 52.0 (2.050)
≥ 965 (38.000) to < 1422 (56.000) ≥ 6.4 (0.250) to ≤ 52.0 (2.050)
≥ 1422 (56.000) to < 1829 (72.000) ≥ 9.5 (0.375) to ≤ 52.0 (2.050)
≥ 1829 (72.000) to < 2134 (84.000) ≥ 10.3 (0.406) to ≤ 52.0 (2.050)
NOTE Standardized values for specified outside diameter and specified wall thickness of pipe are given in ISO 4200 [7] and ASME B36.10M[8]
a Pipe having the combination of specified outside diameter and specified wall thickness is defined as special light size pipe; other combinations given in this table are defined as regular size pipe.

JIS G3445 Chemical Requirement

Grade Symbol of Grade C Si Mn P S Nb or V
Grade 11 A STKM11A 0.12 max. 0.35 max. 0.60 max. 0.040 max. 0.040 max.
Grade 12 A STKM12A 0.20 max. 0.35 max. 0.60 max. 0.040 max. 0.040 max.
B STKM12B
C STKM12C
Grade 13 A STKM13A 0.25 max. 0.35 max. 0.30 to 0.90 0.040 max. 0.040 max.
B STKM13B
C STKM13C
Grade 14 A STKM14A 0.30 max. 0.35 max. 0.30 to 1.00 0.040 max. 0.040 max.
B STKM14B
C STKM14C
Grade 15 A STKM15A 0.25 to 0.35 0.35 max. 0.30 to 1.00 0.040 max. 0.040 max.
C STKM15C
Grade 16 A STKM16A 0.35 to 0.45 0.40 max. 0.40 to 1.00 0.040 max. 0.040 max.
C STKM16C
Grade 17 A STKM17A 0.45 to 0.55 0.40 max. 0.40 to 1.00 0.040 max. 0.040 max.
C STKM17C
Grade 18 A STKM18A 0.18 max. 0.55 max. 1.50 max. 0.040 max. 0.040 max.
B STKM18B
C STKM18C
Grade 19 A STKM19A 0.25 max. 0.55 max. 1.50 max. 0.040 max. 0.040 max.
C STKM19C
Grade 20 A STKM20A 0.25 max. 0.55 max. 1.60 max. 0.040 max. 0.040 max. 0.15 max.

JIS G3445 Mechanical Requirement

Grade Symbol of Grade Tensile Strength N/mm2 Yield Point or Proof Stress N/mm2 Elongation % Flattening Bendability
No.11 Test Piece No.12 Test Piece,tube axis direction No.Test Piece,perpendicular to tube axis Distance between flat plates Bend Angle Inside radius
Grade 11 A STKM11A 290 min. 35 min. 30 min. 1/2 D 180° 4 D
Grade 12 A STKM12A 340 min. 175 min. 35 min. 30 min. 2/3 D 90° 6 D
B STKM12B 390 min. 275 min. 25 min. 20 min. 2/3 D 90° 6 D
C STKM12C 470 min. 355 min. 20 min. 15 min.
Grade 13 A STKM13A 370 min. 215 min. 30 min. 25 min. 2/3 D 90° 6 D
B STKM13B 440 min. 305 min. 20 min. 15 min. 3/4 D 90° 6 D
C STKM13C 510 min. 380 min. 15 min. 10 min.
Grade 14 A STKM14A 410 min. 245 min. 25 min. 20 min. 3/4 D 90° 6 D
B STKM14B 500 min. 355 min. 15 min. 10 min. 7/8 D 90° 8 D
C STKM14C 550 min. 410 min. 15 min. 10 min.
Grade 15 A STKM15A 470 min. 275 min. 22 min. 17 min. 3/4 D 90° 6 D
C STKM15C 580 min. 430 min. 12 min. 7 min.
Grade 16 A STKM16A 510 min. 325 min. 20 min. 15 min. 7/8 D 90° 8 D
C STKM16C 620 min. 460 min. 12 min. 7 min.
Grade 17 A STKM17A 550 min. 345 min. 20 min. 15 min. 7/8 D 90° 8 D
C STKM17C 650 min. 480 min. 10 min. 5 min.
Grade 18 A STKM18A 440 min. 275 min. 25 min. 20 min. 7/8 D 90° 6 D
B STKM18B 490 min. 315 min. 23 min. 18 min. 7/8 D 90° 8 D
C STKM18C 510 min. 380 min. 15 min. 10 min.
Grade 19 A STKM19A 490 min. 315 min. 23 min. 18 min. 7/8 D 90° 6 D
C STKM19C 550 min. 410 min. 15 min. 10 min.
Grade 20 A STKM20A 540 min. 390 min. 23 min. 18 min. 7/8 D 90° 6 D

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