JIS G3454 STPG 370 Carbon Steel Pipes For Pressure Service - Womic Steel Group
We are the professional manufacture supplier and exporter of JIS G3454 STPG370 Seamless Pipes in China over 20 years.
JIS G3454 STPG 370 Carbon Steel Pipes used for pressure service at an approximate maximum temperature of 350℃.
This Japanese Industrial Standard specifies the carbon steel pipes—referred to as “pipes”—used for pressure service at a maximum temperature of approximately 350°C. For applications requiring higher pressure resistance, the pipes shall comply with JIS G3455.
Womic Steel Group — Breakthrough in JIS Non-Standard Pipe Production
Facing increasing market challenges and growing demand for JIS-grade pipes, Womic Steel Group recognized the long-standing difficulties faced by customers. In response, we rapidly organized a specialized team from our Technical, R&D, and Equipment departments, investing substantial manpower and resources to resolve the manufacturing bottlenecks of non-standard JIS pipe sizes.
Through continuous technical innovation and process optimization, Womic successfully achieved stable, mass production of the full series of JIS seamless steel pipes with outer diameters ranging from 139.8 mm to 318.5 mm.
This milestone not only signifies another major advancement in Womic’s production technology, but also completely alleviates the specification shortage that has long troubled the global market.
Applications and Industry Significance
Steel pipes manufactured in accordance with standards such as JIS G3454 STPG370 are widely used in:
Shipbuilding
Petrochemical plants
Boilers and pressure systems
Heavy machinery
Industrial pipelines
We have always believed that the market’s challenges are our responsibility. This achievement not only ensures the “existence” of the required specifications, but more importantly guarantees their quality and performance.
All Womic JIS steel pipes fully comply with the JIS standard requirements in terms of:
Dimensional precision
Mechanical strength
Corrosion resistance
Pressure performance
Additionally, Womic can provide JIS-compliant pipe materials with ship classification certificates from: ABS, DNV, BV, LR, CCS, KR, NK, RINA, RS
“Small Batch”, “Multiple Varieties”, “Special Requirements” — Womic Delivers
Whether your needs involve small quantity orders, diverse specifications, or special technical requirements, Womic Steel Group is dedicated to providing solutions tailored to your application.
Welcome to contact us by email : sales@womicsteel.com
Production Types of Womic JIS Manufacturing Pipes
Manufacturing Methods
Seamless pipe manufacturing
Electric resistance welded (ERW) pipe manufacturing
Heat Treatment Requirements
Pipes are generally supplied as-manufactured
Cold-finished pipes must be annealed after manufacturing
|
Available Standards |
Available Steel Grades |
|
JIS G3454 – Carbon Steel Pipes for Pressure Service Pressure Service (STPG Grades): |
STPG 370 |
|
STPG 410 |
|
|
JIS G3455 – Carbon Steel Pipes for High Pressure Service Machine & Structural Use (STS Grades): |
STS 370 |
|
STS 410 |
|
|
STS 480 |
|
|
JIS G3456 – Carbon Steel Pipes for High Temperature Service Pipe for High-Temperature Service (STPT Grades): |
STPT 370 |
|
STPT 410 |
|
|
STPT 480 |
Welcome to contact us by email : sales@womicsteel.com
Specifications of Womic JIS G3454 Carbon Steel Tube/Pipes
1. Mechanical Properties of JIS G3454 STPG370 Seamless Pipes
| Grade | Tensile Property (N/mm2) | Yield Point or YieldStrength (N/mm2) |
|
||||
| NO. 11 Sample; NO.12 Sample | NO. 5 Sample | NO. 4 Sample | |||||
| Longitudinal | Transverse | Longitudinal | Transverse | ||||
| STPG370 | ≥ 370 | ≥ 215 | ≥ 30 | ≥ 25 | ≥ 28 | ≥ 23 | |
| STPG410 | ≥ 410 | ≥ 245 | ≥ 25 | ≥ 20 | ≥ 24 | ≥ 19 | |
Note(JIS G3454 STPG370 Seamless Pipes) :
1. For the carbon steel pipes with the thickness of less than 8 mm, we use NO.12 or NO.5 sample for tensile test. The minimum elongation will be reduced by 1.5% from the table value when the thickness reduces 1 mm. The value obtained will be rounded to an integer value according to JIS Z8401 (a rounding method).
2. The above elongation is not applicable for the carbon steel tubes with the nominal pipe diameter of equal or less than 25A. This must be recorded.
3. When we take the electric resistance welded steel pipes for tensile test, we also choose NO.12 or NO.5 sample from the parts not containing welding seams. For the carbon steel pipes with the thickness of less than 8 mm, we use the elongation of NO.12 sample (longitudinal) or NO.5 sample (transverse) to calculate.
| Grade | Sample Shape |
|
|||||||
| >7~＜8 | >6~＜7 | >5~＜6 | >4~＜5 | >3~＜4 | >2~＜3 | >1~＜2 | |||
| STPG370 | NO.12 Sample | 30 | 28 | 27 | 26 | 24 | 22 | 21 | |
| NO.5 Sample | 25 | 24 | 22 | 20 | 19 | 18 | 16 | ||
| STPG410 | NO.12 Sample | 25 | 24 | 22 | 20 | 19 | 18 | 16 | |
| NO.5 Sample | 20 | 18 | 17 | 16 | 14 | 12 | 11 | ||
2. Chemical Composition of Carbon Steel Tube (Unit: %)
| Grade | C | Si | Mn | P | S |
| STPG370 | ≤ 0.25 | ≤ 0.35 | 0.30-0.90 | ≤ 0.040 | ≤ 0.040 |
| STPG410 | ≤ 0.30 | ≤ 0.35 | 0.30-1.00 | ≤ 0.040 | ≤ 0.040 |
3. Allowable Deviation of Outer Diameter and Wall Thickness of JIS G3454 STPG370 Seamless Pipes
| Type | Allowable Deviation of Outer Diameter | Allowable Deviation of Wall Thickness | ||
| Hot-Working Seamless Steel Tube | ≤ 40A | ± 0.5 mm | < 4 mm | +0.6mm 0.5 |
| ≥ 30A≤ 125A | ± 1% | |||
| 150A | ± 1.6 mm | |||
| ≥ 200A | ± 0.8% | ≥ 4mm | +15%-12.5% | |
| For ≥350A ones, we can measure according to the perimeter. The allowable deviation is ± 0.5%. | ||||
| Cold-Working Seamless Steel Pipe and Electric-Resistance Welded Steel Pipe | ≤ 25A | ± 0.03 mm | < 3 mm ≥ 3 mm | ± 0.3 mm ± 10% |
| ≥ 32A | ± 0.8% | |||
| For ≥350A ones, we can measure according to the perimeter. The allowable deviation is ± 0.5%. | ||||
Note of JIS G3454 STPG370 Seamless Pipes :
1. When we measure the outer diameter through perimeter, we can determine by converting circumference measurement or measured value to be the outer diameter. Both are applicable to the same tolerance (± 0.5%).
2. For the repaired parts, confirm the wall thickness tolerance meet the above table. The outer diameter tolerance is not applicable for the table.
3. The appearance of carbon steel pipes used below 350℃ is regulated by the following provisions:
1) The pipe should be straight with practicality. Its ends must be perpendicular to the tube axis.
2) The inner and outer of tube should be processed well without harmful defects.
Welcome to contact us by email : sales@womicsteel.com
4. Size and Weight of JIS G3454 STPG370 Seamless Pipes
| NominalDiameter | OuterDiameter (mm) |
|
|||||||||||||
| Wall Thickness NO.10 | Wall Thickness NO.20 | Wall Thickness NO.30 | Wall Thickness NO.40 | Wall Thickness NO.60 | Wall Thickness NO.80 | ||||||||||
| A | B | Thickness (mm) | UnitWeight(kg/m) | Thickness (mm) | UnitWeight (kg/m) | Thickness (mm) | UnitWeight(kg/m) | Thickness (mm) | UnitWeight(kg/m) | Thickness (mm) | UnitWeight(kg/m) | Thickness (mm) | UnitWeight(kg/m) | ||
| 6 | 1/3 | 10.5 | 1.7 | 0.369 | 2.2 | 0.450 | 2.4 | 0.479 | |||||||
| 8 | 1/4 | 13.8 | — | — | — | — | — | — | 2.2 | 0.829 | 2.4 | 0.675 | 30. | 0.799 | |
| 10 | 3/8 | 17.3 | 2.3 | 0.851 | 2.8 | 1.00 | 3.2 | 1.11 | |||||||
| 15 | 1/2 | 21.7 | — | — | — | — | — | — | 2.8 | 1.31 | 3.2 | 1.46 | 3.7 | 1.64 | |
| 20 | 3/4 | 27.2 | 2.9 | 1.74 | 3.4 | 2.00 | 3.9 | 2.24 | |||||||
| 25 | 1 | 34.0 | — | — | — | — | — | — | 3.4 | 2.57 | 3.9 | 2.89 | 4.5 | 3.27 | |
| 32 | 11/4 | 42.7 | 3.8 | 3.47 | 4.5 | 4.24 | 4.9 | 4.57 | |||||||
| 40 | 11/2 | 48.6 | — | — | — | — | — | — | 3.7 | 4.10 | 4.5 | 4.89 | 6.0 | 5.47 | |
| 50 | 2 | 60.5 | 3.2 | 4.52 | 3.9 | 5.44 | 4.9 | 6.72 | 6.6 | 7.46 | |||||
| 65 | 21/2 | 76.3 | — | — | 4.5 | 7.97 | — | — | 5.2 | 9.12 | 6.0 | 10.4 | 7.0 | 12.0 | |
| 80 | 3 | 89.1 | 4.5 | 9.39 | 5.5 | 11.3 | 6.6 | 13.4 | 7.6 | 15.3 | |||||
| 90 | 31/2 | 101.6 | — | — | 4.5 | 10.8 | — | — | 5.7 | 13.6 | 7.0 | 16.3 | 8.1 | 18.7 | |
| 100 | 7 | 114.3 | 4.9 | 13.2 | 6.0 | 16.0 | 7.1 | 18.8 | 8.6 | 22.4 | |||||
| 125 | 5 | 139.8 | — | — | 5.1 | 16.9 | — | — | 6.6 | 21.7 | 8.1 | 26.3 | 9.5 | 30.5 | |
| 150 | 6 | 165.2 | 5.5 | 21.7 | 7.1 | 27.7 | 9.3 | 35.8 | 11.0 | 41.8 | |||||
| 200 | 8 | 216.3 | — | — | 6.4 | 33.1 | 7.0 | 36.1 | 8.2 | 42.1 | 10.3 | 52.3 | 12.7 | 63.8 | |
| 250 | 10 | 267.4 | 6.4 | 41.2 | 7.8 | 49.9 | 9.3 | 59.2 | 12.7 | 79.8 | 15.1 | 93.9 | |||
| 300 | 12 | 818.5 | — | — | 6.4 | 49.3 | 8.4 | 64.2 | 10.3 | 78.3 | 14.3 | 107 | 17.4 | 129 | |
| 350 | 11 | 355.6 | 6.4 | 55.1 | 7.9 | 67.7 | 9.5 | 81.1 | 11.1 | 94.3 | 15.1 | 127 | 19.0 | 158 | |
| 400 | 16 | 406.4 | 6.4 | 63.1 | 7.9 | 77.6 | 9.5 | 93.0 | 12.7 | 123 | 16.7 | 160 | 21.4 | 203 | |
| 150 | 18 | 457.2 | 6.4 | 71.1 | 7.9 | 87.5 | 11.1 | 122 | 14.3 | 156 | 19.0 | 205 | 25.8 | 254 | |
| 500 | 20 | 508.0 | 6.4 | 79.2 | 9.5 | 117 | 12.7 | 155 | 15.1 | 184 | 20.6 | 248 | 26.2 | 311 | |
| 550 | 22 | 358.8 | 6.4 | 87.2 | 9.5 | 129 | 12.7 | 171 | 15.9 | 213 | — | — | — | — | |
| 600 | 24 | 609.6 | 6.4 | 92.2 | 9.5 | 141 | 14.3 | 210 | |||||||
| 660 | 26 | 660.4 | 7.9 | 127 | 12.7 | 203 | — | — | — | — | — | — | — | — | |
Dimensions Tolerance of JIS G3454 Carbon Steel Pipes
| Division | Tolerances on outside diameter | Tolerances on wall thickness |
| Hot-finished seamless steel pipe |
40 A or under 【0.5mm | Under 4mm +0.6mm -0.5mm 4mm or over +15% -12.5% |
| 50A or over up to and incl. 125 A 【1% | ||
| 150A 【1.6mm | ||
| 200A or over 【0.8% For the pipe of nominal size 350 A or over, the tolerances on outside diameter may be determined by the measurement of the length of circumference. In this case, the tolerances shall be 【0.5%. |
||
| Cold-finished seamless steel pipe and electric resistance welded steel pipe | 25 A or under 【0.3mm | Under 3mm 【0.3mm 3mm or over 【10% |
| 32 A or over 【0.8% For the pipe of nominal size 350 A or over, the tolerances on outside diameter may be determined by the measurement of the length of circumference. In this case, the tolerances shall be 【0.5%. |
Marking of JIS G3454 STPG370 Seamless Pipes
Each pipe having passed the inspection shall be marked with the following items. However, the smaller pipes or other pipes specified by the purchaser may be bundled together and marked for each bundle by a suitable means. In both cases, the order of arranging the marked items is not specified.
When approved by the purchaser, a part of the items may be omitted.
(1) Letter symbol of grade (STPG 370 )
(2) Letter symbol indicating the manufacturing processes(3)
(3) Dimensions( 4 )
(4) Manufacturer’s name or its identifying brand
(5) Letter symbol denothing the supplementary quality requirement, Z
Note( 3 ) of JIS G3454 STPG370 Seamless Pipes
The letter symbol indicating the manufacturing processes(3) shall be as follows, provided that the dash may be omitted leaving a blank.
Hot-finished seamless steel pipe – S – H
Cold-finished seamless steel pipe- S – C
Electric resistance welded steel pipe other than hot-finished and cold -finished ones – E – G
Hot-finished electric resistance welded steel pipe- E – H
Cold-finished electric resistance welded steel pipe – E – C
Note( 4 ) of JIS G3454 STPG370 Seamless Pipes
The dimensions shall be expressed as follows.
Nominal diameter × Nominal wall thickness
Example: 50A × Sch 40, 2 B × Sch 40
Testings of JIS G3454 STPG370 Seamless Pipes
(1)Chemical analysis
(2)Tensile Test
(3)Flattening Test
(4) Bending Test
(5) Hydrostatic Test or Nondestructive Examination
Welcome to contact us by email : sales@womicsteel.com
JIS G 3454 Carbon Steel Tubes are manufactured in accordance with the Japanese Industrial Standard (JIS) specifications. The mechanical properties of CS JIS G3454 seamless tubes can be significantly modified through heat treatment, allowing them to meet a wide range of engineering requirements.
This specification covers carbon steel tubes for pressure service, commonly used under pressure conditions with a maximum operating temperature of up to 350°C. JIS G3454 tubes are widely applied in automotive components, hydraulic systems, construction machinery, and precision mechanical parts such as cylinders.
Among these grades, JIS G3454 STPG 370 is one of the most commonly used materials for pressure applications. We supply STPG 370, STPG 410, and other grades with various finishing options to meet both performance and appearance requirements across different industries.
As a reliable supplier, Womic Steel maintains a large inventory of JIS G3454 STPG 370 and STPG 410 seamless tubes, ensuring quick delivery and consistent quality for your projects.
Other Ranges of JIS Standards for Womic Steel Pipes
JIS seamless pipes can be manufactured in carbon steel, alloy steel, or stainless steel, depending on application requirements. These JIS standards evaluate material performance such as mechanical strength, hardness, corrosion resistance, pitting resistance, heat treatment response, and other physical properties.
Below is an overview of the main JIS steel pipe standards and their corresponding grades.
JIS G3439 – Seamless Steel Oil Well, Casing, Tubing and Drill Pipe
Steel Grades: STO-G, STO-H, STO-J, STO-N, STO-C, STO-D, STO-E
Application: Seamless oil well casing, tubing, and drill pipe
Industry: Oil & Gas drilling and exploration
JIS G3441 – Alloy Steel Tubes for Machine Structural Purposes
Steel Grades: SCr420TK, SCM415TK, SCM418TK, SCM420TK, SCM430TK, SCM435TK, SCM440TK
Application: Alloy steel tubes used in machinery, automotive parts, mechanical structures
JIS G3444 – Carbon Steel Tubes for General Structural Purposes
Steel Grades: STK30, STK41, STK50, STK51, STK55
Application: General structural supports, frames, construction machinery
Dimension Range: 21.7 mm – 1016.0 mm
JIS G3445 – Carbon Steel Tubes for Machine Structural Purposes
Steel Grades: STKM11A, STKM12A, STKM13A, STKM14A, etc.
Application: Mechanical structures, automotive components, precision machinery
JIS G3455 – Carbon Steel Pipes for High Pressure Service
Steel Grades: STS38, STS42, STS49
Application: High-pressure piping, boilers, hydraulic systems
Dimension Range: 10.5 mm – 660.4 mm
JIS G3456 – Carbon Steel Pipes for High Temperature Service
Steel Grades: STPT38, STPT42, STPT49
Application: High-temperature steam, boilers, superheaters
Dimension Range: 10.5 mm – 660.4 mm
JIS G3460 – Steel Pipes for Low Temperature Service
Steel Grades: STPL39, STPL46, STPL70
Application: Cryogenic service, LNG, low-temperature environments
Dimension Range: 10.5 mm – 660.4 mm
JIS G3464 – Steel Heat Exchanger Tubes for Low Temperature Service
Steel Grades: STBL39, STBL46, STBL70
Application: Low-temperature heat exchangers, condensers
Dimension Range: 15.9 mm – 139.8 mm
JIS G3465 – Seamless Steel Tubes for Drilling
Steel Grades: STM-055, STM-C65, STM-R60, STM-1170, STM-1180, STM-R85
Applications: Drilling pipe, casing, and hollow drill bars
Dimension Range:
Casing: 43 – 142 mm
Hollow Pipes: 34 – 180 mm
Drilling Pipe: 33.5 – 50 mm
JIS G3467 – Steel Tubes for Fired Heater
Steel Grades: STF42, STFAl2, STFA22, STFA23, STFA24, STFA26
Application: Fired heater tubes, refinery furnaces, petrochemical heating systems
Dimension Range: 60.5 mm – 267.4 mm
JIS G3101 – SS400 Hot Rolled Structural Steel
Description:
JIS G3101 SS400 is one of the most widely used hot-rolled structural steels.
It is a Japanese standard carbon steel commonly used for general structural applications, construction, frames, and machinery.
Welcome to contact us by email for more : sales@womicsteel.com
Related Products
-
JIS G3454 STPG 370 Carbon Steel Pipes For Press...
-
DIN 2445-Certified Seamless Steel Tubes Technic...
-
Premium EN 10305 Seamless Steel Tubes | Precisi...
-
DIN 2391 Seamless Precision Tubes Technical Dat...
-
ASTM A335 P91 Type 2 tubes / P5 / P9 / P11 / P1...
-
SA213 T22 Seamless Alloy Steel Tubes / Pipes
-
Copper Pipe, Oxygen-free copper tube (OFC), C10...
-
Casting steel and forged steel products
-
ASME B16.9 A234 WPB Carbon Steel Pipe Elbow