JIS G3454 Carbon Steel Pipes for Pressure Service

JIS G3454: Carbon Steel Pipes for Pressure Service

Standard: JIS G3454
JST mainly produces different grades of carbon steel tubes, such as STPG 370 and STPG 410.

Applications JIS G3454 carbon steel pipe is commonly used for pressure service, high-pressure service and high temperature platform. It is typically used from the pressure piping with the temperature of below 350℃. This carbon steel tube is also applied in boiler, electric power, machinery, gas tank, chemical engineering, offshore and petroleum engineering, etc.

  • Size Involving JIS G3454 Carbon Steel Pipe
  • Outer dimensions come from 19.05 mm to 114.3 mm.
  • Wall thickness ranges from some.0 mm to 14 mm.
  • Optimum length of that carbon steel tube is 16000 millimeter.

Advantages of JIS G3454 Carbon Steel Pipe

Underneath the control of advanced rolling technology, JST can control the size tolerance within the limits prescribed in the standard, or can even reduce the tolerance wide variety. Our company additionally be able offer other sizes of carbon steel tubes according to customers' requirement.
JIS G3454 carbon steel pipe enters the micro oxidation and non-oxidation heat treatment furnace that can make the pipe surface reach the non-oxidation state after thermal treatment. This furnace may make the pipe surface smooth and extend its service your life.
We configure Siemens electronic controlled six roller straightening machine for straightening carbon steel tubes after cooled goose down. This can make sure the straightness of carbon steel pipes meet the requirements of standards and customers.
JST provides UNICORN ultrasonic joint inspection machine, ultrasonic testing machine, hydrostatic press and magnetic flux leakage testing machine. Primarily based the requirements of standards and customers, we do transverse and longitudinal defect online inspection for the body and end of carbon steel tubes, in order to provide high quality carbon steel pipes can be.

PackagingWe package our products in bare, bundles, crates or crate protection at the both sides of pipes. We can also package products as per customers' laws.

Specifications of JIS G3454 Carbon Steel Tube

1. Mechanical Properties

Grade Tensile Property (N/mm2) Yield Point or Yield Strength (N/mm2) Elongation (%)
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:
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 to the carbon steel tubes with the nominal pipe diameter of equal to 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 Elongation differs according to the wall thickness. (%)
>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

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:
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 meets the above table. The outer diameter tolerance is not applicable to the table.
3. The appearance of carbon steel pipes used below 350℃ is regulated by the following provisions:
1) The carbon steel tube 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.
4. Size and Weight of Carbon Steel Pipe

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