JIS G3456 Carbon Steel Pipes

JIS G3456: Carbon Steel Pipes for High Temperature Service

Standard: JIS G3456
We mainly supply various grades of high pressure steel pipes, such as STPT 370, STPT 410 and STPT 480.

Applications JIS G3456 high-pressure carbon steel pipes are extensively used for pressure service, high pressure service and high temperature software. They are typically used your past piping higher working pressure and an issue temperature of below 350℃. This high pressure steel pipe is also utilized in boiler, electric power, machinery, gas tank, chemical engineering, offshore and petroleum engineering, etc.

Size Associated with JIS G3456 Carbon Steel Pipe

Outer dimension is from 19.05 mm to 114.3 mm.
Wall thickness on this high pressure steel pipe ranges from 2.0 mm to 14 mm.
The length is 16000 millimeters.

Competitive Advantages

JST has three sets of advanced hydrostatic press to check on the compactness of steel pipes. Common actions like judge whether there exists leakage phenomenon of this carbon steel pipe through naked eyes or pressure drop. The maximum test pressure reaches 120Mpa, which meets the requirements of questionable steel pipes.
Similar to provide ultrasonic flaw detection test or eddy current inspection, as well as provide relevant inspection documents.
JST can also do nondestructive inspection for G3456 carbon steel water lines. We will get rid of disqualified high-pressure steel pipes and ensure that we manage to supply boiler, superheater and heat-exchanger pipes with stable performance and quality.
For the surface defects, JST professional inspection personnel will do polishing, removal, repair nicely series of processes based on their specific characteristics. These processes are carried out in accordance with specifications. After treatment, inspectors will instigate a second inspection for carbon steel pipes. They also measure the wall thickness of high pressure steel pipes and make their performance more ferme.

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

Specifications of G3456 Carbon Steel Pipe

1. Mechanical Properties of High Pressure Steel Pipe

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
STPT370 ≥ 370 ≥ 215 ≥ 30 ≥ 25 ≥ 28 ≥ 23
STPT410 ≥ 410 ≥ 245 ≥ 25 ≥ 20 ≥ 24 ≥ 19
STPT480 ≥ 480 ≥ 275 ≥ 25 ≥ 20 ≥ 22 ≥ 17

Note:
1. For the high pressure 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 pipes with the outer diameter of equal or less than 40 mm. 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 high pressure 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
STPT370 NO.12 Sample 30 28 27 26 24 22 21
NO.5 Sample 25 24 22 20 19 18 16
STPT410, 480 NO.12 Sample 25 24 22 20 19 18 16
NO.5 Sample 20 18 17 16 14 12 11

2. Chemical Composition of High Pressure Carbon Steel Pipe (Unit: %)

Grade C Si Mn P S
STPT370 ≤ 0.25 0.10-0.35 0.30-0.90 ≤ 0.035 ≤ 0.035
STPT410 ≤ 0.30 0.10-0.35 0.30-1.00 ≤ 0.035 ≤ 0.035
STPT480 ≤ 0.33 0.10-0.35 0.30-1.00 ≤ 0.035 ≤ 0.035

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 ＜50 mm ± 0.5 mm ＜ 4 mm ≥ 4mm ± 0.5 mm ±12.5% ≤ 20% of thickness
≥ 50mm~＜160mm ± 1%
≥ 160mm~≤ 200 mm ± 1.6 mm
≥ 200 mm ± 0.8%
For ≥350 mm 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 ≤ 40 mm ± 0.03 mm ＜ 2 mm ≥ 2 mm ± 0.2 mm ± 10% -

 

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