JIS G3455 Carbon Steel High Pressure Pipe

JIS G3455: Carbon Steel Pipes for High Pressure Service

Standard: JIS G3455
JST mainly produce different grades of high pressure steel pipes, such as STS 370, STS 410, STS 480, and so on.

Applications JIS G3455 high pressure carbon steel pipes are extensively raised for high pressure service. Every person typically discovered the piping with high working pressure and with the temperature of below 350℃. This high pressure steel pipe is also applied in boiler, electric power, machinery, gas tank, chemical engineering, construction, shipbuilding, offshore and petroleum engineering, etc.

Size Involving JIS G3455 Carbon Steel Pipe

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

Advantages

JST has individual steelworks for providing pure tube billets for steel pipe processing plants and guaranteeing high quality of of high-pressure carbon steel pipes. The particular control of JST advanced rolling technology, our high-pressure steel pipes own smaller tolerance range than that from other manufacturers.
The micro oxidization and non-oxidation treatment furnace maintains the temperature below 5℃. There isn't any no oxide layer on their own pipe base. This also contributes to high-quality surface, smooth surface and stable performance of carbon steel pipes.
JST also configures a professional physical and chemical testing center with professional testing and technical personnel, and international advanced testing equipment for testing ruthless steel pipes. We possess German full spectrum direct-reading spectrometer, Japan metallurgical microscope, impact testing machine, tensile testing machine, computer controlled electro-hydraulic servo universal testing machine coupled with a variety of machine implements. They can do tensile, flaring, flattening, curling along with other physical tests for the carbon steel pipe if you want to guarantee its stable performance.

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

Parameters of JIS G3455 Carbon Steel Pipe

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
STS370 ≥ 370 ≥ 215 ≥ 30 ≥ 25 ≥ 28 ≥ 23
STS410 ≥ 410 ≥ 245 ≥ 25 ≥ 20 ≥ 24 ≥ 19
STS480 ≥ 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 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
STS370 NO.12 Sample 30 28 27 26 24 22 21
NO.5 Sample 25 24 22 20 19 18 16
STS410, 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 Steel Pipe (Unit: %)

Grade C Si Mn P S
STS370 ≤ 0.25 0.10-0.35 0.30-1.10 ≤ 0.035 ≤ 0.035
STS410 ≤ 0.30 0.10-0.35 0.30-1.40 ≤ 0.035 ≤ 0.035
STS480 ≤ 0.33 0.10-0.35 0.30-1.50 ≤ 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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