JIS G 3455 specifies carbon steel pipes for high-pressure service at temperatures of 350°C or lower.
Referenced Edition: JIS G 3455:2024
Standard Title: Carbon Steel Pipes for High Pressure Service
The standard generally covers outside diameters from 10.5 to 660.4 mm.
JIS G3455 is intended specifically for high-pressure piping. It should be distinguished from JIS G3454 for pressure service and JIS G3456 for high-temperature service.
| Dimension | Standard Scope |
|---|---|
| Outside Diameter | 10.5–660.4 mm |
| Nominal Size | Approximately 6A / 1/8B through 650A / 26B |
| Common Ordering Format | Nominal Diameter + Schedule |
| Alternative Ordering Format | Outside Diameter + Wall Thickness |
Dimensions outside the standard dimensional series may require agreement between the purchaser and manufacturer.
The standard dimensional scope and FYN’s manufacturing capability are stated separately. Available production sizes are shown in the Manufacturing Capability section.
JIS G3455 specifies three grades with progressively higher minimum tensile-strength levels.
| Grade | Minimum Tensile Strength | Minimum Yield Point / Proof Stress |
|---|---|---|
| STS370 | 370 MPa | 215 MPa |
| STS410 | 410 MPa | 245 MPa |
| STS480 | 480 MPa | 275 MPa |
Elongation requirements depend on the test-piece type, orientation, and pipe wall thickness. For thinner-wall pipes, applicable adjusted elongation requirements should be verified according to JIS G3455.
| Grade | Selection Considerations |
|---|---|
| STS370 | The lowest-strength grade within JIS G3455. Selected where the piping design specifies the STS370 strength level. |
| STS410 | Provides higher tensile and yield strength than STS370. Selected where the piping design or material specification requires STS410. |
| STS480 | The highest-strength grade among the three. Selected according to piping design, fabrication requirements, and the applicable material specification. |
Material selection should follow the piping design requirements. The highest-strength grade should not be selected automatically.
| Element | STS370 | STS410 | STS480 |
|---|---|---|---|
| Carbon (C) | ≤0.25% | ≤0.30% | ≤0.33% |
| Silicon (Si) | 0.10–0.35% | 0.10–0.35% | 0.10–0.35% |
| Manganese (Mn) | 0.30–1.10% | 0.30–1.40% | 0.30–1.50% |
| Phosphorus (P) | ≤0.035% | ≤0.035% | ≤0.035% |
| Sulfur (S) | ≤0.035% | ≤0.035% | ≤0.035% |
Other alloying elements may be added where permitted by the standard. Intentionally added elements are subject to applicable reporting requirements.
Heat-treatment requirements depend on the grade and manufacturing condition.
| Grade | Hot-Finished Seamless Pipe | Cold-Finished Seamless Pipe |
|---|---|---|
| STS370 / STS410 | As manufactured; low-temperature annealing or normalizing may be applied where necessary | Low-temperature annealed or normalized |
| STS480 | Low-temperature annealed or normalized | Low-temperature annealed or normalized |
Additional project-specific heat-treatment requirements should be identified at the enquiry stage.
JIS G3455 pipes are subject to applicable material, mechanical, dimensional, and integrity verification.
| Inspection Area | Applicable Verification |
|---|---|
| Chemical Composition | Chemical analysis |
| Mechanical Properties | Tensile testing |
| Forming Performance | Flattening testing |
| Dimensions | Dimensional inspection and wall-thickness measurement |
| Surface Condition | Surface inspection |
| Pipe Integrity | Hydrostatic testing or nondestructive examination |
| Identification | Material identification |
| Final Review | Final inspection and documentation |
Additional purchaser-specified inspection requirements should be stated at the RFQ stage.
Depending on the ordered specification, applicable integrity testing can include:
The required test method and any additional acceptance criteria should be identified in the purchase specification.
Both standards cover carbon steel pressure piping at temperatures up to approximately 350°C, but their intended pressure-service categories differ.
| Standard | Intended Service | Grades |
|---|---|---|
| JIS G3454 | Carbon Steel Pipes for Pressure Service | STPG370 / STPG410 |
| JIS G3455 | Carbon Steel Pipes for High-Pressure Service | STS370 / STS410 / STS480 |
JIS G3455 includes the additional higher-strength STS480 grade and is intended specifically for high-pressure piping service.
The correct standard should be selected according to the piping design and project specification, rather than operating temperature alone.
| Standard | Service Classification |
|---|---|
| JIS G3455 | High-pressure service at temperatures ≤350°C |
| JIS G3456 | High-temperature service |
For piping operating above the JIS G3455 temperature scope, JIS G3456 or another applicable high-temperature material specification should be reviewed.
Material selection should consider design pressure, design temperature, service medium, and the applicable piping code.
| Parameter | FYN Capability |
|---|---|
| Product Form | Seamless Carbon Steel Pipe |
| Grades | STS370 / STS410 / STS480 |
| Manufacturing Process | Cold Drawn / Cold Rolled |
| Outside Diameter | 10.5–114 mm within the JIS G3455 standard scope |
| Wall Thickness | 0.8–25 mm, subject to JIS G3455 dimensional and technical requirements |
| Length | Up to 40 m |
| Inspection | Hydrostatic / UT / ET, as specified |
| Documentation | MTC / Inspection Documentation / Third-Party Inspection, as required |
Available combinations of outside diameter, wall thickness, and length are subject to technical review.
For industrial process lines where STS370, STS410, or STS480 is specified by the piping material specification.
For applicable high-pressure water, steam, and auxiliary piping systems operating within the JIS G3455 material scope.
For pressure piping associated with boiler and steam systems where JIS G3455 is specified by the equipment or piping design.
For high-pressure process piping carrying compatible liquids, gases, or process media.
For high-pressure utility piping in manufacturing plants and industrial facilities.
For maintenance and replacement projects where existing piping documentation specifies JIS G3455 STS370, STS410, or STS480.
Material suitability must be evaluated together with design pressure, design temperature, process medium, corrosion allowance, and the applicable piping design code.
Available documentation can include:
Required documentation should be specified at the RFQ stage.
Typical packing options include:
End preparation can be reviewed according to piping fabrication requirements. Long-length pipes may require special packing and transportation arrangements.
| Item | Details |
|---|---|
| Custom Sizes | Subject to grade and technical review |
| Minimum Order Quantity | According to grade, dimensions, and production requirements |
| Lead Time | According to grade, dimensions, quantity, heat treatment, and inspection requirements |
| End Preparation | According to piping fabrication requirements |
| Special Packing | According to project and transport requirements |
| Item | Information to Provide |
|---|---|
| Standard | JIS G 3455 and required edition, if specified |
| Grade | STS370 / STS410 / STS480 |
| Pipe Size | Nominal Size / Outside Diameter |
| Wall Thickness | Wall Thickness / Schedule |
| Length | Required pipe length |
| Quantity | Required order quantity |
| Manufacturing Condition | Hot-finished / Cold-finished requirement, if specified |
| Heat Treatment | Required treatment or delivery condition |
| Design Conditions | Design pressure, design temperature, and service medium |
| Testing | Hydrostatic / NDT requirements |
| End Preparation | Required pipe-end condition |
| Surface Condition | Project-specific surface requirements |
| Dimensional Tolerances | Specific tolerances, if required |
| Documentation | Required inspection documents |
| Third-Party Inspection | Required scope, if applicable |
| Delivery | Destination |
For high-pressure piping projects, send your piping specification, material take-off (MTO), or technical drawing for review.
Please send your requirements in the following format:
JIS G 3455 + Grade + Nominal Size / OD + Wall Thickness / Schedule + Length + Quantity
Available Grades: STS370 / STS410 / STS480
For high-pressure piping projects, also include:
Design Pressure + Design Temperature + Service Medium + NDT Requirements + Inspection Documentation Requirements
For replacement projects, provide an existing MTC or piping specification to help verify the original material requirements.
