GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Material
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes
Technical data for GB/T 5312 grade 410I, 410II, 410III carbon steel seamless tubes for ship and vessel piping, covering composition, mechanical properties and applications.
Hot-finished or cold-finished with subsequent normalizing; cold-drawn tubes may be stress-relieved
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GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Introduction
GB/T 5312 410I, 410II, 410III are carbon steel seamless tubes specifically designed for ship and vessel piping systems. The material belongs to the 410 strength class and is differentiated by the required impact test temperature:
- 410I – impact test at 0°C
- 410II – impact test at -20°C
- 410III – impact test at -40°C
All three grades share the same chemical composition and basic tensile properties, ensuring a minimum yield strength of 235 MPa and tensile strength between 410 and 530 MPa. The tubes are delivered in normalized condition, offering good weldability and toughness for shipbuilding environments. Typical applications include fuel oil lines, steam pipes, freshwater systems and other pressure circuits on vessels. The standard is harmonized with ISO 9329-2, where the equivalent designation is PH410 with corresponding temperature suffixes.
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Chemical Composition
Chemical requirements according to GB/T 5312-2009, ladle analysis. The same composition applies to all three grades 410I, 410II and 410III. Residual elements are restricted to maintain weldability and toughness.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| C | ≤0.21 | |
| Si | ≤0.35 | |
| Mn | 0.40 – 1.20 | |
| P | ≤0.035 | |
| S | ≤0.035 | |
| Cr | ≤0.25 | |
| Ni | ≤0.30 | |
| Mo | ≤0.10 | |
| Cu | ≤0.30 |
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Thermal and Electrical Physical Properties
The standard GB/T 5312 does not specify thermal or electrical physical properties for grade 410. The following values are typical for carbon steel with similar composition and may be used for engineering estimates but are not part of the normative requirements.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Mechanical Properties
Mechanical property requirements for GB/T 5312 grade 410 tubes at room temperature in the normalized condition. The impact test temperature differentiates the three sub-grades: 410I (0°C), 410II (-20°C) and 410III (-40°C). Unless otherwise specified, tests are performed on longitudinal specimens.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Tensile strength (Rm) | 410 – 530 | MPa | Room temperature |
| Upper yield strength (ReH) | ≥235 | MPa | Room temperature |
| Elongation after fracture (A), longitudinal | ≥22 | % | Gauge length 5.65√So |
| Elongation after fracture (A), transverse | ≥20 | % | Gauge length 5.65√So |
| Impact energy (KV2), average of 3 specimens | ≥27 | J | 410I: 0°C; 410II: -20°C; 410III: -40°C |
| Impact energy (KV2), individual minimum | ≥20 | J | Same temperatures as above |
| Bend test (mandrel diameter) for wall thickness S ≤22 mm | 3×S | mm | Bending angle 180° |
| Bend test (mandrel diameter) for wall thickness S >22 mm | 4×S | mm | Bending angle 180° |
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Fully Equivalent Material Standards and Alternative Designations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 9329-2 | PH410 (with suffix for impact temperature, e.g. PH410-0, PH410-20, PH410-40) | Chemical composition and mechanical properties align with GB/T 5312 410I/II/III. |
| China | CCS (China Classification Society) Rules | 410 (grade I, II, III per GB/T 5312) | Recognized by CCS for marine piping. |
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Application Introduction
GB/T 5312 410I/II/III seamless tubes are widely used in shipbuilding for pressure parts. The selection of the impact test temperature (I, II or III) depends on the design temperature and location of the piping system. 410III is recommended for low-temperature service and for systems exposed to cold environments. The material can be processed by hot bending, cold bending, welding and machining into various piping components. Normalized delivery ensures homogeneous structure and good toughness.
Product Applications: Marine fuel oil piping systems, Lubricating oil lines, Steam and condensate piping, Compressed air and service water pipelines, Hydraulic and ballast water systems
Processed into products: Pipe sections and pieces, Bends and elbows (hot or cold formed), Tees and reducers, Flanges and branch connections, Prefabricated spools and pipe supports
Application industries: Shipbuilding and ship repair, Marine engineering, Offshore platform construction, Pressure vessel manufacturing for marine use
GB/T 5312 Grade 410I/410II/410III Shipbuilding Carbon Steel Seamless Tubes Similar or Comparable Alternative Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A106 | Grade B | Tensile strength ≥415 MPa, Yield ≥240 MPa; carbon content up to 0.30% may limit weldability compared to 410. |
| EU | EN 10216-2 | P235GH | Similar yield strength (235 MPa) but lower tensile range (360–500 MPa); suitable for pressure purposes. |
| Japan | JIS G3456 | STPG410 | Tensile 410–550 MPa, Yield ≥245 MPa; sometimes used for similar temperature applications. |
Notes:
The impact test requirements must be verified for the actual wall thickness, especially for thick-walled tubes. For applications requiring certified through-thickness properties or additional non-destructive testing, supplementary requirements according to GB/T 5312 Annex or relevant classification society rules should be specified in the order.
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