JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate
JIS G3115 SPV315 pressure vessel steel detailed specifications: chemical composition, yield strength, tensile, thermal and electrical properties, equivalent standards EN P355GH, ASTM A537, and application guide.
Welding, hot forming, cold forming, cutting, machining
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JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Introduction
JIS G3115 SPV315 is a hot-rolled carbon steel plate for pressure vessels and boilers intended for intermediate temperature service. It offers a minimum yield strength of 315 MPa and tensile strength in the range of 520–655 MPa. Designed under Japanese Industrial Standard JIS G3115, this steel provides excellent weldability, good notch toughness, and reliable performance in moderate-temperature environments up to approximately 450°C. Typical delivery condition is normalized or as-rolled, and the material is widely utilized in the fabrication of steam drums, reactors, heat exchangers, and storage tanks across the power generation, petrochemical, and chemical processing sectors. With controlled chemical composition and proven structural integrity, SPV315 ensures long-term durability and safety in pressurized systems.
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Chemical Composition
The chemical requirements for SPV315 are defined in JIS G3115. The elements shown are the maximum permissible values unless a range is specified. Any intentional additions of niobium, vanadium, titanium or other micro-alloying elements may be agreed upon separately to enhance grain refinement and mechanical properties. Residual elements such as Cr, Ni, Cu and Mo are generally limited and do not exceed 0.30% each, and the total of residual elements is typically restricted to ≤0.50%.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.18 | Max |
| Silicon (Si) | 0.15 – 0.55 | Range |
| Manganese (Mn) | ≤1.50 | Max |
| Phosphorus (P) | ≤0.035 | Max |
| Sulfur (S) | ≤0.035 | Max |
| Residuals (Cr+Ni+Cu+Mo) | ≤0.50 (total) | Typically maximum |
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Thermal and Electrical Physical Properties
The following physical characteristics are typical for SPV315 carbon steel at room temperature unless otherwise stated. These values are not mandatory per JIS G3115 but are representative for engineering calculations. Thermal conductivity decreases with rising temperature, while thermal expansion increases. Electrical resistivity is given for the as-supplied condition.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 210 | GPa | At 20°C |
| Shear Modulus (G) | 81 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.3 | — | At 20°C |
| Thermal Expansion Coefficient (α) | 11.5 | 10⁻⁶/K | 20 – 100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | 20 – 200°C |
| Thermal Expansion Coefficient (α) | 13.5 | 10⁻⁶/K | 20 – 400°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 200°C |
| Thermal Conductivity (λ) | 38 | W/(m·K) | At 400°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρe) | 0.15 | μΩ·m | At 20°C |
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Mechanical Properties
Mechanical properties of SPV315 are determined in accordance with JIS G3115. Yield strength and elongation values depend on plate thickness. Tensile strength remains within a fixed range irrespective of thickness. Bending tests are carried out to assure forming capability. Impact toughness may be specified optionally for low-temperature applications (e.g., Charpy V-notch at 0°C or -10°C), with a commonly required minimum average energy of 27 J. The table below lists the standard requirements.
| Property | Standard Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥315 | MPa | Plate thickness t ≤ 50 mm |
| Yield Strength (ReH) | ≥295 | MPa | 50 mm < t ≤ 100 mm |
| Yield Strength (ReH) | ≥275 | MPa | 100 mm < t ≤ 150 mm |
| Yield Strength (ReH) | ≥255 | MPa | 150 mm < t ≤ 200 mm |
| Tensile Strength (Rm) | 520 – 655 | MPa | All thicknesses |
| Elongation (A) | ≥20 | % | t ≤ 50 mm, gauge length 50 mm (JIS No.5 specimen) |
| Elongation (A) | ≥19 | % | 50 < t ≤ 100 mm, gauge length 50 mm |
| Elongation (A) | ≥18 | % | t > 100 mm, gauge length 50 mm |
| Bend Test (180°) | d = 1.5a | - | t ≤ 25 mm (no cracking) |
| Bend Test (180°) | d = 2.0a | - | 25 < t ≤ 50 mm |
| Bend Test (180°) | d = 2.5a | - | 50 < t ≤ 100 mm |
| Bend Test (180°) | d = 3.0a | - | t > 100 mm |
| Charpy Impact Energy (KV) | ≥27 (if specified) | J | At 0°C or -10°C, upon agreement |
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Directly Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10028-2 | P355GH | Comparable pressure vessel steel for elevated temperatures |
| USA | ASTM A537 / ASME SA537 | Class 1 | Similar yield and tensile range, suitable for moderate temperatures |
| China | GB/T 713 | Q345R | Common pressure vessel steel with matching strength level |
| International | ISO 9328-2 | P355GH | Equivalent to EN grade, widely recognized |
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Application Introduction
SPV315 is engineered for welded pressure vessels and boilers operating at intermediate temperatures (typically up to 450°C). Its balanced strength and toughness make it a preferred choice for components subjected to moderate stress and thermal conditions. The steel can be formed and welded using standard procedures, but post-weld heat treatment (PWHT) may be required depending on thickness and service code. It is extensively employed in the following industries and products.
Product Applications: Steam drums and mud drums, Shell-and-tube heat exchangers, Reactor pressure vessels, Hydrocarbon storage tanks, Distillation column shells
Processed into products: Cylindrical vessel shells, Dished ends and elliptical heads, Tube sheets and baffles, Nozzles and reinforcement pads, Flanges (weld neck, slip-on), Support skirts and saddles
Application industries: Power generation (thermal and nuclear), Petrochemical refineries, Chemical processing plants, Industrial boiler manufacturing, Pressure vessel and heat exchanger fabrication
JIS G3115 SPV315 Pressure Vessel & Boiler Steel Plate Similar or Near-Equivalent Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3115 | SPV355 | Higher yield strength (≥355 MPa) for heavier loading |
| Japan | JIS G3103 | SB450 | Boiler and heat exchanger steel with comparable tensile strength |
| USA | ASTM A516 | Grade 70 | Widely used pressure vessel plate, though yield strength is lower (≥260 MPa) |
| Europe | EN 10028-3 | P355N | Fine-grain steel for pressure vessels with similar mechanicals |
| China | GB/T 713 | Q345R | Already listed as equivalent, also serves as similar alternative |
Notes:
All data are based on JIS G3115 official standard. Specific impact toughness requirements for low-temperature service or supplementary ultrasonic testing can be agreed upon at the time of ordering. The steel is suitable for moderate-temperature service and exhibits good resistance to graphitization. For prolonged exposure above 400°C, creep properties should be evaluated separately. Always refer to the latest edition of the standard for precise material certification.
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