JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers
JIS G3115 SPV235 Pressure Vessel & Boiler Steel Plate - Composition, Properties & Equivalents
Complete material data for SPV235 steel plate under JIS G3115. Chemical composition, mechanical & thermal properties, equivalent grades, applications and processing guide for pressure vessel and boiler fabrication.
Welding, hot forming, cold forming, machining, bending, edge preparation
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JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Introduction
SPV235 is a carbon steel plate for pressure vessels and boilers specified in Japanese Industrial Standard JIS G3115. It offers a minimum yield strength of 235 MPa at room temperature and good weldability, making it suitable for moderate-temperature and moderate-pressure equipment. The steel is delivered in normalized or as-rolled condition, with controlled sulfur and phosphorus for improved toughness and formability. Typical applications include storage tanks, boiler shells, and heat exchanger components.
- Minimum yield strength: 235 MPa
- Tensile strength: 400–510 MPa
- Good weldability and notch toughness
- Compatible with international equivalents like P235GH, SA285 Gr.C, Q245R
JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Chemical Composition
Chemical composition limits for SPV235 according to JIS G3115. Elements are controlled for good weldability and toughness. Phosphorus and sulfur are kept low to avoid hot shortness and improve ductility. Residual elements such as chromium, nickel, and copper may be present but are not specified individually unless required for supplementary requirements.
- Carbon equivalent (CE) is typically below 0.40% for good weldability.
- Fine grain practice may be applied (Al ≥0.015%) to improve toughness.
| Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.18 | Thickness ≤50 mm |
| Silicon (Si) | ≤0.35 | Also applies to t ≤125 mm |
| Manganese (Mn) | 0.40–1.20 | Higher Mn improves strength and hardenability |
| Phosphorus (P) | ≤0.030 | Controlled for toughness |
| Sulfur (S) | ≤0.030 | Low S ensures good quality |
JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Thermal and Electrical Physical Properties
The following physical properties are typical for carbon steel grades similar to SPV235. They are not specified in JIS G3115 but are provided for engineering design purposes. Values are valid for room temperature unless otherwise noted. Properties may vary with actual composition and heat treatment.
- Density: 7850 kg/m³
- Young's modulus: 205 GPa at 20°C
- Thermal conductivity ~51 W/m·K at 20°C
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 205 | GPa | 20°C, tensile |
| Shear Modulus (G) | 79.3 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | — | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 | 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 | 20–300°C |
| Thermal Conductivity (λ) | 51.0 | W/(m·K) | 20°C |
| Thermal Conductivity (λ) | 49.0 | W/(m·K) | 200°C |
| Specific Heat Capacity (c_p) | 486 | J/(kg·K) | 20°C |
| Specific Heat Capacity (c_p) | 519 | J/(kg·K) | 100°C |
| Electrical Resistivity (ρ_e) | 0.16 | µΩ·m | 20°C |
JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Mechanical Properties
Mechanical properties are based on JIS G3115 requirements. Yield strength, tensile strength, and elongation depend on plate thickness. Impact test is optional and required only when specified by the purchaser. The standard reference test piece is JIS Z 2241 No.5 (gauge length 50 mm).
- For thicknesses over 200 mm, properties should be agreed between manufacturer and purchaser.
- Bend test: specimen bent through 180° without cracks (bend radius = 1.5 × plate thickness up to 25 mm).
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥235 | MPa | Plate thickness t ≤ 50 mm |
| Yield Strength (ReH) | ≥215 | MPa | 50 < t ≤ 200 mm |
| Tensile Strength (Rm) | 400–510 | MPa | Plate thickness up to 200 mm |
| Elongation (A) | ≥23 | % | t ≤ 25 mm, JIS No.5 test piece, longitudinal |
| Elongation (A) | ≥18 | % | 25 < t ≤ 50 mm, JIS No.5 test piece, longitudinal |
| Elongation (A) | ≥22 | % | 50 < t ≤ 200 mm, JIS No.5 test piece, transverse (agreed) |
| Bend Test | D=1.5a (t≤25 mm) | — | 180° bend, no crack; D=mandrel diameter, a=thickness |
| Bend Test | D=2.0a (25| — | For higher thickness bend radius may be increased | |
| Impact Energy (KV₂, 0°C) | ≥27 | J | When required, average of 3 specimens; min individual 21 J |
| Impact Energy (KV₂, -10°C) | ≥27 | J | Optional low-temperature requirement (by agreement) |
JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Completely Equivalent Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe/International | EN 10028-2 / ISO 9328-2 | P235GH | Pressure vessel steel, equivalent high-temperature properties |
| USA | ASTM A285 / ASME SA285 | Grade C | Carbon steel pressure vessel plates, similar strength and composition |
| China | GB/T 713 | Q245R | Boiler and pressure vessel steel, formerly 20g |
| India | IS 2002 | Gr. 1 / 2 | Boiler quality steel, comparable yield strength |
JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Application Introduction
SPV235 is a versatile carbon steel for welded pressure vessels and boilers operating at moderate temperatures (
- Maximum design temperature typically 400°C under creep consideration
- Excellent formability for dished heads and cylindrical shells
- Requires post-weld heat treatment (PWHT) for thick sections as per applicable codes
Product Applications: Boiler drums and shells, Pressure vessel bodies (horizontal/vertical), Heat exchanger shells and channel barrels, Storage tanks for LPG, ammonia, or industrial gases (low-temperature limits apply), Air receivers and separators, Expansion vessels and accumulators
Processed into products: Dished heads (elliptical, torispherical, hemispherical), Welded cylindrical shells and conical sections, Tube sheets (for heat exchangers), Nozzle reinforcements and flanges, Skirt supports and lugs, Baffle plates and support plates, Manway covers and blind flanges
Application industries: Oil & Gas (storage, separation vessels), Chemical and Petrochemical (reactors, columns, heat exchangers), Power Generation (boiler drums, economizers, steam receivers), Water Treatment (pressure filters, softeners), Shipbuilding (auxiliary pressure tanks), Construction (air receivers, compressed air vessels)
JIS G3115 SPV235 Steel Plate for Pressure Vessels and Boilers Similar / Near-Equivalent Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3103 | SB410 | Boiler and heat exchanger carbon steel, slightly different strength range |
| Japan | JIS G3106 | SM400A/B/C | Structural steel, weldable, yield ≥235 MPa; not specifically for pressure vessels |
| Japan | JIS G3115 | SPV315, SPV355 | Higher strength grades within same standard; SPV315 (355 MPa TS) and SPV355 (490-610 MPa TS) |
| China | GB/T 713 | Q345R | Higher strength pressure vessel steel, yield ≥345 MPa, better for heavier designs |
| Europe | EN 10028-2 | P265GH | Slightly higher temperature/pressure capability (yield 265 MPa) |
Notes:
- Welding consumables should match the base metal strength (e.g., E6010/E7018 for SMAW, ER70S-6 for GMAW). Preheating is recommended for thicknesses over 30 mm or when carbon equivalent exceeds 0.40%.
- Post-weld heat treatment (PWHT) temperature: typically 600–640°C, holding time 1 hour per 25 mm of thickness, followed by slow cooling.
- For sour service (H₂S-containing environments), supplementary requirements for HIC resistance may be agreed (JIS G3115 does not cover HIC testing).
- Ultrasonic testing (UT) of plates is often required per JIS G0801 or EN 10160 for pressure vessel integrity.
- SPV235 is not intended for low-temperature service below -10°C unless specifically tested; for lower temperatures, consider JIS G3126 SLA series or fine-grain impact-tested grades.
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