JIS G3115 Specification

Description

JIS G3115 Pressure vessel steel plates

JIS G3115 is a Japanese Industrial Standard (JIS) that specifies steel plates for pressure vessels used at intermediate and high temperatures. This standard covers hot-rolled steel plates designed for welded pressure vessels.

Key Features

• Application: Used in boilers and pressure vessels operating at elevated temperatures.
• Grades: Common steel grades under JIS G3115 include:
  • SPV235 (low strength)
  • SPV315 (medium strength)
  • SPV355 (higher strength)
  • SPV410, SPV450, SPV490 (higher grades with increased strength and heat resistance)
• Manufacturing Process: Hot-rolled
• Properties: Good weldability, high-temperature strength, and resistance to pressure-related stresses.

JIS G3115 Dimensions

• Thickness: 5–300 mm
• Width: 1500–4500 mm
• Length: 3000–18800 mm

JIS G3115 Chemical Composition

Grade	C (Max)	Si	Mn	P (Max)	S (Max)	Mo (Max)	Cu (Max)	Ni (Max)	Cr (Max)
SPV235	0.18	0.15–0.40	0.35–0.90	0.030	0.030	—	0.30	0.30	0.30
SPV315	0.20	0.15–0.40	0.40–1.00	0.030	0.030	—	0.30	0.30	0.30
SPV355	0.20	0.15–0.55	0.40–1.20	0.030	0.030	—	0.30	0.30	0.30
SPV410	0.22	0.15–0.55	0.40–1.40	0.025	0.025	0.35	0.30	0.30	0.30
SPV450	0.23	0.15–0.55	0.60–1.50	0.025	0.025	0.45	0.30	0.30	0.30

JIS G3115 Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
SPV235	≥235	400–510	≥22
SPV315	≥315	490–610	≥21
SPV355	≥355	510–640	≥20
SPV410	≥410	590–720	≥19
SPV450	≥450	620–760	≥18

JIS G3115 Physical Properties

Property	Value
Density (g/cm³)	7.85
Melting Point (°C)	1420–1460
Thermal Conductivity (W/m·K)	45.0
Specific Heat (J/kg·K)	480
Electrical Resistivity (Ω·m)	1.59 × 10⁻⁷

Application

• Pressure Vessels – Used in manufacturing boilers, storage tanks, and pressure vessels for high-temperature environments.
• Heat Exchangers – Suitable for heat exchangers in power plants and chemical industries.
• Oil & Gas Industry – Used in refining equipment, gas processing plants, and petrochemical applications.
• Steam Boilers – Ideal for fabricating steam boilers due to its heat-resistant properties.
• Chemical Processing Plants – Applied in reactors, distillation towers, and chemical storage tanks.
• Power Plants – Utilized in high-temperature and high-pressure applications such as boiler drums and piping systems.