JIS G 3115 Steel Plates for Pressure Vessels for Intermediate Temperature Service – MS / CS Steel

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Introduction

JIS G 3115 specifies hot-rolled steel plates with improved weldability for pressure vessels and high-pressure equipment intended for intermediate-temperature service. The standard covers carbon and alloying-controlled pressure vessel steels designed to provide suitable strength, toughness and fabrication performance.

Ladhani Metal Corporation supplies JIS G 3115 pressure vessel steel plates in various grades, thicknesses and delivery conditions on an order basis.

Applicable Standard

JIS G 3115:2022 – Steel plates for pressure vessels for intermediate temperature service.

The standard specifies requirements for hot-rolled steel plates intended for pressure vessels and high-pressure equipment, excluding equipment specifically designed for high- or low-temperature service.

Material Type

JIS G 3115 steel plates are classified as:

·        Carbon Steel (CS)

·        Mild Steel (MS)

·        Pressure Vessel Steel

·        Boiler and Pressure Equipment Steel

·        Weldable Structural Steel

·        High-Strength Pressure Vessel Steel

These materials are selected for pressure-containing applications where weldability, mechanical strength and service-temperature requirements are important.

Scope

JIS G 3115 covers hot-rolled steel plates with improved weldability for pressure vessel and high-pressure equipment applications.

Typical product applications include:

·        Pressure vessel plates

·        Industrial boiler components

·        Process equipment

·        Heat exchangers

·        Storage vessels

·        High-pressure equipment

·        Chemical processing equipment

·        Petrochemical equipment

The applicable grade and delivery condition should be selected according to the design code, operating temperature, pressure and plate thickness.

Chemical Composition

Chemical composition varies by grade, plate thickness and manufacturing requirements. The following table summarizes the principal limits for the commonly specified grades.

*For SPV235, the permitted carbon limit can vary with thickness. Additional alloying elements may be used where allowed by the standard. The complete composition requirements should be verified against JIS G 3115:2022 for the ordered grade and thickness.

Mechanical Properties

Mechanical properties depend on grade, plate thickness, test-piece requirements and delivery condition. The following values provide a general reference for the principal strength grades.

Yield strength requirements generally decrease as plate thickness increases. The exact values must be checked against the applicable grade, thickness and delivery condition before ordering or design use.

Manufacturing Process

JIS G 3115 pressure vessel plates are manufactured using controlled steelmaking and hot-rolling processes.

Common manufacturing steps include:

·        Steelmaking and chemical composition control

·        Continuous casting or ingot casting

·        Slab preparation and reheating

·        Hot rolling

·        Controlled rolling where applicable

·        Controlled cooling

·        Heat treatment according to grade

·        Straightening and dimensional finishing

·        Cutting to the required dimensions

The manufacturing route is selected according to the required strength, toughness, weldability and plate thickness.

Manufacturing Conditions

JIS G 3115 plates may be supplied in suitable manufacturing conditions according to grade and order requirements.

Typical conditions include:

·        As rolled

·        Normalized

·        Thermomechanically controlled processed (TMCP), where applicable

·        Quenched and tempered, where applicable

·        Other specified conditions agreed for the grade and application

The permitted condition depends on the grade and requirements of JIS G 3115:2022.

Heat Treatment

Heat treatment is selected according to the specified grade, thickness and required mechanical properties.

Common conditions include:

·        As-rolled condition

·        Normalizing

·        Quenching and tempering, where specified

·        Thermomechanical controlled processing, where applicable

·        Stress relieving where required by the design or fabrication procedure

The final heat-treatment condition should be confirmed at the time of order.

Surface Finish

JIS G 3115 steel plates can be supplied with different surface finishes according to customer requirements.

Common options include:

·        Hot-rolled mill finish

·        Descaled finish

·        Shot-blasted finish

·        Pickled finish

·        Pickled and oiled finish, where suitable

·        Primer-coated finish

·        Customized surface preparation

Surface preparation should be selected according to storage, fabrication, coating and service requirements.

Delivery Condition

JIS G 3115 steel plates can be supplied in delivery conditions suitable for pressure vessel fabrication.

Typical options include:

·        As rolled

·        Normalized

·        Quenched and tempered, where specified

·        TMCP condition, where applicable

·        Stress-relieved condition where agreed

·        Descaled

·        Shot blasted

·        Cut-to-length

·        Customized delivery condition

The specified grade and delivery condition should be stated clearly in the purchase order.

Dimensions and Tolerances

JIS G 3115 steel plates are supplied according to the dimensional and tolerance requirements applicable to the specified product.

Available dimensions can include:

·        Standard plate thicknesses

·        Custom thicknesses

·        Standard widths

·        Custom widths

·        Standard lengths

·        Cut-to-length plates

·        Heavy pressure vessel plates

·        Customized plate dimensions

Actual dimensional availability depends on grade, manufacturing route, plate thickness and order quantity.

Pressure Vessel Steel Characteristics

JIS G 3115 steels are designed to provide:

·        Improved weldability

·        Suitable tensile and yield strength

·        Pressure-containing capability when used in an appropriately designed vessel

·        Controlled chemical composition

·        Suitable toughness according to grade requirements

·        Multiple strength levels

·        Compatibility with pressure vessel fabrication processes

·        Availability in different heat-treatment conditions

Material selection must account for the vessel design code, operating conditions, thickness and required mechanical properties.

Forms of Supply

Ladhani Metal Corporation can supply JIS G 3115 materials in the following forms, subject to availability:

·        Pressure vessel steel plates

·        Boiler steel plates

·        Hot-rolled steel plates

·        Carbon steel plates

·        High-strength pressure vessel plates

·        Heavy plates

·        Cut-to-size plates

·        Custom dimensions

Applications

JIS G 3115 pressure vessel steel plates are used in:

·        Pressure vessels

·        Industrial boilers and associated equipment, where the selected grade is suitable

·        Heat exchangers

·        Chemical processing equipment

·        Petrochemical processing units

·        Industrial process vessels

·        High-pressure equipment

·        Storage vessels

·        Fabricated pressure-containing components

·        General industrial pressure equipment

The selected material must meet the design code and operating requirements for the intended service.

Key Features

·        JIS G 3115:2022 specification

·        Carbon steel and pressure vessel steel plate grades

·        Six principal SPV grades

·        Improved weldability

·        Multiple strength levels

·        Controlled chemical composition

·        Hot-rolled plate supply

·        Various heat-treatment conditions, depending on grade

·        Suitable for pressure vessel fabrication

·        Custom dimensions available on order

Availability

JIS G 3115 steel plates are available on order basis from Ladhani Metal Corporation.

Availability depends on:

·        Required grade

·        Plate thickness

·        Width and length

·        Delivery condition

·        Heat-treatment requirements

·        Quantity

·        Inspection and documentation requirements

Conclusion

JIS G 3115 specifies hot-rolled steel plates for pressure vessels and high-pressure equipment intended for intermediate-temperature service. Its SPV grades provide different strength levels and weldability characteristics for pressure vessel fabrication.

Ladhani Metal Corporation supplies JIS G 3115 steel plates in required grades, dimensions and delivery conditions on an order basis.

To place an order or enquiry, contact Ladhani Metal Corporation.

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