JIS G 3119 Manganese-Molybdenum Alloy and Manganese-Molybdenum-Nickel Alloy Steel Plates for Boilers and Other Pressure Vessels – Alloy Steel Plates (SBV1A, SBV1B, SBV2, and SBV3)

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Introduction

JIS G 3119 specifies hot-rolled manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates intended for boilers and pressure vessels operating at intermediate and elevated temperatures. These alloy steel plates are designed to provide suitable strength, heat resistance, and mechanical properties for demanding pressure-containing applications.

Ladhani Metal Corporation supplies alloy steel plates according to customer requirements, with availability depending on grade, dimensions, quantity, and delivery specifications.

Applicable Standard

·        Standard: JIS G 3119:2026

·        Standard title: Manganese-Molybdenum and Manganese-Molybdenum-Nickel Alloy Steel Plates for Boilers and Pressure Vessels

·        Product form: Hot-rolled alloy steel plates

·        Service conditions: Intermediate- and elevated-temperature applications

JIS G 3119:2026 was published on 20 May 2026 and is listed as valid by the Japanese Standards Association.

Material Type

·        Alloy Steel (AS)

·        Manganese-Molybdenum Steel

·        Manganese-Molybdenum-Nickel Steel

·        Boiler Quality Alloy Steel

·        Pressure Vessel Alloy Steel

·        Hot-Rolled Alloy Steel Plate

Scope

JIS G 3119 covers alloy steel plates used in boilers and pressure vessels where strength and material performance at elevated temperatures are important.

Typical applications include:

·        Boiler pressure parts

·        Pressure vessel shells and heads

·        Steam-generating equipment

·        Heat exchangers

·        Industrial process vessels

·        High-temperature pressure-containing equipment

·        Power generation and petrochemical equipment

Steel Grades Covered

The established JIS G 3119 grade designations include SBV1A, SBV1B, SBV2, and SBV3. These grades differ in alloy composition and specified mechanical properties. Confirm the precise grade designation and requirements against the current JIS G 3119:2026 edition when ordering.

Chemical Composition

The chemical composition of JIS G 3119 plates includes controlled amounts of carbon, manganese, molybdenum, and, for nickel-alloyed grades, nickel. The values below are general reference limits from published information for the 2019 edition; the current 2026 edition and the applicable plate thickness must be checked before confirming a specification.

Note: The table is a general guide based on published data for an earlier edition and is not a substitute for the current standard or a certified heat analysis. Other residual and optional alloying-element limits may apply.

Mechanical Properties

Mechanical properties depend on grade, thickness, heat treatment, and the applicable test conditions. The following figures are general reference values published for these grade designations.

The exact acceptance values must be confirmed against JIS G 3119:2026, including the applicable thickness range, specimen type, and heat-treatment condition.

Manufacturing Process

JIS G 3119 alloy steel plates are produced through controlled steelmaking and hot-rolling processes.

Typical manufacturing stages include:

·        Steelmaking and refining

·        Production of killed steel

·        Slab casting

·        Reheating and hot rolling

·        Controlled cooling

·        Heat treatment according to the required grade and plate thickness

·        Plate levelling, dimensional finishing, and preparation for dispatch

Manufacturing Conditions

Manufacturing conditions are selected according to the specified grade, thickness, mechanical properties, and customer requirements.

Common considerations include:

·        Controlled steelmaking and alloy addition

·        Hot rolling to the specified dimensions

·        Heat treatment as required by the standard

·        Dimensional control and surface preparation

·        Compliance with the agreed purchase specification

Heat Treatment

Heat treatment is an important part of producing JIS G 3119 alloy steel plates with the required strength and performance.

Depending on plate thickness and the agreed delivery condition, applicable treatments may include:

·        Normalizing

·        Stress-relief annealing

·        Normalizing followed by stress relief

·        Accelerated cooling followed by tempering where permitted

·        Other conditions specifically agreed between the purchaser and supplier

The exact treatment and designation should be specified in the purchase order and verified against the current standard.

Surface Finish

Available surface finishes may include:

·        Hot-rolled mill finish

·        Descaled surface

·        Shot-blasted surface

·        Pickled surface, where available

·        Primer-coated surface, subject to agreement

Surface preparation depends on plate dimensions, intended application, and customer requirements.

Delivery Condition

Plates can be arranged in suitable delivery conditions according to the applicable specification and order requirements.

·        Normalized condition

·        Stress-relieved condition, where specified

·        Normalized and stress-relieved condition

·        As-rolled condition where permitted by the specification and agreed requirements

·        Cut-to-length plates

·        Customized surface preparation

The required delivery condition must be confirmed before ordering.

Dimensions and Tolerances

JIS G 3119 plates can be sourced according to the required dimensions and applicable standard tolerances.

·        Thickness: as specified by the customer

·        Width and length: according to order requirements

·        Cut-to-size plates: subject to availability and processing feasibility

·        Dimensional tolerances: according to the applicable standard and purchase specification

Pressure Vessel Alloy Steel Characteristics

JIS G 3119 plates are intended for pressure-containing equipment operating under demanding temperature and pressure conditions.

Key characteristics include:

·        Manganese-molybdenum or manganese-molybdenum-nickel alloy composition

·        Specified tensile and yield strength

·        Suitability for elevated-temperature pressure vessel applications

·        Controlled heat-treatment requirements

·        Fabrication and welding suitability when appropriate procedures are followed

·        Availability in different alloy grades for specified service requirements

Forms of Supply

Ladhani Metal Corporation can arrange supply in the following forms, subject to availability:

·        Manganese-molybdenum alloy steel plates

·        Manganese-molybdenum-nickel alloy steel plates

·        Boiler quality alloy steel plates

·        Pressure vessel plates

·        Hot-rolled heavy plates

·        Cut-to-size plates

·        Plates in customized dimensions

Applications

JIS G 3119 alloy steel plates are used in various industrial sectors, including:

·        Boilers and steam-generating equipment

·        Pressure vessels

·        Heat exchangers

·        Power generation plants

·        Petrochemical processing equipment

·        Chemical process vessels

·        Industrial thermal equipment

·        High-temperature pressure-containing structures

Key Features

·        Designed for boiler and pressure vessel applications

·        Manganese-molybdenum and manganese-molybdenum-nickel alloy systems

·        Suitable for specified intermediate- and elevated-temperature services

·        Defined chemical composition and mechanical properties

·        Heat-treatment options according to grade and requirements

·        Available in various plate dimensions, subject to order specifications

·        Suitable for industrial pressure equipment when correctly specified and fabricated

Availability

JIS G 3119 manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates are available on an order basis.

Availability depends on:

·        Required grade

·        Plate thickness, width, and length

·        Order quantity

·        Heat-treatment and delivery conditions

Please confirm the exact grade and applicable JIS G 3119:2026 requirements at the time of enquiry.

Conclusion

JIS G 3119 manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates are used for boilers and pressure vessels requiring specified strength and performance at intermediate and elevated temperatures. Grades such as SBV1A, SBV1B, SBV2, and SBV3 offer different alloy compositions and mechanical-property requirements.

Ladhani Metal Corporation can arrange supply according to the required grade, dimensions, heat-treatment condition, and project specifications.

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

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