JIS G 3120 Manganese-Molybdenum and Manganese-Molybdenum-Nickel Alloy Steel Plates Quenched and Tempered for Pressure Vessels – Alloy Steel Plates

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Introduction

JIS G 3120 specifies quenched and tempered manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for nuclear reactors and other pressure vessels. These plates are designed for demanding pressure-containing applications where high strength, toughness, and reliable mechanical performance are required.

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

Applicable Standard

·        Standard: JIS G 3120:2022

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

·        Product form: Quenched and tempered alloy steel plates

·        Intended applications: Nuclear reactors and other pressure vessels

JIS G 3120:2022 is the current edition listed by the Japanese Standards Association.

Material Type

·        Alloy Steel (AS)

·        Manganese-Molybdenum Steel

·        Manganese-Molybdenum-Nickel Steel

·        Quenched and Tempered Pressure Vessel Steel

·        Nuclear-Grade Pressure Vessel Steel, subject to the applicable design and certification requirements

Scope

JIS G 3120 covers quenched and tempered alloy steel plates intended for pressure-containing equipment. The specified alloy systems and heat-treatment conditions are designed to provide the mechanical properties required for demanding industrial service.

Typical applications include:

·        Nuclear reactor pressure vessels

·        Industrial pressure vessels

·        Heavy-duty pressure-containing equipment

·        High-pressure process vessels

·        Power generation equipment

·        Specialized industrial vessels requiring high-strength alloy steel

Steel Grades Covered

The JIS G 3120 grade series includes the following designations. Confirm the exact grade and suffix against the applicable edition and purchase specification before ordering.

Manufacturing Process

JIS G 3120 alloy steel plates are produced through controlled steelmaking, rolling, and heat-treatment processes.

Typical manufacturing stages include:

·        Steelmaking and refining

·        Alloying and chemical composition control

·        Slab casting

·        Reheating and hot rolling

·        Plate levelling and dimensional finishing

·        Quenching and tempering

·        Final inspection and preparation for dispatch

Manufacturing Conditions

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

Common considerations include:

·        Controlled alloy additions

·        Hot rolling to the specified dimensions

·        Quenching and tempering in accordance with the applicable requirements

·        Control of plate flatness and dimensional tolerances

·        Surface preparation according to the order specification

Heat Treatment

Quenching and tempering are central to JIS G 3120 production.

·        Quenching: The plate is heated and cooled under controlled conditions to develop the required hardened structure.

·        Tempering: The quenched plate is reheated under controlled conditions to achieve the required balance of strength and toughness.

·        Alternative treatment: Any alternative heat-treatment condition must be agreed between the purchaser and manufacturer and must comply with the applicable standard.

The actual heat-treatment temperatures and holding times depend on the grade, thickness, and specification requirements.

Surface Finish

Available surface finishes may include:

·        Hot-rolled and heat-treated mill finish

·        Descaled surface

·        Shot-blasted surface

·        Prepared surface for coating

·        Primer-coated surface, subject to agreement

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

Delivery Condition

Plates are generally supplied in the quenched and tempered condition required by JIS G 3120.

Other requirements should be agreed with the manufacturer and verified against the applicable standard before ordering.

Available supply arrangements may include:

·        Quenched and tempered plates

·        Cut-to-size plates

·        Plates with agreed surface preparation

·        Customized dimensions, subject to availability

Dimensions and Tolerances

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 processing feasibility

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

Pressure Vessel Alloy Steel Characteristics

JIS G 3120 alloy steel plates are intended for demanding pressure vessel applications requiring controlled mechanical properties.

Key characteristics include:

·        High strength after quenching and tempering

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

·        Controlled toughness and elongation requirements

·        Suitability for heavy-duty pressure-containing equipment

·        Fabrication and welding suitability when appropriate procedures are followed

·        Grade-specific mechanical properties for engineering design

For nuclear reactor applications, material acceptance and use must also comply with the relevant design code, regulatory requirements, and project-specific qualification procedures.

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

·        Quenched and tempered pressure vessel plates

·        Heavy alloy steel plates

·        Cut-to-size plates

·        Plates in customized dimensions

Applications

JIS G 3120 alloy steel plates are used in specialized pressure-containing applications, including:

·        Nuclear reactor pressure vessels

·        Other pressure vessels

·        Power generation equipment

·        Heavy-duty industrial vessels

·        High-pressure process equipment

·        Specialized energy-sector equipment

·        Fabricated structures requiring specified high-strength alloy steel

Key Features

·        Manufactured to the JIS G 3120 specification when supplied with the required certification

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

·        Quenched and tempered material condition

·        Controlled chemical composition and mechanical properties

·        Suitable for specified pressure vessel applications

·        Available in different grades and dimensions, subject to order requirements

Availability

JIS G 3120 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 surface-finish requirements

·        Inspection, certification, and project specifications

Please provide the required grade, dimensions, quantity, and certification requirements when enquiring.

Conclusion

JIS G 3120 specifies quenched and tempered manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for nuclear reactors and other pressure vessels. These materials are selected for their strength, toughness, and controlled mechanical properties under demanding service conditions.

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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