SA387 Alloy Steel Pressure Vessel Plates

SA387 Alloy Steel Pressure Vessel Plates

ASME SA 387 is a premium Chrome-Molybdenum alloy steel designed for use in weldable pressure vessels and industrial boilers. These plates excel in environments with elevated temperatures, making them indispensable for high-heat industrial applications.

SA387 steel plates are available in 5, 9, 11, 12, 22 and 91 grades 1 and 2 chromium-molybdenum alloy steel plates for high temperature + corrosive environments. Mainly used for boilers and pressure vessels.

SA 387 Grade 11: Features a minimum tempering temperature of 1150 °F.

SA 387 Grade 22: Features a minimum tempering temperature of 1250 °F, offering superior performance in higher heat ranges.

GNEE proudly manufactures and exports SA387 alloy steel pressure vessel plates, delivering reliable and high-performance materials for industrial applications worldwide. Our plates are specifically engineered for high-pressure, high-temperature environments, making them ideal for petrochemical plants, refineries, hydrogenation reactors, and industrial boilers.

GNEE serves wholesalers, procurement companies, and international B2B clients across Ecuador, Peru, Venezuela, UAE, Saudi Arabia, Bahrain, Oman, Qatar, Nigeria, Ghana, Kazakhstan, Russia, Singapore, Vietnam, Thailand, Australia, and Brunei.

Technical Specifications

Available Classes: Provided in Class 1 or Class 2.

Delivery Conditions: Normalized & Tempered (N+T) or Quenched & Tempered (Q+T).

Thickness Range: From 3/16" up to 10" (custom heavy plates available).

Severe Environment Testing: For demanding applications, we perform API 934 Testing to ensure structural integrity.

SA387 alloy steel plates are premium chromium-molybdenum (Cr-Mo) steels designed to provide:

High creep and fatigue resistance at elevated temperatures

Superior tensile strength and impact toughness

Reliable performance under cyclic and sustained loads

Typical Applications

These grades are widely used in sectors where temperature resistance is critical but corrosion concerns are limited:

Oil Refineries: High-temperature processing units.

Power Plants: Boiler drums and high-pressure steam pipes.

Chemical Plants: Heat exchangers and reactor vessels.

Precision SA387 plates ready for industrial fabrication.

GNEE SA387 plates are manufactured to meet international quality and safety standards:

ASTM A387 / ASME SA387 compliance

ASME Boiler & Pressure Vessel Code (Section II)

Optional third-party inspection certificates: EN 10204 3.1 / 3.2

This compliance guarantees material integrity for clients operating in regions with strict safety and regulatory requirements, including the Middle East, Latin America, Africa, and Asia-Pacific.

ASME SA387 Pressure Vessel Plate Material Chemica Composition

ASME SA387 Vessel Steel Plate Mechanical Property

Key Advantages:

Chromium (Cr) improves resistance to high-temperature deformation

Molybdenum (Mo) enhances hydrogen and corrosion resistance

Balanced mechanical properties for welding, forming, and long-term service

SA387 Steel Boiler Plate Dimension Thickness Is In Inches

SA387 GR 5 CLASS 2: a high quality chromium-molybdenum alloy steel plate specially designed for weldable carbon steel pressure vessels at elevated temperatures.

SA387 GR 9 CLASS 2: A weldable carbon steel plate for pressure vessels and boilers at elevated temperatures. The addition of chromium and molybdenum to the material enhances the plate's corrosion and heat resistance.

SA387 GR 11 CLASS 2: ASME SA387 GR 11 Class 2 is a pressure vessel grade steel used in high temperature environments for a wide range of industries with high efficiency.

SA387 GR 12 CLASS 2: ASME SA387 Grade 12 is a chromium-molybdenum carbon alloy steel used in high temperature environments for weldable pressure vessels and industrial boilers.

SA387 GR 22 CLASS 2: We supply ASME SA387 Grade 22 Class 2 steel plate to manufacturers in the oil, gas and petrochemical industries.

SA387 GR 91 CLASS 2: ASME SA387 Grade 91 Class 2 carbon alloy steel plate is a material to consider when high temperature resistance and good corrosion resistance are required.

GNEE SA387 plates are widely applied in:

Refinery pressure vessels and reactors

Hydrogenation units and petrochemical process equipment

Steam boilers and high-pressure heat exchangers

Industrial energy and chemical plants

Our technical team can provide custom recommendations based on operating conditions such as temperature, pressure, and hydrogen exposure, ensuring the optimal grade selection for each project.

All SA387 alloy steel plates from GNEE are produced under strict quality control, including:

Advanced steelmaking techniques: EAF, LF, VD refining

Heat treatment: Normalizing and tempering for consistent mechanical properties

Thickness range: 8 mm – 250 mm, width up to 2,500 mm, length up to 12,000 mm

Full inspection: Ultrasonic, magnetic particle, chemical verification, and dimensional checks

This ensures that each plate is ready for demanding fabrication and high-pressure service.

For SA387 Alloy Steel Pressure Vessel Plates that meet international standards, project-specific requirements, and demanding industrial conditions, GNEE is your trusted supplier for global B2B export projects.

Contact GNEE today to request a quotation, technical datasheet, or project consultation, and ensure your pressure vessel projects use high-quality, reliable Cr-Mo alloy steel plates.

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What is SA 387 material?

Engineered for use in elevated temperature service, ASME SA387 Grade 12 is a chrome molybdenum carbon alloy steel for use in weldable pressure vessels and industrial boilers.

What is A387 grade 22 material?

Chrome Molybdenum Steel

Chrome Molybdenum Steel – ASTM A387 Grade 22 Class 2. The A387 Grade 22 Class 2 – a grade of chromium-molybdenum alloy – is mainly intended for use in pressure vessels and welded boilers, which are designed for use in elevated temperature service.

Does the material comply with API 934 requirements?

Yes, we provide elevated temper processing and supplemental testing to ensure full compliance with API 934 specifications.

Download API 934 Compliance Guide

What is the difference between Class 1 and Class 2?

Class 2 has higher tensile and yield strength requirements compared to Class 1, making it suitable for higher pressure designs.

Can you provide "Step Cooling" test results?

Yes, we can perform step cooling tests and provide J-factor/X-bar factor calculations to guarantee long-term stability.

Is the material MTC (Mill Test Certificate) provided to EN 10204 3.1 or 3.2?

Standard supply is 3.1. We welcome 3.2 inspection by third parties like Lloyd's Register, BV, or SGS.

What is the maximum thickness you can guarantee internal soundness for?

We offer plates up to 10" thick with 100% Ultrasonic Testing (UT) to ASTM A435 or A578 Level C standards to ensure zero internal defects.

What is SA 387 equivalent material in India?

The Sa 387 Gr 22 Equivalent Material is ASME SA387, EN 10028 10/11CrMo9-10, DIN 10CrMo9-10, BS 622-515B, AFNOR 36206, 12CD9-10 and Gost 10KH2M.

What is the difference between ASTM A182 and A387?

Both ASTM A182 grade F11 class 2 and ASTM A387 grade 11 steel are iron alloys. Their average alloy composition is basically identical. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

What is the difference between SA 516 and SA 387?

Compared to carbon steel plates, SA 387 Gr 11 plates offer superior corrosion and oxidation resistance while maintaining good tensile and yield strength. Compared to SA 516 Gr 70 plates, SA 387 Gr 11 plates have better resistance to oxidation and corrosion, making them a better choice for high-temperature environments.

What is SA 387 GR 22 material?

SA 387 Grade 22 Steel Plate
The SA 387 Grade 22 Steel is a pressure vessel steel made up of high-quality raw material and high technology. Commonly used for high-temperature tasks based on its high heat tolerance this steel plate can be exposed up to 600° while maintaining superb oxidation and corrosion resistance.

Get a Quote for SA 387 Gr 11/22

By exporting semi-finished rolled cylinders instead of raw plates, we leverage our advantages to offer you a landed cost 15-20% lower than your local processing.

Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.

GNEE STEEL PROCESSING

CTL&SL

Grinding Polishing

Cutting

Beveling

Forming

Maching

Auto Welding

Heat treatment

Painting

Engineering Services

1.CTL & SL SERVICE (141 SETS)

Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.

CTL FACILITIES
Max Length:16500mm

Max Width:2200mm

Max Thickness:25.4mm

Max Yield Strength:1500Mpa
 

SL FACILITIES

Max Width:2200mm

Max Thickness:18mm

Max slit Quantity:31

Max Yield Strength:1200Mpa

2.CUTTING SERVICE

GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.

Laser Cutting Machine

Max Cutting Length:40,000mm

Max Width:4,600mm
Max Thickness:100mm

Flame Cutting Machine

Max Cutting Length:40,000mm

Max Width:8,000mm
Max Thickness:500mm

Plasmas Cutting Machine

Max Cutting Length:30,000mm

Max Width:5,000mm
Max Thickness:100mm

Water-jet Cutting

Max Cutting Length:12,000mm

Max Width:4,010mm
Max Thickness:250mm

3.FORMING SERVICE

Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm

Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm

Expert in Bending High-Strength & Wear-Resistant Steels

Punching Machine

Max Width:3,070mm
Max Thickness:8mm

Max Pressure:250t

BEVELING SERVICE

GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.

Milling：
Max Cutting Length:18,000mm

Max Width:4500mm
Max Thickness:120mm

Beveling:
Max Length:16,000mm

Max Thickness:80mm

MACHINING SERVICE

GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.

Gantry Type Boring & Milling Maching Center

Max Length:48000mm

Max Width:12500mm
Max Height:8000mm

Max Diameter:10500mm

Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm

MMulti-hole Drilling Equipment

Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm

Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m

Vertical Lathe

Max Height:6,000mm

Max Diametar:φ22,00mm

Automated Edge Milling Machine

The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.

It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.

Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.

Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons

This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.

• Processing Accuracy

Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;

Width accuracy: ±1mm;

Diagonal accuracy: ±2mm;

Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.

• Processing Efficiency

The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.

HEAT TREATMENT

Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t

Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head

Case : Steel Plates Supply for 100,000m³ Full Containment Ammonia Storage Tank Project

GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.

One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.

Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production

Project Materials and Technical Requirements

The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.

Key technical specifications include:

Material grades: P355NL2 and P275NL2 (Normalized)

Yield strength: Standard minimum / Maximum limited to 390 MPa

Hardness: ≤ 225 HBW in base material

Impact testing: Charpy-V notch test at -50°C, minimum 27J

Certification: EN 10204 3.1 certificate, with optional 3.2 certification

These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.

Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.

Project Plate Quantities and Thickness Distribution

The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:

P355NL2 – Inner & Outer Tank Shell Plates

Lower shell courses: 50 mm thickness – approx. 2,000 tons

Middle shell courses: 25 mm thickness – approx. 1,400 tons

Upper shell courses: 10 mm thickness – approx. 500 tons

P275NL2 – Tank Bottom Plates

Thickness: 10–15 mm – approx. 750 tons

P275NL2 – Suspended Roof Structure

Thickness: 5–8 mm – approx. 180 tons

S275JR – Outer Roof (Ambient Structure)

Thickness: 10 mm – approx. 450 tons

To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.

Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.

GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.

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Stainless Steel Material and Surface Specifications

Special Steel / Nickel Base Alloy