Monel 400 Plates Manufacturer & Supplier

Monel 400 plates are nickel-copper alloy plates with a minimum of 63% nickel and 28 to 34% copper, manufactured to ASTM B127 / ASME SB-127. Alloy 400 plates deliver exceptional resistance to seawater, hydrofluoric acid, and de-aerated sulphuric acid. This makes them a preferred choice for marine, chemical processing, and heat exchanger applications.

The alloy keeps its strength and properties from very low temperatures up to 1,000°F (538°C). In its softened (annealed) state, Monel 400 plate has a tensile strength of 70,000 psi (480 MPa), a yield strength of 28,000 psi (195 MPa), and can stretch 35% before breaking.

Sachiya Steel International is a trusted manufacturer, supplier, stockist, and exporter of Monel 400 plates, based in Mumbai, India. Founded in the year 2005, we operate under ISO 9001, 14001, and 45001 certifications. We maintain a ready-to-ship inventory of 1,500 to 2,000 metric tons.

Our Monel 400 plates are available in thicknesses from 3/16 inch (4.76 mm) to 4 inches (101.6 mm), widths up to 72 inches (1828 mm), and lengths up to 200 inches (5080 mm). Custom cutting is available on request. We comply with AMS 4544 and BS 3072 NA13. Plates are supplied in hot rolled, annealed, and bright annealed finishes.

This page covers:

Specifications
Pricing
Chemical Composition
Mechanical Properties
Equivalent Designation
Industrial Applications
Monel 400 vs SS 316
Shipping & Packaging
Frequently Asked Questions

Monel 400 Plates Specifications

The specifications of Monel 400 plates, including standard, surface finish and length, are listed in the table below.

Parameter	Details
Standards	ASTM B127 / ASME SB-127
Size Range	Width: 1000 mm to 2500 mm, Length: 2000 mm to 6000 mm
Thickness	0.5 mm to 100 mm
Length	Up to 6000 mm (custom cut sizes available)
End Type	Sheared, Flame Cut, Saw Cut
Surface Finish	Hot Rolled (HR), Cold Rolled (CR), 2B, No.1, BA, Mirror Finish
Form	Plates, Sheets, Coils, Flats

Available Sizes of Monel 400 Plates

Monel 400 plates are stocked in a wide range of thicknesses, widths, and lengths to meet project-specific requirements. The table below summarises our standard size range.

Dimension	Range
Thickness (Plate)	3/16" (4.76 mm) to 4" (101.6 mm)
Thickness (Sheet)	0.018" (0.46 mm) to 0.140" (3.56 mm)
Width	Up to 72" (1828 mm)
Length	Up to 200" (5080 mm)
Custom Cutting	Available on request

We stock both standard mill sizes and can arrange custom-cut Alloy 400 plates to your exact dimensions. Mill test certificates are provided with every order.

Monel 400 Plate Surface Finishes

Monel 400 plates are available in the following finishes.

Hot Rolled Finish

Annealed Finish

Bright Annealed Finish

Monel 400 Plate Price

Monel 400 plate prices start from approximately Rs 1,200/kg in India. In the US market, pricing is $25 to $55 perkg, significantly depending on thickness, dimensions, and quantity. A 3/8 inch x 12-inch x 24-inch plate retails at approximately $1,961.

Prices fluctuate with nickel and copper commodity markets. AMS 4544 specification plates cost more than standard commercial ASTM B127 plates. Contact Sachiya Steel International for current pricing on Monel 400 plates in your required size and finish.

Chemical Composition of Monel 400 Plates

Monel 400 plates contain a minimum of 63% nickel and 28 to 34% copper, with controlled additions of iron, manganese, carbon, silicon, and sulphur per ASTM B127. The high nickel content provides the alloy's corrosion resistance, while copper improves performance in reducing acid environments. Iron and manganese are present in controlled amounts to support solid-solution strengthening.

Nickel Ni

63.0% min

Copper Cu

28.0 – 34.0%

Iron Fe

Max 2.5%

Manganese Mn

Max 2.0%

Silicon Si

Max 0.5%

Carbon C

Max 0.3%

Sulphur S

Max 0.024%

Mechanical Properties of Monel 400 Plates

The table below lists the mechanical properties of Monel 400 plates in the annealed condition, per ASTM B127 / ASME SB-127. Monel 400 plate hardness ranges from 110 to 149 Brinell (Rockwell B60 to B79) depending on the temper condition. The alloy retains good ductility at cryogenic temperatures, which makes it suitable for LNG and low-temperature processing equipment.

480 / 70

MPa (ksi)

Tensile Strength

195 / 28

MPa (ksi)

Yield Strength (0.2% offset)

Elongation (in 2 in.)

110–149

Hardness (Brinell)

Property	Value
Tensile Strength	70,000 psi (480 MPa)
Yield Strength (0.2% offset)	28,000 psi (195 MPa)
Elongation (in 2 in.)	35%
Hardness (Brinell)	110 HB (range 110 - 149 HB)

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Monel 400 Equivalent Designations

Monel 400 is recognised under several international designations. The table below provides equivalent standards and trade names for buyer reference across regions.

Standard System	Designation
UNS	N04400
Werkstoff (EN)	2.4360
DIN	NiCu30Fe
AFNOR	NU30
EN	NiCu30Fe

Monel 400 Plates Industrial Applications

Monel 400 plates find use across 4 major industrial sectors. Because it resists seawater, hydrofluoric acid, sulphuric acid, and alkalis, it can be used in tough, corrosive environments.

Marine Engineering

Monel 400 plates are a standard material for propeller shafts, seawater piping systems, and marine fasteners.

Chemical & Hydrocarbon Processing

Alloy 400 plates perform well in hydrofluoric acid alkylation units and sulphuric acid processing equipment.

Heat Exchangers & Boiler Components

It is used for heat transfer applications, feedwater heaters, condenser tubes, and boiler components.

Oil & Gas Equipment

Monel 400 plates serve in wellhead components, valve bodies, and downhole tools exposed to sour gas environments.

Monel 400 Plates vs Stainless Steel 316 Plates

Monel 400 plates outperform stainless steel 316 plates in seawater, hydrofluoric acid, and de-aerated sulphuric acid environments. The table below compares key properties. While Monel 400 costs 3 to 5 times more per kg than stainless steel 316, its superior corrosion resistance in marine and acid environments delivers longer service life and lower total cost of ownership for applications where 316 would fail prematurely.

Property	Monel 400	Stainless Steel 316
Nickel Content	63% min	10 - 14%
Seawater Resistance	Excellent	Moderate (pitting risk)
HF Acid Resistance	Excellent	Poor
Tensile Strength	70,000 psi (480 MPa)	75,000 psi (515 MPa)
Approximate Cost	3 to 5x higher	Baseline
Max Service Temperature	1,000°F (538°C)	1,500°F (816°C)

Shipping & Packaging

Heavy-duty wooden boxes Packing

Export Packaging Standard

We strictly follow seaworthy export handling standards to protect super Monel 400 plate from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

Heavy-duty wooden boxes with moisture barrier lining
HDPE stretch film wrapping on all bundles
Edge and corner protection with plastic padding
Silica gel desiccants to minimize moisture exposure
ISPM-15 fumigated wooden packaging for export

Plate Bundle Yard Staging

Plate Bundle Edge Protection

Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies Monel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

USA
Canada

Frequently Asked Questions

What ASTM standard covers Monel 400 Plates? +

Monel 400 plates are manufactured to ASTM B127 / ASME SB-127, which covers nickel-copper alloy plate, sheet, and strip. Aerospace applications also reference AMS 4544.

What thicknesses are Monel 400 Plates available in? +

Monel 400 plates are available in thicknesses from 3/16 inch (4.76 mm) to 4 inches (101.6 mm). Sheet thicknesses start from 0.018 inch to 0.140 inch. Custom sizes are available on request.

What is the price of Monel 400 Plates per kg? +

Monel 400 plate prices range from approximately Rs 1,200/kg in India and $25 to $55 per kg. $25 to $55 perkg. The final price varies by thickness and quantity. Final price depends on dimensions, finish, quantity, and current nickel market conditions. Request a quote for accurate pricing.

Can Monel 400 Plates be welded? +

Monel 400 plates have good weldability using GTAW (TIG) and GMAW (MIG) processes with ERNiCu-7 filler metal. Preheat is generally not required. The alloy's P-number is 42 per ASME Section IX.

Is Monel 400 Plate magnetic? +

Monel 400 is slightly magnetic at room temperature. Its Curie temperature is 50 °F (10 °C), meaning the alloy becomes weakly ferromagnetic below this temperature. Buyers in instrumentation or magnetically sensitive applications should account for this property.

What is the difference between Monel 400 Plate and Monel 400 Sheet? +

The distinction is thickness: Monel 400 sheet is typically 0.018 inch to 0.140 inch thick, while Monel 400 plate starts at 3/16 inch (0.1875 inch) and goes up to 4 inches. Both product forms are covered by ASTM B127 / ASME SB-127.

Is Alloy 400 the same as Monel 400? +

Alloy 400 is the generic industry name for Monel 400. The material specifications (ASTM B127), chemical composition, and mechanical properties are identical regardless of the trade name used.

What is the maximum service temperature for Monel 400 Plates? +

Monel 400 plates can operate at temperatures from subzero to 1,000 oF (538 oC). The alloy maintains good mechanical properties across this full range. It is particularly valued for cryogenic applications in LNG and low-temperature processing.

How to weld Monel 400 Plates? +

Monel 400 plates are weldable via TIG and MIG using ERNiCu-7 filler; it does not require preheat, and the interpass temperature is below 150°C; P-No. 42, with post-weld annealing restoring corrosion resistance.