ASTM B127 Monel 400 + ASTM A516 Gr.60 Steel Clad Plate Explosive Cladding Pressure Vessel
ASME SA516 Gr.60 Carbon Steel + ASME SB127 UNS N04400/Monel 400 Explosion Bonded Clad Plate
ASTM B127 Monel 400 + ASTM A516 Gr.60 Explosive Clad Plate is a two-layer metallurgically bonded composite material used in pressure vessel construction, consisting of:
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Cladding layer (corrosion-resistant): ASTM B127 – Monel 400 (a nickel‑copper alloy, UNS N04400)
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Base/backing layer (structural): ASTM A516 Grade 60 – carbon steel plate for moderate‑temperature pressure vessel service
The two layers are permanently joined by explosive cladding (explosion welding), which creates a high‑strength, wavy metallurgical bond without melting the interface.
When this clad plate is fabricated into a pressure vessel (e.g., a tank, reactor, or column), the Monel 400 side faces the corrosive process fluid, while the carbon steel provides the mechanical strength to withstand internal pressure.
Common Cladding Material Combinations (Structural Base + Corrosion-Resistant Cladding)
| Base Material | Cladding Material | Key Properties | Common Applications |
|---|---|---|---|
| Carbon Steel (e.g., SA516 Gr.60/70) |
Stainless Steel 316/316L (UNS S31600/S31603) |
Moderate corrosion resistance (acids, chlorides), cost-effective. | Chemical tanks, food processing, marine components. |
| Carbon Steel (SA516 Gr.60/70) |
Monel 400 (UNS N04400) |
Superior seawater/acid resistance, non-magnetic, high strength. | Offshore platforms, seawater heat exchangers, HF acid reactors. |
| Carbon Steel (SA285 Gr.C) |
Inconel 625 (UNS N06625) |
Extreme corrosion/oxidation resistance, high-temperature strength (>1000°C). | Flue gas desulfurization (FGD), aerospace, nuclear. |
| Carbon Steel (SA516 Gr.60/70) |
Hastelloy C-276 (UNS N10276) |
Resists pitting/crevice corrosion in chlorides, acids, and sour gas. | Chemical reactors, pollution control, pharmaceutical. |
| Stainless Steel 304L | Titanium Gr.2 (UNS R50400) |
Excellent for chlorides, seawater, oxidizing acids; lightweight. | Desalination plants, chlorine processing, heat exchangers. |
| Carbon Steel | Nickel 200/201 (UNS N02200/N02201) |
Resists caustics, high thermal/electrical conductivity. | Caustic evaporators, alkali processing, electronics. |
| Stainless Steel 316L | Tantalum (UNS R05200) |
Unmatched corrosion resistance (acids except HF), biocompatible. | HCl reactors, medical implants, semiconductor equipment. |
| Carbon Steel | Copper-Nickel 90/10 (UNS C70600) |
Marine biofouling resistance, erosion/corrosion protection. | Ship hulls, condensers, seawater piping. |
Purpose of using cladding materials
Choose cladding to save cost – use expensive Monel only on the corrosive surface, with cheap carbon steel providing strength. It also avoids brittle intermetallic phases, allows thick vessel walls, and is fully ASME code‑approved.
Applications
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Hydrofluoric Acid (HF) Alkylation Units (oil refineries) – the most common use.
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Seawater Heat Exchangers & Desalination vessels (where higher strength than Monel alone is needed).
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Caustic Evaporators (NaOH service).
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Sulfuric Acid Mixers (reducing acid environments).
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Sour Gas (H₂S) service with salt water – but verify NACE requirements (Monel 400 is not always recommended for very sour oilfield brines).
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