ASME SB-443 Inconel 625 Pressure Vessel Lining Plates
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Gnee Alloy's Solutions for ASME SB-443 Inconel 625 Pressure Vessel Lining Plates
Drawing on 20 years of experience supplying lining plates for over 300 pressure vessel projects, the following unique advantages make Inconel 625 the material of choice
Full Compliance with ASME Code Requirements
Each plate is manufactured and certified to the ASME SB-443 standard, accompanied by comprehensive technical documentation supporting ASME BPVC construction requirements. This eliminates issues for fabricators caused by code approval delays or inspection failures.
Superior Corrosion Resistance in the Heat-Affected Zone (HAZ)
Thanks to the stabilizing effect of Niobium (Nb), Inconel 625 maintains excellent corrosion resistance even within the weld heat-affected zone. For lined vessels involving hundreds of meters of weld seams, this ensures decades of reliable operation free from intergranular corrosion.
No Mandatory Post-Weld Heat Treatment (PWHT)
Unlike precipitation-hardened alloys, Inconel 625 does not require post-weld solution annealing for most corrosive service conditions. This shortens the vessel fabrication cycle (saving weeks of time) and significantly reduces total project costs.
Broad Compatibility with Diverse Corrosive Process Media
The alloy performs reliably in both oxidizing and reducing environments, making it suitable for chloride-containing process fluids, organic and inorganic acids, and moderately sour service conditions (H₂S/CO₂). A single alloy grade meets the application requirements for the majority of chemical and petrochemical vessels.
Excellent Formability
In the annealed condition, Inconel 625 can be readily formed into cylindrical shells, dished heads, and complex vessel components without the need for intermediate annealing. This reduces the risk of cracking and lowers the rate of manufacturing rejects.
Proven Long Service Life
In typical chemical reactor lining applications, Inconel 625 offers a service life of 15 to over 25 years-three to five times that of 316L stainless steel. For continuous production facilities, this translates into substantial savings in downtime and replacement costs.
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ASME SB-443 Inconel 625 Pressure Vessel Lining Plates description
GNEE ASME SB-443 Inconel 625 Pressure Vessel Lining Plates | UNS N06625 Supplier
ASME SB-443 (equivalent to ASTM B443) covers Inconel 625 (UNS N06625 / W.Nr. 2.4856) in the form of plate, sheet, and strip, available in either hot-rolled or cold-rolled conditions. Valued for its high strength and exceptional resistance to corrosion and chloride-induced stress corrosion cracking, the material is widely used for weld overlays or integral linings in pressure vessels, particularly in corrosive, high-temperature, and marine environments.
Regarding ASME Section VIII design allowable stresses, solution-annealed (Grade 2) plate exhibits high allowable stress values at operating temperatures up to 1100°F (approx. 593°C). Key performance characteristics include a nickel-chromium-molybdenum composition that provides near-impervious resistance to pitting, crevice corrosion, and oxidizing/reducing mixed acids, as well as virtual immunity to chloride-ion stress corrosion cracking; mechanically, it maintains high yield and tensile strength from cryogenic temperatures up to 1800°F (982°C) without the need for strengthening heat treatments.
In terms of fabrication, SB-443 plate is primarily used for loose linings, explosion-bonded or roll-bonded composite plates, and as weld overlay cladding to protect carbon or low-alloy steel vessel walls. Welding typically employs INCONEL 625 filler metal or INCONEL 112 electrodes to ensure structural integrity and corrosion resistance at the joints; however, due to the alloy's inherent toughness, specialized tooling and machining parameters are required during processing.
Overview of Material Selection for ASME SB-443 Inconel 625 Pressure Vessel Liners
| Parameter | ASME SB-443 (Inconel 625) | Pressure Vessel Lining Engineering Requirements |
|---|---|---|
| Applicable Standard | ASME SB-443 (Boiler & Pressure Vessel Code) | ASME Section VIII Div. 1 & 2 Pressure Vessels |
| Equivalent Standard | ASTM B443, AMS 5599 | Material properties are identical; ASME adds Code quality system requirements |
| UNS Number | N06625 | Nickel-base high-temperature alloy |
| Material Type | Ni-Cr-Mo-Nb Solid-Solution Strengthened Alloy (UNS N06625) | No precipitation hardening heat treatment required |
| Product Form | Plate (> 4.8mm), Sheet (0.46–4.8mm), Strip (0.13–0.46mm) | Vessel internal lining layer, weld overlay cladding |
| Supply Condition | Grade 1 (Annealed) - Standard choice for ≤ 593°C Grade 2 (Solution Annealed) - High-temperature choice for > 593°C |
Selected based on design temperature and corrosive media |
| ASME Section VIII Maximum Temperature | Grade 1: 1200°F (649°C) Grade 2: 1600°F (871°C) |
Core selection criterion for lining material |
| Melting Process | VIM + ESR (standard) or VIM + VAR (specified) | High cleanliness requirement |
| Certification Requirements | EN 10204 Type 3.2 + ASME Data Report + "SA" marking | ASME Authorized Inspector witness required |
Click to obtain the technical selection assessment and MTC 3.1 sample for Inconel 625 liners
Key performance characteristics of ASME SB-443 Inconel 625 Pressure Vessel Liners
Chemical composition of ASME SB-443 Uns N06625 Pressure Vessel Liners
| Element | ASME SB-443 Limit (wt%) | Role in Pressure Vessel Lining Performance | |
|---|---|---|---|
|
|
Nickel (Ni) | ≥ 58.0 (balance) | Forms stable austenitic matrix; provides inherent chloride SCC resistance |
| Chromium (Cr) | 20.0 – 23.0 | Delivers general corrosion and high-temperature oxidation resistance | |
| Molybdenum (Mo) | 8.0 – 10.0 | Dramatically improves pitting and crevice corrosion resistance in chloride media | |
| Niobium + Tantalum (Nb+Ta) | 3.15 – 4.15 | Stabilizes weld heat-affected zones; prevents intergranular corrosion | |
| Iron (Fe) | ≤ 5.0 | - | |
| Carbon (C) | ≤ 0.10 | Tightly controlled for weldability and corrosion stability | |
| Manganese (Mn) | ≤ 0.50 | - | |
| Silicon (Si) | ≤ 0.50 | - | |
| Phosphorus / Sulfur | ≤ 0.015 each | Minimized for optimum toughness and corrosion resistance |
Gnee Alloy Superalloy Spectrometer Test Records
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Room-Temperature Mechanical Properties of ASME SB-443 Inconel 625 Liner Plate
Below are the mandatory minimum values required by the ASME specification at room temperature. Actual mill test values are typically higher.
Grade 1 (Annealed) – Up to 593°C Service
| Thickness Range | Tensile Strength (Min) | 0.2% Yield Strength (Min) | Elongation (Min) |
|---|---|---|---|
| Sheet / thin lining (≤ 4.76 mm) | 690 MPa | 275 MPa | 30% |
| Plate / heavy lining (> 4.76 mm) | 690 MPa | 414 MPa | 30% |
Grade 2 (Solution Annealed) – High-Temperature / Creep Service
| Thickness Range | Tensile Strength (Min) | 0.2% Yield Strength (Min) | Elongation (Min) |
|---|---|---|---|
| Sheet / thin lining (≤ 4.76 mm) | 690 MPa | 275 MPa | 30% |
| Plate / heavy lining (> 4.76 mm) | 690 MPa | 414 MPa | 30% |
Note: The minimum room-temperature property requirements for Grade 2 materials are identical to those for Grade 1; however, they must undergo solution annealing at a higher temperature (minimum 1093°C) to ensure the complete dissolution of grain boundary precipitates. This imparts excellent high-temperature creep resistance, resistance to intergranular corrosion, and oxidation resistance in environments exceeding 600°C.
ASME SB-443 Inconel 625 (UNS N06625 / W.Nr. 2.4856) Liner Plate Physical Properties
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ |
| Modulus of Elasticity | 205 GPa |
| Continuous Oxidation Service Limit | ~980°C in air |
| Melting Range | 1290 – 1350°C |
Click to download the Inconel 625 alloy PDF datasheet
inconel 625 Pressure Vessel Liners Melting & Manufacturing Requirements
| Parameter | ASME SB-443 (Standard) | Pressure Vessel Lining Engineering Practice |
|---|---|---|
| Melting Process | VIM + ESR (typical); VIM + VAR (when specified) | High cleanliness requirement - affects lining fatigue life |
| Product Definition | Plate: ≥ 4.8mm (0.188"); Sheet: 0.46–4.8mm; Strip: 0.13–0.46mm | Selected based on vessel size and lining thickness design requirements |
| Hot/Cold Working | Hot-rolled (plate); cold-rolled (sheet/strip) | Controlled reduction ratio ensures grain refinement |
| Grade 1 Heat Treatment | Annealed ≥ 871°C (1600°F), rapid cool | Standard lining choice - higher strength |
| Grade 2 Heat Treatment | Solution annealed ≥ 1093°C (2000°F), rapid quench | High-temperature lining choice - superior creep resistance |
| Surface Finish | Pickled, blasted, or bright annealed | Linings require pickled/blasted surface for clad bond quality |
| Edge Condition | Sheared, slit, or machined edges | Machined bevel required for butt weld joints |
Contact us to learn about our Inconel 625 production process
ASME SB-443 Inconel 625 Lining - Comparison of ASME Code Temperature Limits
| ASME Code Section | Grade 1 (Annealed) | Grade 2 (Solution Annealed) |
|---|---|---|
| Section I (Power Boilers) | 1100°F (593°C) | 1100°F (593°C) |
| Section VIII Div. 1 (Pressure Vessels) | 1200°F (649°C) | 1600°F (871°C) |
| Section XII (Transport Tanks) | 650°F (343°C) | 650°F (343°C) |
Critical Selection Conclusion:
Service temperature ≤ 593°C: Select Grade 1 (Annealed) - higher yield strength, lower cost
Service temperature > 593°C (up to ~ 870°C): Select Grade 2 (Solution Annealed) - superior creep resistance
ASME SB-443 Inconel 625 Grade1 & Grade2 Plate heat treatment
| Parameter | Grade 1 (Annealed) | Grade 2 (Solution Annealed) |
|---|---|---|
| Heat Treatment Temperature | ≥ 871°C (1600°F) | ≥ 1093°C (2000°F) |
| Grain Size | Finer | Coarser (grain growth at higher temperature) |
| Recommended Service Temperature | ≤ 593°C (1100°F) | > 593°C (1100°F), when creep resistance is required |
Do you require third-party witness of aging cycle?
Gnee Alloy ASME SB-443 Inconel 625 Plate Specifications and Supply Options
Gnee Alloy ASME SB-443 Inconel 625 Typical Size Range
| Dimension | Typical Range | Notes |
|---|---|---|
| Thickness | 0.5 mm – 150 mm | Cold-rolled: 0.5–50mm; Hot-rolled: 5–150mm |
| Width | 1000 mm – 2500 mm | Wider widths available by special order |
| Length | 2000 mm – 8000 mm | Custom lengths available |
| Common Stock Sizes (Plate) | 3.18mm, 4.75mm, 6.35mm, 9.53mm, 12.7mm, 15.9mm, 19.1mm, 25.4mm, 38.1mm, 50.8mm, 63.5mm, 76.2mm |
Dimensional Tolerances
| Parameter | Typical Tolerance | Source |
|---|---|---|
| Thickness Tolerance | ±0.02mm or ±10% (whichever is greater), per ASTM B906 | |
| Precision Cold-Rolled | ±0.05mm | |
| Surface Finish (Lining Grade) | Ra ≤0.8μm (mirror polished) to Ra ≤1.6μm (grinded) | |
| Edge Condition | Sheared, slit, machined, abrasive cut, plasma-torch cut | For butt weld lining joints, machined bevel is required |
Contact us to customize Inconel 625 products to your project specifications
Gnee Alloy Inconel 625 Liner Surface Treatment
| Condition | Description |
|---|---|
| Annealed & Pickled | Standard for industrial linings |
| Bright Annealed | Suitable for pharmaceutical / high-purity applications |
| Mechanically Polished | 180 grit / 320 grit / Mirror finish |
Value-added processing services offered by Gnee Alloy
To reduce your in-house fabrication workload, we offer
| Service | Description |
|---|---|
| Precision Cutting | Precision plasma or waterjet cutting to vessel design dimensions |
| Weld Edge Preparation | Beveling (V-groove, X-groove, U-groove) for automatic welding |
| Surface Grinding & Polishing | Surface finishing as required |
| Assembly Marking & Labeling | Sequential identification and tagging services |
| Explosion-Clad Plate Supply | Inconel 625 clad onto carbon steel / low-alloy steel substrates |
Contact us to customize services for your project
Typical Pressure Vessel Applications for Inconel 625 Clad Plate
Our ASME SB-443 Inconel 625 clad plates are widely used in a variety of critical process equipment:
| Chemical Processing | Chemical reactors and autoclaves |
| Oil & Gas Production | High-pressure separators and flash tanks |
| Environmental Control | Flue gas desulfurization (FGD) absorber towers |
| Oil & Gas (Sour Service) | Process vessels for sour service in oil and gas production |
| Marine / Desalination | Seawater desalination pressure vessels |
| Petrochemical / Refining | Hydroprocessing reactor internals |
| Pharmaceutical & Fine Chemical | Pharmaceutical and fine chemical process vessels |
| Waste Treatment | Waste treatment pressure vessels |
ASME SB-443 Inconel 625 Non-destructive Testing (NDT) for Plate
| Test Method | Applicable Object | Reference Standard | Notes |
|---|---|---|---|
| Ultrasonic Testing (UT) | Base plate, clad interface | ASME Section V | Can detect defects in Inconel 625 cladding layer; reference blocks must match cladding material |
| Liquid Penetrant Testing (PT) | Lining-side surface, welds | ASTM E1417 / ASME Sec. V | Detects surface-breaking defects (cracks, porosity, etc.) |
| Radiographic Testing (RT) | Welds (especially butt welds) | ASME Section V | 100% weld coverage required |
| Eddy Current Testing (ET) | Tube or thin sheet | ASTM E426 | Selected based on product form |
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Why Choose Gnee Alloy Inconel 625 Products?
Mill-grade full-element spectroscopic analysis and tensile property verification
Inspection of dimensions, flatness, and surface quality
Optional: Intergranular corrosion testing per ASTM G28 Method A/B
Optional: Ultrasonic testing (UT) per ASME plate acceptance standards
Optional: PMI (Positive Material Identification) verification
Optional: Compliance with NACE MR0175 / ISO 15156 standards for sour service environments
Optional: Third-party witness inspection by certifying bodies such as SGS, TÜV, BV, or DNV
Gnee Alloy Inconel 625 certificate
Click to view our professional certificates for Inconel 625 alloy
FAQ
Q1: Can I substitute ASTM B443 for ASME SB-443 in my pressure vessel?
A: Technically, NO. While the chemistry is identical, only ASME SB-443 is legally approved for use under the ASME Boiler and Pressure Vessel Code. Sourcing the wrong certification can ground your entire project.
Q2: How do you prevent corrosion behind the lining plate?
A: Integrity starts with the weld. We recommend matching Alloy 625 (ERNiCrMo-3) filler metal and offer 100% dye penetrant and ultrasonic testing (UT) to ensure Zero-Leakage at every seam.
Q3: What thickness is recommended for a high-pressure reactor lining?
A: Standard industrial linings range from 1.5mm to 10mm. We maintain a massive Wholesale Inventory across this entire range to ensure Short Lead Times for emergency maintenance.
Q4: Do you offer trial quantities for coupon testing?
A: Yes. We support Innovation and R&D by offering Flexible MOQs for certified material coupons for site corrosion validation.
Get a Competitive Quote for Inconel 625 Plate
China Spot Stock | EN 10204 3.1 MTC | NACE MR0175 | ISO 9001:2015 | Ships to over 50 countries/regions within one week
mailto:ss@gneemetal.comHot Tags: asme sb-443 inconel 625 pressure vessel lining plates, China asme sb-443 inconel 625 pressure vessel lining plates suppliers
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