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316L Stainless Steel Heavy Plate and Thick Plate Supplier
Dongmeng Group supplies 316L stainless steel heavy plate for pressure equipment, chemical processing systems, marine components, storage tanks, industrial machinery and welded fabrication projects.
This page focuses on hot-rolled thick plate rather than decorative cold-rolled sheet. Our recommended supply range covers 6–100 mm thickness, with full plates, cut-to-size blanks and drawing-based profiles available after technical review.
316L is identified as UNS S31603 and is commonly ordered under ASTM A240/A240M. The current ASTM A240/A240M specification covers stainless steel plate, sheet and strip for pressure-vessel and general applications, while ASTM A480/A480M provides general flat-rolled stainless steel requirements, including dimensional tolerances and testing provisions.
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316L Stainless Steel Heavy Plate Specifications
| Item | Supply Options |
|---|---|
| Product | 316L stainless steel heavy plate, thick plate or cut plate |
| ASTM designation | ASTM A240/A240M Type 316L |
| UNS designation | UNS S31603 |
| EN designation | EN 1.4404 / X2CrNiMo17-12-2 |
| Recommended thickness | 6–100 mm |
| Typical thicknesses | 6, 8, 10, 12, 15, 16, 20, 25, 30, 40, 50, 60, 80 and 100 mm |
| Width | 1000–2000 mm or subject to mill availability |
| Length | 2000–6000 mm or cut to required dimensions |
| Manufacturing condition | Hot rolled, solution annealed and pickled |
| Standard surface | No.1 hot-rolled finish |
| Edge condition | Mill edge, sheared, plasma cut, waterjet cut or machined |
| Product form | Full plate, rectangular blank, ring blank or drawing-defined profile |
| Processing | Cutting, drilling, beveling, machining, bending and welding after review |
| Inspection options | PMI, dimensional inspection, surface inspection and UT when specified |
| Documentation | MTC, inspection report and agreed third-party documentation |
| Packaging | Protected steel pallet, wooden support or export packaging |
The exact dimensional tolerance should be stated in the purchase order. ASTM A480/A480M distinguishes inch-pound and SI requirements and notes that the product specification takes precedence where requirements conflict.
Heavy Plate Thickness Range
Dongmeng Group recommends positioning this page around 6–100 mm 316L plate.
| Thickness Range | Typical Purchasing Requirement |
|---|---|
| 6–12 mm | Tanks, covers, welded housings and general industrial fabrication |
| 15–25 mm | Flanges, supports, pressure components and structural parts |
| 30–50 mm | Heavy machinery, machined components, tube sheets and thick flanges |
| 60–100 mm | Large machined parts, heavy pressure components and project-specific blanks |
Availability varies by width, length, mill source, required standard and certification. Non-standard thicknesses should be confirmed before the buyer finalizes drawings.
Chemical Composition of 316L
The following values are representative maximum or range requirements commonly associated with flat-rolled Type 316L material. Final compliance must be based on the applicable purchase specification and the supplied mill certificate.
| Element | 316L Requirement |
|---|---|
| Carbon, C | ≤0.030% |
| Manganese, Mn | ≤2.00% |
| Silicon, Si | ≤0.75% |
| Phosphorus, P | ≤0.045% |
| Sulfur, S | ≤0.030% |
| Chromium, Cr | 16.0–18.0% |
| Nickel, Ni | 10.0–14.0% |
| Molybdenum, Mo | 2.00–3.00% |
| Nitrogen, N | ≤0.10% |
The molybdenum addition gives 316L improved resistance to pitting and crevice corrosion in many chloride-containing environments compared with 304/304L. It does not make the material immune to seawater, concentrated chlorides or every chemical environment.
Mechanical Properties
Typical minimum room-temperature requirements for annealed 316L flat products include:
| Property | Typical Minimum Requirement |
|---|---|
| Tensile strength | 485 MPa |
| 0.2% yield strength | 170 MPa |
| Elongation | 40% |
| Hardness | 95 HRB maximum |
Mechanical requirements can vary with the governing specification, product form and thickness. The mill test certificate should be used as the acceptance document for each supplied heat and plate.
Why Choose 316L for Heavy Plate Applications?
Improved Resistance in Chloride-Containing Environments
316L contains molybdenum, which generally improves pitting and crevice-corrosion resistance compared with 304L. It is widely considered for chemical-processing, food, pharmaceutical, pulp-and-paper and marine-related equipment where 304L may provide insufficient corrosion resistance.
Lower Carbon for Welded Fabrication
The maximum carbon content of 316L is lower than that of standard 316. This helps reduce the risk of chromium-carbide precipitation in heat-affected areas during welding, particularly where post-weld solution annealing is impractical.
The phrase "low carbon completely prevents corrosion after welding" should not be used. Weld design, filler metal, heat input, contamination control and post-weld cleaning remain important.
Suitable for Thick Welded Components
Heavy 316L plate is commonly selected for fabricated tanks, pressure-equipment components, supports, flanges and machined parts where both section thickness and corrosion resistance are required.
Good Fabrication Capability
316L can be welded, bent and machined, but it work-hardens during deformation and machining. Heavy plate processing therefore requires rigid equipment, suitable tooling, controlled feeds and adequate cooling.
316L Heavy Plate vs. 316L Sheet
| Comparison | 316L Heavy Plate | 316L Sheet |
|---|---|---|
| Page positioning | Industrial thick plate | Thin sheet and decorative fabrication |
| Typical thickness focus | 6–100 mm | Generally below 6 mm |
| Typical production form | Discrete hot-rolled plate | Cold-rolled sheet or cut-to-length coil |
| Main surface | No.1 hot rolled | 2B, BA, No.4 or decorative finishes |
| Typical processing | Heavy cutting, drilling, beveling and machining | Laser cutting, bending, stamping and polishing |
| Typical applications | Pressure equipment, tanks, flanges and heavy components | Covers, panels, enclosures and decorative products |
| Buyer priorities | Thickness tolerance, flatness, UT, MTC and cutting accuracy | Surface quality, protective film and bendability |
This distinction should be maintained throughout the page. Avoid placing decorative BA, mirror and PVD finishes in the primary specification table for heavy plate.
316L vs. 304L Heavy Plate
| Property | 316L Heavy Plate | 304L Heavy Plate |
|---|---|---|
| Molybdenum | Approximately 2–3% | Normally no deliberate Mo addition |
| Chloride resistance | Generally better | Lower than 316L |
| Material cost | Usually higher | Usually more economical |
| General fabrication | Good | Good |
| Typical selection | Chemical, coastal, marine-related and wash-down environments | General tanks, structures and less aggressive environments |
| Important limitation | Not immune to seawater or strong chloride attack | May pit earlier in chloride exposure |
316L should be selected from actual operating conditions rather than from the general term "marine grade." Chloride concentration, temperature, crevices, cleaning method and exposure duration all affect performance.
Available Plate Processing Services
Cut-to-Size Plate
Rectangular blanks can be supplied according to the required length and width, helping customers reduce material preparation work.
Drawing-Based Profile Cutting
Circular blanks, rings, flanges, equipment bases and irregular profiles can be evaluated from DXF, DWG, STEP or PDF drawings.
Plasma Cutting
Plasma cutting can be considered for thick industrial plate where productivity is more important than a fully machined cut edge.
Waterjet Cutting
Waterjet cutting can be considered where lower thermal influence and detailed profiles are required.
Laser Cutting
Laser cutting may be used within the available machine thickness and size range. It should not be presented as the default method for every 100 mm plate.
Drilling and CNC Machining
Bolt holes, machined faces, counterbores, grooves and other features can be evaluated according to the drawing, tolerance and quantity.
Edge Beveling
Weld-preparation bevels can be supplied when the required angle, root face, groove type and tolerance are specified.
Heavy Plate Quality Control
| Inspection Item | Inspection Focus |
|---|---|
| Material grade | Verification against order and MTC |
| Heat number | Traceability between plate marking and certificate |
| Chemical composition | Review of mill heat analysis |
| Mechanical properties | Review of tensile, yield and elongation results |
| Thickness | Measurement at agreed points |
| Length and width | Finished plate dimensions |
| Flatness | Checked according to agreed specification |
| Surface | Scale, pits, scratches, laminations and handling damage |
| Cut profile | Dimensions, edge condition and hole position |
| PMI | Alloy verification when requested |
| Ultrasonic testing | Internal-quality inspection when specified |
| Packaging | Edge protection, separation and transport support |
ASTM A480/A480M includes general testing provisions and allows special tests to be specified where required. Buyers should state UT standards, acceptance levels, flatness requirements and third-party inspection requirements before quotation rather than after production.
Material Documentation
Documentation can be quoted according to project requirements:
EN 10204 3.1 mill test certificate
Heat number and plate traceability
Chemical-composition report
Mechanical-property results
Dimensional inspection report
Positive material identification report
Ultrasonic testing report
Third-party inspection
Packing list and shipping documents
Do not claim that every stock plate automatically includes every test. Optional inspection and documentation should be confirmed in the quotation.
Typical Applications
316L stainless steel heavy plate is commonly evaluated for:
Chemical-processing tanks and vessels
Pressure-equipment components
Heat-exchanger components and tube sheets
Marine and coastal equipment
Pulp-and-paper processing machinery
Food and pharmaceutical equipment
Industrial storage tanks
Large flanges and rings
Pump and valve components
Scrubber and pollution-control equipment
Heavy machinery components
Custom welded and machined assemblies
Final material selection remains the responsibility of the project engineer and should consider pressure, temperature, chloride exposure, welding, cleaning and applicable design codes.
How to Specify 316L Heavy Plate
For an accurate quotation, please provide:
Required standard and grade
Thickness, width and length
Quantity or total weight
Full plate or cut-to-size requirement
Dimensional and flatness tolerances
Surface and edge condition
Cutting drawing
Hole and machining details
Bevel requirements
MTC and traceability requirements
PMI or UT requirements
Third-party inspection requirements
Packaging method
Delivery destination
Do not submit only "316L plate required." Heavy-plate pricing and availability depend heavily on dimensions, certification and cutting requirements.
Frequently Asked Questions
What thickness is considered 316L heavy plate?
There is no single universal commercial definition. For this page, Dongmeng Group recommends using 6 mm and above as the main thick-plate range, with a focus on 6–100 mm.
Is 316L plate supplied under ASTM A240?
ASTM A240/A240M covers chromium and chromium-nickel stainless steel plate, sheet and strip for pressure-vessel and general applications. The purchase order should specify the required revision, grade, units and supplementary requirements.
What surface is standard for thick 316L plate?
Hot-rolled heavy plate is normally promoted with a No.1 or equivalent hot-rolled, annealed and pickled surface rather than decorative BA or mirror finishes. Outokumpu lists No.1 as an ASTM quarto-plate finish for 316L product variants.
Can you supply 316L plate cut to drawing?
Rectangular blanks, rings and custom profiles can be quoted after reviewing the material thickness, dimensions, tolerances and drawing.
Can you provide ultrasonic testing?
UT can be arranged when the testing standard, probe coverage and acceptance class are specified before quotation.
Is 316L always suitable for seawater?
No. 316L offers better chloride resistance than 304L, but it can still suffer pitting and crevice corrosion in warm, stagnant or concentrated chloride environments.
Can 316L heavy plate be welded?
Yes. Conventional welding processes can be used with suitable procedures and filler metals. Thick-section welding requires control of joint design, heat input, distortion and post-weld surface cleaning.
Can 316L be hardened by heat treatment?
316L is not hardened through conventional heat treatment. Strength and hardness can increase through cold working.
Request a Quote for 316L Stainless Steel Heavy Plate
Send your plate list, drawings and inspection requirements to Dongmeng Group for availability review and quotation.
Email: office@dongmjd.com
Phone / WhatsApp: +86 157 6921 4734
Website: www.cndmmetal.com
Accepted Drawing Formats: PDF / DWG / DXF / STEP / STP
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