904L Stainless Steel Plate
904L stainless steel plate is quoted as UNS N08904 / 1.4539 austenitic flat product. Common inquiry range: 3–50 mm. Send grade, standard, heat treatment, plate geometry and corrosion test plan with the RFQ.
Supply routes
- Qualified partner-mill sourcing
- In-house production or processing
Grade datasheets:904L
Where this product solves the job
- Process equipment where documented media, concentration, temperature and contaminants support a project-approved 904L selection.
- Plate and cut-part orders needing a high-alloy austenitic route with agreed PMI, heat identity and inspection documents.
- Fabrications whose welding plan accounts for high-alloy filler, heat input, cleanliness and post-weld surface restoration.
When we recommend another route
- A universal upgrade from 316L when no corrosion study, service data or materials approval supports the added alloy content.
- Strongly oxidizing or other environments where 904L has not been evaluated against more suitable alloys or nonmetallic materials.
- Last-minute substitution for 254 SMO, duplex or nickel alloy without checking code, strength, corrosion and fabrication consequences.
Standards we quote against
Send the product standard, edition and any dimensional or finish standard with the RFQ. We quote the ordered combination, not a generic grade name.
Ordered product standards: ASTM A240/A240M · EN 10088
What to send so we can quote the right route
- State UNS N08904 or 1.4539, governing product standard and edition, solution-annealed condition and any project chemistry additions.
- Give thickness, width, length or cut drawing, tolerance, flatness, bevel, machining allowance and quantity per item.
- Attach process medium, concentration range, temperature, impurities, cleaning and upset conditions for the responsible materials review.
- Define PMI stages, heat traceability, ordered corrosion or UT methods, specimen position, acceptance and report format.
- Identify welding and filler context, surface cleaning, critical faces, marking, packing and preservation for long-lead high-alloy material.
Specifications
| Grade | 904L / UNS N08904 / 1.4539 |
|---|---|
| Product standard | ASTM A240/A240M or EN 10088-2 |
| Typical thickness | Common inquiry range: 3–50 mm. |
| Delivery condition | Solution annealed and pickled |
| Documents | EN 10204 3.1 or the inspection document named in the RFQ |
| Optional inspection | Tests required by the purchased standard plus PMI, NDE or other checks named in the RFQ |
| Packing | Protected skid or case by cut-part geometry |
| Commercial basis | Quantity, MOQ, production route and delivery schedule are quoted for the ordered specification. |
Dimensions and Tolerances
| Thickness | Common inquiry range: 3–50 mm. |
|---|---|
| Order basis | Governing product and dimensional standard, delivery condition and any drawing-specific limits. |
| Special tolerances | Send special tolerances in the RFQ; we quote the accepted production route. |
Published ranges are technical references, not a live-stock or production-capability promise. We confirm the ordered size range, MOQ and delivery schedule in the quotation.
Edge or end condition
- Edge, end or facing condition as ordered from the product form, standard and fabrication need.
Testing and inspection
- Tests required by the purchased product standard.
- PMI, NDE, corrosion, roughness or other supplementary inspection quoted when the RFQ names method, lot scope and acceptance.
Order documents
- Heat identity with EN 10204 3.1, or the inspection document named in the RFQ, against mill, stock or partner-mill route.
- Supplementary reports linked to the ordered test plan.
Export packaging
- Sheets interleaved and film-wrapped where the finish needs it, strapped on export skids.
- Moisture protection selected for the sea route; packing method stated in the quotation.
A targeted corrosion grade
904L contains higher nickel, molybdenum and copper than 316L. Send process concentration, contaminants and temperature; we quote 904L where the reducing-acid or chloride condition justifies the premium.
What to send for quotation
Send the governing material standard, thickness and width, cut drawings, inspection document, supplementary corrosion or ultrasonic tests, surface condition and packing. We quote plate thickness against the source mill.
Quote welding and substitution
Send the qualified procedure and compatible over-alloyed consumables. An equivalent grade is quoted only after chemistry, mechanical properties, product standard, heat treatment and project approval are in the RFQ.
Common ordering mistakes
- Selecting 904L from a generic corrosion chart without accounting for concentration, temperature, aeration, contaminants and operating transients.
- Treating European and UNS designations as automatic substitutes without checking the ordered standard and project acceptance.
- Requesting an unspecified corrosion test that cannot be priced or tied to a meaningful acceptance criterion.
- Omitting cut-part yield, remnant disposition and traceability from a high-value plate nesting order.
Handling and transport risks
- Loss of heat identity on cut parts creates disproportionate commercial and quality risk because visual sorting cannot confirm 904L.
- Cross-contamination from carbon steel or lower-alloy stainless tools can compromise the prepared surface and later show staining.
- Heavy irregular cut parts need lifting points, edge protection and separation planned to avoid impact damage or unsafe handling.
- Extended sourcing and transport routes make moisture control, document reconciliation and marking protection especially important.
Technical content updated: 2026-07-31
Published by Tsingshan (Shandong) Iron & Steel Co., Ltd..Sources, update policy and technical limitations.
Typical Applications
Related technical resources
Grades
Published standards
Applicable standards
ASTM A240/A240M · EN 10088
What to Include in Your RFQ
Send the known values first. We use them to quote the ordered option, inspection plan and delivery route.
- Grade and governing standard
- 904L; ASTM A240/A240M, EN 10088. State the exact ordered combination.
- Dimensions and tolerances
- Provide thickness and identify which order basis, special tolerances requirements govern acceptance.
- Finish, processing and edge or end condition
- No.1; Stainless Steel Cut-to-Length and Leveling, Stainless Steel Laser Cutting, Stainless Steel Polishing and Surface Finishing; Edge, end or facing condition as ordered from the product form, standard and fabrication need..
- Inspection, documents and packing
- Testing: Tests required by the purchased product standard.; PMI, NDE, corrosion, roughness or other supplementary inspection quoted when the RFQ names method, lot scope and acceptance. Documents: Heat identity with EN 10204 3.1, or the inspection document named in the RFQ, against mill, stock or partner-mill route.; Supplementary reports linked to the ordered test plan. Packing: Sheets interleaved and film-wrapped where the finish needs it, strapped on export skids.; Moisture protection selected for the sea route; packing method stated in the quotation.
- Quantity, destination and requested delivery window
- Send quantity per size, unit, destination city or port, trade term and requested delivery window so we can quote the supply and freight route.
Product RFQ Example
RFQ example: ASTM A240 UNS N08904 plate, solution annealed and pickled, 12 x 1500 x 3000 mm, six plates plus attached cut drawings, project corrosion-service data supplied for review, heat-number transfer, ordered inspection document, PMI and named supplementary test procedure, bevel and packing requirements, delivery to the specified port.
Frequently Asked Questions
Is 904L always better than 316L in sulfuric acid?
No grade is universally better. Concentration, temperature, aeration, impurities, flow, deposits and upset conditions all matter. Use project corrosion data and responsible materials approval.
Are UNS N08904 and EN 1.4539 automatically interchangeable?
They are common cross-references, not automatic purchase substitutes. Check chemistry, mechanical requirements, product form, condition, edition and project approval under the ordered standard.
What corrosion-test information belongs in a 904L plate RFQ?
Name the method, specimen source and preparation, test environment, temperature, duration, acceptance criterion, witness point and report requirement. An open request for corrosion testing is not sufficient.
How should 904L cut parts retain material identity?
Define the parent-plate map, unique part marks, transfer method, remnant handling and inspection records before nesting and cutting begin.
Why does the welding plan matter before ordering 904L plate?
Joint design, filler selection, qualified procedure, dilution, heat input and final cleaning can affect corrosion performance and cut geometry. They also influence bevel and traceability requirements in the plate order.
Quote request
Get a Stainless Steel Quote
Send the product, grade and quantity you already have. We will complete the specification and quote the supply route.