Grade quotation brief
304 vs 316 Stainless Steel
Quote 304 when indoor, dry or low-chloride duty is already approved. Quote 316 when chlorides, deposits or crevices have been reviewed as a molybdenum upgrade. Neither grade is seawater approval or a stated service life. Send product form, temperature, finish and welding with the RFQ so we can quote the designated route.
Quote 304 for controlled, lower-chloride indoor or inland duty already approved by the project. Quote 316 when localized-corrosion margin from molybdenum is specified for chlorides, deposits or crevices. Neither designation approves seawater or a service life. Send chloride, temperature, product form, finish and tests with the RFQ.
Unsure whether 304 or 316 matches the operating temperature and chemistry? Send the service conditions with the RFQ. We quote the approved designation, product form and test plan.
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Illustrations identify the compared grade references; they are not photographs of the quoted material or proof of a mill heat.
Decision matrix
Key Differences
Full grade sheets:304 Stainless Steel/316 Stainless Steel
| Factor | 304 | 316 | Procurement decision |
|---|---|---|---|
| Chemistry | 304 is an austenitic chromium-nickel grade without a specified molybdenum range in the displayed ASTM A240 summary. | 316 is an austenitic chromium-nickel grade with a displayed molybdenum range of 2.00-3.00 percent. | Treat molybdenum as added localized-corrosion margin, not as universal approval for a chloride environment. |
| Localized corrosion | 304 can be screened for controlled lower-chloride exposure when temperature, drainage, finish and cleaning are defined. | 316 is commonly evaluated where chloride pitting or crevice corrosion makes the margin of 304 insufficient. | Provide chloride concentration, temperature, deposits and crevice geometry before either grade is approved. |
| Fabrication | 304 fabrication depends on delivery condition, thickness, forming severity, welding procedure and post-weld cleaning. | 316 uses related austenitic practices, but filler, heat input, surface restoration and service chemistry still require qualification. | Do not infer interchangeable procedures; qualify the delivered product and joint for the governing specification. |
| Procurement | 304 availability and quotation depend on product form, dimensions, finish, inspection and the current mill route. | 316 quotation also reflects molybdenum-bearing alloy input, form, dimensions, testing, processing and delivery route. | Compare like-for-like quotations on one dated RFQ instead of publishing a fixed grade premium. |
Service and production route
Corrosion and Fabrication Boundaries
304 corrosion screening
- For this 304 vs 316 review, 304 relies on a chromium-rich passive film for general atmospheric, indoor and many process duties, but it is not automatically suitable for warm chloride, coastal salt deposits or persistent crevice-prone service — 316/316L or a higher alloy may be needed.
- For this 304 vs 316 review, Against lower-nickel 201, annealed 304 usually offers more corrosion margin in humidity, outdoor wetting and chemically cleaned food-contact duty; against ferritic 430 it remains the more formable, weldable austenitic default when magnetism and deep drawing matter.
- For this 304 vs 316 review, Review chlorides, temperature, pH, deposits, crevices, drainage, cleaning chemistry, weld heat tint and surface finish for the actual component. A grade designation alone is not a service-life guarantee.
316 corrosion screening
- For this 304 vs 316 review, The specified molybdenum range gives 316 a higher localized-corrosion margin than 304 in many chloride exposures, but it does not make 316 a universal seawater or chemical-service grade.
- For this 304 vs 316 review, Assess chloride concentration, temperature, pH, deposits, crevices, wet-dry cycling, weld condition, finish and cleaning practice for the actual equipment.
| Operation | 304 | 316 |
|---|---|---|
| Welding | Generally weldable with a qualified austenitic procedure, matching or over-alloyed filler where required, controlled heat input and heat-tint removal when corrosion service demands it. For as-welded heavy sections, prefer 304L or dual-certified material meeting the low-carbon limit rather than assuming standard 304 HAZ behavior. | Use a qualified austenitic procedure that controls filler, purge, heat input, distortion and heat-tint removal; standard-carbon 316 also requires review of section and sensitization exposure. |
| Forming | Annealed 304 sheet and strip draw and bend well, but the alloy work-hardens during forming — tooling load, springback, bend direction, draw ratio and any intermediate anneal must be proven on the actual gauge and reduction route. | 316 is formable in the annealed condition and work-hardens during reduction, so tooling load, springback, bend direction, draw severity and any intermediate anneal must suit the actual gauge. |
| Machining | Use rigid tooling, positive feeds and controlled cutting heat to avoid a work-hardened surface; qualify the route on the delivered condition. Free-machining sulfur grades (for example 303) require separate corrosion and welding review. | Rigid tooling, positive feed and controlled heat help avoid rubbing into a work-hardened surface; qualify speed, tool geometry, coolant and allowance on the delivered section. |
| Heat treatment | Solution annealing with rapid cooling restores the intended annealed austenitic condition after suitable cold work or fabrication where applicable. Conventional quench-and-temper treatment does not through-harden austenitic 304. | Solution annealing with rapid cooling establishes the intended austenitic condition where applicable. 316 is not hardened by conventional quench-and-temper treatment. |
Reference data
Composition and Mechanical Requirements
Values below come from each grade's displayed reference dataset. Product form, thickness, condition and contracted standard can change the applicable acceptance table.
Chemical composition (wt%)
| Element | 304 | 316 |
|---|---|---|
| C | ≤0.08 | ≤0.08 |
| Mn | ≤2.00 | ≤2.00 |
| Si | ≤0.75 | ≤0.75 |
| Cr | 17.5–19.5 | 16.0–18.0 |
| Ni | 8.0–10.5 | 10.0–14.0 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
| N | ≤0.10 | - |
| Mo | - | 2.00–3.00 |
Mechanical properties
| Property | 304 | 316 |
|---|---|---|
| Tensile strength | ≥515 MPa (75 ksi) | ≥515 MPa (75 ksi) |
| Yield strength (0.2%) | ≥205 MPa (30 ksi) | ≥205 MPa (30 ksi) |
| Elongation (50 mm) | ≥40% | ≥40% |
| Hardness | ≤201 HBW | ≤217 HBW |
Quotation workflow
Application Decisions
- For indoor food or general fabrication, screen 304 only after cleaning chemistry, retained salts, drainage and finish acceptance are defined.
- For coastal architecture or marine hardware, evaluate 316 together with direct salt exposure, crevices, cleaning access and cosmetic acceptance criteria.
- For chemical or water-treatment equipment, provide normal, cleaning, shutdown and upset chemistry rather than selecting from an industry label.
- For welded pressure or hygienic systems, separately decide whether the low-carbon 304L or 316L designation is required by the code or project specification.
Quote 304 when
- Indoor kitchens, food processing, appliances and furniture with controlled chloride and cleaning
- Inland architecture away from coastal salt
- Water tanks and plumbing with documented low chloride
- Projects whose material specification already names 304
Quote 316 when
- Coastal or marine exposure, including sea-front architecture, after project corrosion review
- Chemical, pharmaceutical and pulp equipment specified for molybdenum-bearing austenitic
- Swimming-pool surrounds and de-icing salt named in the RFQ
- Recurring chloride pitting or tea-staining reviewed as a 316 upgrade
Hold point
Do Not Substitute Without Review
- Do not deliver 304 against an order for 316 unless the buyer's authorized material reviewer approves a documented deviation before manufacture.
- Do not treat 316 as sufficient for seawater, warm brine or every chloride process without environment-specific corrosion and design review.
- Do not transfer ASTM A240 flat-product values to pipe, tube, bar, fittings or forgings without applying the standard for that product form.
- Do not accept visual appearance, magnet response or an unverified label as positive grade identification; retain heat traceability and the required inspection document.
Specification boundary
Standards, Temperature and Approval
Product and project approval
ASTM A240/A240M can govern plate, sheet and strip, while pipe, tube, bar, fittings and forgings use other material and dimensional standards. The current contract edition, design code, product form, project specification and authorized material reviewer control acceptance; this comparison is procurement guidance, not engineering approval.
Temperature boundary
No single temperature limit on this page approves 304 or 316 for service. Temperature changes corrosion kinetics, chloride concentration during evaporation, cleaning severity and stress-corrosion risk; the design code, process data, exposure testing and project engineer must set the permitted range.
Commercial comparison
Cost and Availability Factors
Quote 304 and 316 on one RFQ with the same product form, dimensions, tests and documents. This page does not represent current stock, price or lead time.
Cost factors
- Current alloy inputs and mill extras for the specified 304 or 316 heat and product form.
- Dimensions, tolerances, finish, edge, processing yield and any critical-face acceptance sample.
- Testing, inspection document, PMI, supplementary examination and third-party witness requirements.
- Order quantity, production route, packing, freight, Incoterm and requested delivery window.
Inputs for a like-for-like quotation
- Required grade designation, product form and governing material and dimensional standards.
- Dimensions, tolerances, quantity, delivery condition, finish and critical surface requirements.
- Chloride level, pH, operating and cleaning temperatures, deposits, crevices and wet-dry cycle.
- Fabrication route, weld procedure requirements, heat-tint removal, passivation and inspection plan.
- Inspection document, heat traceability, PMI or supplementary tests, destination and Incoterm.
Continue the specification
Related Grades, Standards and Applications
Grade references
Applications
304 Stainless Steel Sheet
304/304L ASTM A240 sheet in 2B, BA, No.4 and mirror. Common inquiry range 0.3–6.0 mm, 1000/1219/1500 mm widths, cut to size with quoted documents.
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304 Stainless Steel Welded Pipe
304 welded stainless steel pipe and tube to ASTM A312, A249 and A554 — industrial, sanitary and polished decorative, round, square and rectangular sections.
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304 Stainless Steel Round Bar
304/304L round bar in bright, peeled or hot-finished routes. Common inquiry range 3–300 mm diameter, 3 m / 6 m or cut-to-length, for pins, shafts and fittings.
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316L Stainless Steel Sheet
316/316L stainless sheet for chloride and chemical service in 2B, BA and brushed finishes. Common inquiry range 0.3–6.0 mm, 1000/1219/1500 mm, cut to size.
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Buyer questions
Frequently Asked Questions
Is 316 stronger than 304?
No. Both grades share the same minimum mechanical properties in ASTM A240 (515 MPa tensile, 205 MPa yield). The premium buys corrosion resistance, not strength — if you need more strength, look at duplex 2205 instead.
How much more expensive is 316 than 304?
There is no durable percentage. Nickel, molybdenum, product form, dimensions, finish, processing and freight all move the delivered difference, so compare quotations for the same specification and date.
Can you visually tell 304 from 316?
No — they look identical in every finish. Verification requires the mill test certificate or a PMI (positive material identification) test with an XRF gun, which reads the molybdenum content directly.
Published by Tsingshan (Shandong) Iron & Steel Co., Ltd..Sources, update policy and technical limitations.
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