444 vs 316L Stainless Steel
Side-by-side comparison · Composition · Properties · Selection guide
Ferritic 444 matches 316L's headline number — both carry ~2% molybdenum and land near PREN 24–26 — without any nickel. It is immune to chloride stress-corrosion cracking, the classic hot-water failure of austenitics, and its price is lower and steadier. 316L answers with ductility, thick-section availability and universal acceptance.
Full datasheets:444 Stainless Steel·316L Stainless Steel
At a Glance
| 444 | 316L | |
|---|---|---|
| Type | Ferritic (Mo-bearing) | Austenitic (low carbon, Mo-bearing) |
| UNS | S44400 | S31603 |
| Standard | ASTM A240/A240M | ASTM A240/A240M |
| Density | 7.75 g/cm³ | 7.98 g/cm³ |
Corrosion Resistance and Service Limits
444
- Ferritic grades resist chloride stress-corrosion cracking better than common austenitic grades, while pitting resistance still depends on chromium, molybdenum and exposure.
- Weld condition, section thickness, crevices, deposits and surface contamination can control service performance; validate the actual fabrication and environment.
316L
- General corrosion resistance comes from the chromium-rich passive film; nickel, molybdenum, nitrogen and copper change performance by grade.
- Check chlorides, temperature, crevices, deposits, process chemistry and cleaning conditions. A grade designation alone is not a service-life guarantee.
Fabrication and Heat Treatment
| Operation | 444 | 316L |
|---|---|---|
| Welding | Control heat input, interpass temperature and joint design to limit grain growth and loss of toughness; stabilized grades improve but do not remove these controls. | Generally weldable with a qualified procedure and matching or over-alloyed filler where required; remove heat tint when corrosion service demands it. |
| Forming | Formability is useful in sheet gauges but lower than common austenitic grades, especially in heavy sections and severe draws. | Good ductility is typical, but rapid work hardening increases forming load and springback; bend radius and intermediate annealing depend on grade and reduction. |
| Machining | Machining is generally straightforward with rigid tooling; avoid smearing, overheating and iron contamination of finished surfaces. | Use rigid tooling, positive feeds and controlled heat because the material work-hardens; free-machining grades require separate corrosion and welding review. |
| Heat treatment | Ferritic grades are not hardened by heat treatment. Annealing can restore ductility, but the temperature and cooling route must follow the product specification. | Solution annealing and rapid cooling restore the intended condition where applicable. Austenitic grades are not hardened by conventional quench-and-temper treatment. |
Chemical Composition (wt%)
| Element | 444 | 316L |
|---|---|---|
| C | ≤0.025 | ≤0.030 |
| Mn | ≤1.00 | ≤2.00 |
| Si | ≤1.00 | ≤0.75 |
| Cr | 17.5–19.5 | 16.0–18.0 |
| Mo | 1.75–2.50 | 2.00–3.00 |
| Ni | ≤1.00 | 10.0–14.0 |
| Ti+Nb | 0.20+4×(C+N)–0.80 | — |
| N | ≤0.035 | — |
| P | ≤0.040 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
Mechanical Properties
| Property | 444 | 316L |
|---|---|---|
| Tensile strength | ≥415 MPa (60 ksi) | ≥485 MPa (70 ksi) |
| Yield strength (0.2%) | ≥275 MPa (40 ksi) | ≥170 MPa (25 ksi) |
| Elongation (50 mm) | ≥20% | ≥40% |
| Hardness | ≤217 HBW | ≤217 HBW |
Which One Should You Choose?
Choose 444 for:
- Hot-water tanks and electric water heaters
- Solar thermal collectors and plate heat exchangers
- Thin-gauge welded tube in chloride-bearing water
- Nickel-price-hedged OEM production
Choose 316L for:
- Plate above ~3 mm and structural sections
- Deep drawing and demanding cold forming
- Cryogenic or sub-zero applications
- Projects standardized on austenitic welding practice
Our verdict
Inside its envelope — sheet and tube up to ~3 mm in warm water service — 444 is arguably the better engineering choice: same pitting resistance, zero SCC risk, lower cost. Outside it, ferritic limits (toughness in thick sections, forming, weld ductility) hand the job back to 316L.
Cost and Availability
Compare the current stock position, mill route, minimum production quantity, processing yield, testing and delivered cost for 444 and 316L at quotation time. A fixed price ratio would be misleading because product form, size, condition and market timing can change the commercial result.
Do Not Substitute Without Review
Do not replace 444 with 316L, or the reverse, from the grade name alone. Recheck chemistry, mechanical-property condition, product standard, dimensions, corrosion environment, welding procedure and project approval before substitution.
444 & 316L Products We Export
316L Stainless Steel Sheet
316/316L stainless steel sheet for marine and chemical service, in quotation-confirmed dimensions in 2B, BA and brushed finishes, cut to size, with ordered documentation.
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316L Stainless Steel Seamless Pipe
Seamless 316L stainless steel pipe to ASTM A312, in quotation-confirmed NPS and schedule, pickled and annealed, with ordered documentation — for chemical, marine and process service.
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Frequently Asked Questions
If 444 equals 316L in pitting resistance, why isn't it everywhere?
Product form limits: ferritics lose toughness in heavy gauges, so 444 lives in sheet and thin tube. Add conservative specs and fabricator familiarity with austenitics, and 316L keeps the general market while 444 dominates niches like water heaters.
Is 444 magnetic?
Yes, strongly — it is ferritic. That has no bearing on corrosion performance and is even used to advantage for induction heating of water-heater tanks.
Can 444 be used at low temperature?
Ferritic toughness depends strongly on thickness, grain size and temperature. Cryogenic or impact-critical service normally favors austenitic 316L unless testing and design approval support 444.
RFQ
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Technical content updated: 2026-07-29
Organizational author: Tsingshan (Shandong) Iron & Steel Co., Ltd..Review method, status and limitations.