Stainless Steel SUS443J1
JIS SUS443J1
High-chromium (~21%) Mo/Cu-modified ferritic stainless developed in Japan for excellent pitting and crevice corrosion resistance approaching 316, used where austenitic-level corrosion performance is needed at lower cost.
Reference datasheet — SUS443J1 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the Annealed-2B condition
SUS443J1 tempers and conditions
SUS443J1 is supplied in 4 conditions, soft to hard. Annealed-2B is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled, annealed and pickled (No.1) plate/strip | Heavier gauge hot band for tanks and weldments where surface finish is secondary. | 285 | 455 | 28 | 157 HB | 2.9 % IACS |
Bright annealed (BA) cold rolled sheet | Hydrogen bright-annealed mirror-like surface — pick for appearance parts and best as-delivered corrosion performance. | 290 | 460 | 31 | 158 HB | 2.9 % IACS |
Annealed-2BDefault Annealed, cold rolled No.2B finish | Standard stocked condition for cold-rolled coil/sheet: annealed, pickled, skin-passed — pick for general forming and corrosion service. | 300 | 470 | 30 | 163 HB | 2.9 % IACS |
Quarter hard | Lightly cold-rolled strip for flat springs, clips and stiffness-critical thin parts; reduced ductility, order to specification. | 450 | 560 | 14 | 17 HRC | 2.9 % IACS |
Supply forms, finishes and certifications
Ways SUS443J1 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Annealed-Bar | Annealed bar / rod | Supply form |
No.4 | Annealed + No.4 abrasive-belt polished sheet | Surface finish |
What is SUS443J1?
High-chromium (~21%) Mo/Cu-modified ferritic stainless developed in Japan for excellent pitting and crevice corrosion resistance approaching 316, used where austenitic-level corrosion performance is needed at lower cost. SUS443J1 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F). SUS443J1 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is SUS443J1 used for?
- hot water tanks and heaters
- bathroom and kitchen fixtures
- marine hardware
- food processing equipment
Advantages
- Easy to machine — 55/100, better than 94% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- High service temperature — 900°C (1,652 °F), better than 85% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
- Conducts heat well — 23 W/m·K (13.3 BTU/hr·ft·°F), better than 78% of stainless steel grades
Limitations
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 83% of stainless steel grades
SUS443J1 properties
Typical room-temperature values for SUS443J1-Annealed-2B; bars are the position among stainless steel grades.
Physical3
SUS443J1 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical16
SUS443J1 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
SUS443J1 is rated for continuous service to 900°C (1,652 °F). It conducts heat at 23 W/m·K (13.3 BTU/hr·ft·°F), better than 78% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
SUS443J1 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of SUS443J1 takes about 52 MJ of energy and emits 3.6 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
SUS443J1's machinability is good (55/100, better than 94% of stainless steel grades); weldability very good (72/100); formability good (68/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. SUS443J1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with SUS443J1
Is SUS443J1 easy to machine?
Machines like 430 — better chip breaking and lower work hardening than 304; use rigid setups, sharp carbide, positive rake and generous coolant to avoid built-up edge.
Can SUS443J1 be welded?
Dual Ti/Nb stabilization prevents sensitization, so no post-weld anneal is needed; keep heat input and interpass temperature low to limit HAZ grain coarsening, use 316L/309L or matching-Nb filler and full inert backing.
Can SUS443J1 be formed, bent or molded?
Good bending and moderate deep drawing (r̄ ≈ 1.5–1.8) with much less springback and no delayed cracking versus 304; watch for ridging/roping on high-polish exterior panels and avoid very sharp bend radii below 1t.
SUS443J1 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Clow carbon, dual stabilized | ≤ 0.03 | 0.01 |
| Si | ≤ 1 | 0.35 |
| Mn | ≤ 1 | 0.35 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.03 | 0 |
| Niresidual | ≤ 0.6 | 0.2 |
| Cr | 20.5 – 22.5 | 21 |
| Cuimproves acid/crevice resistance | 0.3 – 0.8 | 0.45 |
| N | ≤ 0.03 | 0.01 |
| TiTi+Nb+Zr total = 8×(C+N) min to 0.80 max | ≤ 0.8 | 0.15 |
| Nbpart of the combined stabilizer requirement | ≤ 0.8 | 0.25 |
| Zroptional stabilizer, counted in the Ti+Nb+Zr sum | ≤ 0.8 | |
| Fe | balance |
What surface finishes work on SUS443J1?
Passivate (citric or nitric per ASTM A967) after machining or grinding; BA and No.4 finishes are supplied mill-ready, and electropolishing further raises pitting resistance. Not anodizable.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
How much does SUS443J1 cost?
SUS443J1 is a standard-cost stainless steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
SUS443J1 — frequently asked
What is SUS443J1 used for?
SUS443J1 is typically used for hot water tanks and heaters, bathroom and kitchen fixtures, marine hardware and food processing equipment. In short: nickel-free 316 alternative; best-corrosion ferritic grade; no post-weld anneal needed.
What is the yield strength of SUS443J1?
SUS443J1 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 68% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is SUS443J1 easy to machine?
Reasonably — machinability is rated good (55/100, better than 94% of stainless steel grades). Machines like 430 — better chip breaking and lower work hardening than 304; use rigid setups, sharp carbide, positive rake and generous coolant to avoid built-up edge.
Can SUS443J1 be welded?
Yes — weldability is rated very good (72/100). Dual Ti/Nb stabilization prevents sensitization, so no post-weld anneal is needed; keep heat input and interpass temperature low to limit HAZ grain coarsening, use 316L/309L or matching-Nb filler and full inert backing.
What surface finishes work on SUS443J1?
Passivate (citric or nitric per ASTM A967) after machining or grinding; BA and No.4 finishes are supplied mill-ready, and electropolishing further raises pitting resistance. Not anodizable.
Can SUS443J1 be formed, bent or molded?
Good bending and moderate deep drawing (r̄ ≈ 1.5–1.8) with much less springback and no delayed cracking versus 304; watch for ridging/roping on high-polish exterior panels and avoid very sharp bend radii below 1t.
What is the maximum service temperature of SUS443J1?
SUS443J1 is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does SUS443J1 cost?
SUS443J1 is a standard-cost stainless steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- JIS G4305 — Cold-rolled stainless steel plate, sheet and strip — JSA (2021)
- JIS G4304 — Hot-rolled stainless steel plate, sheet and strip — JSA (2021)
- EN 10088-2 (1.4621, X2CrTiNbCu21) — CEN (2014)
- High-chromium Cu-bearing ferritic stainless sheet (443CT / NSSC 443 class) — JFE Steel / Nippon Steel Stainless (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- UNS S44330 alloy data — SAE/ASTM UNS (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.