Stainless Steel SUS443J1 1/4H
Supply condition
JIS SUS443J1
1/4H = quarter hard
Lightly cold-rolled strip for flat springs, clips and stiffness-critical thin parts; reduced ductility, order to specification.
Values for the 1/4H condition
Other SUS443J1 tempers and conditions
SUS443J1 is listed in 4 conditions; see the grade overview at SUS443J1.
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 |
1/4HThis page 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 |
What is SUS443J1 1/4H?
SUS443J1 1/4H is SUS443J1 supplied in the 1/4H condition — lightly cold-rolled strip for flat springs, clips and stiffness-critical thin parts; reduced ductility, order to specification. SUS443J1 1/4H has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 200 GPa (29 Msi). SUS443J1 1/4H 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). Annealed-2B is the default condition FabDigit quotes; 1/4H is available on request or by drawing note.
Advantages
- Easy to machine — 50/100, better than 90% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% 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
- Limited ductility — 14%, worse than 91% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 83% of stainless steel grades
SUS443J1 1/4H properties
Typical room-temperature values for SUS443J1 1/4H; 22 are specific to this condition. Other listed values are SUS443J1 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
SUS443J1 1/4H 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 1/4H has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
SUS443J1 1/4H is rated for continuous service to 300°C (572 °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 1/4H conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 58% of stainless steel grades.
Sustainability4
Producing a kilogram of SUS443J1 1/4H 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 1/4H's machinability is fair (50/100, better than 90% of stainless steel grades); weldability very good (70/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SUS443J1 1/4H
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.
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.
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 | — |
SUS443J1 1/4H — frequently asked
What is SUS443J1 1/4H used for?
SUS443J1 1/4H 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 1/4H?
SUS443J1 1/4H has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 560 MPa (81.2 ksi) — stronger than 70% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is SUS443J1 1/4H easy to machine?
Reasonably — machinability is rated fair (50/100, better than 90% 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 1/4H be welded?
Yes — weldability is rated very good (70/100). 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 1/4H?
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 1/4H 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 1/4H?
SUS443J1 1/4H is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.