Stainless Steel SUS890L 1/2H
Supply condition
JIS SUS890L · UNS S31254
1/2H = half hard
Higher-strength strip/wire for springs, clamps and stressed components in corrosive service.
Values for the 1/2H condition
Other SUS890L tempers and conditions
SUS890L is listed in 3 conditions; see the grade overview at SUS890L.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault Annealed (solution treated ~1100–1150 °C, water quenched) | Standard stocked condition for plate, sheet, tube and bar — maximum corrosion resistance and ductility. | 260 | 590 | 45 | 160 HB | 1.7 % IACS |
Quarter hard | Light cold work when higher yield strength is needed but some forming ductility must remain. | 520 | 760 | 22 | 22 HRC | 1.7 % IACS |
1/2HThis page Half hard | Higher-strength strip/wire for springs, clamps and stressed components in corrosive service. | 700 | 900 | 14 | 28 HRC | 1.7 % IACS |
What is SUS890L 1/2H?
SUS890L 1/2H is SUS890L supplied in the 1/2H condition — higher-strength strip/wire for springs, clamps and stressed components in corrosive service. SUS890L 1/2H has a yield strength of 700 MPa (102 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 195 GPa (28.3 Msi). SUS890L 1/2H has a density of 7.98 g/cm³ (0.288 lb/in³), heavier than 85% of stainless steel grades. It melts at 1,320°C (2,408 °F). Annealed is the default condition FabDigit quotes; 1/2H is available on request or by drawing note.
Advantages
- High strength — 700 MPa (102 ksi), better than 92% of stainless steel grades
- Good corrosion resistance — 84/100, better than 91% of stainless steel grades
Limitations
- Poor heat conductor — 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Limited ductility — 14%, worse than 91% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
SUS890L 1/2H properties
Typical room-temperature values for SUS890L 1/2H; 23 are specific to this condition. Other listed values are SUS890L reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
SUS890L 1/2H has a density of 7.98 g/cm³ (0.288 lb/in³), heavier than 85% of stainless steel grades. It melts at 1,320°C (2,408 °F).
Mechanical16
SUS890L 1/2H has a yield strength of 700 MPa (102 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 14% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
SUS890L 1/2H is rated for continuous service to 300°C (572 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), worse than 93% of stainless steel grades. Thermal expansion is 15.3 µm/m·K (8.5 µin/in·°F).
Electrical3
SUS890L 1/2H conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (84/100), better than 91% of stainless steel grades.
Sustainability4
Producing a kilogram of SUS890L 1/2H takes about 68 MJ of energy and emits 5.6 kg of CO₂ — more than 80% of stainless steel grades. Typical recycled content is 45%.
Manufacturability8
SUS890L 1/2H's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (65/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SUS890L 1/2H
Is SUS890L easy to machine?
Tough and gummy with strong work hardening — use rigid setups, positive-rake carbide, heavy feeds, low-to-moderate speed and copious high-lubricity coolant; never dwell in the cut.
Can SUS890L be welded?
Readily welded by GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3 / Alloy 625) to avoid Mo segregation; low heat input, no preheat, interpass < 150 °C, pickle and passivate afterwards.
Can SUS890L be formed, bent or molded?
Very ductile but requires ~50 % higher forming loads than 304; allow generous springback, avoid excessive cold work before highly corrosive service or re-anneal at 1100–1150 °C with rapid quench.
What surface finishes work on SUS890L?
Pickle (HNO₃/HF) or bead-blast then passivate per ASTM A967; electropolishing gives the smoothest, most corrosion-resistant surface for pharma and acid-handling equipment.
SUS890L 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 for weld corrosion resistance | ≤ 0.02 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 2 | 1.5 |
| P | ≤ 0.05 | 0.03 |
| S | ≤ 0.04 | 0 |
| Ni | 23 – 28 | 25 |
| Cr | 19 – 23 | 21 |
| Mo | 4 – 5 | 4.5 |
| Cuimproves resistance in reducing acids | 1 – 2 | 1.5 |
| Fe | balance | — |
SUS890L 1/2H — frequently asked
What is SUS890L 1/2H used for?
SUS890L 1/2H is typically used for acid processing equipment, marine components and flue-gas desulfurization. In short: 904L-equivalent acid grade; high Ni-Mo corrosion resistance; costly, hard to machine.
What is the yield strength of SUS890L 1/2H?
SUS890L 1/2H has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 92% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is SUS890L 1/2H easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Tough and gummy with strong work hardening — use rigid setups, positive-rake carbide, heavy feeds, low-to-moderate speed and copious high-lubricity coolant; never dwell in the cut.
Can SUS890L 1/2H be welded?
Yes — weldability is rated good (65/100). Readily welded by GTAW/GMAW/SMAW with over-alloyed Ni-base filler (ERNiCrMo-3 / Alloy 625) to avoid Mo segregation; low heat input, no preheat, interpass < 150 °C, pickle and passivate afterwards.
What surface finishes work on SUS890L 1/2H?
Pickle (HNO₃/HF) or bead-blast then passivate per ASTM A967; electropolishing gives the smoothest, most corrosion-resistant surface for pharma and acid-handling equipment.
Can SUS890L 1/2H be formed, bent or molded?
Very ductile but requires ~50 % higher forming loads than 304; allow generous springback, avoid excessive cold work before highly corrosive service or re-anneal at 1100–1150 °C with rapid quench.
What is the maximum service temperature of SUS890L 1/2H?
SUS890L 1/2H 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 G 4304 / G 4305 — Hot and cold rolled stainless steel plate, sheet and strip — JSA (2021)
- ASTM B625 / ASME SB-625 — UNS N08904 plate, sheet and strip — ASTM (2020)
- Outokumpu 904L (EN 1.4539) datasheet — Outokumpu (2023)
- Sandvik 2RK65 / Alleima 904L tube datasheet — Alleima (Sandvik Materials Technology) (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
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.