Stainless Steel N08700 Spring
Heat-treated state
UNS N08700 · ASTM A240/B599
Spring = spring hard
Heavily drawn wire for corrosion-resistant springs and mesh in acid service.
Values for the Spring condition
Other N08700 tempers and conditions
N08700 is listed in 5 conditions; see the grade overview at N08700.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault solution annealed ~1010–1120 °C, rapid quenched | Standard supply condition for plate, sheet, strip, pipe and bar in corrosive acid service. | 275 | 585 | 45 | 160 HB | — |
As-welded deposit | Nb-stabilized chemistry lets weldments be used without post-weld solution annealing in most acid service. | 300 | 570 | 35 | 175 HB | 1.7 % IACS |
1/4 Hard | Light temper rolling for springy strip, shims and higher-strength thin sections. | 450 | 690 | 28 | 14 HRC | 1.7 % IACS |
Cold drawn | Pick for straight, close-tolerance bar and fasteners where higher yield strength is needed. | 550 | 760 | 25 | 17 HRC | 1.7 % IACS |
SpringThis page Spring hard | Heavily drawn wire for corrosion-resistant springs and mesh in acid service. | 1,000 | 1,200 | 5 | 38 HRC | 1.7 % IACS |
What is N08700 Spring?
N08700 Spring is N08700 heat treated to Spring — heavily drawn wire for corrosion-resistant springs and mesh in acid service. N08700 Spring has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 5% and the elastic modulus is 195 GPa (28.3 Msi). N08700 Spring has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F). Annealed is the default condition FabDigit quotes; Spring is available on request or by drawing note.
Advantages
- High strength — 1,000 MPa (145 ksi), better than 98% of stainless steel grades
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
Limitations
- Limited ductility — 5%, worse than 100% of stainless steel grades
- Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
N08700 Spring properties
Typical room-temperature values for N08700 Spring; 22 are specific to this condition. Other listed values are N08700 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08700 Spring has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical15
N08700 Spring has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 98% of stainless steel grades. Elongation at break is 5% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
N08700 Spring is rated for continuous service to 250°C (482 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 14.8 µm/m·K (8.22 µin/in·°F).
Electrical3
N08700 Spring conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 68% of stainless steel grades.
Sustainability4
Producing a kilogram of N08700 Spring takes about 75 MJ of energy and emits 5.5 kg of CO₂ — more than 84% of stainless steel grades. Typical recycled content is 40%.
Manufacturability8
N08700 Spring's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability fair (45/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08700 Spring
Is N08700 easy to machine?
Cut like a nickel alloy: rigid setup, positive-rake sharp carbide, low speed with heavy feed and flood coolant to avoid rubbing and work-hardened skin.
Can N08700 be welded?
Readily welded by GTAW/GMAW/SMAW with Nb-stabilized matching or Ni-base (e.g. NiCrMo) filler, low heat input, no preheat, interpass below ~150 °C; post-weld anneal usually unnecessary.
Can N08700 be formed, bent or molded?
Cold forms well but work-hardens fast — allow extra power, generous radii and interstage annealing at 1010–1120 °C with rapid cooling; hot work 1150–900 °C then quench.
What surface finishes work on N08700?
Pickle in HNO3-HF and passivate per ASTM A967 after hot work or welding; electropolishing gives the best acid-service surface. Anodizing is not applicable.
N08700 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-decay resistance | ≤ 0.04 | 0.02 |
| Mn | ≤ 2 | 1 |
| Si | ≤ 1 | 0.5 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Cr | 19 – 23 | 21 |
| Ni | 24 – 26 | 25 |
| Mo | 4.3 – 5 | 4.6 |
| Cu | ≤ 0.5 | 0.3 |
| Nb8×C minimum; Cb stabilization | ≤ 0.4 | 0.25 |
| Febalance, ≈44% | balance | — |
N08700 Spring — frequently asked
What is N08700 Spring used for?
N08700 Spring is typically used for sulfuric/phosphoric acid equipment, chemical process piping, fertilizer production equipment and pickling equipment. In short: low-carbon improved Alloy 20; sensitization-resistant weld zone; good acid-service formability.
What is the yield strength of N08700 Spring?
N08700 Spring has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,200 MPa (174 ksi) — stronger than 98% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is N08700 Spring easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Cut like a nickel alloy: rigid setup, positive-rake sharp carbide, low speed with heavy feed and flood coolant to avoid rubbing and work-hardened skin.
Can N08700 Spring be welded?
With care — weldability is rated fair (45/100). Readily welded by GTAW/GMAW/SMAW with Nb-stabilized matching or Ni-base (e.g. NiCrMo) filler, low heat input, no preheat, interpass below ~150 °C; post-weld anneal usually unnecessary.
What surface finishes work on N08700 Spring?
Pickle in HNO3-HF and passivate per ASTM A967 after hot work or welding; electropolishing gives the best acid-service surface. Anodizing is not applicable.
Can N08700 Spring be formed, bent or molded?
Cold forms well but work-hardens fast — allow extra power, generous radii and interstage annealing at 1010–1120 °C with rapid cooling; hot work 1150–900 °C then quench.
What is the maximum service temperature of N08700 Spring?
N08700 Spring is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N08700 Annealed and N08700 Spring?
Annealed is the default condition — standard supply condition for plate, sheet, strip, pipe and bar in corrosive acid service. Spring: heavily drawn wire for corrosion-resistant springs and mesh in acid service. Yield strength is 275 MPa in Annealed versus 1,000 MPa in Spring.
Sources
- ASTM B599 — Ni-Fe-Cr-Mo-Cb Stabilized Alloy (UNS N08700) Plate, Sheet and Strip — ASTM International (2020)
- ASTM B672 — UNS N08700 Bar and Wire — ASTM International (2019)
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- JS700 / Alloy 20 family superaustenitic alloy datasheets — specialty alloy producers (2022)
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.