Stainless Steel N08700
UNS N08700 · ASTM A240/B599
N08700 (JS700) is a low-carbon, niobium-stabilized superaustenitic stainless — an improved Alloy 20 with about 2.5% molybdenum and higher nickel — covered by ASTM A240 and B599.
Reference datasheet — N08700 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 condition
N08700 tempers and conditions
N08700 is supplied in 5 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
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 |
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?
N08700 (JS700) is a low-carbon, niobium-stabilized superaustenitic stainless — an improved Alloy 20 with about 2.5% molybdenum and higher nickel — covered by ASTM A240 and B599. It is used for sulfuric and phosphoric acid service where weld sensitization must be avoided, in plate, sheet, pipe, bar and wire, including cold-drawn and spring tempers; annealed material gives 275 MPa yield, 585 MPa tensile and 45% elongation. Service is limited to about 500 °C and the alloy work-hardens quickly in both machining and forming. Alloy 20 (N08020) is the lower-cost alternative. N08700 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). N08700 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
What is N08700 used for?
- sulfuric/phosphoric acid equipment
- chemical process piping
- fertilizer production equipment
- pickling equipment
Advantages
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Forms and bends easily — 72/100, better than 84% of stainless steel grades
- Good corrosion resistance — 74/100, better than 78% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Low strength — 275 MPa (39.9 ksi), worse than 77% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
N08700 properties
Typical room-temperature values for N08700-Annealed; bars are the position among stainless steel grades.
Physical3
N08700 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 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
N08700 is rated for continuous service to 500°C (932 °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 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 78% of stainless steel grades.
Sustainability4
Producing a kilogram of N08700 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's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (72/100); formability very good (72/100).
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. N08700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N08700
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.
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 |
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.
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
Equivalent designations
Standards and trade names that resolve to Stainless Steel N08700 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A240/B599
- Trade names
- JS700
How much does N08700 cost?
N08700 is a high-cost stainless steel ($$$$), pricier than about 78% 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.
N08700 — frequently asked
What is N08700 used for?
N08700 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?
N08700 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — weaker than 77% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is N08700 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% 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 be welded?
Yes — weldability is rated very good (72/100). 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?
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 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?
N08700 is rated for continuous use to about 500°C (932 °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.
How much does N08700 cost?
N08700 is a high-cost stainless steel ($$$$), pricier than about 78% 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
- 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; 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.