Stainless Steel 1.3967
EN 1.3967
1.3967 (GX2CrNiMnMoNNb21-16-5-3) is a low-carbon, nitrogen- and niobium-alloyed cast austenitic stainless steel in the 21Cr-16Ni-5Mn-3Mo system, developed for components needing high mechanical strength together with good corrosion resistance.
Reference datasheet — 1.3967 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 AT condition
1.3967 tempers and conditions
1.3967 is supplied in 3 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATDefault Solution annealed (≈1050–1120 °C) and water quenched | Standard delivery condition for all castings: maximum corrosion resistance, fully austenitic and non-magnetic, good strength/ductility balance. | 380 | 690 | 32 | 220 HB | — |
hot isostatically pressed, then solution annealed and quenched | Choose for pressure-retaining or fatigue-critical castings where micro-shrinkage must be closed — higher ductility, toughness and fatigue life at same strength level. | 390 | 720 | 38 | 225 HB | 1.9 % IACS |
Spheroidize annealed | Only for rough stock or non-corrosive structural parts — interdendritic carbide/nitride segregation lowers ductility and pitting resistance; not a normal delivery condition. | 400 | 640 | 18 | 21 HRC | 1.9 % IACS |
What is 1.3967?
1.3967 (GX2CrNiMnMoNNb21-16-5-3) is a low-carbon, nitrogen- and niobium-alloyed cast austenitic stainless steel in the 21Cr-16Ni-5Mn-3Mo system, developed for components needing high mechanical strength together with good corrosion resistance. In the solution-annealed condition it gives 380 MPa yield, 690 MPa tensile, 32 % elongation, 220 HB (96 HRB) and a corrosion-resistance score of 78; it is supplied as sand or investment castings, often HIP + annealed for pressure-tight sections. Limits are poor machinability (score 25) from the heavily work-hardening high-nitrogen austenite, a service ceiling near 550 °C, and melt practice that must control nitrogen. Where the extra strength is not needed, 1.4408 (CF8M) is the cheaper alternative. 1.3967 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,370°C (2,498 °F). 1.3967 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 196 GPa (28.4 Msi).
What is 1.3967 used for?
- Pump casings and impellers
- Valve bodies and bonnets
- High-strength corrosion-resistant pressure castings
- Non-magnetic machinery castings
- HIP'd pressure-tight housings
- Chemical process fittings and manifolds
Advantages
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
Limitations
- Difficult to machine — 25/100, worse than 88% of stainless steel grades
- Low electrical conductivity — 1.9 % IACS, worse than 84% of stainless steel grades
1.3967 properties
Typical room-temperature values for 1.3967-AT; bars are the position among stainless steel grades.
Physical3
1.3967 has a density of 7.9 g/cm³ (0.285 lb/in³), heavier than 68% of stainless steel grades. It melts at 1,370°C (2,498 °F).
Mechanical16
1.3967 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 52% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 196 GPa (28.4 Msi).
Thermal6
1.3967 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
1.3967 conducts electricity at 1.9 % IACS, worse than 84% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.3967 takes about 57 MJ of energy and emits 4.6 kg of CO₂ — more than 62% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
1.3967's machinability is poor (25/100, worse than 88% of stainless steel grades); weldability good (65/100); formability fair (35/100).
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. 1.3967 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.3967
Is 1.3967 easy to machine?
Very difficult: heavy work hardening from the 0.4 % N austenite — use rigid setups, sharp positive-rake carbide/ceramic tools, low speed (30–60 m/min), heavy positive feed and copious high-pressure coolant; never dwell or rub.
Can 1.3967 be welded?
Weld with matching high-N/Nb or over-alloyed Ni-base filler (e.g. 21-16-5-3 or ERNiCrMo-3), low heat input, interpass < 150 °C, Ar+N₂ shielding to limit nitrogen loss; solution anneal + quench after major repair welds where possible.
Can 1.3967 be formed, bent or molded?
Sand or investment cast with tight melt control (pressurised N addition, low S/O) to avoid nitrogen pinholes; generous risering for the low thermal conductivity, and HIP is recommended for pressure-tight sections.
1.3967 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 |
|---|---|---|
| Cextra-low carbon | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.6 |
| Mnraises N solubility | 4 – 6 | 5 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.02 | 0.01 |
| Cr | 20 – 22 | 21 |
| Ni | 15 – 17 | 16 |
| Mo | 2.5 – 3.5 | 3 |
| Nbstabiliser, grain refinement | 0.1 – 0.3 | 0.2 |
| Nprimary strengthening element | 0.3 – 0.5 | 0.4 |
| Fe | balance |
What surface finishes work on 1.3967?
Pickle and passivate (HNO₃/HF) after heat treatment to restore the passive film; takes a good mechanical/electro-polish, and shot peening improves fatigue without affecting the non-magnetic character.
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 1.3967 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX2CrNiMnMoNNb21-16-5-3
How much does 1.3967 cost?
1.3967 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.
1.3967 — frequently asked
What is 1.3967 used for?
1.3967 is typically used for pump casings and impellers, valve bodies and bonnets, high-strength corrosion-resistant pressure castings, non-magnetic machinery castings, HIP'd pressure-tight housings and chemical process fittings and manifolds. In short: strongest cast austenitic here; nitrogen-strengthened, non-magnetic; hardest of family to machine.
What is the yield strength of 1.3967?
1.3967 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 52% of stainless steel grades. Strength varies by condition: see the 3 listed tempers.
Is 1.3967 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 88% of stainless steel grades). Very difficult: heavy work hardening from the 0.4 % N austenite — use rigid setups, sharp positive-rake carbide/ceramic tools, low speed (30–60 m/min), heavy positive feed and copious high-pressure coolant; never dwell or rub.
Can 1.3967 be welded?
Yes — weldability is rated good (65/100). Weld with matching high-N/Nb or over-alloyed Ni-base filler (e.g. 21-16-5-3 or ERNiCrMo-3), low heat input, interpass < 150 °C, Ar+N₂ shielding to limit nitrogen loss; solution anneal + quench after major repair welds where possible.
What surface finishes work on 1.3967?
Pickle and passivate (HNO₃/HF) after heat treatment to restore the passive film; takes a good mechanical/electro-polish, and shot peening improves fatigue without affecting the non-magnetic character.
Can 1.3967 be formed, bent or molded?
Sand or investment cast with tight melt control (pressurised N addition, low S/O) to avoid nitrogen pinholes; generous risering for the low thermal conductivity, and HIP is recommended for pressure-tight sections.
What is the maximum service temperature of 1.3967?
1.3967 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.3967-AT and 1.3967-AC?
AT is the default condition — standard delivery condition for all castings: maximum corrosion resistance, fully austenitic and non-magnetic, good strength/ductility balance. AC: only for rough stock or non-corrosive structural parts — interdendritic carbide/nitride segregation lowers ductility and pitting resistance; not a normal delivery condition. Yield strength is 380 MPa in AT versus 400 MPa in AC.
How much does 1.3967 cost?
1.3967 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
- SEW 400 / DIN EN 10283 — corrosion-resistant steel castings — VDEh / CEN (2010)
- DIN 17440 / DIN EN 10088 designation data for X2CrNiMnMoNNb21-16-5-3 (1.3964) — DIN/CEN (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook — Stainless Steels — ASM International (1994)
- High-nitrogen non-magnetic austenitic steel (P900/1.3964 family) datasheets — Böhler / Energietechnik steel producers (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.