Stainless Steel 1.3975
EN 1.3975
1.3975 (GX3CrNiMnSi17-9-8) is a manganese- and silicon-alloyed cast austenitic stainless steel that replaces part of the nickel with manganese, giving an economical nickel-saving grade with reasonable corrosion resistance and castability.
Reference datasheet — 1.3975 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
1.3975 tempers and conditions
1.3975 is supplied in 4 conditions, soft to hard. AT is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ATDefault Solution annealed | Standard delivery condition for pressure and corrosion-service castings: maximum ductility, carbides dissolved, minimum magnetic permeability. | 260 | 540 | 35 | 170 HB | 2.2 % IACS |
Stress relieved | Used only to relieve machining/welding residual stress on dimensionally critical parts; kept below sensitisation range. | 265 | 535 | 33 | 172 HB | 2.2 % IACS |
Solution annealed and hot isostatically pressed | For investment castings needing closed internal porosity: best fatigue life, impact toughness and leak tightness at a cost premium. | 270 | 560 | 42 | 170 HB | 2.2 % IACS |
As fabricated | Cheapest condition for non-corrosive, non-pressure structural castings where dendritic segregation and residual stresses are acceptable. | 280 | 500 | 22 | 185 HB | 2.2 % IACS |
What is 1.3975?
1.3975 (GX3CrNiMnSi17-9-8) is a manganese- and silicon-alloyed cast austenitic stainless steel that replaces part of the nickel with manganese, giving an economical nickel-saving grade with reasonable corrosion resistance and castability. Solution-annealed properties are 260 MPa yield, 540 MPa tensile, 35 % elongation and 170 HB, with service to 700 °C; it is supplied as sand or investment castings, optionally HIP'd or stress relieved. Corrosion resistance (score 55) sits below CF8, the silicon raises hot-cracking risk in welds, and the metal is gummy to cut. 1.4308 (CF8) is the nearest alternative when nickel content is not the constraint. 1.3975 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.3975 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 195 GPa (28.3 Msi).
What is 1.3975 used for?
- General corrosion-resistant castings
- Pump housings
- Valve bodies for water and mild chemical service
- Machinery and structural castings
- Fittings and flanged bodies
- Elevated-temperature brackets and supports
Limitations
- Low strength — 260 MPa (37.7 ksi), worse than 84% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
1.3975 properties
Typical room-temperature values for 1.3975-AT; bars are the position among stainless steel grades.
Physical3
1.3975 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.3975 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 84% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
1.3975 is rated for continuous service to 700°C (1,292 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), worse than 72% of stainless steel grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
1.3975 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.3975 takes about 53 MJ of energy and emits 4.8 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability7
1.3975's machinability is poor (33/100, worse than 57% of stainless steel grades); weldability good (60/100); 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. 1.3975 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.3975
Is 1.3975 easy to machine?
Gummy and strongly work-hardening: use rigid setups, sharp positive-rake carbide, heavy positive feed, 60–110 m/min and flood coolant; never dwell or rub.
Can 1.3975 be welded?
Weldable with 308L/309L or high-Mn austenitic filler using TIG/MMA, low heat input, no preheat, interpass <150 °C; hot-crack risk rises with Si, so keep dilution and restraint low.
Can 1.3975 be formed, bent or molded?
Supplied as sand or investment castings — design 2–3 % shrinkage, generous fillets and directional feeding; solution anneal + water quench after casting for full corrosion performance.
1.3975 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 (X3) to limit carbide sensitisation | ≤ 0.05 | 0.03 |
| Siraises fluidity and scaling resistance | 1 – 2.5 | 1.8 |
| Mnaustenite stabiliser replacing part of the Ni | 7 – 9 | 8 |
| Cr | 16 – 18 | 17 |
| Ni | 8 – 10 | 9 |
| Noptional, strengthens and stabilises austenite | ≤ 0.2 | 0.1 |
| P | ≤ 0.05 | |
| S | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 1.3975?
Pickle and passivate (HNO3-based) after grinding or welding to restore the chromium oxide film; polishes to a fair satin/bright finish, electropolishing helps on porosity-free HIP parts.
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 1.3975 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX3CrNiMnSi17-9-8
How much does 1.3975 cost?
1.3975 is a premium-cost stainless steel ($$$), cheaper than about 51% 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.
1.3975 — frequently asked
What is 1.3975 used for?
1.3975 is typically used for general corrosion-resistant castings, pump housings, valve bodies for water and mild chemical service, machinery and structural castings, fittings and flanged bodies and elevated-temperature brackets and supports. In short: nickel-saving cast austenitic; lower-cost CF8 substitute; moderate corrosion resistance.
What is the yield strength of 1.3975?
1.3975 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 84% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.3975 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 57% of stainless steel grades). Gummy and strongly work-hardening: use rigid setups, sharp positive-rake carbide, heavy positive feed, 60–110 m/min and flood coolant; never dwell or rub.
Can 1.3975 be welded?
Yes — weldability is rated good (60/100). Weldable with 308L/309L or high-Mn austenitic filler using TIG/MMA, low heat input, no preheat, interpass <150 °C; hot-crack risk rises with Si, so keep dilution and restraint low.
What surface finishes work on 1.3975?
Pickle and passivate (HNO3-based) after grinding or welding to restore the chromium oxide film; polishes to a fair satin/bright finish, electropolishing helps on porosity-free HIP parts.
Can 1.3975 be formed, bent or molded?
Supplied as sand or investment castings — design 2–3 % shrinkage, generous fillets and directional feeding; solution anneal + water quench after casting for full corrosion performance.
What is the maximum service temperature of 1.3975?
1.3975 is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.3975-AT and 1.3975-F?
AT is the default condition — standard delivery condition for pressure and corrosion-service castings: maximum ductility, carbides dissolved, minimum magnetic permeability. F: cheapest condition for non-corrosive, non-pressure structural castings where dendritic segregation and residual stresses are acceptable. Yield strength is 260 MPa in AT versus 280 MPa in F.
How much does 1.3975 cost?
1.3975 is a premium-cost stainless steel ($$$), cheaper than about 51% 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
- EN 10283 — Corrosion resistant steel castings — CEN (2010)
- DIN EN 10027-2 Werkstoffnummern (1.39xx non-magnetic / Mn-alloyed austenitic group) — DIN (2015)
- ASM Handbook Vol.1 — Cast Stainless Steels — ASM International (1990)
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.