Stainless Steel 1.3955
EN 1.3955
1.3955 (GX12CrNi18-11, ASTM A743 CF8, UNS J92600) is a standard-carbon 18Cr-11Ni austenitic stainless casting grade, the European counterpart to cast 304, used for general-purpose corrosion-resistant castings.
Reference datasheet — 1.3955 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 ST condition
1.3955 tempers and conditions
1.3955 is supplied in 5 conditions, soft to hard. ST 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 |
|---|---|---|---|---|---|---|
Spheroidize annealed | Cheapest condition for non-corrosive structural or ornamental castings only; retained carbides make it sensitization-prone. | 250 | 500 | 30 | 155 HB | 2.3 % IACS |
STDefault Solution annealed | Standard supply condition for all corrosion-service castings; dissolves carbides and restores maximum corrosion resistance and ductility. | 255 | 520 | 50 | 140 HB | — |
Solution annealed after hot isostatic pressing | Choose for pressure-tight, radiographically clean castings (valve/pump bodies, nuclear and subsea parts) where micro-shrinkage must be closed. | 265 | 545 | 55 | 145 HB | 2.3 % IACS |
Centrifugally cast + solution annealed (ASTM A451 CPF8 type) | Pipe and cylinder forms with denser, finer structure and higher strength than static castings. | 275 | 545 | 45 | 150 HB | 2.3 % IACS |
CF8A-type | Same chemistry but ferrite balanced to a higher level for greater strength where a stronger casting is specified. | 285 | 570 | 45 | 155 HB | 2.4 % IACS |
What is 1.3955?
1.3955 (GX12CrNi18-11, ASTM A743 CF8, UNS J92600) is a standard-carbon 18Cr-11Ni austenitic stainless casting grade, the European counterpart to cast 304, used for general-purpose corrosion-resistant castings. It is produced by sand, investment and centrifugal casting and delivers 255 MPa yield, 520 MPa tensile, 50 % elongation, 140 HB (77 HRB) and service to 760 °C. The higher carbon makes it sensitive to weld-zone sensitization, so for as-welded corrosion duty use the low-carbon 1.3940 (CF3) instead. 1.3955 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.3955 has a yield strength of 255 MPa (37 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 87% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 193 GPa (28 Msi).
What is 1.3955 used for?
- valve bodies
- pump casings
- process piping fittings
Advantages
- Ductile — tolerates forming and impact — 50%, better than 90% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
Limitations
- Low strength — 255 MPa (37 ksi), worse than 87% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
1.3955 properties
Typical room-temperature values for 1.3955-ST; bars are the position among stainless steel grades.
Physical3
1.3955 has a density of 7.75 g/cm³ (0.28 lb/in³), lighter than 65% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.3955 has a yield strength of 255 MPa (37 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 87% of stainless steel grades. Elongation at break is 50% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
1.3955 is rated for continuous service to 760°C (1,400 °F). It conducts heat at 16.2 W/m·K (9.36 BTU/hr·ft·°F), better than 64% of stainless steel grades. Thermal expansion is 17.3 µm/m·K (9.61 µin/in·°F).
Electrical3
1.3955 conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.3955 takes about 58 MJ of energy and emits 4.2 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.3955's machinability is fair (40/100, better than 72% of stainless steel grades); weldability very good (75/100); formability poor (25/100).
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. 1.3955 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.3955
Is 1.3955 easy to machine?
Gummy and work-hardening: use sharp positive-rake carbide, heavy positive feed to cut under the hardened skin, ~60–110 m/min, flood coolant; avoid dwelling.
Can 1.3955 be welded?
Readily welded with ER308/E308 (or 308L for as-welded corrosion service) by GTAW/SMAW; no preheat, keep interpass below ~150 °C and post-weld solution anneal for critical corrosion duty.
Can 1.3955 be formed, bent or molded?
Sand, investment and centrifugal casting all suitable; good fluidity with ~2.0–2.5 % solidification shrinkage — feed heavy sections generously and control ferrite (FN 5–15) to avoid hot tearing.
1.3955 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 |
|---|---|---|
| CASTM A743 CF8 limit; EN GX12CrNi18-11 allows up to ~0.15 C | ≤ 0.08 | 0.06 |
| Mn | ≤ 1.5 | 0.8 |
| Sihigh Si aids fluidity | ≤ 2 | 1.2 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.04 | 0.02 |
| Cr | 18 – 21 | 19.5 |
| Ni | 8 – 11 | 9.5 |
| Moresidual only | ≤ 0.5 | 0.2 |
| Fe | balance |
What surface finishes work on 1.3955?
Pickle and passivate (ASTM A967) or shot blast + electropolish; cannot be anodized, and casting skin porosity limits mirror polishing.
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 1.3955 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX12CrNi18-11
- Similar grades
- A743 CF8J92600
How much does 1.3955 cost?
1.3955 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.
1.3955 — frequently asked
What is 1.3955 used for?
1.3955 is typically used for valve bodies, pump casings and process piping fittings. In short: general-purpose cast 304; service to 760 °C; widely available casting grade.
What is the yield strength of 1.3955?
1.3955 has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 87% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.3955 easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Gummy and work-hardening: use sharp positive-rake carbide, heavy positive feed to cut under the hardened skin, ~60–110 m/min, flood coolant; avoid dwelling.
Can 1.3955 be welded?
Yes — weldability is rated very good (75/100). Readily welded with ER308/E308 (or 308L for as-welded corrosion service) by GTAW/SMAW; no preheat, keep interpass below ~150 °C and post-weld solution anneal for critical corrosion duty.
What surface finishes work on 1.3955?
Pickle and passivate (ASTM A967) or shot blast + electropolish; cannot be anodized, and casting skin porosity limits mirror polishing.
Can 1.3955 be formed, bent or molded?
Sand, investment and centrifugal casting all suitable; good fluidity with ~2.0–2.5 % solidification shrinkage — feed heavy sections generously and control ferrite (FN 5–15) to avoid hot tearing.
What is the maximum service temperature of 1.3955?
1.3955 is rated for continuous use to about 760°C (1,400 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.3955-ST and 1.3955-CF8A?
ST is the default condition — standard supply condition for all corrosion-service castings; dissolves carbides and restores maximum corrosion resistance and ductility. CF8A: same chemistry but ferrite balanced to a higher level for greater strength where a stronger casting is specified. Yield strength is 255 MPa in ST versus 285 MPa in CF8A.
How much does 1.3955 cost?
1.3955 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
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application (grade CF8) — ASTM International (2019)
- ASTM A351/A351M — Castings, Austenitic, for Pressure-Containing Parts (CF8, CF8A) — ASTM International (2018)
- EN 10213 — Steel castings for pressure purposes — CEN (2016)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- Steel Castings Handbook, 6th ed. — Steel Founders' Society of America / ASM (1995)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.