Stainless Steel 1.4405
EN 1.4405
1.4405 (GX4CrNiMo16-5-1) is a high-alloy soft martensitic cast stainless steel with 16% Cr, 5% Ni and molybdenum, giving corrosion resistance and toughness beyond CA6NM-type grades.
Reference datasheet — 1.4405 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 QT760 condition
1.4405 tempers and conditions
1.4405 is supplied in 6 conditions, soft to hard. QT760 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Choose when the casting must be rough-machined or heavily welded before final quench-and-temper. | 480 | 720 | 20 | 21 HRC | 2.2 % IACS |
+QT760 double tempered | Pick for sub-zero / offshore duty or thick sections where retained-austenite conditioning and full temper of fresh martensite are required. | 600 | 820 | 20 | 27 HRC | 2.2 % IACS |
QT760Default austenitized ~1000–1050 °C, quenched, tempered ~580–620 °C | Standard EN 10283 delivery condition; the balanced strength/toughness state for pumps, valves and hydraulic turbine parts. | 620 | 850 | 18 | 29 HRC | — |
HIP + quenched and tempered | Specify for thick-wall pressure-containing or fatigue-critical castings where internal porosity must be closed. | 640 | 880 | 20 | 29 HRC | 2.2 % IACS |
Spheroidize annealed | Raw casting with untempered martensite; only an intermediate state for shipping to heat treatment, never for service. | 750 | 1,000 | 6 | 40 HRC | 2.1 % IACS |
lower tempering temperature (~520–560 °C) for higher strength | Order when higher yield/wear capability is needed and impact requirements are moderate (runner hubs, high-head hydraulic parts). | 800 | 980 | 12 | 34 HRC | 2.2 % IACS |
What is 1.4405?
1.4405 (GX4CrNiMo16-5-1) is a high-alloy soft martensitic cast stainless steel with 16% Cr, 5% Ni and molybdenum, giving corrosion resistance and toughness beyond CA6NM-type grades. Sand and investment castings, optionally HIP treated, are quenched-and-tempered for high-head hydraulic and marine service, reaching about 620 MPa yield, 850 MPa tensile, 18% elongation and 285 HB (29 HRC). Machinability is the weak point of the family (score 35) and service is capped at 400 °C; where higher pitting resistance in seawater is required, the higher-Mo 1.4411 (GX4CrNiMo16-5-2) is the direct step up. 1.4405 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.4405 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4405 used for?
- High-head hydraulic turbine components
- Marine and offshore castings
- Pump casings in aggressive media
Advantages
- Conducts heat well — 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Limited formability — 10/100, worse than 95% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Hard to polish — 60/100, worse than 80% of stainless steel grades
- Limited service temperature — 400°C (752 °F), worse than 78% of stainless steel grades
1.4405 properties
Typical room-temperature values for 1.4405-QT760; bars are the position among stainless steel grades.
Physical3
1.4405 has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical16
1.4405 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4405 is rated for continuous service to 400°C (752 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), better than 93% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4405 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 1.4405 takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4405's machinability is fair (35/100, better than 51% of stainless steel grades); weldability good (60/100); formability not recommended (10/100).
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. 1.4405 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4405
Is 1.4405 easy to machine?
Machine in the tempered condition with rigid setups, sharp coated carbide, low speed / high feed and generous coolant; work-hardening skin and cast surface scale demand a heavy first cut.
Can 1.4405 be welded?
Readily weldable with matching 16-5-1 or 410NiMo filler; preheat 100–150 °C, keep interpass below ~180 °C and re-temper at 580–600 °C after major repairs.
Can 1.4405 be formed, bent or molded?
Sand or investment cast with generous feeding and chills; solidification shrinkage ~4–5 %, so risering and directional solidification control soundness.
1.4405 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 soft martensite and weldability | ≤ 0.06 | 0.04 |
| Si | ≤ 0.8 | 0.5 |
| Mn | ≤ 1 | 0.7 |
| P | ≤ 0.04 | 0.02 |
| S | ≤ 0.03 | 0.01 |
| Cr | 15 – 17 | 16 |
| Ni | 4 – 6 | 5 |
| Mopitting/cavitation resistance | 0.7 – 1.5 | 1 |
| Fe | balance |
What surface finishes work on 1.4405?
Passivate or pickle after machining/welding to restore the chromium oxide film; electropolishing improves cleanability, no anodizing — paint or thermal spray only where erosion is severe.
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 1.4405 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX4CrNiMo16-5-1
How much does 1.4405 cost?
1.4405 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.
1.4405 — frequently asked
What is 1.4405 used for?
1.4405 is typically used for high-head hydraulic turbine components, marine and offshore castings and pump casings in aggressive media. In short: corrosion-upgraded soft martensitic; hardest in family, 285 HB; marine and hydraulic castings.
What is the yield strength of 1.4405?
1.4405 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1.4405 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Machine in the tempered condition with rigid setups, sharp coated carbide, low speed / high feed and generous coolant; work-hardening skin and cast surface scale demand a heavy first cut.
Can 1.4405 be welded?
Yes — weldability is rated good (60/100). Readily weldable with matching 16-5-1 or 410NiMo filler; preheat 100–150 °C, keep interpass below ~180 °C and re-temper at 580–600 °C after major repairs.
What surface finishes work on 1.4405?
Passivate or pickle after machining/welding to restore the chromium oxide film; electropolishing improves cleanability, no anodizing — paint or thermal spray only where erosion is severe.
Can 1.4405 be formed, bent or molded?
Sand or investment cast with generous feeding and chills; solidification shrinkage ~4–5 %, so risering and directional solidification control soundness.
What is the maximum service temperature of 1.4405?
1.4405 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4405-QT760 and 1.4405-QT900?
QT760 is the default condition — standard EN 10283 delivery condition; the balanced strength/toughness state for pumps, valves and hydraulic turbine parts. QT900: order when higher yield/wear capability is needed and impact requirements are moderate (runner hubs, high-head hydraulic parts). Yield strength is 620 MPa in QT760 versus 800 MPa in QT900.
How much does 1.4405 cost?
1.4405 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)
- ASTM A743/A487 (CA6NM-type soft martensitic cast stainless) — ASTM (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Steel Castings Handbook — Steel Founders' Society of America / ASM (1995)
- Soft martensitic cast stainless (GX4CrNi13-4 / GX4CrNiMo16-5-1) foundry datasheets — European stainless foundries (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.