Stainless Steel 1.4418
EN 1.4418
1.4418 (X4CrNiMo16-5-1, UNS S41500) is a 16Cr-5Ni-1Mo soft martensitic stainless that trades a little toughness for better general and chloride corrosion resistance than 1.4313.
Reference datasheet — 1.4418 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 +QT900 condition
1.4418 tempers and conditions
1.4418 is supplied in 5 conditions, soft to hard. +QT900 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 |
|---|---|---|---|---|---|---|
Annealed | Delivery condition for further machining, forming or subsequent hardening; lowest hardness available for this grade. | 600 | 800 | 20 | 25 HRC | — |
+QT | Double-tempered low-hardness condition specified for H2S-containing (sour) oil & gas and offshore pump components. | 600 | 800 | 21 | 22 HRC | — |
Quenched and tempered, Rm 760–960 MPa | Highest-toughness Q&T level; choose for heavy sections, welded fabrications and low-temperature impact requirements. | 620 | 850 | 20 | 24 HRC | — |
Quenched and tempered, Rm 840–980 MPa | Balanced strength/toughness condition widely used for pump and valve shafts in seawater service. | 700 | 900 | 18 | 28 HRC | — |
+QT900Default Quenched and tempered, Rm 900–1100 MPa | Most commonly stocked bar condition: highest strength level of the grade while keeping useful impact toughness. | 780 | 980 | 17 | 31 HRC | — |
What is 1.4418?
1.4418 (X4CrNiMo16-5-1, UNS S41500) is a 16Cr-5Ni-1Mo soft martensitic stainless that trades a little toughness for better general and chloride corrosion resistance than 1.4313. Supplied as quenched and tempered bar, forgings and plate, it provides 780 MPa yield, 980 MPa tensile, 17 % elongation and 300 HB (31 HRC), and machines and welds well enough for pump and valve components. Service is limited to about 300 °C and cold formability is poor, and corrosion resistance still falls short of duplex; move to 1.4462 for continuous seawater service. 1.4418 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). 1.4418 has a yield strength of 780 MPa (113 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 95% of stainless steel grades. Elongation at break is 17% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4418 used for?
- Seawater pump shafts
- Valve stems
- Hydraulic components
Advantages
- High strength — 780 MPa (113 ksi), better than 95% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Limited ductility — 17%, worse than 86% of stainless steel grades
- Limited formability — 22/100, worse than 82% of stainless steel grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 77% of stainless steel grades
1.4418 properties
Typical room-temperature values for 1.4418-+QT900; bars are the position among stainless steel grades.
Physical3
1.4418 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
1.4418 has a yield strength of 780 MPa (113 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 95% of stainless steel grades. Elongation at break is 17% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4418 is rated for continuous service to 300°C (572 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4418 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 1.4418 takes about 55 MJ of energy and emits 5.5 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 60%.
Manufacturability8
1.4418's machinability is fair (35/100, better than 51% of stainless steel grades); weldability good (68/100); formability poor (22/100).
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. 1.4418 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4418
Is 1.4418 easy to machine?
Machines like a 30 HRC alloy steel: rigid setups, sharp coated carbide, moderate speed with heavy positive feed to cut under the work-hardened skin, ample coolant.
Can 1.4418 be welded?
Readily weldable by GTAW/GMAW/SMAW without preheat in thin sections (preheat 100–150 °C for heavy sections); use matching 16-5-1 or austenitic 309L/316L filler and post-weld temper at ~580–620 °C to restore HAZ toughness.
Can 1.4418 be formed, bent or molded?
Hot forge/roll at 1100–1200 °C and air cool; cold forming is limited by the hard martensitic matrix — bend only in the annealed condition with generous radii.
1.4418 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 soft martensite | ≤ 0.06 | 0.04 |
| Si | ≤ 0.7 | 0.4 |
| Mn | ≤ 1.5 | 0.8 |
| P | ≤ 0.04 | |
| S | ≤ 0.02 | |
| Cr | 15 – 17 | 16 |
| Ni | 4 – 6 | 5 |
| Mo | 0.8 – 1.5 | 1 |
| NEN 10088-3 requires N ≥ 0.020 | 0.02 – 0.07 | 0.04 |
| Fe | balance |
What surface finishes work on 1.4418?
Passivate (ASTM A967 nitric/citric) or electropolish after machining; not anodizable, takes hard chrome, nitriding or PVD for wear surfaces and polishes to a good mirror finish.
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 1.4418 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X4CrNiMo16-5-1
- Similar grades
- S41500
How much does 1.4418 cost?
1.4418 is a premium-cost stainless steel ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4418 — frequently asked
What is 1.4418 used for?
1.4418 is typically used for seawater pump shafts, valve stems and hydraulic components. In short: most corrosion-resistant soft martensitic; higher strength than 1.4313; weldable 31 HRC stainless.
What is the yield strength of 1.4418?
1.4418 has a typical yield strength of 780 MPa (113 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 95% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4418 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Machines like a 30 HRC alloy steel: rigid setups, sharp coated carbide, moderate speed with heavy positive feed to cut under the work-hardened skin, ample coolant.
Can 1.4418 be welded?
Yes — weldability is rated good (68/100). Readily weldable by GTAW/GMAW/SMAW without preheat in thin sections (preheat 100–150 °C for heavy sections); use matching 16-5-1 or austenitic 309L/316L filler and post-weld temper at ~580–620 °C to restore HAZ toughness.
What surface finishes work on 1.4418?
Passivate (ASTM A967 nitric/citric) or electropolish after machining; not anodizable, takes hard chrome, nitriding or PVD for wear surfaces and polishes to a good mirror finish.
Can 1.4418 be formed, bent or molded?
Hot forge/roll at 1100–1200 °C and air cool; cold forming is limited by the hard martensitic matrix — bend only in the annealed condition with generous radii.
What is the maximum service temperature of 1.4418?
1.4418 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1.4418 cost?
1.4418 is a premium-cost stainless steel ($$$), 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 10088-3 Stainless steels – Semi-finished products, bars, rods, sections — CEN (2014)
- EN 10088-1 Stainless steels – List of stainless steels — CEN (2014)
- ASTM A182 / UNS S41500 (comparable soft martensitic grade) — ASTM (2022)
- 1.4418 / X4CrNiMo16-5-1 bar datasheet — Deutsche Edelstahlwerke / Zapp (2020)
- ASM Handbook Vol.1: Properties and Selection – Irons, Steels — ASM International (1990)
- NACE MR0175 / ISO 15156-3 (hardness limits for martensitic stainless steels) — NACE/ISO (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.