Stainless Steel 1.4422
EN 1.4422
1.4422 (X1CrNiMoCu12-5-2) is a soft martensitic stainless steel with 12Cr-5Ni-2Mo plus copper and ultra-low carbon (≤0.03 %), used in the EN 10088 martensitic family.
Reference datasheet — 1.4422 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
1.4422 tempers and conditions
1.4422 is supplied in 7 conditions, soft to hard. +QT900 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for heavy machining or cold work before final quench-and-temper. | 600 | 800 | 20 | 24 HRC | 2.3 % IACS |
Quenched and tempered, Rm 760–960 MPa | Lower-strength, highest-toughness QT class for thick sections, welded pump casings and sour-service parts. | 640 | 850 | 19 | 26 HRC | — |
Quenched and tempered, Rm 800–1000 MPa | Intermediate strength class often specified for shafts and flanges in medium-thickness sections. | 700 | 900 | 18 | 29 HRC | 2.3 % IACS |
As-welded deposit | Reference condition for matching-consumable welds before post-weld tempering; a 600–650 °C PWHT restores toughness. | 700 | 900 | 15 | 33 HRC | 2.3 % IACS |
+QT900Default Quenched and tempered, Rm 900–1100 MPa | Standard stocked condition: best strength/toughness balance for pump and compressor shafts, impellers and marine hardware. | 780 | 980 | 17 | 31 HRC | — |
+C | Pick for precision shafting where h9/h11 tolerance and a ground surface are needed straight from stock. | 820 | 1,000 | 15 | 32 HRC | 2.3 % IACS |
Quenched and low-temperature tempered, Rm ≥1000 MPa | Highest strength class for small-diameter shafts and fasteners where toughness and sour-service margin can be traded away. | 880 | 1,070 | 15 | 35 HRC | 2.3 % IACS |
What is 1.4422?
1.4422 (X1CrNiMoCu12-5-2) is a soft martensitic stainless steel with 12Cr-5Ni-2Mo plus copper and ultra-low carbon (≤0.03 %), used in the EN 10088 martensitic family. It combines high strength with genuine weldability, so it is specified for pump shafts, impellers and marine hardware in bar, forging and plate form. Default quenched-and-tempered values are 780 MPa yield, 980 MPa tensile, 17 % elongation and about 300 HB (31 HRC), with service limited to roughly 300 °C. Corrosion resistance (55/100) is better than 420-type martensitics but below duplex; step up to 1.4423 for more aggressive media. 1.4422 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). 1.4422 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 1.4422 used for?
- Pump components
- Food processing equipment
- Marine hardware
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
1.4422 properties
Typical room-temperature values for 1.4422-+QT900; bars are the position among stainless steel grades.
Physical3
1.4422 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
1.4422 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
1.4422 is rated for continuous service to 300°C (572 °F). It conducts heat at 15.5 W/m·K (8.96 BTU/hr·ft·°F), better than 53% of stainless steel grades. Thermal expansion is 10.8 µm/m·K (6 µin/in·°F).
Electrical3
1.4422 conducts electricity at 2.3 % IACS, better than 55% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 71% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4422 takes about 55 MJ of energy and emits 5.4 kg of CO₂ — more than 50% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
1.4422's machinability is fair (38/100, better than 63% of stainless steel grades); weldability very good (75/100); 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. 1.4422 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4422
Is 1.4422 easy to machine?
Machines like a 30 HRC tough stainless: rigid setups, sharp coated carbide, positive rake, 60–110 m/min, generous feed and coolant to avoid work hardening and built-up edge.
Can 1.4422 be welded?
Very good for a martensitic grade thanks to ≤0.03 %C — GTAW/GMAW/SAW with matching 12-5-2 or over-alloyed duplex/super-duplex filler, preheat 100–150 °C for thick sections and PWHT at 600–650 °C to temper the HAZ.
Can 1.4422 be formed, bent or molded?
Hot forge/roll at 1100–1150 °C with slow cooling; cold forming is limited in QT condition, so bend and form in the annealed state and re-quench-and-temper.
1.4422 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 |
|---|---|---|
| Cultra-low carbon (X1 designation) | ≤ 0.03 | 0.02 |
| Si | ≤ 0.7 | 0.35 |
| Mn | ≤ 2 | 0.8 |
| P | ≤ 0.03 | 0.02 |
| Slow S for weldability and toughness | ≤ 0.01 | 0 |
| Cr | 11 – 13 | 12 |
| Ni | 4.5 – 6 | 5.2 |
| Mo | 1.5 – 2.5 | 2 |
| Cu | 0.3 – 1 | 0.6 |
| N | ≤ 0.03 | 0.02 |
| Fe | balance |
What surface finishes work on 1.4422?
Passivate in nitric or citric acid after machining and pickle/blast weld scale; polishes to a bright finish, and hard chrome, nitriding or PVD can be applied where wear resistance is needed.
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 1.4422 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X1CrNiMoCu12-5-2
How much does 1.4422 cost?
1.4422 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.
1.4422 — frequently asked
What is 1.4422 used for?
1.4422 is typically used for pump components, food processing equipment and marine hardware. In short: weldable martensitic stainless; soft martensitic pump grade; 780 MPa yield, 31 HRC.
What is the yield strength of 1.4422?
1.4422 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 7 listed tempers.
Is 1.4422 easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% of stainless steel grades). Machines like a 30 HRC tough stainless: rigid setups, sharp coated carbide, positive rake, 60–110 m/min, generous feed and coolant to avoid work hardening and built-up edge.
Can 1.4422 be welded?
Yes — weldability is rated very good (75/100). Very good for a martensitic grade thanks to ≤0.03 %C — GTAW/GMAW/SAW with matching 12-5-2 or over-alloyed duplex/super-duplex filler, preheat 100–150 °C for thick sections and PWHT at 600–650 °C to temper the HAZ.
What surface finishes work on 1.4422?
Passivate in nitric or citric acid after machining and pickle/blast weld scale; polishes to a bright finish, and hard chrome, nitriding or PVD can be applied where wear resistance is needed.
Can 1.4422 be formed, bent or molded?
Hot forge/roll at 1100–1150 °C with slow cooling; cold forming is limited in QT condition, so bend and form in the annealed state and re-quench-and-temper.
What is the maximum service temperature of 1.4422?
1.4422 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.
What is the difference between 1.4422 +QT900 and 1.4422-AW?
+QT900 is the default condition — standard stocked condition: best strength/toughness balance for pump and compressor shafts, impellers and marine hardware. AW: reference condition for matching-consumable welds before post-weld tempering; a 600–650 °C PWHT restores toughness. Yield strength is 780 MPa in +QT900 versus 700 MPa in AW.
How much does 1.4422 cost?
1.4422 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)
- Soft-martensitic / supermartensitic 12Cr-5Ni-2Mo stainless bar datasheet — Deutsche Edelstahlwerke (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- 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.