Stainless Steel 1.4568
EN 1.4568 · UNS S17700 · AISI/SAE 17-7PH · GB 07Cr17Ni7Al
1.4568 is the European grade for 17-7 PH (X7CrNiAl17-7, S17700), a semi-austenitic Cr-Ni-Al precipitation-hardening stainless that is soft and formable as annealed — 275 MPa yield, 895 MPa tensile, 35 % elongation and 165 HB in +AT — then austenite-conditioned and aged to TH1050, R-100, +P1450 or CH900 strength levels.
Reference datasheet — 1.4568 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
1.4568 tempers and conditions
1.4568 is supplied in 6 conditions, soft to hard. +AT 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 |
|---|---|---|---|---|---|---|
+ATDefault Solution annealed | Buy in this condition when the part must be deep-drawn, roll-formed or welded first and hardened afterwards. | 275 | 895 | 35 | 165 HB | 16 W/m·K |
Condition R-100 | Intermediate martensitic state supplied when the customer will do the final 510 °C age (RH950) themselves. | 760 | 1,030 | 6 | 33 HRC | 2.1 % IACS |
Austenite conditioned 760 °C, cooled to 15 °C, aged 565 °C/90 min | The general-purpose hardened condition: best strength/toughness balance for brackets, clips and machined parts. | 1,210 | 1,310 | 9 | 42 HRC | 16 W/m·K |
Cold drawn | Cold-rolled strip stock intended to be aged to CH900 after simple forming or coiling. | 1,310 | 1,450 | 2 | 42 HRC | — |
austenite conditioned 955 °C, refrigerated −73 °C, aged 510 °C, Rm ≥ 1450 MPa | Choose when maximum strength and elastic limit are needed from sheet, strip or bar and some ductility must remain. | 1,380 | 1,520 | 6 | 46 HRC | 16 W/m·K |
Cold rolled (Condition C) then aged 480 °C/1 h | Highest-strength strip condition for flat springs, diaphragms and shim stock where forming is minimal. | 1,655 | 1,790 | 2 | 48 HRC | — |
What is 1.4568?
1.4568 is the European grade for 17-7 PH (X7CrNiAl17-7, S17700), a semi-austenitic Cr-Ni-Al precipitation-hardening stainless that is soft and formable as annealed — 275 MPa yield, 895 MPa tensile, 35 % elongation and 165 HB in +AT — then austenite-conditioned and aged to TH1050, R-100, +P1450 or CH900 strength levels. Engineers choose it when a part must be coiled, drawn or stamped first and reach spring temper afterwards; strip, coil, wire and sheet are the usual forms. Corrosion resistance (64/100) sits below 304, maximum service temperature is 340 °C, and welded joints need re-solution treatment plus the full aging cycle. Where no forming is required, martensitic 17-4 PH (1.4542) machines and heat treats more simply. 1.4568 has a density of 7.81 g/cm³ (0.282 lb/in³), heavier than 57% of stainless steel grades. It melts at 1,400°C (2,552 °F). 1.4568 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 895 MPa (130 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4568 used for?
- springs
- diaphragms
- aerospace structural parts
- fasteners
Advantages
- Forms and bends easily — 75/100, better than 87% of stainless steel grades
Limitations
- Limited service temperature — 340°C (644 °F), worse than 85% of stainless steel grades
- Low strength — 275 MPa (39.9 ksi), worse than 77% of stainless steel grades
1.4568 properties
Typical room-temperature values for 1.4568-+AT; bars are the position among stainless steel grades.
Physical3
1.4568 has a density of 7.81 g/cm³ (0.282 lb/in³), heavier than 57% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
1.4568 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 895 MPa (130 ksi) — weaker than 77% of stainless steel grades. Elongation at break is 35% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4568 is rated for continuous service to 340°C (644 °F). It conducts heat at 16.4 W/m·K (9.48 BTU/hr·ft·°F), better than 69% of stainless steel grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
1.4568 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 54% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4568 takes about 53 MJ of energy and emits 5 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
1.4568's machinability is fair (40/100, better than 72% of stainless steel grades); weldability good (65/100); formability very good (75/100).
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. 1.4568 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4568
Is 1.4568 easy to machine?
Machine in Condition A with sharp, rigid tooling, positive rake and heavy coolant (work-hardens fast); finish machining after TH1050/RH950 needs carbide or CBN and light DOC, and allow ~0.1 % dimensional change during aging.
Can 1.4568 be welded?
GTAW, plasma and resistance welding are straightforward in Condition A with matching or 17-7 PH filler; re-solution anneal plus the full aging cycle is required to restore joint strength — avoid welding in the hardened condition.
Can 1.4568 be formed, bent or molded?
Form, draw and coil only in Condition A (or Condition C for simple bends); springback is high, and hardened TH1050/RH950/CH900 material should be considered essentially non-formable.
1.4568 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 |
|---|---|---|
| CEN X7CrNiAl17-7 | ≤ 0.09 | 0.07 |
| Si | ≤ 0.7 | 0.4 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.04 | |
| SASTM A693 allows 0.030 max | ≤ 0.02 | |
| Cr | 16 – 18 | 17 |
| Ni | 6.5 – 7.8 | 7.1 |
| Alprecipitation-hardening element (NiAl) | 0.75 – 1.5 | 1.15 |
| N | ≤ 0.04 | |
| Fe | balance |
What surface finishes work on 1.4568?
Passivate per ASTM A967 or electropolish after descaling; no anodizing — hard chrome, electroless nickel and PVD are used for wear surfaces, with bake-out to avoid hydrogen embrittlement at ≥1450 MPa strength levels.
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 1.4568 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- S17700
- AISI / SAE
- 17-7PH
- EN / DIN / Werkstoff-Nr.
- X7CrNiAl17-7
- GB (China)
- 07Cr17Ni7Al
- Also called
- 0Cr17Ni7Al
- Other
- 17-7 PH
How much does 1.4568 cost?
1.4568 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.
1.4568 — frequently asked
What is 1.4568 used for?
1.4568 is typically used for springs, diaphragms, aerospace structural parts and fasteners. In short: formable then spring-hard; european 17-7 PH equivalent; wide temper range.
What is the yield strength of 1.4568?
1.4568 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 895 MPa (130 ksi) — weaker than 77% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1.4568 easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machine in Condition A with sharp, rigid tooling, positive rake and heavy coolant (work-hardens fast); finish machining after TH1050/RH950 needs carbide or CBN and light DOC, and allow ~0.1 % dimensional change during aging.
Can 1.4568 be welded?
Yes — weldability is rated good (65/100). GTAW, plasma and resistance welding are straightforward in Condition A with matching or 17-7 PH filler; re-solution anneal plus the full aging cycle is required to restore joint strength — avoid welding in the hardened condition.
What surface finishes work on 1.4568?
Passivate per ASTM A967 or electropolish after descaling; no anodizing — hard chrome, electroless nickel and PVD are used for wear surfaces, with bake-out to avoid hydrogen embrittlement at ≥1450 MPa strength levels.
Can 1.4568 be formed, bent or molded?
Form, draw and coil only in Condition A (or Condition C for simple bends); springback is high, and hardened TH1050/RH950/CH900 material should be considered essentially non-formable.
What is the maximum service temperature of 1.4568?
1.4568 is rated for continuous use to about 340°C (644 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4568 +AT and 1.4568-CH900?
+AT is the default condition — buy in this condition when the part must be deep-drawn, roll-formed or welded first and hardened afterwards. CH900: highest-strength strip condition for flat springs, diaphragms and shim stock where forming is minimal. Yield strength is 275 MPa in +AT versus 1,655 MPa in CH900.
How much does 1.4568 cost?
1.4568 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 10088-2/-3 Stainless steels — technical delivery conditions (1.4568) — CEN (2014)
- ASTM A693 — Precipitation-Hardening Stainless Steel Plate, Sheet and Strip (UNS S17700) — ASTM (2022)
- AMS 5528 / AMS 5529 — 17-7 PH sheet, strip and plate — SAE International (2018)
- 17-7 PH Stainless Steel product data bulletin — AK Steel / Cleveland-Cliffs (2016)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- GB/T 1220 / GB/T 3280 — 07Cr17Ni7Al — SAC (2007)
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.