Stainless Steel 1.4317
EN 1.4317 · UNS J91540 · ASTM A743/A487 Gr. CA6NM
1.4317 (GX4CrNi13-4, ASTM A743/A487 Gr.
Reference datasheet — 1.4317 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 QT780 condition
1.4317 tempers and conditions
1.4317 is supplied in 5 conditions, soft to hard. QT780 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 |
|---|---|---|---|---|---|---|
Q&T, double tempered to ≤23 HRC | Specify for wet H2S / sour oilfield valve and pump castings where sulfide stress cracking control caps hardness at 23 HRC. | 585 | 790 | 20 | 22 HRC | 2.9 % IACS |
Stress relieved | Delivery state for weld-repaired or fabricated runner castings: a sub-critical temper (580–610 °C) restores HAZ toughness and relieves welding stress. | 600 | 810 | 18 | 24 HRC | 2.9 % IACS |
QT780Default austenitised ~1000–1050 °C, air/oil quenched, tempered 590–620 °C | The standard commercial delivery condition — best balance of 550 MPa yield, 15 % elongation and high notch toughness for turbine runners, pump and valve castings. | 620 | 830 | 18 | 25 HRC | — |
austenitised, quenched, double tempered ~560–600 °C for higher strength | Choose when a higher yield (≥690 MPa) is specified for heavily loaded runners or high-head hydraulic parts, accepting lower toughness margin. | 730 | 930 | 15 | 31 HRC | — |
As fabricated | Foundry raw state only — hard, brittle and not supplied for service; must be austenitised and tempered before use. | 900 | 1,200 | 6 | 43 HRC | 2.8 % IACS |
What is 1.4317?
1.4317 (GX4CrNi13-4, ASTM A743/A487 Gr. CA6NM, UNS J91540) is the European low-carbon soft martensitic 13Cr-4Ni cast stainless steel, hardened by austenitising and tempering. Hydraulic turbine runners, pump impellers and casings use it for roughly 620 MPa yield, 830 MPa tensile, 18% elongation and 260 HB (25 HRC) combined with the best weldability in the martensitic family (score 70), including a NACE-qualified temper. Service is limited to 450 °C, machinability is low (40) and corrosion resistance is moderate (52); for seawater and high-head duty step up to 1.4405 or 1.4411 (16Cr-5Ni-Mo). 1.4317 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). 1.4317 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
What is 1.4317 used for?
- Hydraulic turbine runners
- Pump impellers and casings
- Compressor casings
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
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Limited formability — 15/100, worse than 91% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
- Needs corrosion protection — 52/100, worse than 76% of stainless steel grades
1.4317 properties
Typical room-temperature values for 1.4317-QT780; bars are the position among stainless steel grades.
Physical3
1.4317 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
1.4317 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
1.4317 is rated for continuous service to 450°C (842 °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
1.4317 conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 76% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4317 takes about 50 MJ of energy and emits 3.6 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4317's machinability is fair (40/100, better than 72% of stainless steel grades); weldability very good (70/100); formability poor (15/100).
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. 1.4317 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4317
Is 1.4317 easy to machine?
Machine in the tempered condition with rigid setups, sharp positive-rake carbide and heavy coolant; gummy chips and work hardening make it roughly 40 % of 1212 speed, so avoid dwelling and use climb-milling where possible.
Can 1.4317 be welded?
Very good for a martensitic grade — use matching 13/4 or 410NiMo consumables (or austenitic 309L/E309 for buttering), preheat 100–160 °C, keep interpass below 300 °C and post-weld temper 580–620 °C to restore HAZ toughness.
Can 1.4317 be formed, bent or molded?
Sand or investment cast only; design generous fillets and directional risering, hot-tear-prone in thick-to-thin transitions, and always austenitise + temper the whole casting rather than cold working.
1.4317 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 C for weldability | ≤ 0.06 | 0.04 |
| Si | ≤ 1 | 0.6 |
| Mn | ≤ 1 | 0.7 |
| PASTM A743 allows 0.04 max | ≤ 0.04 | |
| SASTM A743 allows 0.03 max | ≤ 0.03 | |
| CrASTM CA6NM: 11.5–14.0 | 12 – 13.5 | 12.8 |
| NiASTM CA6NM: 3.5–4.5 | 3.5 – 5 | 4.2 |
| MoASTM CA6NM: 0.4–1.0 | ≤ 0.7 | 0.5 |
| Ntypical foundry limit | ≤ 0.05 | |
| Fe | balance |
What surface finishes work on 1.4317?
Passivate or electropolish after grinding to restore the chromium oxide film; takes a good mechanical polish, and hard-chrome or thermal-spray coatings are common on cavitation-exposed turbine surfaces.
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 1.4317 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- J91540
- ASTM
- A743/A487 Gr. CA6NM
- EN / DIN / Werkstoff-Nr.
- GX4CrNi13-4
How much does 1.4317 cost?
1.4317 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.
1.4317 — frequently asked
What is 1.4317 used for?
1.4317 is typically used for hydraulic turbine runners, pump impellers and casings and compressor casings. In short: most weldable cast martensitic; CA6NM turbine standard; tough low-carbon 13Cr-4Ni.
What is the yield strength of 1.4317?
1.4317 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is 1.4317 easy to machine?
Not especially — machinability is rated fair (40/100, better than 72% of stainless steel grades). Machine in the tempered condition with rigid setups, sharp positive-rake carbide and heavy coolant; gummy chips and work hardening make it roughly 40 % of 1212 speed, so avoid dwelling and use climb-milling where possible.
Can 1.4317 be welded?
Yes — weldability is rated very good (70/100). Very good for a martensitic grade — use matching 13/4 or 410NiMo consumables (or austenitic 309L/E309 for buttering), preheat 100–160 °C, keep interpass below 300 °C and post-weld temper 580–620 °C to restore HAZ toughness.
What surface finishes work on 1.4317?
Passivate or electropolish after grinding to restore the chromium oxide film; takes a good mechanical polish, and hard-chrome or thermal-spray coatings are common on cavitation-exposed turbine surfaces.
Can 1.4317 be formed, bent or molded?
Sand or investment cast only; design generous fillets and directional risering, hot-tear-prone in thick-to-thin transitions, and always austenitise + temper the whole casting rather than cold working.
What is the maximum service temperature of 1.4317?
1.4317 is rated for continuous use to about 450°C (842 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4317-QT780 and 1.4317-F?
QT780 is the default condition — the standard commercial delivery condition — best balance of 550 MPa yield, 15 % elongation and high notch toughness for turbine runners, pump and valve castings. F: foundry raw state only — hard, brittle and not supplied for service; must be austenitised and tempered before use. Yield strength is 620 MPa in QT780 versus 900 MPa in F.
How much does 1.4317 cost?
1.4317 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 (GX4CrNi13-4 / 1.4317) — CEN (2010)
- ASTM A743/A743M — Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant (CA6NM) — ASTM (2021)
- ASTM A487/A487M — Steel Castings Suitable for Pressure Service (CA6NM Class A/B) — ASTM (2020)
- ISO 15156-3 / NACE MR0175 — hardness limits for martensitic stainless steels — ISO/NACE (2020)
- 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)
- GB/T 6967 / GB/T 2100 ZG04Cr13Ni4Mo — SAC (2009)
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.