Stainless Steel 1.4729
EN 1.4729
1.4729 (GX40CrSi13) is a 13% Cr high-silicon cast heat-resisting stainless steel supplied as-cast, annealed, stress relieved or quenched and tempered.
Reference datasheet — 1.4729 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 A condition
1.4729 tempers and conditions
1.4729 is supplied in 4 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ADefault Solution annealed | Standard delivery condition per EN 10295: lowest hardness (≤300 HB) for machining before service at high temperature. | 420 | 680 | 10 | 21 HRC | — |
Stress relieved | Use after welding or heavy machining of complex castings to limit distortion and residual stress without full softening. | 440 | 700 | 8 | 23 HRC | 2.5 % IACS |
Spheroidize annealed | Cheapest condition for non-critical furnace and exhaust hardware where hardness and low ductility are acceptable. | 460 | 720 | 5 | 27 HRC | 2.5 % IACS |
Quenched and tempered | Choose when wear resistance and strength are needed at moderate temperature, e.g. valve seats and guides; toughness stays low. | 750 | 1,000 | 4 | 38 HRC | — |
What is 1.4729?
1.4729 (GX40CrSi13) is a 13% Cr high-silicon cast heat-resisting stainless steel supplied as-cast, annealed, stress relieved or quenched and tempered. In the default condition it provides 420 MPa yield, 680 MPa tensile, 10% elongation and about 230 HB (21 HRC) with service to 850 °C, which suits exhaust valve seats, turbocharger parts and furnace hardware. Ductility is limited, machinability is low (35), and the 0.4% carbon level makes the grade air-hardening and demanding to weld. For scaling resistance above 850 °C, step up to 1.4740 (17Cr-Si). 1.4729 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). 1.4729 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 215 GPa (31.2 Msi).
What is 1.4729 used for?
- exhaust valve seats
- turbocharger parts
- heat-resistant fittings
- furnace components
Advantages
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% of stainless steel grades
- Conducts heat well — 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades
- High service temperature — 850°C (1,562 °F), better than 80% of stainless steel grades
Limitations
- Limited ductility — 10%, worse than 98% of stainless steel grades
- Low fracture toughness — 35 MPa·√m (31.9 ksi·√in), worse than 98% of stainless steel grades
- Limited formability — 8/100, worse than 97% of stainless steel grades
- Difficult to weld — 25/100, worse than 92% of stainless steel grades
- Hard to polish — 55/100, worse than 89% of stainless steel grades
1.4729 properties
Typical room-temperature values for 1.4729-A; bars are the position among stainless steel grades.
Physical3
1.4729 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
1.4729 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 64% of stainless steel grades. Elongation at break is 10% and the elastic modulus is 215 GPa (31.2 Msi).
Thermal6
1.4729 is rated for continuous service to 850°C (1,562 °F). It conducts heat at 24 W/m·K (13.9 BTU/hr·ft·°F), better than 81% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4729 conducts electricity at 2.5 % IACS, better than 75% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4729 takes about 45 MJ of energy and emits 3.4 kg of CO₂ — less than 91% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
1.4729's machinability is fair (35/100, better than 51% of stainless steel grades); weldability poor (25/100); formability not recommended (8/100).
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. 1.4729 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4729
Is 1.4729 easy to machine?
Machine in the soft annealed state with sharp carbide tooling, rigid setups, low speeds and generous coolant; abrasive Cr carbides and high Si cause rapid flank wear.
Can 1.4729 be welded?
Air-hardening 0.4 %C 13Cr — preheat 250–350 °C, use matching or 309/Ni-base filler, keep interpass temperature and follow immediately with 700–750 °C tempering to avoid cracking.
Can 1.4729 be formed, bent or molded?
Supplied as sand or investment castings; not cold formable — control section thickness and feeding to avoid shrinkage porosity and hot tearing.
1.4729 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 |
|---|---|---|
| C | 0.3 – 0.5 | 0.4 |
| Sihigh Si for oxidation resistance | 1 – 2.5 | 1.8 |
| Mn | ≤ 1 | 0.6 |
| Cr | 12 – 14 | 13 |
| Niresidual | ≤ 1 | 0.3 |
| Pimpurity | ≤ 0.04 | |
| Simpurity | ≤ 0.03 | |
| Fe | balance |
What surface finishes work on 1.4729?
Shot blast and pickle/passivate scale after heat treatment; can be ground and lightly polished, but for long-term >850 °C service consider aluminide or ceramic coatings rather than plating.
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 1.4729 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- GX40CrSi13
How much does 1.4729 cost?
1.4729 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.
1.4729 — frequently asked
What is 1.4729 used for?
1.4729 is typically used for exhaust valve seats, turbocharger parts, heat-resistant fittings and furnace components. In short: harder 13Cr-Si casting grade; heat treatable to 21 HRC; 850 °C oxidation resistance.
What is the yield strength of 1.4729?
1.4729 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 64% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is 1.4729 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Machine in the soft annealed state with sharp carbide tooling, rigid setups, low speeds and generous coolant; abrasive Cr carbides and high Si cause rapid flank wear.
Can 1.4729 be welded?
Not readily — weldability is rated poor (25/100). Air-hardening 0.4 %C 13Cr — preheat 250–350 °C, use matching or 309/Ni-base filler, keep interpass temperature and follow immediately with 700–750 °C tempering to avoid cracking.
What surface finishes work on 1.4729?
Shot blast and pickle/passivate scale after heat treatment; can be ground and lightly polished, but for long-term >850 °C service consider aluminide or ceramic coatings rather than plating.
Can 1.4729 be formed, bent or molded?
Supplied as sand or investment castings; not cold formable — control section thickness and feeding to avoid shrinkage porosity and hot tearing.
What is the maximum service temperature of 1.4729?
1.4729 is rated for continuous use to about 850°C (1,562 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 1.4729-A and 1.4729-QT?
A is the default condition — standard delivery condition per EN 10295: lowest hardness (≤300 HB) for machining before service at high temperature. QT: choose when wear resistance and strength are needed at moderate temperature, e.g. valve seats and guides; toughness stays low. Yield strength is 420 MPa in A versus 750 MPa in QT.
How much does 1.4729 cost?
1.4729 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 10295 — Heat resistant steel castings — CEN (2002)
- EN 10027-2 — Material number 1.4729 designation system — CEN (2015)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Heat-resistant cast stainless steel grade datasheets (GX40CrSi13) — European steel foundries (2023)
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.