Stainless Steel 1.4029
EN 1.4029
1.4029 (X29CrS13) is the sulphurised free-machining counterpart of 1.4028, a 13% Cr martensitic stainless with about 0.2% S added to break chips; machinability rates 65 against 50 for the unsulphurised grade.
Reference datasheet — 1.4029 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
1.4029 tempers and conditions
1.4029 is supplied in 6 conditions, soft to hard. +A 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 |
|---|---|---|---|---|---|---|
+ADefault Annealed | Standard stocked bar condition: softest state for heavy automatic-lathe turning before hardening. | 450 | 740 | 15 | 215 HB | — |
Quenched and tempered, Rm 750–900 MPa | Lowest-strength Q&T class: pick when toughness and dimensional stability matter more than hardness. | 600 | 810 | 12 | 23 HRC | — |
Cold drawn | Choose for close-tolerance bright bar feeding Swiss/CNC automatics where no further hardening is planned. | 620 | 830 | 10 | 24 HRC | 3 % IACS |
Quenched and tempered, Rm 800–950 MPa | Mid Q&T class for shafts, spindles and valve stems needing balanced strength and machinability. | 640 | 870 | 11 | 26 HRC | — |
Quenched and tempered, Rm 850–1000 MPa | Standard delivered Q&T class of EN 10088-3 for this grade — highest tempered strength still supplied as bar. | 700 | 920 | 10 | 28 HRC | — |
Hardened & low-temperature tempered | Part-level treatment (1000–1050 °C oil/air quench + 150–250 °C temper) for wear faces, cutlery bolsters and valve seats. | 1,350 | 1,600 | 3 | 50 HRC | — |
What is 1.4029?
1.4029 (X29CrS13) is the sulphurised free-machining counterpart of 1.4028, a 13% Cr martensitic stainless with about 0.2% S added to break chips; machinability rates 65 against 50 for the unsulphurised grade. It is a turning-bar grade for high-volume screw-machine parts that still need hardening, supplied in +A, +C, +QT750, +QT800, +QT850 and a hardened low-temper condition, with default values near 450 MPa yield, 740 MPa tensile, 15% elongation and 215 HB and service to 400 °C. The sulphides cut corrosion resistance (score 22) and formability (score 25), and the grade is effectively unweldable; use 1.4028 where corrosion or weld integrity matters. 1.4029 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). 1.4029 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 215 GPa (31.2 Msi).
What is 1.4029 used for?
- valve stems
- screws
- turned stainless components
Advantages
- Conducts heat well — 30 W/m·K (17.3 BTU/hr·ft·°F), better than 99% of stainless steel grades
- High electrical conductivity — 3.1 % IACS, better than 99% of stainless steel grades
- Easy to machine — 65/100, better than 98% of stainless steel grades
- Low embodied carbon — 3.4 kg CO₂/kg, better than 91% of stainless steel grades
Limitations
- Needs corrosion protection — 22/100, worse than 100% of stainless steel grades
- Hard to polish — 35/100, worse than 100% of stainless steel grades
- Difficult to weld — 12/100, worse than 99% of stainless steel grades
- Limited ductility — 15%, worse than 89% of stainless steel grades
- Low fracture toughness — 60 MPa·√m (54.6 ksi·√in), worse than 88% of stainless steel grades
1.4029 properties
Typical room-temperature values for 1.4029-+A; bars are the position among stainless steel grades.
Physical3
1.4029 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
1.4029 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 70% of stainless steel grades. Elongation at break is 15% and the elastic modulus is 215 GPa (31.2 Msi).
Thermal6
1.4029 is rated for continuous service to 400°C (752 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), better than 99% of stainless steel grades. Thermal expansion is 10.5 µm/m·K (5.83 µin/in·°F).
Electrical3
1.4029 conducts electricity at 3.1 % IACS, better than 99% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is poor (22/100), worse than 100% of stainless steel grades.
Sustainability4
Producing a kilogram of 1.4029 takes about 40 MJ of energy and emits 3.4 kg of CO₂ — less than 97% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
1.4029's machinability is good (65/100, better than 98% of stainless steel grades); weldability not recommended (12/100); formability poor (25/100).
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. 1.4029 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 1.4029
Is 1.4029 easy to machine?
Excellent for a stainless: carbide or HSS, sharp positive geometry, 90–140 m/min in +A; sulfides give short chips and long tool life, but tool pressure rises sharply above 28 HRC.
Can 1.4029 be welded?
Not recommended — high carbon plus 0.2 % S causes hot cracking and brittle martensite; if unavoidable, preheat 250–300 °C, 309/410NiMo filler, immediate 700–750 °C temper.
Can 1.4029 be formed, bent or molded?
Essentially a machining bar grade; cold bending, heading or deep drawing will crack — hot form 1100–850 °C then slow cool and re-anneal.
1.4029 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 10088-3 | 0.25 – 0.32 | 0.29 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 1.5 | 0.8 |
| P | ≤ 0.04 | 0.03 |
| Sdeliberate sulfur addition for free machining | 0.15 – 0.25 | 0.2 |
| Cr | 12 – 13.5 | 12.8 |
| Mooptional residual/addition | ≤ 0.6 | 0.1 |
| Niresidual, mill practice | ≤ 0.5 | 0.2 |
| Fe | balance |
What surface finishes work on 1.4029?
Passivate in nitric acid after machining (sulfide pits bleed rust otherwise), hard chrome or nitriding for wear; high-gloss polishing is poor because MnS stringers pull out.
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 1.4029 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- X29CrS13
- Similar grades
- Y3Cr13
How much does 1.4029 cost?
1.4029 is a standard-cost stainless steel ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
1.4029 — frequently asked
What is 1.4029 used for?
1.4029 is typically used for valve stems, screws and turned stainless components. In short: best-machining martensitic stainless; free-machining version of 1.4028; lowest corrosion rating in family.
What is the yield strength of 1.4029?
1.4029 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 740 MPa (107 ksi) — stronger than 70% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 1.4029 easy to machine?
Reasonably — machinability is rated good (65/100, better than 98% of stainless steel grades). Excellent for a stainless: carbide or HSS, sharp positive geometry, 90–140 m/min in +A; sulfides give short chips and long tool life, but tool pressure rises sharply above 28 HRC.
Can 1.4029 be welded?
Not readily — weldability is rated not recommended (12/100). Not recommended — high carbon plus 0.2 % S causes hot cracking and brittle martensite; if unavoidable, preheat 250–300 °C, 309/410NiMo filler, immediate 700–750 °C temper.
What surface finishes work on 1.4029?
Passivate in nitric acid after machining (sulfide pits bleed rust otherwise), hard chrome or nitriding for wear; high-gloss polishing is poor because MnS stringers pull out.
Can 1.4029 be formed, bent or molded?
Essentially a machining bar grade; cold bending, heading or deep drawing will crack — hot form 1100–850 °C then slow cool and re-anneal.
What is the maximum service temperature of 1.4029?
1.4029 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 1.4029 cost?
1.4029 is a standard-cost stainless steel ($$), cheaper than about 71% 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 — Technical delivery conditions for semi-finished products, bars, rods, sections — CEN (2014)
- EN 10088-1: Stainless steels — List of stainless steels (physical properties) — CEN (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- GB/T 1220 (Y3Cr13 free-machining martensitic bar) — SAC (2007)
- Free-machining martensitic bar (X29CrS13 / 420F) datasheets — Sandvik / Böhler / Outokumpu (2022)
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.