Stainless Steel 430F Hot Rolled
Finish state
AISI/SAE 430F · UNS S43020 · ASTM A582 · EN 1.4104, 1.4105 · JIS SUS430F
Cheapest large-diameter bar stock when the part is fully machined and only moderate strength is needed.
Values for the Hot Rolled condition
Other 430F tempers and conditions
430F is listed in 6 conditions; see the grade overview at 430F.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault softened bar/wire (EN +A) | Standard stocked condition for automatic-lathe turning and subsequent forming or heat treatment. | 380 | 550 | 25 | 175 HB | — |
Hot RolledThis page Hot Rolled (hot finished, unannealed bar) | Cheapest large-diameter bar stock when the part is fully machined and only moderate strength is needed. | 400 | 580 | 22 | 190 HB | 2.9 % IACS |
Quenched & tempered +QT650 | Use the higher-carbon EN 1.4104 variant when moderate strength plus better wear resistance is needed. | 500 | 750 | 12 | 22 HRC | 2.9 % IACS |
annealed and cold drawn bar (EN +C) | Choose for straight, close-tolerance bar with higher strength for screw-machine parts and shafts. | 550 | 660 | 15 | 235 HB | — |
Cold drawn, ground and polished bar (h9/h10 shafting) | Pick when the as-supplied OD is a functional surface — valve stems, guide pins, small shafts. | 550 | 660 | 15 | 22 HRC | 2.9 % IACS |
Hardened & tempered to 40–45 HRC | Maximum-hardness condition for wear surfaces, valve seats and small tooling; toughness and corrosion resistance drop. | 1,000 | 1,300 | 6 | 43 HRC | — |
What is 430F Hot Rolled?
430F Hot Rolled is 430F supplied in the Hot Rolled condition — cheapest large-diameter bar stock when the part is fully machined and only moderate strength is needed. 430F Hot Rolled has a yield strength of 400 MPa (58 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 57% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). 430F Hot Rolled has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F). Annealed is the default condition FabDigit quotes; Hot Rolled is available on request or by drawing note.
Advantages
- Easy to machine — 70/100, better than 98% of stainless steel grades
- Conducts heat well — 26 W/m·K (15 BTU/hr·ft·°F), better than 96% of stainless steel grades
- Low embodied carbon — 3.2 kg CO₂/kg, better than 95% of stainless steel grades
- High electrical conductivity — 2.9 % IACS, better than 87% of stainless steel grades
Limitations
- Difficult to weld — 20/100, worse than 95% of stainless steel grades
- Hard to polish — 50/100, worse than 93% of stainless steel grades
- Needs corrosion protection — 45/100, worse than 85% of stainless steel grades
- Limited formability — 25/100, worse than 78% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
430F Hot Rolled properties
Typical room-temperature values for 430F Hot Rolled; 21 are specific to this condition. Other listed values are 430F reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
430F Hot Rolled has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 83% of stainless steel grades. It melts at 1,425°C (2,597 °F).
Mechanical13
430F Hot Rolled has a yield strength of 400 MPa (58 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 57% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
430F Hot Rolled is rated for continuous service to 650°C (1,202 °F). It conducts heat at 26 W/m·K (15 BTU/hr·ft·°F), better than 96% of stainless steel grades. Thermal expansion is 10.4 µm/m·K (5.78 µin/in·°F).
Electrical3
430F Hot Rolled conducts electricity at 2.9 % IACS, better than 87% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 85% of stainless steel grades.
Sustainability4
Producing a kilogram of 430F Hot Rolled takes about 50 MJ of energy and emits 3.2 kg of CO₂ — less than 80% of stainless steel grades. Typical recycled content is 70%.
Manufacturability7
430F Hot Rolled's machinability is very good (70/100, better than 98% of stainless steel grades); weldability poor (20/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 430F Hot Rolled
Is 430F easy to machine?
Excellent free-cutting behavior — run 20–40 % faster than 430, use positive rake carbide, sharp tools and good chip evacuation; sulfides give short chips and clean threads.
Can 430F be welded?
Not recommended: sulfur promotes hot cracking and the HAZ coarsens/embrittles; if unavoidable, preheat 150–250 °C, use 309L filler and post-weld anneal.
Can 430F be formed, bent or molded?
Only light bending, upsetting or knurling — sulfide stringers cause transverse splitting; form generously radiused and avoid cold heading.
What surface finishes work on 430F?
Passivate (ASTM A967 nitric or citric) after machining to reduce sulfide-initiated rust; hard chrome, electroless nickel or black oxide are used where more corrosion or wear resistance is needed; mirror polishing shows inclusion pits.
430F 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 1.4104 runs 0.10–0.17 %C and is hardenable | ≤ 0.12 | 0.08 |
| Si | ≤ 1 | 0.5 |
| Mn | ≤ 1.25 | 0.8 |
| P | ≤ 0.06 | 0.03 |
| Sfree-machining addition; EN 1.4104 0.15–0.35 | ≥ 0.15 | 0.25 |
| Cr | 16 – 18 | 17 |
| Mooptional in S43020; EN 1.4104 specifies 0.20–0.60 | ≤ 0.6 | 0.4 |
| Niresidual, not specified in ASTM A582 | ≤ 0.5 | 0.3 |
| Fe | balance | — |
430F Hot Rolled — frequently asked
What is 430F Hot Rolled used for?
430F Hot Rolled is typically used for machined fittings, solenoid cores and armatures, valve components, shafts and pins, screw-machine fasteners and sensor and instrument bodies. In short: free-machining ferritic stainless.
What is the yield strength of 430F Hot Rolled?
430F Hot Rolled has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 57% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is 430F Hot Rolled easy to machine?
Yes — machinability is rated very good (70/100, better than 98% of stainless steel grades). Excellent free-cutting behavior — run 20–40 % faster than 430, use positive rake carbide, sharp tools and good chip evacuation; sulfides give short chips and clean threads.
Can 430F Hot Rolled be welded?
Not readily — weldability is rated poor (20/100). Not recommended: sulfur promotes hot cracking and the HAZ coarsens/embrittles; if unavoidable, preheat 150–250 °C, use 309L filler and post-weld anneal.
What surface finishes work on 430F Hot Rolled?
Passivate (ASTM A967 nitric or citric) after machining to reduce sulfide-initiated rust; hard chrome, electroless nickel or black oxide are used where more corrosion or wear resistance is needed; mirror polishing shows inclusion pits.
Can 430F Hot Rolled be formed, bent or molded?
Only light bending, upsetting or knurling — sulfide stringers cause transverse splitting; form generously radiused and avoid cold heading.
What is the maximum service temperature of 430F Hot Rolled?
430F Hot Rolled is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 430F Annealed and 430F-QT650?
Annealed is the default condition — standard stocked condition for automatic-lathe turning and subsequent forming or heat treatment. QT650: use the higher-carbon EN 1.4104 variant when moderate strength plus better wear resistance is needed. Yield strength is 380 MPa in Annealed versus 500 MPa in QT650.
Can FabDigit make parts in 430F Hot Rolled?
Yes — 430F Hot Rolled is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A582/A582M — Free-Machining Stainless Steel Bars — ASTM (2021)
- EN 10088-3 (X14CrMoS17, 1.4104) — CEN (2014)
- JIS G 4303 (SUS430F) — JSA (2021)
- GB/T 1220 (Y1Cr17) — SAC (2007)
- ASM Specialty Handbook: Stainless Steels — ASM International (1994)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels — ASM International (1990)
- Free-machining ferritic/martensitic stainless bar datasheets (1.4104) — Sandvik / Outokumpu (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.