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AISI 430 F
AISI 430 F is a tempered martensitic chromium steel that is resistant to rust and acid. The addition of sulfur improves machinability, but the corrosion resistance is reduced by the sulfur despite the high chromium content.
The main use of AISI 430 F stainless steel is in media that cause pitting or crevice corrosion. In addition, due to its excellent machinability, this stainless steel is used in the automotive industry, spindle and screws, hydraulics and as structural parts in water and steam.
In the manufacture of screws, axles, spindle and nuts and fittings, stainless steel alloy 430f steel magnetic is also used.
Overview of the most important steel
SS 2383, UNS S43020, AFNOR Z13CF17, BS 441S29, UNI X10CrS17, JIS SUS430F, GB Y10Cr17, 1.4104
Chemical composition
| AISI 430F X14CrMoS17 |
C | Si | Mn | P | S | Cr | Mo | Ni | Ti |
| min. | 0,10 | 0,15 | 15,5 | 0,20 | |||||
| max. | 0,17 | 1,0 | 1,50 | 0,04 | 0,35 | 17,5 | 0,60 |
Characteristics
| Weldability | bad |
| Machinability | good 7 (1 = poor – 10 = good) |
| Polishing | not possible |
| Corrosion resistance | low |
| Corrosion class | 2 (0 = weak – 5 = good) |
| Magnetisability | available |
Forging
Care is required during forging, as a ferritic-austenitic microstructure is formed due to the high sulfur content. During forging, the martensitic material is heated slowly to 850°C, with a progressive increase to 1,100°C – 1,130°C. The forging process takes place at 1,130°C and 750°C.
Welding
AISI 430f steel is usually not welded. The mechanical-technological values in the weld seam and the heat-affected zone can be very different from the base material without additional post-weld heat treatment.
Soft annealing
Soft annealing of the material takes place at 750°C to 850°C. This is followed by furnace or air cooling.
Corrosion resistance
The high content of sulfur affects the corrosion resistance of AISI 430F.
Cold forming
Cold forming is possible with SS 430F stainless steel.
Hardening
The ferritic steel can be hardened at 950°C to 1070°C. The subsequent cooling should be carried out in the cooling water. Subsequent cooling should be carried out in the media of polymer, oil or air.
Heat treatment
| Temperature in °C | Cooling | |
| Hot forming | 1.100 – 800 | air |
| Heat treatment | ||
| Soft annealing (+ A) | 750 – 850 | furnace, air |
| Tempering (+ QT) | ||
| Hardening | 950°C – 1.070°C | polymer, oil, air |
| Tempering (+ QT650) | 550°C – 650°C | air |
Processing
| Cold forming | is possible |
| Spent processing | is possible |
| Cold heading | uncommon |
| Free-form and drop forging | rare |
| Polishing | not possible |
Physical Properties
| Density in kg/dm3 | 7,7 |
| Electrical resistance at 20°C in (Ω mm2)/m | 0,7 |
| Thermal conductivity at 20°C in W/(m K) | 25 |
| Specific heat capacity at 20°C in J/(kg K) | 460 |
Produced to the highest Standards
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