Stainless Steel - Grade 430F-Mod / 1.4104
Description
430F-Mod / 1.4104 is a free-machining ferritic stainless steel grade, known for its improved machinability compared to standard 430 due to the addition of sulfur. It is primarily used in applications requiring moderate corrosion resistance and good formability, but it does not respond to heat treatment.
Chemical Composition
The typical chemical composition of 430F-Mod is as follows:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.12 (max) |
| Manganese (Mn) | 1.25 (max) |
| Silicon (Si) | 1.00 (max) |
| Phosphorus (P) | 0.06 (max) |
| Sulfur (S) | 0.15 (min) |
| Chromium (Cr) | 16.0 - 18.0 |
| Iron (Fe) | Balance |
Mechanical Properties
The mechanical properties of 430F-Mod / 1.4104 are as follows:
| Property | Value |
|---|---|
| Yield Strength (0.2% Proof) | 379 MPa (min) |
| Tensile Strength | 552 MPa (min) |
| Elongation (% in 50mm) | 25 (min) |
| Hardness (Brinell) | 262 (max) |
Thermal & Physical Properties
The thermal and physical properties include:
| Property | Value |
|---|---|
| Density | 7750 kg/m³ |
| Thermal Conductivity | 11.0 W/m•K |
| Modulus of Elasticity | 200 GPa |
| Coefficient of Thermal Expansion | 10.4 µm/m/°C |
| Electrical Resistivity | 360 nΩ•m |
| Thermal Conductivity | 11.0 W/m•K |
Other Designations
- UNS: S43020
- DIN : 1.4104
- JIS: SUS 430F
- AFNOR: Z 13 CF 17
- GOST: 12Ch17
- BS: 430S15
Fabrication and Heat Treatment
430F-Mod is not hardenable by heat treatment. It can be cold worked through moderate operations. Welding is possible but not recommended due to the sulfur content, which can lead to reduced mechanical properties.
Applications
Common applications of 430F-Mod / 1.4104 include:
- Automotive parts
- Fasteners (bolts, screws, nuts)
- Valve and pump bodies
- Machine parts and cutlery
- Petrochemical equipment
- Gears and shafts
Supplied Forms
430F-Mod is available in various forms, such as:
- Round bars
- Square bars
- Hexagonal bars
- Flat bars
- Seamless and welded pipes
- Hot and cold rolled plates and sheets
- Forged bars and flanges
Features
- Excellent machinability due to sulfur content
- Moderate corrosion resistance
- Good formability
- Limited weldability
- Not suitable for heat treatment
This datasheet provides a comprehensive overview of the 430F-Mod grade, suitable for engineers and designers in selecting materials for specific applications.