Stainless Steel Raw Material 1.4057 SUS431 With EN10204 3.1
Certificate Hardness Min 180HB OD 50mm
431 Stainless Steel (UNS S43100) – Composition, Properties and Uses
UNS S43100 is a type of martensitic stainless steel alloy. It’s
composed mainly of iron, chromium, and nickel, with small amounts
of silicon, phosphorus, sulfur, and manganese. It’s magnetic and
has good corrosion resistance. In this article, we’ll discuss the
composition and physical and mechanical properties of 431 stainless
steel and its uses.
431 Stainless Steel Composition
The composition of 431 ss is as follows: iron (Fe) 74-78%, chromium
(Cr) 15-17%, nickel (Ni) 1-1.5%, silicon (Si) 0.75%, phosphorus (P)
0.04%, sulfur (S) 0.03%, manganese (Mn) 0.75%.
| Grade 431 stainless steel | C | Mn | Si | P | S | Cr | Ni |
| 431 | min. max. | – 0.20 | – 1 | – 1 | – 0.04 | – 0.03 | 15 17 | 1.25 2.50 |
431 Stainless Steel Physical Properties
One of the main benefits of stainless steel 431 is its excellent
corrosion resistance due to the presence of high chromium content
in its composition. It also has good ductility and formability,
making it easy to shape into different objects and components.
Additionally, it has good wear resistance, which makes it a
preferred material for many industries, such as automotive
manufacturing or food processing equipment, where parts are subject
to wear from constant use or exposure to corrosive environments.
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat
0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) |
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C |
| 431 | 7800 | 200 | 10.2 | 12.1 | – | 20.2 | – | 460 | 720 |
431 Stainless Steel Mechanical Properties
In terms of mechanical properties, 431 alloy has a tensile strength
between 620 MPa and 780 MPa, an ultimate strength between 520 MPa
and 680 MPa, an elongation at the break between 30% and 40%, a
modulus of elasticity around 190 GPa and a yield strength between
240MPa and 380MPa depending on the condition.
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Brinell (HB) | Impact Charpy V (J) |
| Annealed * | 862 | 655 | 20 | 285 max | – |
| 204 | 1345 | 1055 | 20 | 388 | 50 |
| 316 | 1295 | 1035 | 19 | 375 | 53 |
| 427 | 1350 | 1080 | 19 | 388 | # |
| 538 | 1140 | 965 | 19 | 321 | # |
| 593 | 1015 | 770 | 20 | 293 | 64 |
| 650 | 960 | 695 | 20 | 277 | 84 |
431 Stainless Steel Equivalent
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 431 | S43100 | 431S29 | 57 | 1.4057 | X17CrNi16-2 | 2321 | SUS 431 |
431 Stainless Steel Uses
Due to its combination of physical properties such as corrosion
resistance, formability, and wear resistance, grade 431 is used in
many industries, including automotive manufacturing, where it can
be found in exhaust systems or other parts that require good
corrosion resistance but also need to be strong enough not to break
easily under pressure or stress from daily use; food processing
equipment where parts may be exposed to corrosive chemicals but
still need to be able to withstand regular usage; surgical
instruments that require both strength and corrosion resistance; or
marine applications like pumps or valves that must be able to
withstand frequent exposure to saltwater without corroding quickly
over time.
Conclusion
Overall, 431 stainless steel is an excellent choice for
applications requiring good corrosion resistance combined with high
strength at an affordable cost. Its composition allows it to
maintain its physical properties even when exposed to harsh
conditions while still providing superior wear resistance compared
to other materials available on the market today. Whether you need
it for automotive parts, food processing equipment or marine
applications – 431 stainless steel can provide you with the
performance you need at an affordable price point!
