439
Type 439 (also known as ASTM XM-8) is a ferritic stainless steel designed to resist corrosion in a variety of oxidizing environments from fresh water to boiling acids.
| USA | JP | DE | EUR | CN |
|---|---|---|---|---|
| ASTM | JIS | DIN | EN | GB |
| 439 | SUS439 | X6CrTi17 | 1.4510 | 022Cr18Ti |
Chemical Composition
The typical chemical composition is shown in the table below.
| Grade | Standard | 439 Chemical Composition | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | Cr | Ni | P | S | Mo | Others | ||
| ≤ % | ≤ % | % | % | % | ≤ % | ≤ % | ≤ % | % | ||
| 439 | ASTM A240 | 0.03 | 1 | 1 | 17 - 19 | 0.5 | 0.04 | 0.03 | - | - |
| 1.451 | EN 10088-2 | 0.05 | 1 | 1 | 16 - 18 | - | 0.04 | 0.015 | - | Ti: 0.15 - 0.8 | N≤ 0.03 |
| SUS439 | JIS G 4304 | JIS G 4305 | 0.03 | 0.75 | 1 | 16 - 19 | - | 0.04 | 0.03 | - | Ti: 0.1 - 1.0 |
Mechanical Properties
The mechanical properties are given in the table below.
| Grade | Standard | 439 Mechanical Properties | ||||
|---|---|---|---|---|---|---|
| Tensile Strength | Yield Strength 0.2% | Elongation >% | Hardness | |||
| (MPa) ≥ | (MPa) ≥ | HRB ≤ | HB ≤ | |||
| 439 | ASTM A240 | 415 | 205 | 22 | 89 | 183 |
| 1.451 | EN 10088-2 | 420 | 230 | 23 | - | - |
| SUS439 | JIS G 4304 | JIS G 4305 | 360 | 175 | 22 | 88 | 183 |
Properties & Typical Applications
Type 439 is a titanium stabilised 18% chromium alloy that can be used in many oxidising environments.Type 439 does not require annealing after welding to restore ductility or to provide intergranular corrosion resistance. Type 439 also has superior formability capabilities and is heavily used in the automotive industry; it can be work hardened slightly to increase tensile strength.