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The 200 and 300 series NITRONIC alloys contain between 16% and 30% chromium and 2% to 20% nickel for improved surface quality, formability, corrosion and wear resistance. Heat can not harden austenitic alloys. These stainless steels are the most widely used due to their superior formability and corrosion resistance. All austenitic steels are nonmagnetic when annealed. Depending on their composition, some austenitics are magnetic when cold worked.
Nitronic 60 is a metal that can be used for a variety of applications. This fully austenitic alloy was originally intended to be used as a high-temperature alloy, and as a result, it exhibits excellent high-temperature properties at temperatures up to 1800 oF. Nitronic 60 has an oxidation resistance that is comparable to Type 309 S.S. and significantly superior to Type 304 S.S. The wear and galling resistance of this grade are among its most notable characteristics. The additions of silicon and manganese have created a matrix in this alloy that prevents wear, galling, and fretting even when the alloy is in the annealed state. Cold working the material results in higher strengths, and it retains its full austenitic properties even after extensive cold working is done. This process does not improve the anti-galling properties of carbon steels or some stainless steels, as is typical for these materials. Adding cold or hot work to the material results in increased strength and hardness, while the wear resistance does not decrease noticeably as a result of the process.The addition of chromium and nickel makes it corrosion resistant to the same extent as 304 and 316 stainless steels while having approximately twice the yield strength.
| Weight % | C | Si | Mn | S | P | Cr | Ni | Mo | Nb | V | N |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min. | 4,00 | 20,50 | 11,50 | 1,50 | 0,10 | 0,10 | 0,20 | ||||
| Max. | 0,06 | 1,00 | 6,00 | 0,030 | 0,040 | 23,50 | 13,50 | 3,00 | 0,30 | 0,30 | 0,40 |
| Yield strength Rp0.2,MPa | Elongation[%] | Hardness[HB] | |||
|---|---|---|---|---|---|
| BAR | ≥ 345 | ≥ 655 | ≥ 35 | ≤ 293 | 230 |
| 201 | |||||
| version* | ≥ 586 | ≥ 896 | ≥ 20 | ≤ 330 |
The combination of corrosion resistance and mechanical strength is utilized in marine hardware, pump shafting, petrochemical, pulp & paper, food processing and petroleum industries. Can also be used in “down hole” applications due to sulfide stress cracking resistance. Field service experience have shown that NITRONIC 50 stainless has excellent resistance to sulfide stress cracking in air conditions. NITRONIC 50 in both the annealed and high-strength (hot rolled) conditions has been included in NACE Standard MR01-75/ ISO 15156-3 “Sulfide Stress Cracking Resistant Metallic Material for Oil Field Equipment,” at hardness levels up to HRc 35 maximum.