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S31050 VS S31000(310) Stainless Steel
S31050 stainless steel has a lower nickel content than S31000 stainless steel, which makes it less expensive overall. Additionally, the presence of a ferrite phase in S31050 stainless steel also improves mechanical properties, such as higher tensile strength and better toughness.
What is S31050 stainless steel?
S31050 stainless steel pipe (SS 1.4466), also known as "Lean Duplex", is a type of stainless steel that contains both austenite and ferrite phases. This gives it high strength and excellent corrosion resistance. Additionally, AISI 310 MoLN stainless steel has a strong resistance to stress corrosion cracking, making it a popular choice for high stress applications.
What is 310 stainless steel?
310 stainless steel pipe (S31000, 1.4841), also known as "25-20", is a high temperature austenitic stainless steel known for its excellent oxidation resistance. The S31000 material contains high levels of chromium and nickel, giving it exceptional strength and durability in extremely hot conditions.
Chemical Composition: The Role of Nitrogen and Moly
| Element | S31000 (310) | S31050 (310MoLN) | Why it matters? |
| Chromium (Cr) | 24.0 – 26.0% | 24.0 – 26.0% | Both provide excellent base corrosion resistance. |
| Nickel (Ni) | 19.0 – 22.0% | 21.0 – 23.0% | S31050 has higher nickel for better stability. |
| Molybdenum (Mo) | - | 2.0 – 3.0% | Critical: Mo gives S31050 its urea-grade status. |
| Nitrogen (N) | - | 0.10 – 0.16% | Enhances strength and pitting resistance. |
Applications Vary
AISI 310 stainless steel pipe is often used in high-temperature environments such as furnace components, heat exchangers, and piping systems. It is also used in the manufacture of kilns, radiant tubes, and other similar applications.
AISI 310 MoLN stainless steel is frequently used in chemical and petrochemical applications, offshore oil and gas production, and pulp and paper production.
FAQ for S31050 vs. S31000 (310 Stainless)
Q: Is S31050 the same as 310MoLN?
A: Yes. S31050 is the UNS designation, while 310MoLN is the common industry name. The "MoLN" indicates the addition of Molybdenum and Nitrogen with Low Carbon, specifically designed for urea-grade applications.
Q: Can I use S31000 in a Urea plant?
A: It is not recommended. While S31000 has high heat resistance, it lacks the Molybdenum and specialized nitrogen balance required to resist carbamate corrosion found in urea synthesis. S31050 is the standard for those environments.
Q: What is the maximum service temperature for S31000?
A: S31000 can withstand temperatures up to 1100°C (2012°F) in continuous service, provided the atmosphere is oxidizing and not subject to heavy reducing gases.
Q: Does S31050 require special welding filler metals?
A: Yes. To maintain the corrosion resistance of the urea grade, you should use matching 25Cr-22Ni-2Mo welding consumables to ensure the weld seam is as resistant as the base metal.
