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Stainless steel grade 310 MoLN is a fully austenitic stainless steel that does not have intermetallic phases such as intergranular carbide precipitations. The 310MoLN steel grade has an optimized chemical composition designed specifically for applications in urea plants. The nitrogen in the chemical composition helps to stabilize and strengthen the austenitic phase. This material provides improved corrosion-resistance in urea carbamate environments such as high-pressure strippers.
Chemical Composition
The chemical composition of stainless steel grade 310 MoLN is outlined in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | Balance |
| Chromium, Cr | 24-26 |
| Nickel, Ni | 21-23 |
| Molybdenum, Mo | 2-2.50 |
| Manganese, Mn | ≤ 2 |
| Nitrogen, N | 0.10-0.16 |
| Silicon, Si | ≤ 0.70 |
| Phosphorous, P | 0.025 |
| Carbon, C | ≤ 0.020 |
| Sulfur, S | ≤ 0.010 |
| Grade | UNS | DIN | EN | AMS | GB | JIS | |
| 310Moln | S31050 | - | 1.4466 | - | - | - | |
| EURONORM/DIN | WERKSTOFF NR. | AISI | UNS | BRAND NAME |
| X2 CrNiMo 18-14-3 | 1.4435 | 316LUG | S31603 | 316L MOD UREA 3R60 UREA GRADE |
| X1 CrNiMoN 25-22-2 | 1.4466/1.4465 | 310 MoLN | S31050 | 25.22.2 |
| 1.4477 | S32906 | DMV 29.7 |
Characteristic
Excellent resistance to corrosion in ammonium carbamate
Excellent resistance to intergranular corrosion
High resistance to pitting and crevice corrosion
Good weldability
General corrosion
S31050 was originally developed for stripper tubes used in the production of urea.
S31050 has excellent corrosion resistance in urea/carbamate solutions at high pressures andtemperatures.
S31050 is also highly resistant to inorganic acids
Intergranular corrosion
S31050 ishighly resistant to intergranular corrosion after welding.
Pitting and crevice corrosion
S31050 has very good resistance to pitting, and is also far more resistant to crevice corrosion than ASTM 316L.
Stress corrosion cracking (SCC)
Conventionalausteniticstainless steels of type ASTM 304 and 316 are susceptible to stress corrosion cracking (SCC) in chloride- bearing solutions at temperatures exceeding about 60°C (140°F). The higher nickel content makes S31050 slightly more resistant
Erosion corrosion
The good mechanical strength of S31050 makes it resistant to erosion-corrosion. Ferrules for urea strippers are oneapplicationwhere this property is utilised.
Weldability
Theweldability of S31050 is good. Welding must be carried out without preheating, and normally there is noneed for any subsequent heat treatment.
S31050 has lowthermal conductivity and high thermal expansion.
Mechanical Properties
The mechanical properties of stainless steel grade 310 MoLN are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 540-740 MPa | 78320- 107327 psi |
| Proof strength | 250 MPa | 36259 psi |
| Modulus of elasticity (20°C) | 195 GPa | 28282 ksi |
| Elongation at break (In 2", 50% cold worked) | 40% | 40% |
| Hardness, Brinell | 95 | 95 |
Applications
Striper Tubes
Outerlayer of bimetallic
Ferrules
Carbamate Condensers
Decomposers
Reactor Coils
Company Profile
Zhongzheng Stainless Steel Co., Ltd. was established in 2018 with aregistered capital of 20 million yuan. lt is a manufacturing company thatintegrates the production of special materials, manufacturing andprocessing, sales, and technology development. The company covers anarea of 2,000 square meters and has 200 employees. it has built worldclass stainless steel seamless pipe (hot piercing, cold drawing, cold rollingproduction lines, precision steel pipe production lines, and large, mediumand small-sized welded pipe production lines. The company has beencommitted to providing high performance, high precision, hightemperature-resistant, high pressure-resistant, and corrosion-resistantsolutions and technical services for industrial equipment pipeline systems.The company specializes in producing a series of steel pipes, pipe fittingsflanges, etc., such as high-temperature (nickel-based) alloys, austeniticduplex steel, urea grade stainless steel, super stainless steel, etc. Thecompany is equipped with an annual production capacity of 5,000 tons ofstainless steel seamless pipe production line, 7,000 tons of welded pipeproduction line, and 500 tons of pipe fittings production line, etc. lt canoroduce stainless steel seamless pipes with diameters ranging from Φ6 toΦ762 and wall thicknesses ranging from 0.5 to 70 mm, stainless steelwelded pipes with diameters ranging from Φ15 to Φ2200 and wallthicknesses ranging from 0.5 to 80 mm, pipe fittings, and various stainlesssteel ingots, round steel, rough pipes, etc., according to customerrequirements and in accordance with standards such as GB, ASTM, etc.
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