254 Stainless Steel Welded Pipe
254 stainless steel welded pipe, commonly known as 254SMO welded pipe, is a type of super austenitic stainless steel welded pipe, corresponding to UNS number S31254 and German grade 1.4547. It belongs to the 6-molybdenum super stainless steel series and is named for its approximately 6% molybdenum content. It is not a duplex steel, but a high-alloy austenitic stainless steel, possessing extremely high resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking.
Specifications and Parameters Table
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Project |
Detailed Specifications |
Notes |
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Execution Standard |
ASTM A358 (welded pipe), ASTM A312, EN 10217-7 |
Standardized specifications ensure product quality and interchangeability. |
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Outer Diameter Range |
10mm - 3000mm |
Customizable special specifications, covering small to large diameters. |
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Wall Thickness Range |
0.5mm - 30mm |
Wall thickness grades: SCH5, SCH10, SCH40, SCH80, SCHXXS, etc. |
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Length Specification |
Fixed length 6m/12m, custom length, single length/double length |
Maximum length up to 12 meters; custom lengths available. |
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Welding Process |
TIG, MIG, plasma welding, high frequency welding |
Commonly uses TIG/MIG welding to ensure weld corrosion resistance; requires specialized welding wire such as ERNiCrMo-3. |
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Surface Treatment |
Acid pickling and passivation, industrial finish, frosted finish, mirror finish |
Acid pickling and passivation are standard treatments to improve corrosion resistance. |
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Connection Method |
Welding, flange connection, threaded connection |
Suitable for various installation scenarios. |
Key Characteristics and Applications
1. Corrosion Resistance: PREN value (pitting corrosion equivalent) ≥42.5, significantly higher than 316L (approximately 32), particularly suitable for seawater, high-chloride, and acidic media environments.
2. Mechanical Properties: Tensile strength ≥650MPa, yield strength ≥300MPa, elongation ≥40%.
3. Applicable Temperature: -196℃ to 400℃, excellent performance in medium and low temperature corrosive environments.
4. Typical Applications: Seawater desalination plants, marine engineering, chemical equipment, flue gas desulfurization systems, pulp and paper industry, high-purity pharmaceutical equipment.
Core Differences between 254 Stainless Steel Welded Pipes and 316L Stainless Steel Welded Pipes
1. Molybdenum Content: 254SMO contains 6% vs. 316L contains 2-3%.
2. Corrosion Resistance: 254SMO's pitting corrosion resistance is approximately twice that of 316L.
3. Price: 254SMO is significantly more expensive than 316L. 316L, approximately 3-5 times that amount.
Hot Tags: 254 Stainless Steel Welded Pipe, China, Manufacturer, Supplier, Factory
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