B24 · General Components
General Part Pool (High Frequency Parts Across Industries) with Stainless Steel Sheets: 304/316L Selection and 11 Item Lists
In the General Part Pool (High Frequency Parts Across Industries), we have organized 11 stainless steel parts commonly used: 304, 316L, or 316. Thickness ranges from 0.025–500 mm.
11 Item Lists and Material Recommendations
| Item / Part | Recommended Grade | Specifications / Thickness | Surface | Main Failure Modes | Reference Standards |
|---|---|---|---|---|---|
| Flanges (Welded/Butted/Nonspec) | 304/304L/316/316L/321/2205 | DN15–DN600；PN10–PN100 | 2B/Die Bright/Acid Pickling | Leakage at Seal Face + Intergranular Corrosion in Weld Heat Zone + Chloride Stress Corrosion Cracking | GB/T 9115/9119；NB/T 47010 |
| Pipe Fittings (Elbows/Tees/Diaphragms/Cardinals) | 304L/316L/321/310S | DN15–DN1200 | Pickled/Cut 2B | Erosion-Corrosion + Intergranular Corrosion at Welds + High-Temperature Oxidation | GB/T 12459；GB/T 12771；GB/T 19228.1 |
| Fasteners (bolts/nuts/screws/washers) | 302/303/304/305/316/A2-70/A4-70 | M3–M64 | Bright/Dark/Oil Coating | Cl⁻ Pitting+Fretting Corrosion+Hydrogen Embrittlement+Fatigue | GB/T 3098.6；ISO 3506 |
| Springs (conical/curved/precision small springs) | 301/304/316/17-7PH | Sheet Metal 0.05–3.0mm | Bright/2B | Stress Relaxation+Fatigue Fracture+Corrosion | GB/T 1972；GB/T 24588 |
| Bearings (raceway/rollers/cage) | 440C/304Keep Guard | Circle 1-20mm | Quenched + Polished | Contact Fatigue + Corrosion Pitting | GB/T 308.1；GB/T 1220 |
| Filter Materials (Woven Fabric/Braided Net/Sintered Mesh/Filters) | 304/316/316L/904L | 20-500 Mesh; Wire Diameter 0.025-0.5mm | Lacquered / Acid Wash / Electrolyzed | Blockage + Wear + Cl⁻ Corrosion | GB/T 17492；GB/T 3280 |
| Heat Exchangers (Tube Shell/Plate/Wavy Plate) | 304/316L/2205/2507 | Tube φ10-50mm; Plate 0.4-1.0mm | Acid Wash / Brighten / Engrave | Cl⁻ Pitting Hole + Crevice Corrosion + Tube Bundle Fatigue | GB/T 151；NB/T 47004 |
| Storage Tanks/Reactors/Batch Mixers | 304L/316L/904L/2205 | 3–30mm | 2B / Acid Wash / Electroplating | Medium Corrosion + Intergranular Corrosion at Welds + Mixing Fatigue | NB/T 47003.1；GB/T 3280 |
| Conveyor Belts / Net Belts / Chain Plates | 304/316/310S/314 | Wire diameter 1-3mm; Chain plate 0.8-2.0mm | B Grade/Lacquered/Drilled | Creep + Wear + Fatigue Fracture | GB/T 17492；GB/T 3280 |
| Rollers (conveying/offset/printing/furnace/pillow rolls) | 304/316L/2205/310S | Roll surface 3–30mm | Mirror finish/Dull finish/Grooved surface | Wear/Corrosion/High-temperature oxidation/Thermal fatigue | GB/T 3280; according to equipment standards |
| Cutting Tools/Sharpening | 420/440A/440C/9Cr18 | 1–12mm | Quenched and Polished | Wear on Edge/Breakage/Corrosion Fatigue | GB/T 1220；YY/T 0149 |
Inside isStandard Configuration.For the same part, different media, temperatures, and welding methods may require 304 (8), 316L (6), or 2205 (5) —— Clarifying usage conditions saves time without specifying grades directly.
Material Points
- The most common grades in this industry are 304 (8), 316L (6), and 316 (5) —— Numbers in parentheses indicate the number of parts involved, serving as a starting point for quoting and material preparation.
- Consider hardness for wear parts (edges, liners, conveyors) beyond just corrosion resistance (hit 5/11).
- Commonly corrosive sources are chloride ions and salts (pitting, crevice corrosion) (hit 4/11).
- Thickness range: 0.025–500 mm. Thin plates are formed parts (consider bend-back and deep drawing cracking), thick plates are welded structures (consider heat input and sensitization).
Common Issues
What stainless steel is most used in the general component pool (cross-industry high-frequency finished products)?
Out of a total of 11 components, 304 appears most frequently (8 hits), followed by 316L (6 hits) and 316 (5 hits). Specific parts still depend on media and temperature; for example, stainless steel countertops that come into contact with salt water should switch to 316L.
Which part is the most prone to problems?
Based on failure descriptions, typical issues are "flanges (butt weld/flat weld/non-standard)" with leakage at sealing surfaces + HAZ intergranular corrosion + Cl⁻ pitting; recommended grades: 304/304L/316/316L/321/2205, sizes DN15–DN600; pressures PN10–PN100. For these conditions, it's recommended to specify media concentration, temperature, and cleaning methods in the design phase.
What thickness should be selected?
The thickness range listed is 0.025–500 mm. Thin plates consider forming and surface quality, thick plates consider welding and structural strength; different manufacturers may have different values for the same part based on your drawings or operating conditions.
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