C37 · Rail, Marine & Aerospace

Stainless Steel Plates for Rail, Ship, Aerospace and Other Transportation Equipment Manufacturing: 301L/304 Selection and 10 Part List

Q: Which stainless steel is used most in railway, shipbuilding, aerospace, and other transportation equipment manufacturing?

Top 10 by frequency: 301L (3 items), 304 (3 items), 2205 (2 items). Specific to a part still depends on the medium and temperature, for example, stainless steel countertops that contact salt water should switch from 304 to 316L.

Q: Which parts are most prone to problems?

By failure description, typical is "body side wall (corrugated plate + exterior plate)": improper laser overlay weld penetration → insufficient fatigue strength; residual welding stress; weld width ≥ 1 times plate thickness, fusion depth ≤ 0.5 times plate thickness, protrusion < 0.05 mm; recommended grade SUS301L (LT/DLT/ST/MT/HT), specifications corrugated plate/exterior plate 1–2 mm; typical overlay welding of 2mm + 2mm. This condition recommends specifying medium concentration, temperature, and cleaning method in the design phase.

Q: What thickness should I choose?

The listed thickness range is 0.5–10 mm. Thin plates consider forming and surface properties, thick plates consider welding and structural strength; different manufacturers may have different values for the same part, review your drawings or conditions to confirm.

In rail, ship, aerospace and other transportation equipment manufacturing, we have compiled 10 parts that use stainless steel. Commonly used are 301L / 304 / 2205 with thickness ranging from 0.5–10 mm.

Explain operating conditions to get material recommendations View Products

Car Exhaust System Ferritic Stainless Steel Manifolds and Silencers — Automotive Exhaust and Decorative Parts: 409 / 441 / 304 / 430 (Illustration; Material selection based on media, temperature, and drawings)

List of Ten Components and Materials

Component / Part	Recommended Grade	Specification / Thickness	Surface	Main Failure Modes	Reference Standards
Body Side Wall (Welded Panel + Exterior Panel)	SUS301L（LT/DLT/ST/MT/HT）	Welded Panel/Exterior Panel 1–2mm; 2mm+2mm Double Weld Typical	Rustled / 2B	Laser Overlay Poorly Controlled Melting Depth → Fatigue Strength Insufficient; Welding Residual Stress; Weld Width ≥ 1 times Plate Thickness, Melting Depth ≤ 0.5 times Plate Thickness, Surface Protrusion < 0.05mm	EN 12663; Laser Overlay Patent Process
Body Cold Formed Channel Steel Beams / Pillars	301L Cold Rolled Strip Steel	Strip 1–3mm	2B / Rustled	Cold Forming Sag + Welding Deformation + Fatigue	EN 12663；GB/T 3280
Interior Panels / Cargo Rails / Seat Frames	304/301L	0.5–2.0mm	HL/No.4/2B	Human Contact Corrosion + Cleaning Agents + Wear	GB/T 3280；EN 45545
Doors / Window Frames / Sealing Elements Frames	304/301L	0.8–2.0mm	2B / Rustled	Frequent opening fatigue + sealing strip aging + corrosion	GB/T 3280；EN 14752
Ship exhaust gas scrubber tower body / spray layer	2205/2507/254SMO/904L	2–6mm	2B/acid wash	Acid seawater pH 2–4 + high Cl⁻ + wear → pitting/electrochemical corrosion	ASTM A240; classification society requirements
Ballast water system piping / filters	2205/2507/1.4529	Wall thickness 2–10mm	Acid wash	High chloride seawater + stagnation + microbial corrosion	ASTM A240/A789; classification society requirements
Aircraft hydraulic / fuel lines	304L/316L/21-6-9	1/8″–2″; wall thickness 0.5–2mm	Bright/dull finish	High pressure hydraulic oil + low temperature + vibration fatigue + coastal chloride	ASTM A269；SAE AS4076
Engine exhaust components / tailpipes	321/347/310S/nickel-based	0.5–3mm	2B/Polished	High Temperature Oxidation+Thermal Fatigue+Gas Corrosion	ASTM A240; AMS Aerospace Material Specifications
Aerospace Fasteners/Structures	A286/17-4PH	M3–M20	Passivation/Treatment	High Strength+Stress Corrosion+Cryph+Fatigue	ASTM A453；AMS 5643
Motorcycle Exhaust Systems/Bicycle Frames	409L/304/430	0.8–2.0mm	2B/Glazed/Treated	Condensation Acid Corrosion+Road Salt Fog+Vibration Fatigue	ASTM A240；GB/T 3280

Table BelowStandard Configuration. Same part can switch from 304 to 316L or 2205 based on usage conditions, which is more convenient than specifying grades.

Material Selection Tips

Most common grades in this industry are 301L (3), 304 (3), and 2205 (2)— the numbers in parentheses indicate how many parts they apply to as a starting point for quoting and material procurement.
Chlorides and salts are the most common corrosion sources (pitting, crevice corrosion) (4/10 hits).
Wear components (edges, liners, conveying pieces) need hardness consideration, not just corrosion resistance (2/10 hits).
Minimum thickness 0.5–10 mm: Thin plates are mostly formed parts (considering bend back-arc and deep drawing cracking), thick plates are mostly welded structural parts (considering heat input and sensitization).

Common Issues

Which stainless steel is used most in railway, shipbuilding, aerospace, and other transportation equipment manufacturing?

Top 10 by frequency: 301L (3 items), 304 (3 items), 2205 (2 items). Specific to a part still depends on the medium and temperature, for example, stainless steel countertops that contact salt water should switch from 304 to 316L.

Which parts are most prone to problems?

By failure description, typical is "body side wall (corrugated plate + exterior plate)": improper laser overlay weld penetration → insufficient fatigue strength; residual welding stress; weld width ≥ 1 times plate thickness, fusion depth ≤ 0.5 times plate thickness, protrusion < 0.05 mm; recommended grade SUS301L (LT/DLT/ST/MT/HT), specifications corrugated plate/exterior plate 1–2 mm; typical overlay welding of 2mm + 2mm. This condition recommends specifying medium concentration, temperature, and cleaning method in the design phase.

What thickness should I choose?

The listed thickness range is 0.5–10 mm. Thin plates consider forming and surface properties, thick plates consider welding and structural strength; different manufacturers may have different values for the same part, review your drawings or conditions to confirm.

Related materials and adjacent industries

304Material and specifications 2205Material and specifications 304LMaterial and specifications 316LMaterial and specifications 321Material and specifications 430Material and specifications Agricultural and food processing industryFood Processing Food ManufacturingFood Manufacturing Manufacturing of Wine, Beverages, and Specialty TeaBeverage & Brewing

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