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Stainless Iron Strip/Sheet SUS410/420/430 Supply | 0.05–3.5mm Full Range

Publish Time: 2026-03-14 14:27:13

Many people confuse stainless iron with stainless steel. In fact, stainless iron grades like SUS410, 420, and 430 are far more affordable than 304 stainless steel, yet they deliver solid performance in dry environments and mechanical manufacturing scenarios. This guide breaks down their compositions, applications, and selection tips, covering everything from 0.05mm ultra-thin strips to 3.5mm medium-thick sheets.

Stainless Iron Strip/Sheet SUS410/420/430 Supply | 0.05–3.5mm Full Range(图1)

Core Parameter Comparison Table

Item	SUS410	SUS420	SUS430	Practical Tips
Thickness Range	0.05–3.5mm	0.05–3.5mm	0.05–3.5mm	Ultra-thin strips (0.05–0.5mm) for precision parts; medium-thick sheets (0.6–3.5mm) for mechanical load-bearing
Core Composition	Cr 11.5–13.5%, C ≤0.15%	Cr 12–14%, C 0.15–0.4%	Cr 16–18%, C ≤0.12%	Higher carbon content = higher hardness: 420 > 410 > 430
Magnetism	Strongly magnetic (firmly attracted to magnets)	Strongly magnetic	Strongly magnetic	Ideal for magnetic scenarios like electromagnetic components
Corrosion Resistance	Resists mild corrosion; rust-proof in dry environments	Slightly lower than 410; higher hardness	Best among the three; close to low-corrosion stainless steel	Not suitable for coastal or acid-base environments; only for dry indoor use
Mechanical Properties	Tensile strength ≥450MPa; mild bendable	Tensile strength ≥520MPa; hardness up to HRC50+ after quenching	Tensile strength ≥400MPa; better ductility than 410/420	420 for cutting tools; 430 for decorative parts; 410 balances strength and machinability
Surface Finishing	2B matte, pickled, brushed	2B matte, quenched & polished, brushed	2B matte, BA bright, brushed	420 polished for tool edges; 430 bright finish for decoration

Key Differences Between SUS410/420/430

All three belong to ferritic/martensitic stainless iron, with chromium as the core element. Minor differences in carbon and chromium content determine their distinct performance:

SUS410: Balances Strength & MachinabilityA martensitic stainless iron with 11.5–13.5% chromium and ≤0.15% carbon. It can be hardened via quenching while retaining good bending and stamping properties in the annealed state. 0.05mm thin strips are ideal for small springs and clips; 3.5mm thick sheets work for agricultural machinery parts.
SUS420: Hardness King for Tools & DiesHas the highest carbon content (0.15–0.4%) among the three, paired with 12–14% chromium. After quenching, its hardness exceeds HRC50, delivering sharp and wear-resistant edges. It’s commonly used for kitchen knives, scissors, and bearing races — 0.1mm thin strips can even be made into precision blades.
SUS430: Best Corrosion ResistanceA ferritic stainless iron with the highest chromium content (16–18%) and ≤0.12% carbon. Its corrosion resistance tops the three grades, and it can be finished with bright or brushed surfaces for a premium look. 3.5mm thick sheets are used for range hood casings and oven liners; 0.05mm thin strips make decorative trim for home appliances.

Application Scenarios by Thickness

Different thicknesses of SUS410/420/430 stainless iron strip/sheet cater to diverse needs, from precision electronics to mechanical manufacturing:

1. Ultra-Thin Strip (0.05–0.5mm)

SUS410: Iron cores for small electromagnetic relays, shrapnel for electronic components — strong magnetism + mild bendability ensure stable adsorption when energized.
SUS420: Razor blades, printer paper cutters — high hardness after quenching prevents edge rolling and ensures long service life.
SUS430: Refrigerator door trim, microwave liner patches — bright surface for aesthetics; rust-proof for 10+ years in dry environments.

2. Medium-Thin Strip (0.6–1.5mm)

SUS410: Auto exhaust brackets, motorcycle fenders — sufficient strength + lightweight design for structural parts.
SUS420: Tool bits for hardware, garden scissors — polished edges rival professional tool steel in sharpness.
SUS430: Oven liners, disinfection cabinet casings — heat-resistant and rust-proof; no deformation or rusting from high-temperature baking.

3. Medium-Thick Sheet (1.6–3.5mm)

SUS410: Agricultural plow blades, crusher hammers — wear-resistant and impact-resistant for outdoor dry environment operations.
SUS420: Mold inserts, bearing races — high hardness after quenching withstands high-frequency friction without wear.
SUS430: Security door frames, stair handrail bases — strong, easy to maintain, and perfect for indoor decoration.

Common Q&A

Q1: Are SUS410/420/430 stainless steel? Why are they called stainless iron?

A1: Strictly speaking, they are stainless iron, not stainless steel — the key difference is the absence of nickel. Nickel is critical for stainless steel’s corrosion resistance and austenitic structure. These grades are ferritic/martensitic, strongly magnetic, and 20–30% cheaper than 304 stainless steel.

Q2: Can these three stainless iron grades be used outdoors? Will they rust?

A2: Long-term outdoor use in humid conditions is not recommended! They are only suitable for dry environments. In rainy, high-humidity areas, rust spots will appear within 6 months. If outdoor use is unavoidable, painting or passivation is required, but their service life will still be much shorter than 304 stainless steel.

Q3: Which stainless iron grade is suitable for laser cutting? Is post-cutting treatment needed?

A3: All three can be laser cut. SUS430 has the best cutting performance, with smooth, rust-resistant edges. SUS420 requires annealing after cutting to avoid brittleness from high hardness. Passivation is recommended for all grades after cutting to enhance surface rust resistance.

Q4: How to distinguish between these three grades? I’m afraid of buying the wrong type.

A4: Two simple methods:

Hardness test: File the surface — SUS420 is the hardest (hard to file), SUS410 is medium, and SUS430 is the softest.
Check material reports: Verify chromium and carbon content — SUS430 has the highest chromium (16–18%), and SUS420 has the highest carbon (0.15–0.4%).

Q5: How do these three grades compare to 304 stainless steel in cost-effectiveness?

A5: Their biggest advantage is lower cost. For dry indoor scenarios that don’t require high corrosion resistance, they can significantly reduce procurement costs. For example, using SUS430 for range hood casings cuts costs by half compared to 304, with similar performance. However, 304 is still the better choice for food equipment or coastal applications.

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