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Gangsteel, a leading Chinese exporter of high-quality cold-rolled stainless steel coils and sheets, presents a detailed comparison between 403 and 430 stainless steel coils.
Grade 403 (AISI 403 or UNS S40300) is a martensitic stainless steel offering higher strength and hardness through heat treatment, making it suitable for high-stress applications. Grade 430 (AISI 430 or UNS S43000) is a classic ferritic stainless steel prized for its affordability, magnetic properties, and good performance in mildly corrosive environments. Both are supplied in coil form for efficient slitting, forming, and stamping, with thicknesses typically 0.3–3.0 mm and widths up to 1500 mm. While they share chromium for passivation, 403’s martensitic structure allows hardening (up to 40 HRC), whereas 430 remains soft and ferritic. This guide covers chemical composition, mechanical properties, equivalents, corrosion resistance, weldability, applications, and more. As ferritic specialists, Gangsteel supplies premium 430 coils like our JIS G4305 SUS 430 stainless steel sheet (available in coil form) and a240 Type_430 stainless steel sheet.
Both grades are magnetic with excellent thermal conductivity (~25 W/m·K) and low expansion (~10.5–11.5 × 10⁻⁶/°C), but 403 excels in high-strength needs while 430 prioritizes cost and formability. Gangsteel’s coils undergo bright annealing and precise rolling for superior surface quality (2B, BA, No.4).
The alloying elements define their performance: 403 has lower chromium but higher carbon for hardenability; 430 has higher chromium for better passivation.
Based on ASTM A240:
|
Element |
403 |
430 |
|---|---|---|
|
Carbon (C) |
≤0.15 |
≤0.12 |
|
Chromium (Cr) |
11.5-13.0 |
16.0-18.0 |
|
Manganese (Mn) |
≤1.00 |
≤1.00 |
|
Silicon (Si) |
≤0.50 |
≤1.00 |
|
Phosphorus (P) |
≤0.040 |
≤0.040 |
|
Sulfur (S) |
≤0.030 |
≤0.030 |
|
Nickel (Ni) |
≤0.75 |
≤0.75 |
|
Iron (Fe) |
Balance |
Balance |
403’s lower Cr and higher allowable C enable heat treatment for strength. 430’s higher Cr provides superior general corrosion resistance. For European equivalents, our EN10088 2 X6Cr17 stainless steel sheet matches 430 in coil form.
Mechanical properties differ significantly: 403 can be hardened, while 430 is used annealed.
From ASTM A240 and typical values:
|
Property |
403 (annealed) |
430 (annealed) |
|---|---|---|
|
Yield Strength (0.2% offset) |
≥310 MPa |
≥205 MPa |
|
Tensile Strength |
≥485 MPa |
≥450 MPa |
|
Elongation (in 50 mm) |
≥20% |
≥22% |
|
Hardness (Rockwell B) |
≤95 HRB |
≤89 HRB |
|
Density |
7.75 g/cm³ |
7.70 g/cm³ |
403 in hardened condition reaches 1200 MPa tensile and 40 HRC, ideal for wear-resistant coils. 430 remains softer for easier forming. Gangsteel’s DIN 1.4016 stainless steel sheet ensures consistent 430 coil properties.
Both have global cross-references for coil sourcing.
|
Standard/Region |
403 Equivalent |
430 Equivalent |
|---|---|---|
|
AISI/UNS (USA) |
403 / S40300 |
430 / S43000 |
|
EN/DIN (Europe) |
1.4006 / X12Cr13 |
1.4016 / X6Cr17 |
|
JIS (Japan) |
SUS403 |
SUS430 |
|
GB (China) |
1Cr12 / 12Cr12 |
1Cr17 / 10Cr17 |
|
BS (UK) |
420S29 (similar) |
430S17 |
Our GB/T 10Cr17 1Cr17 stainless steel sheet is a direct Chinese equivalent for 430 coils.
Corrosion resistance favors 430 in mild atmospheres; 403 offers moderate protection with heat-treatment benefits.
430 resists atmospheric corrosion, fresh water, and mild acids well but pits in chlorides.
403 provides fair resistance (similar to 410) in mild environments and steam, with better scaling resistance up to 650°C. Neither suits heavy chlorides (use 316).
For oxidizing or decorative coils: 430; high-temp/strength: 403.
Weldability: 403 requires preheating (200–300°C) and post-weld annealing to avoid cracking; 430 needs annealing for sensitization.
Fabrication: 430 is more formable for deep drawing; 403 suits machining after hardening. Both magnetic and polishable (BA finish common in coils).
For welded structural coils: 403 (with care); decorative: 430 like our JIS G4305 SUS 430 stainless steel sheet.
430 for cost-effective, decorative coils.
403 for high-stress, heat-resistant coils.
430 cheaper (1200-1400 USD/MT) and widely available. 403 similar or slightly higher (1300-1500 USD/MT) due to martensitic processing. Gangsteel’s coils ensure competitive 430 pricing like DIN 1.4016 stainless steel sheet.
403 for heat-treatable strength in high-stress/temperature; 430 for economy and formability in mild conditions. Consider hardness needs, environment, and budget.
403 martensitic (hardenable, higher strength); 430 ferritic (softer, cheaper).
430 in mild atmospheres; 403 in steam/high-temp.
403 requires heat treatment; 430 simpler annealing.
Excel in 430 coils like a240 Type_430 stainless steel sheet; inquire for 403.
In summary, 403 delivers strength for demanding coils, 430 value for general use—Gangsteel supports your selection with quality coils.
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