Material number S43000: 430
S43000 is the Unified Numbering System designation for 430, ferritic chromium stainless steel specified in ASTM A240.
What S43000 means
UNS numbers (ASTM E527 / SAE J1086) use a letter for the alloy family and five digits: G = AISI/SAE carbon and alloy steels (G41400 = 4140), S = stainless and heat-resisting steels (S30400 = 304), K = miscellaneous steels (K02600 = A36), T = tool steels, N = nickel alloys. The UNS number identifies a composition, not a product form or property level, so S43000 appears in several ASTM specifications (plate, bar, pipe) with different mechanical requirements.
430 at a glance
Type 430 is the workhorse ferritic stainless steel: 16–18 % chromium, no nickel, body-centred cubic structure, therefore magnetic and — because it carries no nickel — 30–40 % cheaper than 304. UNS S43000, EN 1.4016. It offers good resistance to mild atmospheres, fresh water, food acids and nitric acid, a bright polished or brushed surface, and easier machining than the austenitics; in return it gives up formability, weld toughness, low-temperature toughness and chloride resistance.
The classic uses follow from that trade-off: appliance panels, dishwasher tubs, range hoods, sink surrounds, automotive trim, decorative tube and interior architecture — parts that are stamped or lightly drawn, seldom welded and never exposed to salt. Where welding is needed, the stabilized cousins 439 and 441 (EN 1.4510, 1.4509) avoid grain-boundary sensitization and grain growth in the HAZ.
Minimum properties are 205 MPa yield and 450 MPa tensile; typical 2B sheet is stronger (≈ 320/500 MPa) and has a lower work-hardening rate than 304, so press loads and spring-back are smaller. EN 1.4016, JIS SUS430, GB 10Cr17 and GOST 12Kh17 are the same grade.
Full data sheet for 430 → · Equivalent grades →