Stainless Steel
Corrosion-resistant, most versatile. 17 grades with composition, properties and applications.
201
A cost-reduced austenitic stainless where manganese and nitrogen replace much of the nickel — higher yield strength than 304 at lower cost, for indoor and decorative use.
304
The world's most widely used stainless steel — the 18/8 austenitic all-rounder balancing corrosion resistance, formability and hygiene.
304L
The low-carbon version of 304 — ≤0.030% carbon suppresses weld sensitisation, preventing intergranular corrosion in as-welded fabrications.
304H
The high-carbon variant of 304 — controlled carbon (0.04–0.10%) and coarser grain give superior creep strength for sustained high-temperature pressure service.
316
The molybdenum-bearing austenitic grade built to resist chlorides — the marine, brine and chemical workhorse.
316L
Low-carbon 316 — combines ≤0.030% carbon (no weld sensitisation) with 2–3% molybdenum (chloride pitting resistance); the standard for welded marine and surgical use.
321
Titanium-stabilised austenitic stainless — titanium ties up carbon before chromium carbides can form, the preferred grade for welded service in the 425–850 °C range.
310S
A 25Cr–20Ni heat-resistant austenitic stainless — its high chromium and nickel sustain a protective oxide scale for continuous service up to ~1100 °C.
430
A nickel-free ferritic stainless — magnetic, economical, and immune to chloride stress-corrosion cracking.
409
The most economical ferritic stainless — titanium-stabilised 11% chromium built for welded automotive exhaust systems.
444
A molybdenum-bearing dual-stabilised ferritic stainless — pitting resistance rivalling 316 with better chloride SCC resistance and no nickel.
410
The basic hardenable martensitic stainless — quench-and-temper for strength and wear where moderate corrosion resistance suffices.
420
A cutlery-grade martensitic stainless — higher carbon than 410 takes a fine hardened edge and a mirror polish.
30Cr13
A Chinese GB martensitic stainless (≈0.30% C) — the AISI 420 / EN 1.4028 counterpart, hardenable for blades, instruments and wear parts.
40Cr13
The highest-carbon (≈0.40% C) grade of the GB Cr13 martensitic family — EN 1.4031 / X39Cr13, hardens harder than 30Cr13 for cutlery, moulds and measuring tools.
95Cr18
A high-carbon (≈0.95% C), 18% Cr martensitic stainless — also a GB stainless bearing steel (GB/T 3086), hardening to ≥55 HRC for bearings, knives and wear parts.
440C
The highest-carbon martensitic stainless — hardens to ~58–60 HRC for the best wear resistance among stainless steels.
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