Austenitic, ferritic, martensitic and precipitation-hardening stainless steels for corrosion resistance, heat resistance and fabrication — supplied in pipes, tubes, fittings, flanges, sheets, plates, coils, bars, fasteners and structural sections.
Stainless steel is the workhorse of process industry construction: a family of iron-chromium alloys whose chromium content (from about 10.5% upward) forms a self-healing passive oxide film that gives the material its corrosion resistance. Nickel, molybdenum, titanium, niobium and nitrogen tailor each grade for specific duties — general corrosion, chloride pitting, high temperature oxidation or strength.
ACERO ALLOYS supplies stainless steel across the four main families. The austenitic 300-series (304, 316, 317, 321, 347, 309, 310S, 904L) covers the majority of chemical, food, pharmaceutical and marine applications, with 254 SMO and Alloy 20 extending the range into high-chloride and acid service. Duplex grades combine austenite and ferrite for higher strength and chloride resistance (see the Duplex & Super Duplex page). Ferritic and martensitic grades (409, 416, 430, 430F, 431, 440C, 410, 420, 446) serve where moderate corrosion resistance is needed with lower cost or higher hardness, and 17-4 PH and 15-5 PH add a precipitation-hardening option for high-strength components.
Material is supplied against ASTM/ASME and EN specifications with the applicable mill test certification and heat-number traceability.
The grades below are the ones most often asked for. Each grade stays on this page — the material-first way to browse.
UNS S30400 / S30403 / S30409 EN / W.Nr. 1.4301 / 1.4307 / 1.4948
The general-purpose 18/8 austenitic grade. Excellent formability and weldability; 304L with controlled carbon resists sensitisation in welded constructions, and 304H with controlled carbon serves elevated-temperature pressure parts.
UNS S31600 / S31603 / S31609 EN / W.Nr. 1.4401 / 1.4404 / 1.4919
The molybdenum-bearing austenitic grade with improved pitting and crevice corrosion resistance in chloride environments — the default choice for chemical, marine and coastal service. 316L resists sensitisation in welded construction; 316H carries controlled carbon for elevated-temperature creep service.
UNS S31635 EN / W.Nr. 1.4571
Titanium-stabilised 316 for resistance to intergranular corrosion after welding in elevated-temperature service. The European-preferred equivalent of 321 chemistry in a 316 base.
UNS S31700 / S31703 EN / W.Nr. 1.4449 / 1.4438
Molybdenum-enhanced austenitic grade with higher nickel than 316 — roughly 3–4% Mo for improved resistance to pitting, crevice corrosion and general corrosion in chloride and sulphur-bearing process streams. 317L adds low-carbon weldability for chemical and pulp-and-paper plant.
UNS S32100 / S32109 EN / W.Nr. 1.4541 / 1.4878
Titanium-stabilised austenitic grade for welded constructions in the 425–900 °C range — aircraft exhausts, furnace parts, pressure-vessel applications where sensitisation must be avoided.
UNS S34700 / S34709 EN / W.Nr. 1.4550 / 1.4961
Niobium-stabilised grade with better high-temperature strength than 321, used in welded pressure parts and high-temperature chemical service.
UNS S31000 / S31008 EN / W.Nr. 1.4841 / 1.4845
High-chromium high-nickel grade for furnace parts, heat-treatment fixtures and combustion equipment, with good oxidation resistance up to about 1100 °C.
UNS S30900 / S30908 EN / W.Nr. 1.4828 / 1.4833
High-chromium austenitic grade for elevated-temperature service up to about 1000 °C — furnace and boiler internals, heat-exchanger tubes and refractory anchors. 309S (low carbon) is preferred for welded fabricated parts.
UNS N08904 EN / W.Nr. 1.4539
High-alloy austenitic grade with copper, for severe sulphuric and phosphoric acid duty and chloride-rich scrubber environments — an economical alternative to nickel alloys in many acid plants.
UNS S31254 EN / W.Nr. 1.4547
Super-austenitic 6-molybdenum grade with nitrogen and copper — very high resistance to pitting and crevice corrosion in seawater, brine and bleach environments. Used for heat-exchanger tubing, desalination, flue-gas scrubbers and pulp mill equipment where 316L fails.
UNS N08020 EN / W.Nr. 2.4660
Niobium-stabilised austenitic nickel–iron–chromium alloy with copper and molybdenum — the classic sulphuric and phosphoric acid plant material, also strong in nitric/hydrochloric mixtures. Pumps, valves, heat exchangers and piping in chemical fertiliser duty.
UNS S40900 EN / W.Nr. 1.4512
Titanium-stabilised 11% chromium ferritic grade — the automotive exhaust and wagon-building workhorse. Good resistance to exhaust-gas condensate and mild atmospheres at low cost. 409L is the low-carbon weldable variant; 409M is the higher-strength modification used in railway wagons and structural fabrications.
UNS S41000 EN / W.Nr. 1.4006
Martensitic 12% chromium grade — hardenable by heat treatment, used for valve and pump parts, fasteners and cutlery where moderate corrosion resistance and strength are needed.
UNS S42000 EN / W.Nr. 1.4021
Higher-carbon martensitic grade that hardens to high hardness — knife blades, surgical instruments, valve seats and wear parts.
UNS S43000 EN / W.Nr. 1.4016
Straight-chromium ferritic grade — good corrosion resistance in indoor and mildly corrosive atmospheres, excellent polishability, used for appliance trims, automotive trim and decorative work.
UNS S43020 EN / W.Nr. 1.4104
Free-machining version of 430 with sulphur added for excellent chip-breaking — the standard ferritic grade for automatically machined parts: solenoid cores, shafts, fittings and sensor housings on lathes and screw machines.
UNS S43100 EN / W.Nr. 1.4057
Martensitic 16% chromium grade with nickel — the best corrosion resistance of the hardenable straight-chromium grades. Shafts, bolts and nuts, valve parts and pump components needing strength plus better corrosion resistance than 410/420.
UNS S41600 EN / W.Nr. 1.4005
Free-machining martensitic grade — 410 chemistry with sulphur for the highest machining speeds of any stainless. Screws, nuts, bolts and precision turned parts where corrosion demands are moderate.
UNS S44004 EN / W.Nr. 1.4125
The highest-hardness martensitic stainless — heat-treats to about 58 HRC with 17% chromium, giving the best wear plus corrosion combination of the 400-series. Balls and races, valve trims, knife edges and medical instruments.
UNS S44600 EN / W.Nr. 1.4762
High-chromium (23 – 27% Cr) ferritic grade for elevated-temperature oxidation resistance — boiler baffles, recuperator and furnace parts, glass-mould and kiln furniture service. Superior to 309/310 in sulphur-bearing combustion atmospheres, though harder to weld.
UNS S17400 EN / W.Nr. 1.4542
Precipitation-hardening martensitic grade combining stainless corrosion resistance with high strength in the aged condition — valve internals, pump shafts, aerospace and nuclear components.
UNS S15500 EN / W.Nr. 1.4545
Precipitation-hardening martensitic grade closely related to 17-4 PH but with lower delta-ferrite, giving better transverse toughness and forgeability — larger valve and pump bodies, shafts, gears and aircraft structural fittings requiring high strength with corrosion resistance.
Nominal ranges as published in the common product standards. Values are indicative and for comparison only — always purchase against the current ASTM/EN specification and the mill test certificate.
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 (304L: ≤ 0.030) |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 (304L: 8.0 – 12.0) |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulphur (S) | ≤ 0.030 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 (316L: ≤ 0.030) |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulphur (S) | ≤ 0.030 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Titanium (Ti) | 5×C – 0.70 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 (317L: ≤ 0.030) |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 11.0 – 15.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | 5×C – 0.70 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium + Tantalum | 10×C – 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.50 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.20 (309S: ≤ 0.08) |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.02 |
| Chromium (Cr) | 19.0 – 23.0 |
| Nickel (Ni) | 23.0 – 28.0 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Copper (Cu) | 1.0 – 2.0 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Chromium (Cr) | 19.5 – 20.5 |
| Nickel (Ni) | 17.5 – 18.5 |
| Molybdenum (Mo) | 6.0 – 6.5 |
| Nitrogen (N) | 0.18 – 0.22 |
| Copper (Cu) | 0.50 – 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Chromium (Cr) | 19.0 – 21.0 |
| Nickel (Ni) | 32.0 – 38.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Copper (Cu) | 3.0 – 4.0 |
| Niobium + Tantalum | 8×C – 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.08 (409L: ≤ 0.030) |
| Chromium (Cr) | 10.5 – 11.75 |
| Titanium (Ti) | 6×C – 0.75 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Chromium (Cr) | 11.5 – 13.5 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | 0.30 – 0.40 |
| Chromium (Cr) | 12.0 – 14.0 |
| Manganese (Mn) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Chromium (Cr) | 16.0 – 18.0 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Chromium (Cr) | 16.0 – 18.0 |
| Sulphur (S) | ≥ 0.15 |
| Manganese (Mn) | ≤ 1.25 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Chromium (Cr) | 15.0 – 17.0 |
| Nickel (Ni) | 1.25 – 2.50 |
| Manganese (Mn) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.15 |
| Chromium (Cr) | 12.0 – 14.0 |
| Sulphur (S) | ≥ 0.15 |
| Manganese (Mn) | ≤ 1.25 |
| Element | Content |
|---|---|
| Carbon (C) | 0.95 – 1.20 |
| Chromium (Cr) | 16.0 – 18.0 |
| Molybdenum (Mo) | ≤ 0.75 |
| Manganese (Mn) | ≤ 1.00 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Chromium (Cr) | 23.0 – 27.0 |
| Nickel (Ni) | ≤ 0.75 |
| Manganese (Mn) | ≤ 1.50 |
| Silicon (Si) | ≤ 0.75 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Chromium (Cr) | 15.0 – 17.5 |
| Nickel (Ni) | 3.0 – 5.0 |
| Copper (Cu) | 3.0 – 5.0 |
| Niobium + Tantalum | 0.15 – 0.45 |
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Chromium (Cr) | 14.0 – 15.5 |
| Nickel (Ni) | 3.5 – 5.5 |
| Copper (Cu) | 2.5 – 4.5 |
| Niobium + Tantalum | 0.15 – 0.45 |
Typical minimum values for the common product forms in the annealed / solution-treated condition. Actual properties depend on product form, specification revision and heat treatment.
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 40 % |
| Typical density | 8.0 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 40 % |
| Typical density | 8.0 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 40 % |
| Typical density | 8.0 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 40 % |
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 40 % |
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 40 % |
| Property | Value |
|---|---|
| Tensile strength (min) | 490 MPa |
| Yield strength (min) | 220 MPa |
| Elongation (min) | 35 % |
| Property | Value |
|---|---|
| Tensile strength (min) | 655 MPa |
| Yield strength (min) | 300 MPa |
| Elongation (min) | 35 % |
| Typical density | 8.0 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 550 MPa |
| Yield strength (min) | 240 MPa |
| Elongation (min) | 30 % |
| Typical density | 8.08 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 380 MPa |
| Yield strength (min) | 170 MPa |
| Elongation (min) | 20 % |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 485 MPa |
| Yield strength (min, annealed) | 205 MPa |
| Elongation (min) | 20 % |
| Typical density | 7.74 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (hardened, typical) | ≥ 655 MPa |
| Hardness (hardened, typical) | ≥ 50 HRC (indicative) |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 450 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 22 % |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 450 MPa |
| Yield strength (min) | 205 MPa |
| Elongation (min) | 22 % |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 690 MPa |
| Yield strength (min, annealed) | 410 MPa |
| Elongation (min) | 15 % |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 485 MPa |
| Yield strength (min, annealed) | 275 MPa |
| Elongation (min) | 20 % |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Hardness (hardened, typical) | ≈ 58 HRC (indicative) |
| Tensile strength (hardened, typical) | ≥ 1900 MPa (indicative) |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa |
| Yield strength (min) | 275 MPa |
| Elongation (min) | 20 % |
| Typical density | 7.7 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (H900 aged, min) | 1310 MPa |
| Yield strength (H900 aged, min) | 1170 MPa |
| Elongation (H900 aged, min) | 10 % |
| Typical density | 7.8 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (H900 aged, min) | 1310 MPa |
| Yield strength (H900 aged, min) | 1170 MPa |
| Elongation (H900 aged, min) | 10 % |
| Typical density | 7.8 g/cm³ |
| Property | Value |
|---|---|
| Density (austenitic grades) | ≈ 8.0 g/cm³ (8000 kg/m³) |
| Density (ferritic / martensitic) | ≈ 7.7 – 7.75 g/cm³ |
| Melting range (304/316) | ≈ 1400 – 1450 °C |
| Thermal conductivity (304, 100 °C) | ≈ 16 W/m·K |
| Specific heat (304) | ≈ 500 J/kg·K |
Stainless Steel is offered in the product forms below. Availability varies by grade and size — confirm the exact combination with our sales desk.
Seamless and welded pipes and tubes to ASTM/ASME, IS and BS specifications — including boiler, air-preheater and corten tubes.
Hot-rolled and cold-rolled sheets, plates, coils, circles and flats in standard and cut sizes.
Butt-weld, forged and socket-weld fittings — elbows, tees, reducers, caps, stub ends, olets and nipples.
Weld neck, slip-on, blind, lap joint, socket weld, threaded, spectacle, ring joint, orifice and deck flanges to ASME B16.5, 150# – 2500#.
Bright and black round bars, square and hex bars, flats and wires in stainless, duplex, alloy, carbon and nickel-alloy grades.
Bolts, nuts, studs, washers and threaded rods in alloy and stainless grades.
Angles, channels, beams, flats and other structural sections.
| Standard | Scope |
|---|---|
| ASTM A312 / ASME SA312 | Seamless and welded austenitic pipes |
| ASTM A213 / ASME SA213 | Seamless ferritic and austenitic boiler, superheater and heat-exchanger tubes |
| ASTM A240 / ASME SA240 | Chromium and chromium-nickel plate, sheet and strip for pressure vessels |
| ASTM A182 / ASME SA182 | Forged or rolled alloy-steel pipe flanges, fittings and valves |
| ASTM A276 | Stainless steel bars and shapes |
| ASTM A193 B8 / B8M | Bolting for high-temperature service |
| ASME B16.5 | Pipe flanges and flanged fittings (NPS ½ – 24) |
| EN 10088 | Stainless steels (European grades) |
Stainless steel is supplied against the applicable ASTM/ASME or EN specification with EN 10204 Type 3.1 mill test certification and heat-number traceability. Intergranular-corrosion testing (ASTM A262), ferrite checks, PMI, and third-party inspection can be arranged — state the documentation package when requesting a quote.
Both are austenitic 18-chromium stainless steels, but 316 adds 2–3% molybdenum, which substantially improves resistance to pitting and crevice corrosion in chloride environments such as seawater, brines and coastal atmospheres. 304 is the lower-cost choice for general indoor and mild-service applications.
The "L" (low-carbon) variants hold carbon to 0.030% max, which prevents chromium-carbide precipitation during welding and the intergranular corrosion that follows. Use the L grades wherever the welded fabrication cannot be solution-annealed after welding.
No. Product-form availability depends on the grade and size — for example, 904L is common in pipes, sheets and fittings but not in structural sections. Confirm your exact grade, form, size and quantity with our sales desk.
Our weight calculators use 8.0 g/cm³ (8000 kg/m³) for austenitic grades and about 7.7 g/cm³ for ferritic and martensitic grades. Results are theoretical estimates for budgeting and freight planning.
Yes. Third-party inspection (TPI) by agencies such as SGS, BV, TÜV or Lloyd's can be arranged at the buyer's account. Mention the inspection requirement with the enquiry so it is included in the offer.
Yes. We regularly handle export documentation and packing for buyers in the UAE, Saudi Arabia, Oman, Qatar, Kuwait and Bahrain, including Gulf-region country-of-origin and conformity requirements — confirm destination-specific needs with the sales desk.
Send the grade, product form, size and quantity — our sales desk replies with an offer and lead time within one business day.
Material, grade, product form and quantity — our sales desk replies within one business day.