# Schierle Siyaya GmbH > Schierle Siyaya GmbH is a Neuss, Germany–based supplier of seamless stainless > steel tubes, hydraulic line tubing and instrumentation tubes, also offering > contract processing and technical consulting. Founded by Eduard Schierle in > 1955 and re-established as Schierle Siyaya GmbH in 2025. "Siyaya" is Zulu for > "we move forward." ## Company facts - Legal name: Schierle Siyaya GmbH - Address: Rampenstraße 2, 41472 Neuss, Germany - Email: info@schierle-siyaya.com - Phone: +49 2131 7768 468 - Commercial register: HRB 24631, Amtsgericht Neuss - VAT ID: DE456397521 - Heritage: family steel-trade business since 1955; GmbH established 2025 - Area served: Germany, Europe, worldwide - Languages: German, English ## Products and services - Seamless stainless steel tubes — a wide range for every industry, from repair quantities to factory-run volumes. - Hydraulic line tubing — bright-annealed, cold-finished tubing for high-pressure hydraulic systems, to European and American specifications. - Instrumentation tubes — tight-tolerance tubing for instrumentation, control and precision fluid applications. - Processing — send a drawing, receive finished components to spec; any material, any complexity, one point of contact. - Consulting — technical and commercial consulting for industrial supply challenges. ## Key pages - [Home (DE)](https://schierle-siyaya.com/de): Company overview and entry point. - [Home (EN)](https://schierle-siyaya.com/en): English company overview. - [Products](https://schierle-siyaya.com/en/products): Stainless steel tubes, hydraulic and instrumentation tubing with specifications. - [Processing](https://schierle-siyaya.com/en/processing): Drawing-to-component contract processing service. - [Consulting](https://schierle-siyaya.com/en/consulting): Technical and commercial consulting services. - [Product catalogue](https://schierle-siyaya.com/en/product-catalogue): Searchable product range and quote requests. - [Material grades](https://schierle-siyaya.com/en/materials): Reference database of 53 stainless and nickel-alloy grades — composition, mechanical properties and standard equivalences. - [Company](https://schierle-siyaya.com/en/company): History from 1955 to today, mission and values. - [Quality](https://schierle-siyaya.com/en/quality): ISO 9001:2015 quality process and principles. - [Contact](https://schierle-siyaya.com/en/contact): Contact details and enquiry form. ## Material grades > Reference data for 53 stainless steel and nickel-alloy grades: chemical composition, > mechanical properties and standard equivalences (DIN/EN, AISI, UNS, SS, AFNOR, BS, PN). > Indicative values traceable to DIN/EN standards — verify against the applicable > standard before specifying. - [1.4016 TP 430 (X6Cr17)](https://schierle-siyaya.com/en/materials/1-4016): Ferritic stainless — Standard ferritic grade — magnetic, with moderate corrosion resistance, used where an austenitic grade is not required. - [1.4301 TP 304 (X5CrNi18-10)](https://schierle-siyaya.com/en/materials/1-4301): Austenitic stainless — The classic 18/10 chromium-nickel austenitic and the most widely used stainless steel — good general corrosion resistance, excellent formability and weldability, non-magnetic in the solution-annealed condition. - [1.4306 TP 304L (X2CrNi19-11)](https://schierle-siyaya.com/en/materials/1-4306): Austenitic stainless — Extra-low-carbon 304 with slightly higher chromium and nickel than 1.4307; weld-stable against intergranular corrosion. - [1.4307 TP 304L (X2CrNi18-9)](https://schierle-siyaya.com/en/materials/1-4307): Austenitic stainless — Low-carbon variant of 304 and the general-purpose austenitic for most applications — good corrosion resistance, easy forming and welding, with low carbon securing resistance to intergranular corrosion as delivered. - [1.4361 Alloy 18-15 (X1CrNiSi18-15-4)](https://schierle-siyaya.com/en/materials/1-4361): Austenitic stainless — High-silicon austenitic developed for highly concentrated nitric acid (above 95%) and concentrated sulphuric acid (from 98.5%). - [1.4362 Duplex 2304 (X2CrNiN23-4)](https://schierle-siyaya.com/en/materials/1-4362): Duplex (austenitic-ferritic) — Lean duplex (2304) with a balanced austenite/ferrite structure — roughly double the proof strength of 316L with good stress-corrosion-cracking resistance, used wherever 1.4404 is used. - [1.4401 TP 316 (X5CrNiMo17-12-2)](https://schierle-siyaya.com/en/materials/1-4401): Austenitic stainless — Molybdenum-bearing austenitic with markedly better resistance to chlorides and non-oxidising acids than 304. - [1.4404 TP 316L (X2CrNiMo17-12-2)](https://schierle-siyaya.com/en/materials/1-4404): Austenitic stainless — Low-carbon 316. The molybdenum content handles chlorides while low carbon secures resistance to intergranular corrosion in the welded condition. - [1.4436 TP 316 (X3CrNiMo17-13-3)](https://schierle-siyaya.com/en/materials/1-4436): Austenitic stainless — 316 variant with higher molybdenum (2.5–3.0%) for improved pitting resistance; corrosion-resistant as delivered. - [1.4438 TP 317L (X2CrNiMo18-15-4)](https://schierle-siyaya.com/en/materials/1-4438): Austenitic stainless — 317L — higher molybdenum and nickel than 316L for stronger resistance to chlorides and acids; weld-stable. - [1.4439 317 LMN (X2CrNiMoN17-13-5)](https://schierle-siyaya.com/en/materials/1-4439): Austenitic stainless — Nitrogen-alloyed high-molybdenum austenitic (317LMN) with elevated strength and excellent resistance to chlorides and mixed acids. - [1.4501 Super Duplex (F55) (X2CrNiMoCuWN25-7-4)](https://schierle-siyaya.com/en/materials/1-4501): Duplex (austenitic-ferritic) — Tungsten-bearing super-duplex with high strength and excellent resistance to pitting and chloride stress-corrosion cracking. - [1.4507 Super Duplex 255 (X2CrNiMoCuN25-6-3)](https://schierle-siyaya.com/en/materials/1-4507): Duplex (austenitic-ferritic) — Copper-bearing super-duplex (255) combining high strength with strong resistance to pitting and stress-corrosion cracking in chloride and acid service. - [1.4516 (X2CrNiTi12)](https://schierle-siyaya.com/en/materials/1-4516): Ferritic stainless — Low-chromium, titanium-stabilised utility ferritic for less demanding corrosion duty. - [1.4529 Alloy 926 (X1NiCrMoCuN25-20-7)](https://schierle-siyaya.com/en/materials/1-4529): Austenitic stainless — 6%-molybdenum super-austenitic with very high resistance to pitting and crevice corrosion in chloride media. - [1.4539 Alloy 904L (X1CrNiMoCu25-20-5)](https://schierle-siyaya.com/en/materials/1-4539): Austenitic stainless — High-alloy super-austenitic with elevated nickel, molybdenum and copper for resistance to sulphuric and phosphoric acid and seawater; low carbon secures weld corrosion resistance. - [1.4541 TP 321 (X6CrNiTi18-10)](https://schierle-siyaya.com/en/materials/1-4541): Austenitic stainless — Titanium-stabilised austenitic. The titanium locks up carbon so intergranular corrosion is controlled even after welding, and adds elevated-temperature strength. - [1.4550 TP 347 (X6CrNiNb18-10)](https://schierle-siyaya.com/en/materials/1-4550): Austenitic stainless — Niobium-stabilised austenitic (347). The niobium addition secures resistance to intergranular corrosion in the welded condition. - [1.4563 Alloy 28 (X1NiCrMoCu31-27-4)](https://schierle-siyaya.com/en/materials/1-4563): Austenitic stainless — High-nickel/chromium/copper super-austenitic resistant to sulphuric acid and insensitive to stress-corrosion cracking; low carbon secures weld resistance. - [1.4571 TP 316Ti (X6CrNiMoTi17-12-2)](https://schierle-siyaya.com/en/materials/1-4571): Austenitic stainless — Titanium-stabilised 316. Combines the chloride resistance of 316 with stabilisation against intergranular corrosion in the welded state. - [1.4713 (X10CrAl7)](https://schierle-siyaya.com/en/materials/1-4713): Ferritic heat-resistant — Aluminium-alloyed ferritic heat-resistant steel, particularly resistant to sulphur-bearing gases at elevated temperature under reducing conditions. - [1.4720 TP 409 (X7CrTi12)](https://schierle-siyaya.com/en/materials/1-4720): Ferritic heat-resistant — Titanium-stabilised ferritic heat-resistant steel, used mainly in automotive exhaust and heat-recovery components. - [1.4724 TP 405 (X10CrAlSi13)](https://schierle-siyaya.com/en/materials/1-4724): Ferritic heat-resistant — Aluminium-silicon ferritic heat-resistant steel resistant to sulphur-bearing gases, including pickling-plant duty. - [1.4742 TP 430 (X10CrAlSi18)](https://schierle-siyaya.com/en/materials/1-4742): Ferritic heat-resistant — Aluminium-silicon ferritic heat-resistant steel with good resistance to sulphur-bearing gases to about 1000 °C. - [1.4749 TP 446 (X18CrN28)](https://schierle-siyaya.com/en/materials/1-4749): Ferritic heat-resistant — High-chromium nitrogen-bearing ferritic heat-resistant steel for sulphur-bearing gases at high temperature. - [1.4761 (X8CrTi25 mod.)](https://schierle-siyaya.com/en/materials/1-4761): Ferritic heat-resistant — High-chromium titanium-stabilised, nickel-free ferritic heat-resistant steel with good resistance to sulphurous atmospheres. Continuous use in the 400–700 °C range is not recommended. - [1.4762 TP 446 (X10CrAlSi25)](https://schierle-siyaya.com/en/materials/1-4762): Ferritic heat-resistant — High-chromium aluminium-silicon ferritic heat-resistant steel, especially resistant to sulphur-bearing gases under reducing conditions, to about 1150 °C. - [1.4821 TP 327 (X15CrNiSi25-4)](https://schierle-siyaya.com/en/materials/1-4821): Ferritic-austenitic heat-resistant — Ferritic-austenitic heat-resistant steel with better resistance to oxidising and especially reducing sulphur-bearing gases than the austenitic Cr-Ni heat-resistant grades. - [1.4835 253 MA (X9CrNiSiNCe21-11-2)](https://schierle-siyaya.com/en/materials/1-4835): Austenitic heat-resistant — High-temperature austenitic with nitrogen and rare-earth additions for raised strength, oxidation and corrosion resistance at 850–1100 °C. - [1.4841 TP 314 (X15CrNiSi25-21)](https://schierle-siyaya.com/en/materials/1-4841): Austenitic heat-resistant — Heat-resistant austenitic Cr-Ni steel with good scaling resistance and high hot strength, for duty needing both oxidation resistance and mechanical load capacity. - [1.4845 TP 310S (X8CrNi25-21)](https://schierle-siyaya.com/en/materials/1-4845): Austenitic heat-resistant — Heat-resistant austenitic Cr-Ni grade with good scaling resistance and high hot strength. - [1.4864 TP 330 (Alloy DS) (X12NiCrSi36-16)](https://schierle-siyaya.com/en/materials/1-4864): Austenitic heat-resistant — High-nickel silicon-bearing austenitic (Alloy DS) with very high hot strength and good resistance to oxidation and carburisation in alternating atmospheres. - [1.4876 Alloy 800 (X10NiCrAlTi32-20)](https://schierle-siyaya.com/en/materials/1-4876): Austenitic heat-resistant — High-temperature iron-nickel-chromium alloy (Alloy 800) for high-temperature plant, with good creep strength and oxidation resistance. - [1.4877 TP 32/27 (AC 66) (X5NiCrCeNb32-28)](https://schierle-siyaya.com/en/materials/1-4877): Austenitic heat-resistant — High-chromium cerium-bearing austenitic (AC 66) with outstanding high-temperature corrosion resistance; low Si and Al limit internal oxidation, strong in carburising and sulphur-bearing atmospheres. - [1.4878 TP 321H (X8CrNiTi18-10)](https://schierle-siyaya.com/en/materials/1-4878): Austenitic heat-resistant — Titanium-stabilised austenitic for elevated temperature (321H) with good scaling resistance and hot strength. - [1.4893 253 MA (X9CrNiSiNCe21-11-2)](https://schierle-siyaya.com/en/materials/1-4893): Austenitic heat-resistant — High-temperature austenitic (253 MA family) with nitrogen and rare earths for strength and oxidation resistance at 850–1100 °C; casting/forging variant of 1.4835. - [1.4919 TP 316H (X6CrNiMo17-13)](https://schierle-siyaya.com/en/materials/1-4919): Austenitic heat-resistant — Controlled-carbon 316 for elevated-temperature service (316H) with improved creep strength for pressure parts. - [1.4948 TP 304H (X6CrNi18-11)](https://schierle-siyaya.com/en/materials/1-4948): Austenitic heat-resistant — Controlled-carbon 304 for elevated-temperature service (304H) with improved creep strength for pressure parts. - [1.4958 Alloy 800H (X5NiCrAlTi31-20)](https://schierle-siyaya.com/en/materials/1-4958): Austenitic heat-resistant — Controlled-chemistry, high-temperature grade of Alloy 800 (800H) with enhanced creep-rupture strength for high-temperature plant. - [2.4066 Alloy 200 (Ni 99.2)](https://schierle-siyaya.com/en/materials/2-4066): Nickel-based alloys — Commercially pure nickel with excellent resistance to alkaline media and good mechanical properties over a wide temperature range; resistant under reducing conditions (e.g. hydrochloric, hydrofluoric acid). - [2.4068 Alloy 201 (LC-Ni 99)](https://schierle-siyaya.com/en/materials/2-4068): Nickel-based alloys — Low-carbon commercially pure nickel, used mainly in the chemical industry, especially for caustic soda, chlorine and hydrogen chloride. - [2.4360 Alloy 400 (NiCu30Fe)](https://schierle-siyaya.com/en/materials/2-4360): Nickel-based alloys — Nickel-copper alloy (Monel-type) with broad chemical resistance, notably seawater-resistant and good under reducing conditions. - [2.4600 Alloy B3 (NiMo29Cr)](https://schierle-siyaya.com/en/materials/2-4600): Nickel-based alloys — Nickel-molybdenum alloy with very high resistance to reducing media such as hydrochloric and sulphuric acid over wide concentration and temperature ranges, and good resistance to intergranular corrosion. - [2.4602 Alloy C-22 (NiCr21Mo14W)](https://schierle-siyaya.com/en/materials/2-4602): Nickel-based alloys — Nickel-chromium-molybdenum-tungsten alloy with excellent resistance to oxidising, reducing and mixed acids. - [2.4610 Alloy C-4 (NiMo16Cr16Ti)](https://schierle-siyaya.com/en/materials/2-4610): Nickel-based alloys — Nickel-molybdenum-chromium alloy with excellent resistance to crevice corrosion, pitting and stress-corrosion cracking, and to reducing mineral acids and chloride-contaminated media. - [2.4619 Alloy G-3 (NiCr22Mo7Cu)](https://schierle-siyaya.com/en/materials/2-4619): Nickel-based alloys — Corrosion-resistant, high-temperature nickel alloy with good weldability and resistance to grain-boundary corrosion in the welded state. - [2.4633 Alloy 602 CA (NiCr25FeAlY)](https://schierle-siyaya.com/en/materials/2-4633): Nickel-based alloys — High-temperature, chemically resistant nickel-chromium alloy for the most demanding oxidising and reducing service, including resistance to moist chlorine gas. - [2.4660 Alloy 20 (NiCr20CuMo)](https://schierle-siyaya.com/en/materials/2-4660): Nickel-based alloys — Highly corrosion-resistant alloy, very resistant in chloride-bearing media to sulphuric, phosphoric and nitric acid. - [2.4816 Alloy 600 (NiCr15Fe)](https://schierle-siyaya.com/en/materials/2-4816): Nickel-based alloys — Non-age-hardening nickel-chromium alloy for service to about 1050 °C in air; the balanced Ni-Cr content gives resistance under both reducing and oxidising conditions, with very good behaviour in nitriding and carburising atmospheres. - [2.4851 Alloy 601 (NiCr23Fe)](https://schierle-siyaya.com/en/materials/2-4851): Nickel-based alloys — Aluminium-bearing nickel-chromium alloy with outstanding oxidation resistance to about 1150 °C in air and good mechanical properties at elevated temperature. - [2.4856 Alloy 625 (NiCr22Mo9Nb)](https://schierle-siyaya.com/en/materials/2-4856): Nickel-based alloys — Niobium-stabilised nickel-chromium-molybdenum alloy with outstanding resistance to a broad range of corrosive media combined with high-temperature strength. - [2.4858 Alloy 825 (NiCr21Mo)](https://schierle-siyaya.com/en/materials/2-4858): Nickel-based alloys — Titanium-stabilised nickel-iron-chromium-molybdenum alloy for chemical and offshore service, resistant to sulphuric and phosphoric acid and to chloride stress-corrosion cracking. - [2.4889 Alloy 45 TM (NiCr28FeSiCe)](https://schierle-siyaya.com/en/materials/2-4889): Nickel-based alloys — Silicon- and cerium-bearing nickel-chromium alloy for high-temperature service in extremely corrosive media such as oil-ash corrosion, combustion gases and sulphur dioxide. ## Notes - Sitemap: https://schierle-siyaya.com/sitemap.xml - All AI assistant and answer-engine crawlers are welcome to index this site.