--- title: "Materials: steel, stainless steel, wear steel" description: "Structural steel, fine-grain steel up to S1100, wear steel, stainless & duplex – processed with inspection certificate 3.1, cut-to-size from stock in Lorch." url: "https://bock-gmbh.com/en/services/materials/" language: "en" index: "https://bock-gmbh.com/en/llms.txt" --- # Materials: the steels and metals we process Structural steel, high-strength fine-grain steel up to S1100, wear-resistant steels, austenitic stainless steel, duplex and pressure vessel steel – predominantly European quality steels, with an inspection certificate 3.1 to EN 10204, from our own stock and cut to the size you need. Customer-supplied castings are finish-machined, blasted and painted by us. Contract manufacturing in Lorch, with no minimum quantities. ## Steel, stainless steel & wear-resistant steel — processed in southern Germany From structural steel through wear steel and stainless steel to duplex: jump straight to material families, catalogue, machining and certificates. - 9Material groups - 40+processed material grades - 3.1Inspection certificate EN 10204 - 50 tComponents up to ## Our material families An overview of the material groups we process most often: ### Structural steel Structural and construction steel S235, S355 and S355J2+N as well as E295/E355 – the standard for steel construction and welded structures. ### Fine-grained structural steel (high-strength) High-strength, weldable fine-grained structural steel from S460 through S690QL, S890QL and S960 up to S1100QL – for lightweight, heavy-duty structures. ### Wear-resistant steel Wear-resistant steels Hardox 400/500, XAR, Dillidur, Creusabro and Brinar – for bulk-material, conveying and abrasion applications. ### Stainless steel (austenitic) Corrosion-resistant stainless steel 1.4301, 1.4307, 1.4404, 1.4541 and 1.4571 (V2A/V4A) – for plant engineering, chemical and apparatus applications. ### Duplex & special materials Duplex stainless steel 1.4462 and additional special materials on request – high strength combined with high corrosion resistance. ### Pressure-vessel steel Pressure-vessel and creep-resistant steels P265GH, P355GH, 16Mo3 and 13CrMo4-5 – for apparatus and pressure-equipment construction to AD 2000. ## Materials we have already processed An extract of the material groups and grades we have already processed in contract manufacturing – steels in cutting, welding and machining, cast iron exclusively in mechanical machining: | Material group | Grades & brands (selection) | | Structural steel | S235 (St37), S355 (St52), S355J2+N (St52-3N, 1.0577, 1.0570), E295 (St50-2), E355 (St52), Corten steel (S355J2W, S355J2WP) | | Fine-grained structural steel (high-strength) | S460 (StE460), S690QL (TStE690V, 1.8928), S890QL (TStE890V, 1.8983), S960 (StE960V), S1100QL, S700MC (QStE690TM, 1.8974) | | Wear-resistant steel | Hardox 400/500, XAR 400, Dillidur, Creusabro, Brinar, Weldox (Strenx) | | Stainless steel (austenitic) | 1.4301 (V2A, X5CrNi18-10), 1.4307 (X2CrNi18-9, AISI 304L), 1.4404 (X2CrNiMo17-12-2, AISI 316L), 1.4541 (X6CrNiTi18-10, AISI 321), 1.4571 (V4A, X6CrNiMoTi17-12-2, AISI 316Ti), AISI 304/316 | | Duplex | 1.4462 (X2CrNiMoN22-5-3, 2205) | | Pressure-vessel steel | P265GH (HII), P355GH (19Mn6), 16Mo3 (1.5415, 15Mo3), 13CrMo4-5 (1.7335, 13CrMo44), A516 | | Quenched and tempered steel | 42CrMo4 (1.7225, AISI 4140), 34CrNiMo6 (1.6582, AISI 4340), C45 (C45E, Ck45), 16MnCr5 (1.7131) | | Tool steel (martensitic) | 1.4021 (X20Cr13), 1.4057 (X17CrNi16-2), 1.2312 (40CrMnMoS8-6), 1.2083 (X40Cr14) | | Cast iron | GJS (GGG), EN-GJS-400/500 (GGG40/GGG50) | The list is an extract – material, grade and certificate are matched per project to the drawing and intended use. Further materials are available on request. CNC large-part machining for these materials ## Which materials does Bock process? As a contract manufacturer for steel construction and special machinery, we process a broad range of steels and metals – from classic structural steel through high-strength fine-grain steel and wear-resistant steel to stainless steel, duplex and pressure vessel steel. Which material is used depends on your drawing, the load and the intended purpose. A material stock of several hundred tonnes in common grades makes us fast and flexible: plates, sections and tubes are in stock, so we can react at short notice and cut directly from stock – without lengthy material procurement and without minimum quantities. We prefer European quality steels with traceable origin. For special materials this is not always possible – here the origin depends on availability and your specification. For all materials used we provide material certificates to EN 10204 on request. From cutting through forming and certified welding to CNC large-part machining and testing, the entire processing runs at one site in Lorch – one contact, seamless traceability throughout. All manufacturing steps at a glance Plates, sections and tubes in common grades held in stock – short response times and cutting straight from stock, without lengthy material procurement. We prefer European quality steels with traceable origin; for special materials according to availability and customer specification. Inspection certificate 3.1 to EN 10204 with material, heat and sample – provided per project for the materials used. Material marking to EN 10204 transferred onto every cut part – authorised by GSI SLV München, on request. Lamination and ultrasonic testing via our cooperation partner, VT/PT/MT in-house as well as material tests such as tensile and impact testing on request – depending on the inspection requirement. You supply your own material or we procure the right materials – we process both (material provision). ## From material to component – our processing methods Processing runs entirely at our Lorch site – cutting, welding, machining. An extract of the methods: ### Oxy-fuel cutting Flame-cutting of structural steel, fine-grain steel and wear steel up to extreme wall thicknesses – on a 20-metre format. ### CNC plasma cutting Precise plate cutting in steel, stainless steel and wear steel with automatic bevel cut up to ±45°. ### Saw cutting Tubes, sections, beams and round material cut to size – straight from our own material stock. ### Welded assemblies Certified welding to DIN EN 1090-2 EXC3 – steel, wear steel, stainless steel and fine-grain steel up to 50 t. ### CNC gantry milling Large-part machining on the Zayer Thera W up to 26 m of travel – steel, wear steel, stainless steel and customer-supplied castings. ### CNC turning & vertical turning Rotationally symmetrical heavy parts up to Ø 4,800 mm in steel, wear steel and stainless steel. ### CNC horizontal boring mill Boring, back-boring and milling on heavy components – three TOS-Varnsdorf WHN 13 with rotary table, including cast housings to drawing. ### CNC large-part machining The overview: milling, boring and turning for heavy parts up to 50 t – all methods under one roof. ## Material certificates, re-stamping and material testing We document material quality and origin per project. For the materials used we provide inspection certificates 3.1 to EN 10204 – with material, heat or melt, plus sample and plate number. ### Re-stamping & traceability to EN 10204 When a large plate is cut into individual parts, only the remaining plate carries the original material marking. Authorised by GSI SLV München, we transfer this marking to each individual cut part in accordance with the standard, so that every part remains clearly assigned to its certificate. - Visual (VT), dye-penetrant (PT) and magnetic-particle (MT) testing are available in-house through our own inspection personnel at Level 2 to DIN EN ISO 9712. - Lamination and ultrasonic testing (UT) are carried out at our plant on a project basis by certified inspection personnel of our cooperation partner. Material tests such as tensile and notched-bar impact bending tests we carry out via a testing laboratory when required – depending on the requirement and inspection specification. Volumetric testing (radiographic testing RT, ultrasonic testing UT) is, insofar as commissioned, provided by qualified partners. This allows material properties, internal irregularities and laminations in the material to be verified and documented – the basis for components subject to inspection. We agree the scope of testing and documentation per project according to drawing, standard and customer specification – from a simple material certificate to a certified re-stamping declaration. Re-stamping declaration to EN 10204 ## Material certificates and re-stamping certificate ### Re-stamping Certificate Material marking and traceability record. 1 / 1 ## Test, certify, treat – quality around the material Material testing, traceability and stress relief complement the processing: ### Non-destructive testing (NDT) Lamination and ultrasonic testing (UT) via our cooperation partner as well as VT, PT and MT in-house – material and weld inspected without damaging the component. ### Re-stamping declaration Material marking to EN 10204 from the inspection certificate 3.1 onto every cut part – authorised by GSI SLV München. ### Vibration stress relief Targeted reduction of residual stresses in the material – without a furnace, as an economical alternative to stress-relief annealing. ### Certifications & evidence DIN EN 1090-2 EXC3, EN ISO 3834-2, ISO 9001 and AD 2000 HP0 – the tested quality framework for your materials. ## Not just many materials – the complete know-how behind them Plenty of companies have many materials on the shelf. The difference at Bock: every material comes with the complete know-how – expertise, skilled staff, quality assurance, the right machinery and the right special tools. Exactly this breadth under one roof turns raw material into a finished, inspection-proof component – and makes Bock your materials expert. ### Breadth of materials From structural steel through high-strength fine-grain steel up to S1100, wear steel, austenitic stainless steel, duplex and pressure vessel steel – predominantly European steel, from our own stock. ### Materials know-how Decades of experience in which material belongs where and how it behaves during cutting, welding and machining – the right choice of material begins with the consultation. ### Skilled staff Over 100 welders, cutting-machine operators and industrial mechanics as well as certified inspection personnel at Level 2 to DIN EN ISO 9712. ### Quality assurance Inspection certificate 3.1 to EN 10204, re-stamping, non-destructive testing and DIN EN 1090-2 EXC3 – seamless traceability from plate to component. ### Machinery Complete machinery under one roof – cutting, forming, certified welding and CNC large-part machining for heavy parts up to 50 t and 26 m. ### Tools and special tools A tooling pool grown over decades – long boring and back-boring bars, angle milling heads, special cutters and thread-cutting tools for almost any geometry. ## Why Bock as the manufacturing partner for your components We are your manufacturing service provider, not a steel producer: we procure the right materials and process them with the complete machinery in-house – from cutting through welding and machining to testing. That saves interfaces, time and cost: - From stock & fast - Extensive material stock in common grades – short response times and fast cutting without lengthy material procurement. - Your material or ours - We process materials from our stock just as readily as material you supply (material provision) – you decide, we manufacture. - Predominantly European steel - Preferably European quality steels with traceable origin; special materials according to availability and customer specification. - Seamless traceability - Inspection certificate 3.1 to EN 10204 and re-stamping – material, heat and sample assigned down to the individual component. - Everything under one roof - From cutting through welding and machining to testing – one site, one contact, one responsibility. - Testing as needed - NDT, lamination testing and material tests such as tensile and impact testing per project – exactly as much evidence as your inspection requires. All services at a glance ## Frequently asked questions about materials ### Which materials are processed at Bock? URL: https://bock-gmbh.com/en/services/materials/#faq-werkstoffe-verarbeitet We process structural steel (S235, S355), high-strength fine-grain steel up to S1100, wear steel (Hardox, XAR, Dillidur), austenitic stainless steel (1.4301 to 1.4571), duplex 1.4462, pressure vessel and quenched & tempered steels – according to drawing and customer specification. Customer-supplied castings are finish-machined, blasted and painted by us; we do not source, cut or weld cast iron. Further materials are available on request. CNC large-part machining ### Is an inspection certificate 3.1 to EN 10204 provided? URL: https://bock-gmbh.com/en/services/materials/#faq-abnahmepruefzeugnis-en-10204 Yes. For the materials used, inspection certificates 3.1 to EN 10204 with material, heat and sample are provided per project. In the steel trade this document is often loosely called a “works certificate 3.1” — however, “works certificate” renders the German “Werkszeugnis 2.2”, which is the test report under DIN EN 10204; what is supplied is the inspection certificate 3.1. When plates are cut up, the marking is transferred to every individual part by re-stamping. ### What is a lamination test? URL: https://bock-gmbh.com/en/services/materials/#faq-doppelungspruefung The lamination test is an ultrasonic test (UT) that detects internal material separations (laminations) in the plate. It is available at our plant per project through certified inspection personnel of our cooperation partner. Non-destructive testing (NDT) ### Are material tests by a testing laboratory possible? URL: https://bock-gmbh.com/en/services/materials/#faq-materialpruefungen-prueflabor-moeglich Yes. Tensile tests, notched-bar impact bending tests and further material tests are possible when required via a testing laboratory – depending on the requirement and inspection specification. Certifications & evidence ### Where do the materials used come from? URL: https://bock-gmbh.com/en/services/materials/#faq-stammen-eingesetzten-werkstoffe Predominantly from Europe – European quality steels with traceable origin are preferred. For special materials this is not always possible; the origin then depends on availability and customer specification. ### Is material available from stock including cut-to-size? URL: https://bock-gmbh.com/en/services/materials/#faq-material-ab-lager-inklusive Yes. Plates, sections and tubes are held in stock in common grades and cut directly by oxy-fuel, plasma or saw – a fast response without lengthy material procurement. Saw cutting from stock ### Can material be supplied by the customer? URL: https://bock-gmbh.com/en/services/materials/#faq-material-selbst-beigestellt Yes. Supplied material is processed just like material we procure ourselves – with the complete machinery in-house. For material provision, the associated material certificates must be enclosed. Manufacturing options at a glance ### Does Bock weld or machine aluminium parts? URL: https://bock-gmbh.com/en/services/materials/#faq-aluminium-schweissen-zerspanen No. Bock neither welds nor machines aluminium. For aluminium, Bock exclusively offers non-destructive testing (NDT): visual testing (VT) and penetrant testing (PT) in-house, and ultrasonic testing (UT) through a partner when required. ## Request a material to your drawing Send us your drawing, material, grade and quantity. We check availability and feasibility and prepare a project-specific quotation – including cutting and material certificate. ### Alexander Schulz For new enquiries, quotations and technical questions on the feasibility of your project. ### Jochen Hack