--- title: "Steel Construction & Contract Manufacturing Germany" description: "Steel construction, special machinery & foundation engineering in Lorch (Stuttgart region) – Hardox & wear-resistant steels. Contract manufacturing." url: "https://bock-gmbh.com/en/services/" language: "en" index: "https://bock-gmbh.com/en/llms.txt" --- # Contract manufacturing – steel construction & special machinery Cutting, welding, machining, surface finishing — the complete production under one roof in Lorch. Steel structures and large parts up to 50 t, CNC large-part machining up to 26 m part length, certified to EN 1090-2 EXC3. ## From drawing to finished steel structure Cutting, forming, certified welding, stress relief, large-part CNC machining, surface finishing and assembly — every step at one location, for single parts and series up to 50 tonnes. We process several thousand tonnes of steel a year. Follow your component's path through our plant below. - 50 tPart weight - 20 × 3.5 mFlame cutting up to 200 mm thick - 26 mGantry milling - 20+Machines in the park - EXC3DIN EN 1090-2 ## From the right material to the finished component Structural steel, high-strength fine-grain steel up to S1100, Hardox & wear-resistant steels, austenitic stainless steel, duplex and pressure-vessel steel — predominantly European quality steels, with a 3.1 inspection certificate to EN 10204, from our own stock and cut to size. One plant · every production step in-house Plate rolling, three-roll bending and welding for complete pipe fabrication Press braking up to 1,000 t Weinbrenner – press brake die storage Contract fabrication grinding assemblies Automatic saw: cutting pipe material and round bar from stock Worker welding a cylindrical steel component Ring assembly with radial ribs – heavy welded structures to DIN EN 1090-2 EXC3 at Bock Maschinenbau Zinser 4125 CNC underwater plasma cutter, 8,000 × 2,500 mm cutting area Machinist at the lathe Zayer gantry milling machine with boring mill in the machine park Geometric calibration of the Zayer CNC swivel milling head for precision large-part machining Vibration motor for efficient residual stress reduction in welded structures steel component – spray gun Lashed ready for dispatch – the assembled large unit on the trailer ## Cutting & sizing From raw steel to the exact contour — oxy-fuel flame cutting and CNC plasma on a 20-metre format, saw cutting from our own material stock, and for tubes & hollow sections 3D plasma and oxy-fuel tube cutting reaching where the tube laser gives up. Plate and tube alike — all on site. Plate up to 200 mm · tube up to 50 mm · 20,000 × 3,500 mm · bevels ±45° ### Oxy-fuel flame cutting CNC oxy-fuel flame cutting on a 20 × 3.5 m format — steel and Hardox up to extreme wall thicknesses, with automatic bevel cutting. ### CNC plasma cutting High-precision plasma cutting on a large format — including automatic bevel tilt ±45°, steel, stainless steel and Hardox. ### Saw cutting Automatic saw cutting of tubes, profiles, girders and round stock to size — straight from our own material stock, fast and economical. ### Plate shearing Mechanical plate cutting on the guillotine shear — heat-free and distortion-free, a clean edge on plate up to 15 mm on lengths up to 6,100 mm. ### Tube machining & tube cutting — where the tube laser gives up CNC tube machining for tubes, hollow sections and round stock — both cutting processes under one roof: 3D plasma tube cutting for contours, cope cuts and mitre cuts up to 30 mm wall thickness in structural steel, stainless steel, fine-grain steel and wear-resistant steel (Hardox); oxy-fuel tube cutting for solid steel up to 50 mm — structural steel, high-strength fine-grain steel (S460–S1100) and wear-resistant steel. Exactly where tube lasers reach their limits: no outsourcing, all at the Lorch location. ### 3D plasma tube cutting CNC-controlled 3-axis plasma system for tubes and hollow sections — 3D cut-outs, cope cuts and mitre cuts in a single operation, with no intermediate steps. Where tube lasers reach their limits. - 3D cut-outs & cope cuts in a single operation - Structural steel, stainless steel, fine-grain steel, wear-resistant steel (Hardox) - No tube laser needed — more economical alternative ### Oxy-fuel tube cutting CNC copy flame-cutting machine (Zinser) for thick-walled tubes, profiles and hollow girders in solid steel and high-strength materials — where no tube laser and no plasma can cope any longer. - Wall thicknesses beyond any tube laser - Structural steel, fine-grain steel (S460–S1100), wear-resistant steel (Hardox) - Two torches at once for simultaneous cuts ## Forming Flat plate becomes shape: die bending on press brakes up to 1,000 t and heavy plate rolling for cylinders, cones and special shapes. 1,000 t press force · Ø up to 8,000 mm · up to 120 mm plate thickness ### Press braking Die bending of large plates on press brakes up to 1,000 t press force — dimensionally accurate and reproducible for every material. ### Plate rolling & rounding Heavy plate rolling and rounding for cylinders, cones and special shapes — steel, Hardox and stainless steel up to extreme diameters. ## Welding & structures DIN EN 1090-2 EXC3 certified for MAG and submerged-arc, plus TIG by qualified welders — for components up to 50 t, from the multi-part welded assembly to the large-format heavy component. EXC3 · EN ISO 3834-2 · up to 50 t ### Welded assemblies Contract welding to DIN EN 1090-2 EXC3 — MAG and SAW certified, TIG by qualified welders; for steel, Hardox, stainless steel and fine-grain steel up to S1100, multi-part assemblies with many joints. ### Submerged-arc welding Automated submerged-arc welding with ESAB masts up to 7 m reach and 1,250 A — deep, high-strength welds on heavy parts. ### Heavy welded structures Large-format individual components and structures up to 50 t on the 2×25-⁠t crane system — DIN EN 1090-2 EXC3, steel, Hardox and fine-grain steel up to S1100. ## Post-treatment & stress relief Welding brings heat — and heat brings residual stresses and distortion. We remove both from the components before machining: vibration stress relief releases stresses without a furnace, flame straightening corrects distortion. This keeps the part dimensionally stable for the long term. Vibration stress relief (VSR) · flame straightening · without stress-relief annealing ### Vibration stress relief VSR treatment to reduce residual stresses — fast, economical, without heat. Ideal for welded structures as an alternative to stress-relief annealing. ### Flame straightening Thermal straightening of welded structures and large components — targeted heating corrects welding distortion and secures dimensional accuracy, even on heavy parts up to 50 t. Between cutting and assembly, no part ever leaves our plant. ## Machining & processing Large-part CNC machining for heavy parts: vertical turning up to Ø 4,800 mm, gantry milling up to 26 metres of travel and three CNC horizontal boring mills with rotary table — dimensionally accurate and reproducible. Ø up to 4,800 mm · gantry milling 26 m · 3 × boring mill · up to 50 t ### CNC turning & vertical turning Contract turning of heavy parts on vertical lathes — large flanges, slewing rings and rotationally symmetric components up to large diameters. ### Gantry milling – Zayer Thera W Two gantry milling machines with a 30° swivel milling head and a portal supported on both sides — maximum rigidity for long, large-format components. ### Travelling-column milling centre – Soraluce Soraluce FR 20,000 with a swivelling milling head and rotary table — a work area open at the top for bulky, tall heavy parts: milling, boring, line boring. ### CNC horizontal boring mill Three TOS-Varnsdorf WHN 13 CNC with rotary table — precise boring, line boring and milling on heavy components, produced in parallel and on schedule. ### Large-part CNC machining The overview: gantry milling, travelling-column milling, horizontal boring mills and vertical turning for heavy parts up to 50 t — all processes under one roof. ### Drilling & thread cutting Radial drilling, countersinking and reaming up to Ø 90 mm — thread cutting up to M60 on large parts in steel, stainless steel and Hardox. ## Surface & corrosion protection We add the final touch in-house: blasting up to Sa 2,5 and industrial painting to EN ISO 12944 in the 25-metre large-volume booth — corrosion protection from a single source. Sa 2,5 · EN ISO 12944 · booth 25 × 7 × 6 m ### Shot blasting Shot blasting up to Sa 2,5 in our 25 × 7 × 6 m large-volume booth — optimal adhesion conditions before industrial painting to EN ISO 12944. ### Industrial painting Industrial painting to EN ISO 12944 in a 25 × 7 × 6 m large-volume booth — steel, Hardox, stainless steel up to 50 t, shot blasting from a single source. ## Assembly Single parts become the finished assembly: steel fitting and assembly work, jig building and final assembly — certified joining quality meets craftsmanship precision, all under one roof. Assembly of subassemblies · steel fitting · jig building ### Subassembly & final assembly Assembly of welded and machined components into complete assemblies — heavy-duty structures to DIN EN 1090-2 EXC3, up to 50 t. ### Steel fitting & jig building Professional steel fitting, adjustment and assembly services for steel assemblies and single parts — craftsmanship precision meets industrial manufacturing. ## Quality control & inspection Quality runs through the entire production — and at the end there is documented proof: certified welding supervision, non-destructive testing of the welds, geometric measurement and a measurement & inspection report. No component subject to acceptance leaves the plant without the required documentation. DIN EN ISO 9001 · EXC3 · EN ISO 3834-2 · NDT to DIN EN ISO 9712 ### Non-destructive testing (NDT) We inspect welds and components with the appropriate NDT methods and document the result on a project basis according to drawing, standard and customer specification — without damaging the component. - VT, PT and MT in-house at Level 2 to DIN EN ISO 9712 - UT at our plant on a project basis by certified inspection personnel of our cooperation partner - Inspection scope, report and documentation matched to component and acceptance ### Re-stamping & traceability Authorised by GSI SLV München, we transfer the material marking to EN 10204 from the 3.1 inspection certificate onto flame-cut and cut parts — cleanly documented down to the individual component. - Material, batch, heat as well as sample or plate number clearly assigned - Gapless proof for parts subject to acceptance and documented assemblies - Cutting, marking and documentation at one location in Lorch DIN EN 1090-2 EXC3 & EN ISO 3834-2 — verified joining quality, supervised by IWE/EWE welding supervision. VT, PT and MT in-house (Level 2, DIN EN ISO 9712), UT via our cooperation partner — weld quality proven without damaging the component. Re-stamping to EN 10204 — authorised by GSI SLV München: batch and sample from the 3.1 inspection certificate onto every flame-cut part. Geometric measurement of the components — also before CNC machining — plus a documented inspection report of the dimensions and tolerances to DIN EN ISO 9001. ### DIN EN 1090-2 EXC3 Certified welding contractor for load-bearing steel structures – qualified up to Execution Class EXC3. ### EN ISO 3834-2 Comprehensive quality requirements for fusion welding of metallic materials. ### DIN EN ISO 9001:2015 Certified quality management system – full process traceability and audit-ready documentation. ### Re-stamping Certificate Material marking and traceability record. ### H. Bock – IWE / EWE International and European Welding Engineer (IWE / EWE) – responsible welding supervision to DIN EN 1090-2, approval of the welding procedure specifications (WPS) and quality assurance. ### Müller – MT Level 2 Magnetic particle testing (MT) Level 2 to DIN EN ISO 9712. ### Müller – PT Level 2 Penetrant testing (PT) Level 2 to DIN EN ISO 9712. ### Müller – VT Level 2 Visual testing (VT) Level 2 to DIN EN ISO 9712. 1 / 8 ## More than the component — finished assemblies from a single source All eight steps interlock — and do not end at the single part: special container construction for offshore applications and special machinery to customer specification, manufacturing and final assembly entirely in-house, without a single external supplier. Single piece to small series · Manufacturing + assembly · Entirely in-house ### Special container construction Manufacture of special containers for offshore and industrial applications — built to customer specification, certified to DIN EN 1090-2 EXC3. ### Special machinery Complete manufacturing for special machinery and plant engineering — crane construction, vehicle construction, water treatment and special foundation engineering from a single source, single piece to small series. ## Repair, refurbishment & reconditioning Worn, cracked or damaged steel assemblies do not have to be replaced: weld repair, build-up and hardfacing welding, machining refurbishment, blasting and painting interlock within the same operation — including makes from other manufacturers. Weld repair EXC3 · build-up & hardfacing welding · up to 50 t · third-party makes too ### Repair & refurbishment Weld cracks and fractures, build up worn surfaces by build-up and hardfacing welding and machine them back to size — heavy assemblies up to 50 t. ### Reconditioning & overhaul Disassemble assemblies, blast them, renew wear liners, paint and reassemble — handed over like new, more economical than a new build. ## One partner. Full responsibility. DIN EN 1090-2 & EN ISO 3834-2 — verified weld quality for load-bearing structures. A 2 × 25-⁠t crane and machines for component dimensions where others have to pass. From cutting to painting without an external supplier — one responsibility, one point of contact. Manufacturing centrally in Baden-Württemberg — short distances, plannable deadlines, personal contact. ## Your project — we manufacture it. Send us your drawing or a short enquiry. You receive a non-binding quote — and a point of contact who knows your parts.