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 a 3.1 mill certificate to EN 10204, from our own stock and cut to the size you need. Contract manufacturing in Lorch, with no minimum quantities.
Materials at a glance
Steel, stainless steel & cast iron — processed in southern Germany
From structural steel through wear steel and stainless steel to cast iron: jump straight to material families, catalogue, machining and certificates.
Material stock & cut-to-size
Plates, sections and tubes in common grades held in stock – short response times and cutting straight from stock, without lengthy material procurement.
Predominantly European steel
We prefer European quality steels with traceable origin; for special materials according to availability and customer specification.
Mill certificate 3.1
Inspection certificate 3.1 to EN 10204 with material, heat and sample – provided per project for the materials used.
Re-stamping available
Material marking to EN 10204 transferred onto every cut part – authorised by GSI SLV München, on request.
Testing & NDT
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.
Material supplied by you too
You supply your own material or we procure the right materials – we process both (material provision).
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.
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
Mill 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.
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.
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.
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.
Materials we have already processed
An extract of the material groups and grades we have already cut, welded and machined in contract manufacturing:
| Material group | Grades & brands (selection) |
|---|---|
| Structural steel | S235, S355, S355J2+N, E295, E355, Cortenstahl |
| Fine-grained structural steel (high-strength) | S460, S690QL, S890QL, S960, S1100QL, S700MC |
| Wear-resistant steel | Hardox 400/500, XAR 400, Dillidur, Creusabro, Brinar, Weldox |
| Stainless steel (austenitic) | 1.4301, 1.4307, 1.4404, 1.4541, 1.4571, AISI 304/316 |
| Duplex | 1.4462 |
| Pressure-vessel steel | P265GH, P355GH, 16Mo3 (1.5415), 13CrMo4-5 (1.7335), A516 |
| Vergütungsstahl | 42CrMo4 (1.7225), 34CrNiMo6, C45, 16MnCr5 |
| Werkzeugstahl (martensitisch) | 1.4021, 1.4057, 1.2312, 1.2083 |
| Guss | GJS, EN-GJS-400/500, 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.
From material to component – our processing methods
We process all materials on to the finished part 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.
To the method
CNC plasma cutting
Precise plate cutting in steel, stainless steel and wear steel with automatic bevel cut up to ±45°.
To the method
Saw cutting
Tubes, sections, beams and round material cut to size – straight from our own material stock.
To the method
Welded assemblies
Certified welding to DIN EN 1090-2 EXC3 – steel, wear steel, stainless steel and fine-grain steel up to 50 t.
To the method
CNC gantry milling
Large-part machining on the Zayer Thera W up to 26 m of travel – steel, wear steel and stainless steel.
To the method
CNC turning & vertical turning
Rotationally symmetrical heavy parts up to Ø 4,800 mm in steel, wear steel and stainless steel.
To the method
CNC horizontal boring mill
Boring, back-boring and milling on heavy components – three TOS-Varnsdorf WHN 13 with rotary table.
To the method
CNC large-part machining
The overview: milling, boring and turning for heavy parts up to 50 t – all methods under one roof.
To the methodTest, 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.
To the detail page
Re-stamping declaration
Material marking to EN 10204 from the 3.1 mill certificate onto every cut part – authorised by GSI SLV München.
To the detail page
Vibration stress relief
Targeted reduction of residual stresses in the material – without a furnace, as an economical alternative to stress-relief annealing.
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Certifications & evidence
DIN EN 1090-2 EXC3, EN ISO 3834-2, ISO 9001 and AD 2000 HP0 – the tested quality framework for your materials.
To the detail pageWhy 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
- Mill 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.
Frequently asked questions about materials
Which materials are processed at Bock?
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 as well as cast – according to drawing and customer specification. Further materials are available on request.
Is a 3.1 mill certificate to EN 10204 provided?
Yes. For the materials used, inspection certificates 3.1 to EN 10204 with material, heat and sample are provided per project. When plates are cut up, the marking is transferred to every individual part by re-stamping.
What is a lamination test?
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.
Are material tests by a testing laboratory possible?
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.
Where do the materials used come from?
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?
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.
Can material be supplied by the customer?
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.
Contact
Your project — right from the region
Send us your enquiry for contract manufacturing, structural steel or custom machinery — we'll get back to you promptly.
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.