Material and process
The challenges of machining steel
The steel grade, hardness and delivery condition determine cutting forces and tooling. Heavy or uneven material removal can release residual stress and cause distortion. Workholding and the machining sequence therefore need careful planning.
For welded components, welding and machining must be coordinated. Specify the exact material grade, critical fits and mounting surfaces so we can assess whether machining is needed after welding.
Technical starting points
Material suitability and execution criteria
Exact grade, operations and documentation are agreed for your component. The material examples below do not represent a stock list.
- Grades and condition
- State the steel standard, grade, product form and delivery condition. Include heat treatment and known hardness where they affect machining; structural steel alone is not a complete material specification.
- Operations
- Milling, turning, boring and welding can form part of the route. Datums and critical mounting surfaces determine the sequence of welding and machining.
- Material certificates
- State whether EN 10204 3.1 or 3.2 is required. Availability, inspection stages and the link between the heat or batch number and the component are agreed before procurement and production.
- Application and environment
- Shafts, flanges, machine components and frames have different requirements for strength, fit, wear and surface protection. Component function guides material and process selection.
Machines, welding and inspection
Explore the resources for your production route. The suitable machine, welding procedure and inspection approach are established for each workpiece.
Hedelius ACURA 85
Automated five-axis CNC milling for controlled precision work. Explore the key specifications, suitable workpieces and its role in the complete production route.
Measuring equipment and range
Coordinate critical features, measuring conditions and reporting with the drawing.
More about materials and machining
Metalworking: which process suits your component?
How do you choose a metalworking process? Compare machining, welding and finishing through geometry, material, tolerances and the required delivery condition.
Which factors determine how a forging is machined?
Initial shape, mill scale, material behaviour, workholding, machining sequence and tolerances together determine how a forging is brought to its final dimensions in a controlled way.
Questions about material and supply
Frequently asked questions about material management
Can you supply material with a 3.1 certificate and heat numbers?
State the required certificate type and traceability requirement in the enquiry. Availability of the material certificate and preservation of the link between heat and component are confirmed in advance. A 3.2 document needs additional arrangements for independent inspection; it is not an automatic retrospective alternative.
Can I supply my own material, forging or casting?
Provide material data, condition, starting form and available allowance. Technical assessment establishes the suitable machining route and incoming inspection. Customer-supplied material is not automatically suitable for the final geometry.
Can you finish-machine a customer-supplied steel forging or casting?
Provide the drawing, material data, delivery condition, starting dimensions and available allowance. Skin, shape variation, datums and fixturing options determine whether the final geometry is feasible. Douna assesses the route for each workpiece.
What should be agreed about cross-contamination and cleanliness?
Specify the required surface condition and any cleanliness criteria. Fixture cleaning, dedicated tools, storage and handling may be relevant. Applicable measures and inspections are established for the order.