Process
 
Production capacity
50,000 tonnes per year
 
Dimension range
5-100 mm (round) and equivalent profiles.
5-32 mm (round) and 5-27 mm hexagonal drawn from coil in 3 Schumag benches
30-100 mm (round) and 25-70 mm hexagonal drawn from bar in 2 bar draw benches
Drawing in 3-week campaigns
 
Standard range
Free cutting steel
(approx. 55% of total volume)
 
Carbon steel
General engineering steel
Stainless free cutting steel
Key steel
Profile breakdown
Round bars approx. 80% of manufactured products
Hexagonal bars, approx. 15%
Flat and square bars, approx. 5%
Special profiles, 400 tonnes
 
Sales
Sweden, 50%
Rest of Nordic region, 25%
Rest of Europe, 25%
Sales directly from stock, 60%
Manufacturing orders, 40%
 
Stock
Raw materials, approx. 3,000 tonnes
Finished products approx. 5,000 tonnes
Variants in stock, approx. 600
 
Stock of drawing dies with register
Our stock consists of around 2,700 drawing dies that are listed in a computer program which also includes information about each individual die (which are numbered) the latest draw, dimension and drawn weight.
Drawing dies are available for:
5 – 101,6 mm
Round bar
5 – 70 mm
Hexagonal bar
5 – 70 mm
Square bar
Flat bar
Width 8 – 100 mm
 
Thickness 3 – 55 mm
Key steel
Acc to SS 212190
Special profiles
max area 5 000 mm2
 
 
 
 
Raw material intake, coil
In the 5 –32 mm ψ dimension range and equivalent profiles we draw from coil to bar.
Schumag draw bench no 1
Dimensions:
5 – 16 mm round bar
 
5 – 14 mm hexagonal bar
 
5 – 12 mm square bar
Drawing force:
5 tons
Coilweight:
ca 2 000 kg
Operations:
Pre-straightening – Shot blasting – Drawing – Straightening of hexagonal bar
Cutting – Straightening of round bar – Bundling, approx. 1,000 kg.
- Marking
 
 
Schumag draw bench no 2
Dimensions:
10 – 28 mm round bar
 
10 – 27 mm hexagonal bar
 
10 – 22 mm square bar
Drawing force:
10 tons
Coilweight:
ca 2 000 kg
Operations:
Pre-straightening – Shot blasting – Drawing – Straightening of hexagonal bar
- Cutting – Straightening of round bar – End chamfering and planishing of free cutting steel
- Bundling, approx. 1,000 kg
- Marking
 
 
Schumag draw bench no 3
Dimensions:
10 – 32 mm round bar
 
10 – 27 mm hexagonal bar
 
10 – 25 mm square bar
Drawing force:
15 tons
Lengths:
2,5 – 8 m
Speedt:
25 – 100 m/min
Machine length:
63 m
Machine weight:
91 ton
Power:
1 500 kW
Control system:
Siemens Siematic S5
 
 
Operations:
Pre-straightening – Shot blasting – Drawing – Straightening of hexagonal bar
- Cutting – Straightening of round bar - Forming the edges and planishing of free cutting steel
- Bundling, approx. 1,000 kg - Marking
 
 
 
 
Raw material intake, bar
In the dimension range from Ψ 32 mm and equivalent profiles we draw from bar to bar.
Bar draw bench
Dimensions:
30 – 70 mm round bar
 
27 – 65 mm hexagonal bar
 
25 – 55 mm square bar
Drawing force:
30 ton
Bundle weight:
approx 5 tons
Operations:
Pushing – Drawing – Straightening
 
 
Triple draw bench
Operations:
Shot blasting - Pushing – Drawing – Straightening
Dimensions:
25 – 100 mm round bar
 
25 – 70 mm hexagonal bar
 
25 – 65 mm square bar
 
max 100 x 55 mm flat bar
 
min 50 x 5 mm flat bar
Power shotblasting
4 x 37 kw
Pushing force:
100 tons
Drawing force:
50 tons
Drawing:
max 3 bars at the same time
Max bar length:
12 m
Bundle weight:
5 ton
Speed:
max 95 m/min
Machine weight:
200 tons
Control system:
Siemens
Programme size:
60 kB
Power:
1 600 kW
 
 
Straightening machine
(Wyko)
Straightening machine for bar material.
25 – 70 mm
Hexagonal bar
20 – 70 mm
Square bar
100 x 55 mm.
Flat bar
 
 
 
 
Bar cutting
(Kaltenbach)
Dimensions:
25 – 100 mm round bar and corresponding profiles
Prior to cutting, the material is handled in 5-tonne bundles and in lengths of around 6 meters. The first end’s grip marks are removed, the free cutting steel is split in the middle and end-chamfering is performed. After bundling and weighing, the material is dispatched to the warehouse.
 
 
 
 
Bar cutting
(Behringer)
Dimensions:
25 – 100 mm round bar
Prior to cutting, the material is handled in 5-tonne bundles and in lengths of around 6 meters. The first end’s grip marks are removed, the free cutting steel is split in the middle and end-chamfering is performed. After bundling and weighing, the material is dispatched to the warehouse. Bundling is automatic.
 
 
 
 
 
Stock
Approx. 5,000 tonnes of finished stock.
600 stock items.
60% of outgoing deliveries are standard products.
40% of deliveries are manufactured on order, special steel grades,lengths or tolerance.
 
 
 
Crack detection
(Fφrster)
Circograph Ro65 with 4 rotating probes used for round material.
Defectomat M170 with surrounding spools used for hexagonal material.
Dimensions:
6 – 65 mm
round bar
6 – 55 mm
hexagonal bar
 
 
 
Annealing furnace
(UTAB)
Max temperature: 950˚C
Temperature, timing and cooling are performed under controlled conditions.
 
 
 
High speed cutting machine
6 – 21 mm or equivalent profile
Upgraded with a modern control system in 2000.
 
 
 
Precision cutting
• Behringer saw 1 & 2
• Kasto saw
• DryTech circular saw (2005)
 
 
End machining
8 – 90 mm round and hexagonal bars
Drilling of spike holes, maximum 9.5 mm in diameter
Turning of handles, max length 35 mm can be performed.
 
 
 
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Boxholm Stål AB - Box 1, SE-590 10 Boxholm - Tel: +46(0)142-55100, fax: +46(0)142-51968 - info@bxs.se