The process removes all scale, surface defects and surface decarburisation, aiding subsequent operations, without significantly changing the elastic limits or work hardening the material.
For the engineer it provides the opportunity to commence production from bar stock at the optimum diameter, saving machining costs and material wastage.
For the stockholder, it provides the opportunity to convert one stock size to a variety of other sizes including hexagonal and octagonal sections to rounds.
The process also offers both the engineer and the stockholder the possibility of recovering surface damaged material, as well as surplus or obsolete stock.
Bar is often purchased from the producer in the heat treated condition.
To make our bar stock more flexible we also use the services of sub-contract heat treatment companies.
We offer bar in the following conditions:-
- Hardened and Tempered to customer requirement
- Annealed to customer requirement
- Stress relieved
Cutting to Length
At GB Steels we have made it an integral part of our business to be able to supply our customers with steel bar cut to a precise length.
We can offer the following fully automatic saws which are frequently operated 24 hours per day :
- Carbide tipped circular saws
- Band saws
- Mitre Cuttng
Your requirements can be processed from a ‘one off’ to batch quantities.
The cut pieces can be delivered in bins, polyweave bags and pallets whichever is most appropriate.
Unprotected steel will inevitably corrode or as generally stated rust. One of the most commonly used and effective treatments to prevent corrosion is to coat the surface of the steel with zinc.
Zinc will form a stable surface layer of zinc oxide (white rust) which seals the surface preventing further corrosion. Should the surface suffer minor damage, the zinc coating will effectively ‘heal’ itself.
The two most popular techniques for applying zinc to the surface of steel are:-
- Zinc plating – also known as electrogalvanizing
- Hot dip galvanizing
Both techniques commence with the removal of the surface layer of iron oxide (mill scale and/or rust) from the product followed by:-
Zinc plating. The product to be coated is immersed in a tank containing a solution of zinc salts. The zinc coating is electrodeposited onto the surface of the steel.
After zinc plating the zinc coating is generally passivated to increase the protective value of the coating.
To minimise the potential for the zinc plated product to fail due to hydrogen embrittlement (hydrogen can migrate into the product during the plating process) it is good practice to ‘bake’ the product which liberates the hydrogen.
Hot dip galvanizing. The product to be coated is immersed in a heated tank containing liquid zinc at approximately 450°C. A zinc-iron alloy layer forms on the product surface which bonds the outer layer of zinc to the product.
G.B. Steels will be pleased to arrange for your steel requirement to be surface coated.
We use the services of a subcontractor to offer bar which has been zinc plated, zinc plated and passivated or galvanized.