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SS Round Bar Drawn EN1.4301/4307

Austenitic steels with designations 1.4301 and 1.4307 are the commonest stainless types and contain about 18% chromium and 9% nickel. The difference between the two grades is that in 1.4301, the maximum allowed carbon content is higher than for 1.4307 which can mean that 1.4301 has marginally higher strength. In practice, the difference in carbon between 1.4301 and 1.4307 is often of little significance. However, if welding is to be performed, 1.4307 is the preferred alternative since corrosion resistance in the vicinity of the weld could be impaired for 1.4301.

Cold-drawn rounds in 1.4301/1.4307 are standardised in EN 10088-3. This standard covers cold-finished round bars with diameters up to 250 mm even though it is normally only smaller dimensions that are available in cold-drawn execution. Tibnor’s programme encompasses diameters up to and including 30 mm.

Grades 1.4301 and 1.4307 show good resistance to corrosion in neutral water both indoors and outdoors. The steels also exhibit immunity from atmospheric corrosion. However, these stainless grades are less suitable if the environment is acidic or contains chlorides. In such instances, higher alloyed grades will be needed.

Cold-drawn bars of 1.4301 and 1.4307 exhibit quite good cold formability even though ductility is decreased as a result of cold working. In addition, the steels are characterised by excellent weldability. Austenitic stainless grades like 1.4301 and 1.4307 are generally troublesome to machine but working is facilitated through bespoke tooling. If good machinability is an important consideration for the application at hand, the sulphur-alloyed austenitic grade 1.4305 could constitute a better alternative.

The surface finish of 1.4301/1.4307 as stocked is 2H as defined in EN 10088-3.  Cold drawing is carried out on hot-rolled bars which have been annealed and pickled but even then, small shallow surface defects can remain. Hence, for parts or structures subjected to high loads, the cold-drawn surface should not be left unworked. The diameter tolerance of drawn bars is h9 as stipulated in ISO 286 - 2 which is a zero-minus tolerance. In other words, the actual diameter is marginally less than the nominal one. The bars are very straight with maximum height of arc below 0.001 x length.

Austenitic steels with designations 1.4301 and 1.4307 are the commonest stainless types and contain about 18% chromium and 9% nickel. The difference between the two grades is that in 1.4301, the maximum allowed carbon content is higher than for 1.4307 which can mean that 1.4301 has marginally higher strength. In practice, the difference in carbon between 1.4301 and 1.4307 is often of little significance. However, if welding is to be performed, 1.4307 is the preferred alternative since corrosion resistance in the vicinity of the weld could be impaired for 1.4301.

Cold-drawn rounds in 1.4301/1.4307 are standardised in EN 10088-3. This standard covers cold-finished round bars with diameters up to 250 mm even though it is normally only smaller dimensions that are available in cold-drawn execution. Tibnor’s programme encompasses diameters up to and including 30 mm.

Grades 1.4301 and 1.4307 show good resistance to corrosion in neutral water both indoors and outdoors. The steels also exhibit immunity from atmospheric corrosion. However, these stainless grades are less suitable if the environment is acidic or contains chlorides. In such instances, higher alloyed grades will be needed.

Cold-drawn bars of 1.4301 and 1.4307 exhibit quite good cold formability even though ductility is decreased as a result of cold working. In addition, the steels are characterised by excellent weldability. Austenitic stainless grades like 1.4301 and 1.4307 are generally troublesome to machine but working is facilitated through bespoke tooling. If good machinability is an important consideration for the application at hand, the sulphur-alloyed austenitic grade 1.4305 could constitute a better alternative.

The surface finish of 1.4301/1.4307 as stocked is 2H as defined in EN 10088-3.  Cold drawing is carried out on hot-rolled bars which have been annealed and pickled but even then, small shallow surface defects can remain. Hence, for parts or structures subjected to high loads, the cold-drawn surface should not be left unworked. The diameter tolerance of drawn bars is h9 as stipulated in ISO 286 - 2 which is a zero-minus tolerance. In other words, the actual diameter is marginally less than the nominal one. The bars are very straight with maximum height of arc below 0.001 x length.

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