ISO DIS 4955

Description / Abstract: This International Standard specifies requirements for the grades listed in Table 2 which are usually employed for products for which the resistance to the effects of hot gases and the products of combustion at temperatures in the region above 550° C and/or to long term mechanical stress is the main requirement.

NOTE 1 Grades mentioned in this document may also be used for corrosion and creep resistant purposes.

This International Standard is applicable to

— flat products;

— bars, sections, rod, semi-finished products and forgings.

NOTE 2 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and hammerforged bars are in the following covered under semi-finished products or bars and not under the term "forgings".

NOTE 3 Not all of the grades included in this International Standard are necessarily available in all product forms.

NOTE 4 In Table 2 two alloys are listed in addition to the steels since they belong to the heat resistant grades.

NOTE 5 Heat resistant wire in the cold worked condition is covered by ISO 16143-3, Stainless steels for general purposes – Part 3: Wire.

NOTE 6 Corrosion resistant stainless steels for which resistance to corrosion is of primary importance are covered by ISO 16143-1, Stainless steels for general purposes – Part 1: Corrosion resistant flat products, ISO 16143-2, Stainless steels for general purposes – Part 2: Corrosion resistant semi-finished products, bars, rods and sections

NOTE 7 Heat-resistant steels for valves are covered by ISO 683-15:1992, Heat treatable steels, alloy steels and free-cutting steels – Part 15: Valve steels for internal combustion engines.

In addition to this International Standard, the general technical delivery requirements of ISO 404 are applicable.