Non-alloy carbon steel

Section

• construction non-alloy steels, machine steels for thermal improvement and carburizing (C10E, C15E, C35E, C45E, C60E)
• steel for pressure equipment (P245GH, P280GH, P305GH, P295GH),
• fine-grained steels,
• spring steels (C55S, C67S, C75S, C85S, C90S, C100S, C125S),
• automated steels (11SMnPb37, 11SMn30)
• low carbon steel for cold forming (DC01, DC03, DC04, DC05, DC06, DC07),
• hot-dip galvanized steels, or with other surfaces.

Chemical composition

Unlike ordinary steels, non-alloyed steels are "cleaner" in terms of sulfur and phosphorus content in the chemical composition, although they are deliberately over-inflated (for example, to facilitate machining). Cutting is also facilitated by the addition of lead - Pb in the chemical composition.

It should also be added that a large proportion of these materials are present, and may be present in standardized annealing or after standardizing rolling conditions. Some of them are small in size or approved for alloying additives (eg. silicon, copper, chromium, nickel), improving properties or heat treatment of materials.

They do not have an extremely significant effect on the characteristics and properties of the material (as in alloyed steels and high alloyed steels), but have been included in the standards, and in the manufacture of components on a larger scale facilitate the fabrication of the material for a specific purpose. The main constituents of non-alloy steel besides iron are manganese and carbon.

Standards

The above described groups of steel define the Polish standards PN-75/H-84019, PN-88/H-84020, PN-63/H-84021, PN-H-84023 and EN 10083, EN 10025, EN 10087 according to which are provided:

• Cold-rolled strips for cold pressing, spring, for heat treatment according to PN-73/H-92326, PN-EN-13247, PN-93/H-92329, PN-EN 10132-3, PN-EN 10132-4, PN-77/H-92330, PN-74/H-92329, PN-87/H-92143, PN-EN 10131, PN-EN 10130; PN-EN 10139
• Carbon sheets, spring for heat treatment, cold rolled according to PN-81/H-92129, PN-EN 10132-4, PN-EN 10131
• Carbon spring plates, for heat improvement, hot-rolled according to PN-81/H-92121, PN-EN 10130+A1, PN-94/H-9220, and PN-EN 10029
• Carbon seamless tubes for thermal improvement according to ГОСТ 8731-74, PN-EN 10216-1, PN-EN 10217-1, PN-EN 10216-2, PN-EN 10217-2, PN-EN 10216-4, PN-EN 10217-4
• Bars for pressure equipment for operation at elevated temperatures according to PN-85/H-93001, PN-85/H-93210, PN-86/H-93209, PN-EN 10278, PN-87/H-93200, and PN-EN 10060, PN-EN 10277, EN 10016
• Carbon flat bars and square bars for thermal improvement according to PN-73/H-84026
• Forgings for pressure equipment, for working at elevated temperatures according to PN-79/H-94500, PN-61/H-94009, PN-EN 10222-2