Steel 90 (БП5)

Designation

Name	The value
Designation GOST Cyrillic	90
Designation GOST Latin	90
Transliteration	90
By chemical elements	90

Name	The value
Designation GOST Cyrillic	БП5
Designation GOST Latin	BP5
Transliteration	BP5
By chemical elements	NbP5

Description

Steel 90 applies: for the production of square rolled billets intended for rolling into wire rod and manufacturing of its wire.

Standards

Name	Code	Standards
Blanks. Of the workpiece. Slabs	В31	TU 14-1-1562-76, TU 14-1-3095-80

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu
TU 14-1-1562-76	0.88-0.92	≤0.018	≤0.011	0.3-0.6	≤0.05	0.25-0.37	≤0.05	Rest	≤0.05
TU 14-1-3095-80	0.88-0.93	≤0.015	≤0.015	0.3-0.6	≤0.05	0.2-0.37	≤0.05	Rest	≤0.05

Fe is the basis.
According to TU 14-1-3095-80 the chemical composition is presented for steel grade 90-Ш (БП5-Ш).
According to TU 14-1-1562-76, the chemical composition is presented for ingots of steel grade 90 (BP5) made of extremely pure metal smelted on the initial charge in open-hearth furnaces of the Beloretsk Metallurgical Combine. As a first-time blend, special pure iron from the Zigazino-Komarovskoye group of ores, charge mixture (ingots or liquid steel), smelted from pure iron, sponge iron, recycled scrap and rolled rubber, obtained by the production of extremely pure metal is used as the initial charge. Particularly pure steel for the purpose of reducing the content of sulfur, gases and non-metallic inclusions is carried out by out-of-furnace treatment with slag-forming mixtures with argon purge.

Technological properties

Name	The value
Macrostructure and pollution	In the metal billet according to TU 14-1-3095-80 content of nonmetallic inclusions should be (mean score / maximum score): - oxides (O) ≤ 2,0/3,0; - sulphides (S) ≤ 2,5/3,0; - silicates plastic (SP) ≤ 1,0/3,0; - silicates fragile (CX) ≤ 1,0/3,0; - silicates, non-deformed (SN) ≤ 2,0/3,0.