Steel 50РА (50P)

Designation

Name	The value
Designation GOST Cyrillic	50РА
Designation GOST Latin	50PA
Transliteration	50RA
By chemical elements	50B

Name	The value
Designation GOST Cyrillic	50Р
Designation GOST Latin	50P
Transliteration	50R
By chemical elements	50B

Description

50РА steel is used: for the production of slabs for the manufacture of tape, the flat springs for various purposes.

Note

Steel spring alloy of high quality.

Standards

Name	Code	Standards
Sheets and strips	В23	GOST 14918-80
Bars and shapes	В32	GOST В 5160-89, TU 14-1-1271-75
Tape	В34	TU 14-1-2687-79, TU 14-1-2992-80
Blanks. Of the workpiece. Slabs	В31	TU 14-1-2782-79

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	B
TU 14-1-2687-79	0.49-0.55	≤0.01	≤0.02	0.5-0.8	0.1-0.3	0.17-0.37	≤0.3	Rest	-	≥0.001
TU 14-1-2782-79	0.49-0.55	≤0.012	≤0.016	0.5-0.8	0.1-0.3	0.17-0.37	≤0.3	Rest	≤0.25	≤0.0045

Fe is the basis.
According to TU 14-1-2687-79 the chemical composition is given for steel grade 50RA.
According to TU 14-1-2782-79, the chemical composition is given for steel grade 50RA, smelted in open electric arc furnaces. In the steel, deviations in chemical composition are allowed: in carbon ± 0.010%, in silicon ± 0.020%, in manganese ± 0.020%, in sulfur ± 0.0030%, in phosphorus ± 0.0030%, provided that the total mass fraction of sulfur and phosphorus will not be more than 0.0280%. Boron is introduced according to the calculation without fumes in an amount not exceeding 0.0045%, while the residual content in the steel should not be less than 0.0010%.