GOST 800-78. Bearing Tubes

Outside Diameter: Hot-formed 70 - 160 mm, Cold-formed 20 - 83 mm Wall Thickness: Hot-formed 7 - 26,6 mm, Cold-formed 3 - 15 mm Notes: Hot-formed pipes are produced from stainless steel grades SchCh15, SchCh15SG and their modifications, with contour turning of the external surface. Cold-formed pipes are produced from stainless steel grades SchCh15, SchCh15SG and their modifications, without contour turning. OD and WT are subject to agreement. The depth of decarbonized layer shall be determined by the Customer.

Tubes Sizes
Sizes, mm		OD/WT	OD/WT Tolerances, %	OD Tolerances., mm	Length, m
Outside Diameter	Wall Thickness
Hot-formed
70 - 160	7 - 26,6	< 11	+ 15	+ 0,2	2 - 5
		11 .. 12,5.	+ 20
		> 12.5	+ 25
Cold-formed
20 - 83	3 - 15	-	-	+ 0,4 (D 14 - 60 mm) + 0,5 (D 60 - 90)	2,5 - 4,5

Mechanical properties
Steel Grade	Method of producing	Brinell hardness, НВ	Diametr of Dent, mm
SchCh15, SchCh15SG	Hot-formed	207 - 187	4,4 - 4,1
	Cold-formed, heat-treated	255 - 207	4,2 - 3,8
	cold-formed, without heat-treatment	max 320	min 3,4

Chemical Composition (%, max)
Steel Grade	C	Si	Mn	Cr	Ni	S	P	Cu
SchCh15	0,95-1,05	0,17-0,37	0,2-0,4	1,3-1,65	0,3	0,02	0,027	0,25
SchCh15SG	0,95-1,05	0,40-0,65	0,9-1,2	1,3-1,65	0,30	0,02	0,027	0,25