Steel seamless pipes for boilers and pipelines accoording
to TU 14-3-460-75 and cold-strained seamless pipes for boilers and
pipelines made from corrosion resistant steel grades according
to TU 14-3-796-79

Quality of steel

Steel grade	Chemical composition*, %
	Ñ	Si	Mn	Cr	Ni	Ti	Cu	S	P
							not more than
12Cr18Ni12Ti	up to 0,12	up to 0,8	0,98 - 2,02	17,0 - 19,0	10,9 - 13,0	(Ñ - 0,02) õ 5 - 0,70	0,3	0,02	0,035

* Contents of residue elements are in accordance with GOST 5632-72

Cold-strained pipe range (12Cr18Ni12Ti steel grade)
delivered according to TU 14-3-796-79 and TU 14-3-460-75

Outside diameter, mm	Wall thickness, mm												Outside diameter, mm
	2,0	2,5	3,0	3,5	4,0	4,5	5,0	5,5	6,0	6,5	7,0	8,0
	Mass of one linear meter, kg/lm
10	0,39	0,47											10
12	0,49	0,59	0,67										12
14	0,60	0,72											14
16	0,70	0,84	0,97										16
20		1,09	1,27	1,44	1,56								20
22		1,21	1,42	1,61	1,79								22
25		1,40	1,64	1,87	2,09	2,30	2,49						25
28		1,59	1,87	2,14	2,39	2,63	2,87						28
30			2,02	2,31	2,59	2,86	3,12	3,33					30
32			2,18	2,49	2,80	3,09	3,37	3,64	3,90	4,14	4,38	4,80	32
36			2,47	2,85	3,20	3,54	3,87	4,19	4,50	4,79	5,07	5,60	36
38			2,62	3,02	3,39	3,77	4,12	4,47	4,80	5,11	5,42	6,00	38
40			2,78	3,19	3,60	3,99	4,37	4,74	5,09	5,44	5,77	6,40	40
42			2,93	3,36	3,80	4,21	4,62	5,01	5,40	5,76	6,12	6,80	42
45			3,15	3,63	4,09	4,58	4,99						45
48			3,37	3,89	4,40	4,89	5,37						48
50			3,52	4,06	4,60	5,11	5,62						50
53			3,75	4,32	4,89	5,45	5,99						53
56			3,97	4,59	5,20	5,78	6,37						56
57			4,05	4,68	5,30	5,90	6,49						57
60			4,27	4,94	5,59	6,24	6,87						60
Outside diameter, mm	Mass of one linear meter, kg/lm												Outside diameter, mm
	2,0	2,5	3,0	3,5	4,0	4,5	5,0	5,5	6,0	6,5	7,0	8,0
	Wall thickness, mm

Note:
1. The whole assortment is in accordance with TU 14-3-796-79.
2. The assortment for TU 14-3-460-75 marked by the colour.
3. The maximum specific length is 12 m.

Admissible deviations acc. to TU 14-3-796-79

Outside diameter, mm	Tolerance	Wall thickness, mm	Tolerance, %
10 - 42	±0,25 mm	from 2 to 4	±10,0
over 42 - 60	±0,70%	over 4	±8,0

Admissible deviations acc. to TU 14-3-460-75

Process	Outside diameter	Admissible deviations
		in outside diameter
Cold-strained	up to 30 mm	±0,3 mm
	from 30 to 50 mm	±0,4 mm
	over 50 mm	±0,8 %
		in wall thickness
Cold-strained	all*	±10,0 %

Note:
1. Cold-strained pipes with the wall thicknesses more than 5 mm have the following tolerances: outside diameter is ±0,3 mm; wall thickness is ±8 %.
2. Producing of hot-strained pipes is in agreement with the manufacturer.

Technical requirements

Steel grade 12Cr18Ni12Ti	Longitudinal specimens				Brinnel hardness*, HB, not more	Heat treatment mode	Grain size, points	Pipe metal purity for non-metallic inclusions shall not be over,points
	ultimate rupture strength, MPa (kg-force/mm^2)	yield strength, Mpa (kg-force/mm^2)	relative elongation, % not less	area reduction, % not less
TU14-3-796-79	within		35	55	190	Austenization 1100 - 1200°Ñ Water or air cooling	Grain size difference of 3 to 7 within a view field is permitted	For sulphides - 3,0 For oxides and silicate - 3,5
	539 - 686 (55 - 70)	215 - 392 (22 - 40)
TU14-3-460-75	not less		35	55	200
	529 (54)	216 (22)

* Hardness is defined for tubes with wall thickness over 5 mm

Tests

Test method	Ultrasonic test	Grain size test	Inspection, measurement	Mechanical test	Flattening test	Flaring	Hydro test
the quantity of tested pipes in a lot*	100 %	100 %	100 %	2 %	2 %**	Customer request	guaranteed by the producing plant

* Lot size is not more than 200 pcs.
** Test is performed for pipes with diameter over 22 mm

Dla uzyskania pełnej informacji o ofercie prosimy o złożenie ZAPYTANIA.