Execution standards

Note: On agreement between parties, other pipes can be manufactured in the dimensional range:
- diameter (219,1 - 1626) mm;
- wall thickness (4,8 - 12,5) mm;
as well as of other equivalent steel grades, too.

QUALITY TECHNICAL CONDITIONS ACCORDING TO SR 6898-2

1. Pipe category

S with welding quality factor s=1,0

O with welding quality factor s=0,9

2. Dimensions and linear weights according to SR 11082 (Tabel 1.1)

Outside diameter mm (in)	Wall thickness , mm (in)
	4,80	5,20	5,60	6,40	7,10	7,90	8,70	9,50	10,30	11,10	11,90
	0,188	0,203	0,219	0,250	0,281	0,312	0,344	0,375	0,406	0,438	0,469
	Linear weight (Kg/ml)
219,1 (8 5/8)	25,37	27,43	29,48	33,57	37,12	41,14	-	-	-	-	-
273,1 (10 9/4)	31,76	34,35	36,94	42,09	46,57	51,67	-	-	-	-	-
323,9 (12 3/4)	-	40,87	43,96	50,11	55,47	61,56	67,62	-	-	-	-
355,6 (14)	-	44,93	48,33	55,11	61,02	67,74	74,42	-	-	-	-
406,4 (16)	-	51,45	55,35	63,13	69,91	77,63	85,32	92,98	100,61	108,20	115,77
457,0 (18)	-	-	62,34	71,12	78,77	87,49	96,18	104,84	113,46	122,05	130,62
508,0 (20)	-	-	69,38	79,16	87,70	97,43	107,12	116,78	126,41	136,01	145,58
610,0 (24)	-	-	-	95,26	105,56	117,30	129,00	140,68	152,32	163,93	175,51
711,0 (28)	-	-	-	111,20	123,24	136,97	150,67	164,34	177,98	191,58	205,15
813,0 (32)	-	-	-	-	141,10	156,84	172,56	188,24	203,88	219,50	235,09
914,0 (36)	-	-	-	-	158,79	176,52	194,22	211,90	229,54	247,15	264,72
1016,0 (40)	-	-	-	-	-	196,39	216,11	235,79	255,45	275,07	294,66
1118,0 (44)	-	-	-	-	-	-	-	259,69	281,35	302,99	324,59
1219,0 (48)	-	-	-	-	-	-	-	283,35	307,01	330,63	354,23
1422,0 (56)	-	-	-	-	-	-	-	330,91	358,57	386,20	413,80
1626,0 (64)	-	-	-	-	-	-	-	-	410,38	442,04	473,66

3. Tolerances

3.1 Outside diameter
diameter <= 508 mm	+/- 0,75%
diameter > 508 mm	+/- 1%
3.2 Wall thickness	+ 12,00% - 8,00%

4. Lenghts

- random lenghts	6 - 12,5 m
- fixed lenghts within manufacture lenghts range

5. Chemical requirements for liquid steel - %

Steel grade	C max.	Mn max.	P max.	S max.	Si max.
OL 37.2	0,18	0,80	0,050	0,050	0,40
OL 42.2	0,25	0,80	0,050	0,050	0,40
OL 44.2	0,20	1,10	0,050	0,050	0,50
OL 52.2	0,20	1,60	0,050	0,050	0,50

6. Mechanical requirements

6.1 Mechanical requirements of the base metal
Steel grade	Tensile strenght Rm, min., N/mm2	Yield limit Rp 0,2, N/mm2 min.	Elongation % min.	Impact testing at 20 Celsius degrees KCU 300/2, J/mm2, min.
OL 37.2	360	240	25	69
OL 42.2	410	260	22	69
OL 44.2	430	280	22	59
OL 52.2	510	350	21	59

6.2 Hot yield limit for the base material
Steel grade	Temperature (Celsius degrees)
	100	150	200	250	300	350	400
	Yield limit, min, Rp 0,2, N/mm2
OL 37.2	205	185	165	145	115	95	80
OL 42.2	235	215	190	175	145	125	110
OL 44.2	245	225	205	185	155	135	120
OL 52.2	295	275	255	235	215	195	165

7. Hydrostatic test pressure (bar)
- according to SR 1111
- each pipe must resist for 10 s.

8. Other quality checks

- non-destructive TVX checks along the lenght of welded seam up to 102 mm from the ends. The end zone and the repaired ones are XR and / or US checked;
- tensile testing of base material;
- bend testing of base material;
- impact bend testing of base material at 20 Celsius deg.;
- tensile testing of seam;
- bend testing of seam;
- impact bend testing of seam at 20 Celsius deg.;
- checking of chemical analysis on pipe (at customer's choice).

Protection, marking, documents, delivery

- the pipes are delivered unprotected;
- the pipes are delivered with bevelled ends to an angle of 30 degrees +/- 5 degrees, keeping a front ring of 1.60 +/- 0,80 mm;
- each pipe will be marked - stencilled and painted at about 300 mm from one of the ends;
- each lot of pipes will be accompanied by the mill test certificate according to EN 10204/DIN 50049;
- the delivery will be made by railway, truck or ship.

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