TU 2730.09.034-2012 extract

Extract from TU 2730.09.034-2012

These technical conditions apply to tape of the following grades: Sv-07Kh25N13, Sv-04Kh20N10G2B (EP762), Sv-02Kh21N11G2B, Sv-02Kh24N13G2B, Sv-03Kh22N11G2B, Sv-03Kh24N13G2B, manufactured from corrosion-resistant steels and intended for anti-corrosion surfacing of equipment and pipelines of nuclear power plants.

It is permitted to use tape according to these specifications for the manufacture of products in other industries (metallurgy, energy, petrochemistry, etc.).

The strip can be made from: steel smelted in an open furnace; steel smelted in an open furnace with subsequent vacuum-arc remelting (marked with the letters "VD"); steel smelted in a vacuum-induction furnace (marked with the letters "VI").

The smelting method is specified in the order.

Steel smelting for the production of strip must be carried out using clean charge materials.

The tape must be supplied in batches. A tape batch is a tape of one brand, one heat, one delivery condition, one standard size and one surface quality.

The tape can be supplied in a semi-hardened delivery condition (index in the designation "PN") and a hardened delivery condition (index in the designation "N").

The tape is supplied with surface quality according to GOST 4986-2B.

1 TECHNICAL REQUIREMENTS

1.1 The tape is supplied in rolls of dimensions and weights in accordance with the values given in Table 1.

Table 1 - Tape dimensions and tape roll weights

Tape thickness, mm	0.5 -0.05					0.7 -0.05
Tape width, mm	20 -0.4	30 -0.4	60 -0.4	90 -0.4	120 -0.4	25 -0.4	50 -0.4	75 -0.4	100 -0.4
Weight of tape in roll, kg	not less than
	12	25	25	25	25	25	25	25	25

Note: At customer's request, tape with a different roll weight can be supplied.

1.2 The tape is supplied with cut edges.

1.3 The tape must be supplied in rolls. A roll may consist of several sections. The length of a section of tape in a roll must be at least 30 m. The internal diameter of the rolls must be at least 300 mm and no more than 515 mm.

1.4 The tape must be made of steel, the chemical composition of which is given in Table 2.

1.5 The mechanical properties of the tape must correspond to the values given in Table 3.

Table 3 - Mechanical properties of the tape

Tape brand	Delivery status	Ultimate tensile strength (σ in ), N/mm² (kgf/mm²)	Relative elongation (δ 50 ), % not less than
Sv-07X25N13, Sv-04Х20Н10Г2Б (EP762), Sv-02X21N11G2B, Sv-02X24N13G2B, Sv-03X22N11G2B, Sv-03X24N13G2B	Worked	1000±100 (102±10)	12
	Semi-hardened	780±100 (80±10)	15

Note:

1 The delivery status of the tape is determined by the customer;

2 Standards for relative elongation are optional;

3 It is permissible, by agreement with the customer, to set the mechanical properties for the work-hardened tape in terms of tensile strength (σ _in ) within the range of 1150±00 (117±10) N/mm² (kgf/mm²), and in terms of relative elongation not less than 6%.

1.6 Steels intended for the production of tape must be resistant to intercrystalline corrosion.

Table 2 - Chemical composition of steel for the production of tapes

Steel grade	Mass fraction of elements, %
	Carbon	Silicon	Manganese	Chromium	Nickel	Molybdenum	Niobium
Sv-07X25N13	0.04 - 0.07	0.50 - 0.80	1.00 - 1.80	24.00 - 26.00	12.00 - 14.00	no more than 0.25	no more than 0.05
Sv-04Х20Н10Г2Б (EP762)	no more than 0.04	0.20 - 0.45	1.80 - 2.20	18.00 - 20.50	9.00 - 10.50	no more than 0.25	0.90 - 1.10
Sv-02X21N11G2B	no more than 0.025	no more than 0.30	1.50 - 2.00	20.50 - 22.00	10.00 - 11.50	no more than 0.25	0.60 - 0.80
Sv-02X24N13G2B	no more than 0.025	no more than 0.30	1.50 - 2.00	23.00 - 25.00	12.00 - 14.00	no more than 0.25	0.60 - 0.80
Sv-03X22N11G2B	no more than 0.030	no more than 0.30	1.50 - 2.00	22.00 - 23.50	10.00 - 11.50	no more than 0.25	0.70 - 0.90
Sv-03X24N13G2B	no more than 0.030	no more than 0.30	1.50 - 2.00	23.00 - 25.00	12.00 - 14.00	no more than 0.25	0.70 - 0.90

Continuation of table 2

Steel grade				Mass fraction of elements, %
				Nitrogen		Sulfur	Phosphorus		Copper		Lead	Tin	Antimony	Arsenic	Cobalt	Aluminum		Oxygen
				no more
Sv-07X25N13				0.05		0,010	0,018		0.06		0,001	0.005	0.005	0.005	0.03	0.10		0.03
Sv-04Х20Н10Г2Б (EP762)				0.05		0,010	0,018		0.06		0,001	0.005	0.005	0.005	0.03	0.10		0.03
Sv-02X21N11G2B				0.05		0,010	0,018		0.06		0,001	0.005	0.005	0.005	0.03	0.10		0.03
Sv-02X24N13G2B				0.05		0,010	0,018		0.06		0,001	0.005	0.005	0.005	0.03	0.10		0.03
Sv-03X22N11G2B				0.05		0,010	0,018		0.06		0,001	0.005	0.005	0.005	0.03	0.10		0.03
Sv-03X24N13G2B				0.05		0,010	0,018		0.06		0,001	0.005	0.005	0.005	0.03	0.10		0.03
Notes:			1 The oxygen content requirement is optional, the oxygen content is determined and recorded in the quality document. 2 Limit deviations for the mass fraction of elements in accordance with Table 3 of GOST 2246. 3 For steel grade Sv-04Kh20N10G2B (EP762), the maximum deviations in the mass fraction of carbon are allowed to be plus 0.005%.
Change	Sheet	Doc. No.			Signature			Date

Inv. No.	Sub. and date	Exchange inv. No.	Inv. No. duplicate.	Sub. and date

1.7 The content of the ferrite phase in the steel must correspond to the values given in Table 4.

Table 4 - Content of ferrite phase in steel

Steel grade	Ferrite phase content, %
Sv-07X25N13	5-8
Sv-04Х20Н10Г2Б (EP762)	5-8
Sv-02X21N11G2B	5-8
Sv-02X24N13G2B	5-8
Sv-03X22N11G2B	5-8
Sv-03X24N13G2B	5-8

1.8 Surface quality of the tape according to GOST 4986 - 2B. Minor traces of abrasive cleaning are allowed.

1.9 The edges of the tape must not have cracks, nicks, tears or delamination; burrs of a size not exceeding the maximum deviation in tape thickness are allowed. The edges of the tape must not be bent (deformed).

1.10 The tape crescent shape must not exceed 2 mm over a 1 m long section. The tape flatness must not exceed 25 mm over a 1 m long section.

At the customer's request, the tape flatness should not exceed 5 mm over a 1 m long section.

1.11 Delamination in the tape is not allowed.

1.12 By agreement of the parties, the tape is supplied with a polished surface.

1.13 It is allowed to enlarge rolls of tape by welding separate blanks of the same heat. The blanks are connected end-to-end by argon-arc welding with a non-consumable electrode without filler. The weld seam must not have through defects in the form of cracks, lack of fusion, or burn-through. Welding of blanks is performed when their thickness is not less than 2.0 mm.

1.14 At the customer's request, the order (specification) specifies the mass of a batch of tape from one heat.

1.15 Each batch of tape supplied to the customer must be accompanied by a quality document (certificate) containing the following information:

- name of the manufacturer, if any, its trademark;

- name of the consumer (customer);

- name of product;

- date of issue of the quality document (certificate);

- tape brand;

- size (thickness and width of the tape);

- surface roughness;

- batch number and tape melt number;

- number of places, total weight of tape in the batch;

- test results (actual chemical composition, including gas content, ferrite phase content, mechanical properties of the tape);

- the number of the agreement (contract) with the consumer under which this batch of tape is supplied.

The quality document (certificate) must be certified by the signature of the responsible person and the stamp (seal) of the technical control service of the manufacturer, indicating the date of issue of the quality document (certificate).

1.16 The tape is wound into rolls. The tape must be wound tightly into rolls. The rolls must be tied with circular or at least three radial straps, the strapping material being austenitic steel or plastic packaging tape.

1.17 The following information must be applied to both ends of each roll of tape:

- tape brand;

- TU number;

- melt number;

- batch number;

- thickness and width of the tape;

- roll weight.

The information must be applied in any way that ensures its safety during transportation and storage of the tape.

Similar information must be applied to each packaging unit.

1.18 Each roll of tape must be provided with a stainless steel tag indicating the data specified in paragraph 1.17.

1.19 Each roll of tape is wrapped in waterproof paper (film) and packed in wooden boxes, ensuring the safety of the tape. The rolls are placed in boxes in such a way as to prevent their movement inside the box. The weight of boxes with tape is no more than 1000 kg. Other types of packaging, ensuring reliable protection of each roll of tape from moisture and dirt, are allowed by agreement between the manufacturer and the consumer.

2 ACCEPTANCE RULES

2.1 The tape is accepted in batches. A batch must consist of metal from one melt, one delivery condition. Each batch must be accompanied by a quality document (certificate).

2.2 The thickness, width and shape of the tape are checked on each roll.

2.3 To check the quality of the tape, samples are taken from the batch:

- to determine the chemical composition - according to GOST 7565;

- to determine gas content - according to GOST 4986;

- for tensile testing and determination of surface quality - according to GOST 4986;

- for testing for intercrystalline corrosion - according to GOST 4986. Tests for resistance to intercrystalline corrosion may be carried out in an intermediate workpiece.

2.4 The content of the ferrite phase is determined from a cast ladle sample taken before pouring, or obtained by remelting the strip with a non-consumable tungsten electrode in an argon environment into a copper cooled chill mold using the volumetric magnetic method in accordance with GOST 2246.

2.5 If unsatisfactory test results are obtained for at least one of the indicators, repeat tests are carried out on it using a sample selected in accordance with GOST 7566.

2.6 The results of the re-check are final and apply to the entire batch of tape.

2.7 Upon agreement of the parties, the tape may be subjected to additional tests (assessment of welding and technological, physical and mechanical properties, and other consumer qualities). The methodology for assessing welding and technological, physical and mechanical properties, requirements and standards for quality assessment (agreed upon with the developer of these TU) must be provided by the customer.

3 CONTROL METHODS

3.1 The tape thickness is measured with a micrometer according to GOST 6507, accuracy class 2 (error 0.005 mm), the tape width is measured with a caliper according to GOST 166, accuracy class 1 (error 0.05 mm). The tape thickness is measured at a distance of at least 5 mm from the edge.

3.2 Non-flatness and camber are checked on any section of the tape when unwinding the roll. Non-flatness is determined on a control flat plate by measuring the maximum height of deviation of the tape from the plate. When checking the tape for camber, the section of the tape being checked is placed on a flat surface and a 1 m long ruler is applied to the concave side of the tape, after which the distance of the most distant point of the tape arc from the ruler is determined.

3.3 Determination of the chemical composition of samples according to paragraph 2.3. is carried out according to GOST 12344, GOST 12345, GOST 12346, GOST 12347, GOST 12348, GOST 12350, GOST 12352, GOST 12353, GOST 12355, GOST 12357, GOST 12358, GOST 12361, GOST 12362.

3.4 By agreement with the consumer and the developer of these TU, it is permitted to use other methods (GOST 28033, GOST 18895, etc.) that ensure the required accuracy of determining the content of chemical elements. In case of disagreement, the chemical composition of samples is determined by a chemical method.

Determination of gas content (nitrogen, oxygen) is carried out according to GOST 17745 or other methods that ensure the required accuracy.

3.5 Tensile tests of the tape are carried out in accordance with GOST 11701. Mechanical properties are determined on samples cut along the rolling direction.

3.6 Surface roughness is checked using profilometers, profilographs, optical instruments or working samples.

3.7 Testing of control samples selected according to clause 2.4 to determine the content of the ferrite phase is carried out according to the methodology of GOST 2246.

It is permissible to determine the content of the ferrite phase (CFP) by another method according to the manufacturer's methodology, agreed upon with the developer of these TU.

4 TRANSPORTATION AND STORAGE

4.1 The tape may be transported by all types of transport in covered vehicles in accordance with the rules for the carriage of goods applicable to this type of transport. The transport packaging must be provided with the handling sign "Afraid of dampness".

4.2 By agreement of the parties, it is permitted to transport the tape in open vehicles, including universal medium-tonnage containers, provided that the tape is reliably protected from the effects of precipitation and the duration of its transportation from the manufacturer to the consumer does not exceed 24 hours (including loading and unloading operations).

4.3 The packaged tape should be stored and transported under conditions that prevent contamination and damage to the packaging.

4.4 The tape must be stored in a dry room at a temperature of 15 to 35°C in the absence of alkaline, acidic or other aggressive impurities in the air.