TU 14-1-4461-88 (replaces TU 14-1-711-73)

OKP 09 8100 09 9100 APPROVED: in the prescribed manner «11» 07 1988 AGREED: in the prescribed manner with interested or- organizations and State Acceptance «24» 05 1988 Right: signature and seal

UDC 669.14-413 Group B 33

STRUCTURAL SHEET METAL

ALLOYED HIGH STRENGTH

TECHNICAL SPECIFICATIONS

TU 14-1-4461-88

(replaces TU 14-1-711-73)

Holder of the original - TsNIIChM

Letter A

No. 2888427 dated 11/88/09

Validity period:

005/016538

22.07.88

TU 14-1-4461-88 C.2

These technical conditions apply to the supply of hot-rolled and cold-rolled sheets made of high-strength structural alloy steel grades VKS-1, VL-1D, VP-25, VP-30, SP-28, SP-33, SP-38, SP-43.

Examples of symbols:

Sheet metal products of normal flatness (PN), dimensions 20x1250x6000 according to GOST 19903-74, made of steel grade SP-38.

Sheet

Thin-sheet cold-rolled steel of normal flatness (PN), dimensions 2x1250x4000 according to GOST 19904-74, made of steel grade VL-1D.

Sheet

1. ASSORTMENT

1.1. The maximum dimensions of the sheets produced are given in Table 1. The specific dimensions of the sheets are specified in the order.

Table 1

Steel grade	Type of leaf	Dimensions, mm
		thickness	width	length
VKS-1, VL-1D VP-25, VP-30 SP-28	cold rolled hot rolled	0.8-5.0 3.2-20.0	up to 2200 up to 2500	up to 4000 up to 6000
SP-33, SP-38 SP-43	hot rolled	5.7-20.0	up to 2500	up to 6000

1.1.1. Sheets of steel grades VP-25, VP-30 and SP-28 with a thickness of 0.8-5.6 mm are supplied only upon orders from MAP enterprises.

1.1.2. It is permitted to supply sheets of the Pa form for each standard size specified in the order - in a quantity of no more than 5% with

TU 14-1-4461-88 C.3

shipped in one pack together with a batch of sheets.

1.1.3. The specific range is agreed upon by the parties when placing an order in accordance with the specialization of the mills.

1.2. The maximum deviations in sheet sizes must correspond to:

- by thickness

- cold rolled sheets - - GOST 19904-74, group B, - hot rolled sheets thickness up to 3.9 mm and above 10 mm - - GOST 19903-74, group B, thickness from 4.0 to 10.0 mm - GOST 11269-76;

- in width - no more than + 20 mm;

- in length - no more than + 50 mm.

Note: At the customer's request, it is permitted to supply sheets with accuracy class A according to GOST 19903-74, GOST 19904-74.

2. TECHNICAL REQUIREMENTS

2.1. The chemical composition of steel must comply with the standards specified in Table 2 (Appendix 1), sent upon request.

2.1.1. The sulfur and phosphorus content for all grades must be:

sulfur - no more than 0.011%;

phosphorus - no more than 0.015%; while the total content of sulfur and phosphorus should be no more than 0.022%.

2.1.2. The residual copper content must not exceed 0.15%. With the consumer's consent, up to 0.20% is permitted.

2.1.3. In steel grades VP-25 and VP-30, the residual molybdenum content is allowed to be up to 0.1%.

2.1.4. The following deviations in chemical composition from the standards specified in Table 2 are allowed in finished sheets:

carbon: + 0.02% - 0.01%; ± 0.05

tungsten ± 0.10% molybdenum ± 0.03% vanadium + 0.02%

TU 14-1-4461-88 P.4

For sheets made of VL-1D steel, deviations in carbon content are ± 0.01%.

2.1.5. In steel grades VL-1D, VP-25, VP-30, SP-28, SP-33, SP-38 and SP-43, partial or complete replacement of tungsten with molybdenum is permitted at the rate of 2.5 mass fractions of tungsten replaced by one mass fraction of molybdenum.

2.1.6. At the customer's request, specified in the order, sheets of steel grades VKS-1 and VL-1D are supplied from electroslag remelted metal, with the letter "Ш" added to the name of the steel grade (VKS-1Ш, VL-1ДШ).

The content of sulfur in steel grades VKS-1Sh and VL-1DSh is no more than 0.006%, phosphorus is no more than 0.015%, with a total content of sulfur and phosphorus of no more than 0.020%.

2.2. Sheets are supplied in an annealed condition with an etched surface, straightened, with cut edges, and oiled on both sides with neutral oil.

2.3. The hardness of sheets in the delivered condition must comply with the standards in Table 3.

Table 3

Steel grade	Brinell hardness, diameter, mm	Rockwell hardness		Hardness, HRC
		HRC	HRB
	not less than	no more
VP-25, VP-30 SP-28, SP-33 SP-38 VKS-1, VL-1DSP-43	3.9 3.8 3.7	24 26 29	101 103 104		26 28 31

2.4. The mechanical properties of the sheets, determined on three heat-treated control samples cut across the direction of hot rolling, must satisfy the requirements of Table 4.

TU 14-1-4461-88 C.5

Table 4

Steel grade		Heat treatment mode for control samples	Mechanical properties
			Ultimate strength, σ in , N/mm 2 (kgf/mm 2 )	Relative elongation, δ 5 , %
			not less than
VKS-1		Quenching 940±10°C, air cooling, tempering at 200-280 °C, air	1860 (190)	7
VL-1D		Quenching 940±10°C, air cooling tempering at 200-280°C, air	1570 (160)	7
VP-25 VP30		Hardening 910-940°C, oil cooled, tempering at 300-380°C, air cooled	1420 (145) 1520 (155)	7.5 7
SP-28, SP-33, SP-38, SP-43		Hardening 930-980°C, air cooled (or in oil), vacation at 280-360°C, in air	1570 (160) 1670 (170) 1770 (180) 1860 (190)	7 7 7 6
Notes:	1. The mechanical properties for VKS-1 grade steel specified in Table 4 are determined as the arithmetic mean of tests of at least three samples, with individual samples being allowed to have drops in tensile strength of 49 N/ mm2 (5 kgf/ mm2 ) and in elongation of 1% (absolute). 2. For cold-rolled sheets made of steel grades VP-25, VP-30 and SP-28 with a thickness of 0.8-1.5 mm, a reduction in the standards of ultimate strength by 100 N/mm² (10 kgf/mm²) is allowed, and for a thickness of 1.6-2.5 mm - by 50 N/mm² (5 kgf/mm²). For cold-rolled sheets made of steel grade VKS-1 with a thickness of 2.5 mm and less, a reduction in the standards of ultimate strength by 50 N/mm² (5 kgf/mm²) is allowed. 3. With the consent of the customer, for steel grades VL-1D and VKS-1, individual small deviations in the heat treatment mode of samples and from the specified mechanical testing standards are allowed, provided that all other requirements of the technical specifications are met. 4. Heating of samples for hardening is carried out under conditions excluding decarburization and carburization. The hardening environment "air" or "oil" for steel grades SP-28, SP-33, SP-38, SP-43 is specified in the order. If the environment is not specified in the order, hardening of samples is carried out in air. Cooling of samples during air hardening is allowed to be carried out by fan blowing.

2.5. The surface quality of the sheets must meet the following requirements:

for thin sheets - GOST 11268-76, except for sheets with a polished surface;

for thick sheets - GOST 11269-76.

It is permissible to grind sheets in order to remove surface defects to a depth that does not take the sheet beyond the minimum thickness.

2.6. The non-flatness of sheets should not exceed per 1 m of length:

for cold-rolled sheets - 10 mm, hot-rolled sheets - 12 mm.

In this case, up to 15% of sheets with increased non-flatness are allowed for each batch:

cold rolled - up to 20 mm,

hot rolled - up to 25 mm.

Sheets with increased non-flatness are marked specially.

Note.

For sheets rolled on sheet rolling mills, the flatness standards should be no more than: cold-rolled sheets - up to 20 mm and 15% up to 30 mm; hot-rolled sheets - up to 25 mm and 15% up to 35 mm.

The manufacturer is permitted to supply sheet metal products with non-flatness in accordance with GOST 19903-74, GOST 19904-74.

2.7. The carbon content of finished sheets must be checked, and must comply with the standards given in Appendix 1, taking into account the requirements of paragraph 2.1.4.

2.8. Sheets are subject to control for surface decarburization. The depth of the general decarburization zone (complete decarburization plus partial) should be no more than 2% on each side of the actual sheet thickness.

TU 14-1-4461-88 P.7

Carbonization of the sheet surface is not permitted.

2.9. At the customer's request, ultrasonic testing (UT) of sheets is performed to detect internal defects. The testing methods and standards for acceptable defects are established by agreement of the parties.

2.10. At the customer's request, cold-rolled sheet steel grade VL-1D with a standardized structure of granular pearlite is supplied.

The microstructure of granular perlite in sheets should not exceed score 4.

The actual microstructure grade is indicated in the quality document. The assessment of each batch of sheets for the dispersion of the microstructure of granular perlite is carried out according to GOST 8233-56 on 6 samples cut along the edges of 3 control sheets selected by the height of the pack (top, middle, bottom).

3. ACCEPTANCE RULES AND TEST METHODS

3.1. Sheets are presented for acceptance in batches of one melt, one thickness, one annealing batch.

Delivery together with a batch of 2 control sheets shorter than the nominal dimensions up to 50 mm is permitted.

3.2. To check the quality of sheet steel, one control sheet is selected from the middle of the batch. Samples are taken from this sheet to determine the hardness, mechanical properties, decarburization and carbon content in accordance with the scheme in Appendix 2.

3.3. Hardness determination is carried out:

- for a sheet thickness of 4.1 mm or more according to Brinell, a 10 mm ball GOST 9012-59 with the imprint diameter recorded in 0.05 mm increments using a measuring device with the smallest division value of 0.05 mm;

- for sheet thickness of 1.5-4.0 mm according to Rockwell scale "C" GOST 9013-59.

If the hardness is less than 20 HRC units (22.5 HRC _e ), the documentation states: "Hardness less than 20 HRC (22.5 HRC _e )";

- for sheet thickness of 0.8-1.4 mm according to Rockwell scale "B" GOST 9013-59.

3.4. Surface decarburization control is carried out according to GOST 1763-68, method "M".

TU 14-1-4461-88 P.8

Surface carburization control is carried out according to the instructions (see Appendix 3).

It is permissible to control decarburization and carburization according to the supplier company's methodology.

In arbitration cases, control of decarburization and carburization must be carried out using the methods provided for in the TU.

3.5. Other acceptance rules and testing methods according to GOST 11268-76 for thin sheets and GOST 11269-76 for thick sheets.

4. MARKING, PACKAGING, DOCUMENTATION AND TRANSPORTATION

4.1. Packaging, marking, documentation and transportation of thin sheet steel according to GOST 11268-76, thick sheet steel - according to GOST 11269-76.

4.2. Maximum weight of packs:

cold-rolled sheets - up to 7 tons.

hot rolled sheets - up to 10 tons.

Note:

Prices for products are approved by the USSR State Price Committee and are published in price lists and appendices to them.

Registered: 14.07.88

Form 3.1A

Appendix 4 to TU 14-1-4461-88

(Required)

Name of the type of product according to NTD		Product type code according to VKG OKP
High-strength alloyed structural sheet metal		0 9   9 1 0 0
Blocks according to OKP	Designation according to NTD		OKP code
Steel grades	VKS-1 VL-1D		5368 5434
Profiles	THAT THAT		7180 7280
Technical requirements	TU 14-1-4461-88		5341
Order forms and delivery conditions	in packs		80

Calculation of codes checked:

Head of the Standardization Department Group

Central Research Institute of Human Microbiology L.M. Smirnova

PO "Vympel" UIM, 1979, No. 3263 - 1000

TU 14-1-4461-88 P.10

Appendix No. 2
TU 14-1-4461-88

SCHEME

sampling for control of sheet steel grades VKS-1, VL-1D, VP-25, VP-30, SP-28, SP-33, SP-38 and SP-43, supplied according to TU 14-1-4461-88

For testing, one control sheet from the middle of the stack is selected from each batch to test hardness, mechanical properties, decarburization, carbon content in the finished sheet, and possible carburization.

Samples are cut out according to the diagram:

Agreed:

TU 14-1-4461-88 P.11

Appendix No. 3
TU 14-1-4461-88

INSTRUCTIONS AND METHODS

for control of surface carburization of sheets

steel grades VKS-1, VL-1D, VP-25, VP-30, SP-28, SP-33,

SP-38 and SP-43, supplied according to TU 14-1-4461-88

1. Surface carburization is controlled by a chemical method. The carbon content is determined in a surface layer 0.2-0.3 mm thick by removing chips using a method that excludes the ingress of carbon-containing substances.

2. Sample No. 11 is subject to control for surface carburization only in those cases where the carbon content in the controlled sheets exceeds the ladle sample data by 0.02-0.03% depending on the steel grade according to Table 1. In all other cases, control for surface carburization is not carried out.

Table 1.

№№ p/p	Brand steel	Carbon content in ladle sample, %	The batches of sheets in which the carbon analysis showed an increase in the carbon content compared to the ladle sample by ...% are subject to control.
1	2	3	4
1. 2. 3. 4. 5. 6. 7. 8.	VKS-1 VL-1D VP-25 VP-30 SP-28 SP-33 SP-38 SP-43	Less than or equal to 0.40 Greater than or equal to 0.41 Less than or equal to 0.30 Greater than or equal to 0.31 Less than or equal to 0.25 Greater than or equal to 0.26 Less than or equal to 0.30 Greater than or equal to 0.31 Less than or equal to 0.28 Greater than or equal to 0.29 Less than or equal to 0.31 Greater than or equal to 0.32 Less than or equal to 0.36 Greater than or equal to 0.37 Less than or equal to 0.40 Greater than or equal to 0.41	0.03 0.02 0.03 0.02 0.03 0.02 0.03 0.02 0.03 0.02 0.03 0.02 0.03 0.02 0.03 0.02

TU 14-1-4461-88 P.12

3. If the carbon content in the surface layer is within the grade composition, taking into account the tolerances, the batch is considered suitable.

4. If the carbon content in the surface layer of the sample is higher than the upper limit, the batch of sheets is subject to repeated testing on a double number of samples from another (subsequent) sheet.

5. If unsatisfactory results of repeated testing are obtained, it is permitted to re-anneal the sheets of this batch, followed by a complete test for carbon (using the layer-by-layer analysis method), decarburization and mechanical properties in the same order as after the first annealing.

6. If unsatisfactory results of carburization testing are obtained after repeated annealing, the batch of sheets is rejected.

7. The following data is entered into the quality document:

ladle carbon content, sheet carbon content and layer-by-layer carbon content if such analysis was carried out.

Table for the pattern cutting scheme

№№ sample	Type of test	Delivery status	Place of cutting from control sheets	Number of samples
1	2	3	4	5
2.4.	To the depth of the decarburized layer	After annealing	Along the edge of the sheet	2
8	For hardness	After annealing	Along the edge of the sheet	1
6	For hardness	After annealing	In the middle of the sheet	1
1, 3, 5	For stretching	After hardening and tempering	Across the hot rolling direction	3
7, 9, 11	For tension spare	After hardening and tempering	Across the hot rolling direction	3
"WITH"	To determine carbon content	After annealing	Along the edge, half the width of the sheet	1
16	To the depth of the carburized layer by removing chips to a depth of 0.2-0.3 mm	After annealing	Across the rolling direction, along the edge of the sheet	1

TU 14-1-4461-88 P.13

Sample size

1. For decarburization 40x40 mm + 5.0 mm

- 2.0 mm

2. Tensile 35÷40х360 mm ± 5 mm

3. For hardness 35÷40x100 mm ± 5 mm

4. For carburization 40÷60х300 mm

5. For carbon content width 40 ± 5.0 mm