1.1. Extract from TU108.11.853-87
These technical conditions apply to blanks of parts from purchased rolled products for power engineering products.
These technical conditions do not apply to fasteners for products covered by the "Rules for the Design and Safe Operation of Equipment and Pipelines of Nuclear Power Plants" PN AE G-7-008-89.
These technical conditions have been drawn up taking into account the requirements of "Conditions 01-1874-62", "Rules for the design and safe operation of equipment and pipelines of nuclear power plants" PN AE G-7-008-89, "Special conditions for the supply of equipment, devices, materials and products for nuclear power facilities".
Examples of conventional designations when ordering:
A blank made of steel grade KhN35VTYu-VD, test group II, strength category KP 640, manufactured according to TU 108.11.853-87:
"KhN35VTYU-VD Gr.II KP 640 TU 108.11.853-87"
A blank made of steel grade KhN35VTYu-VD, test group I, hardness 285-363 HB, manufactured according to TU 108.11.853-87:
"ХН35ВТУ-ВД Gr.І 285-363 NV TU 108.11.853-87"
A blank made of steel grade ХН35ВТ, test group V, strength category KP 390, with ultrasonic testing standards according to class I:
"ХН35ВТ Gr.V KP 390 UZK Class. I TU 108.11.853-87"
Blank made of steel grade 20X13, test group U, strength category KP 440, with ultrasonic testing:
"20Х1З Gr.U KP 440 UZK TU 108.11.853-87"
1. TECHNICAL REQUIREMENTS
1.1. General requirements.
1.1.1. The blanks of the parts must comply with the requirements of these technical conditions and the manufacturer's drawings.
1.1.2. Purchased rolled products, depending on the steel grade, must be supplied to the manufacturer in accordance with Table 1.
1.2. Manufacturing requirements.
1.2.1. Depending on the requirements imposed on blanks of rolled parts, according to their operating conditions, and according to the type and scope of tests, blanks are divided into five test groups according to Table 2.
1.2.2. The assignment of a workpiece to a particular test group is carried out by the manufacturer's design bureau.
1.2.3. The blanks are subjected to heat treatment according to the manufacturer's modes, agreed upon with the materials science organization.
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Table 1
| Steel grade | Standard or specification, according to which the chemical composition is adopted |
Standard or technical conditions for the supply of rolled products | Delivery status |
| 14Х17Н2 | GOST 5632-72 | GOST 5949-75 | rods and strips |
| 11Х13Н3 | TU 14-1-2139-77 | TU 14-1-2139-77 | Same |
| ХН35ВТ (ЭИ 612) | TU 14-1-272-72 | TU 14-1-272-72 | -"- |
| 10Х11Н20Т3Р (ЭИ 696) | TU 14-1-1671-76, GOST 5632-72, TU 14-131-432-79 |
TU 14-1-1671-76, GOST 5949-75, TU 14-131-432-79 |
rods |
| KhN35VT-VD (EI 612-VD) | TU 14-1-1665-76 | TU 14-1-1665-76 | Same |
| 25Х17Н2Б-Ш | TU 14-1-1062-74 | TU 14-1-1062-74 | rods and strips |
| KhN35VTYu-VD (EI 787-VD) | TU 14-1-850-74, GOST 5632-72 | TU 14-1-850-74, TU 14-1-1589-76 | rods |
| 20X13 | GOST 5632-72 | GOST 5949-75 | Same |
| 30X13, 30X13-SH | GOST 5632-72 | GOST 5949-75 | -"- |
| 40X13 | GOST 5632-72 | GOST 5949-75 | -"- |
| 07Х16Н4Б, 07Х16Н4Б-Ш | TU 14-1-3573-83 | TU 14-1-3573-83 | -"- |
| 18Х13Н3 | TU 14-1-2139-77 | TU 14-1-2139-77 | rods and strips |
| 25X1MF | GOST 20072-74 | GOST 20072-74 | Same |
| 38ХН3МФА | GOST 4543-71 | GOST 4543-71 | -"- |
Notes:
1. The following grades of steel and alloys are permitted for use in the manufacture of NPP equipment parts covered by the "Rules for the Design and Safe Operation of NPP Equipment and Pipelines": 14Kh17N2, KhN35VT, KhN35VT-VD, 10Kh11N20T3R, 20Kh13, 30Kh13, 30Kh13-Sh, 07Kh16N4B, 07Kh16N4B-Sh, 25Kh1MF, 38KhN3MFA. Steel grade 38KhN3MFA is not used for welded parts.
2. The surface quality of the blanks must comply with the requirements of the technical documentation for the supply of this rolled product.
3. Blanks of parts manufactured from rolled products supplied according to TU 14-1-1671-76 and TU 14-131-432-79 may be used for NPP equipment only according to these technical specifications.
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Table 2
| Group of blanks | Types of tests | Scope of control tests after heat treatment | ||||
Hardness, % |
Mechanical properties | Ultrasonic testing (UZK) |
Testing for resistance to intercrystalline corrosion (ICC) | Control of non-metallic inclusions | ||
| I | 1. Determination of hardness. 2. Ultrasound inspection. 3. ICC. |
100 | are not checked | each workpiece on demand drawing |
one blank or one sample from a melt | - |
| II | 1. Testing mechanical properties at test temperature of 20 °C. 2. Determination of hardness. 3. Ultrasound inspection. 4. ICC. 5. Control of non-metallic inclusions. |
Same | two blanks or two samples from the party (with lower and upper values of hardness) |
Same | two blanks or two samples from the batch |
on one piece from the melt |
| III | 1. Testing mechanical properties at test temperature of 20 °C. 2. Testing mechanical properties at elevated test temperature. 3. Determination of hardness. 4. Ultrasound inspection. 5. ICC. 6. Control of non-metallic inclusions. |
" | Same | " | Same | Same |
| IV | 1. Testing mechanical properties at test temperature of 20 °C. 2. Determination of hardness. 3. Ultrasound inspection. 4. ICC. 5. Control of non-metallic inclusions. |
" | each blanks |
" | each workpiece | " |
| V | 1. Testing mechanical properties at test temperature of 20 °C. 2. Testing mechanical properties at elevated test temperature. 3. Determination of hardness. 4. Ultrasound inspection. 5. ICC. 6. Control of non-metallic inclusions. |
" | Same | " | Same | " |
Notes:
1. A batch consists of blanks from one melt that have undergone heat treatment together.
beginning of l 5a
2. Batches of groups II and III are assembled from blanks manufactured according to one drawing. It is allowed to combine blanks according to different drawings, differing in cross-section by no more than 25%, similar in configuration into a batch.
3. Blanks of parts made from rolled products with a diameter not exceeding 16 mm are subject only to hardness testing, regardless of the group. The hardness value is the acceptance value and is entered into the certificate.
4. Only blanks made of steel grades 14Kh17N2 (KP 490), 07Kh16N4B, 07Kh16N4B-Sh are subject to testing for resistance to MCQ.
5. For blanks of parts intended for equipment covered by the "Rules for the Design and Safe Operation of Equipment and Pipelines of Nuclear Power Plants", Group I is not applied; Groups II-V are applied, with Groups II and IV applied only for parts operating at temperatures not exceeding 100 °C.
6. For parts covered by the "Rules for the Design and Safe Operation of Nuclear Power Plants", 100% ultrasonic testing is performed, which is indicated in the drawing.
7. For workpieces of groups I, II, III, hardness is a passing characteristic.
For workpieces of groups II and III with high hardness (at least 33.5 HRCэ), heat-treated with an allowance for the configuration of the part and long workpieces (more than 2 meters), it is permissible to determine the mechanical properties on one workpiece or sample with hardness standards that are within the specified strength category for all workpieces in the batch.
8. For workpieces of groups IV and V, hardness is not a delivery characteristic, but is entered into the certificate.
1.2.4. The mechanical properties of the blanks of the parts after heat treatment must comply with the requirements of Table 3.
In case of stress relieving tempering after straightening, the tempering temperature should be:
for blanks made of steel grades 07Kh16N4B, 07Kh16N4B-Sh, 14Kh17N2, 18Kh13N3, 20Kh13, 30Kh13, 30Kh13-Sh, 40Kh13 - 20-30° below the main tempering temperature;
for blanks made of steel grades ХН35ВТ, ХН35ВТ-ВД, ХН35ВТЮ-ВД, 10Х11Н20Т3Р - correspond to the temperature of the main tempering (aging), if the duration of holding does not exceed 15% of the duration of the main aging.
In this case, testing of mechanical properties and determination of hardness after the specified tempering is not performed.
1.2.5. After heat treatment, blanks are subjected to ultrasonic testing in accordance with the requirements of Table 2, except for blanks with high hardness (at least 33.5 HRCэ), which are subjected to ultrasonic testing before heat treatment due to the fact that they are mechanically processed for heat treatment according to the configuration with an allowance of 0.5-3.0 mm for size.
1.2.5.1. Blanks of parts made of austenitic steels (ХН35ВТ, ХН35ВТ-ВД, ХН35ВТЮ-ВД, 10Х11Н20Т3Р), martensitic steels (07Х16Н4Б, 07Х16Н4Б-Ш) are considered suitable if they meet the following indicators:
defects with an equivalent area of S 0 mm2 or more are subject to fixation;
defects with an equivalent area greater than S 1 mm 2 are not allowed;
defects that, when tested with a direct transducer, cause a weakening of the bottom signal to a level of S 0 mm2 or lower are not allowed;
defects with an equivalent area from S 0 mm2 to S 1 mm2 inclusive are not allowed if they are assessed as extended;
Defects with an equivalent area from S 0 mm 2 to S 1 mm 2 inclusive are not allowed if their number per 100 mm of the length of the workpiece exceeds n 0 .
The minimum permissible distance between defects taken into account is 30 mm.
beginning l 7
Table 3
| Steel grade | Thickness of the original workpiece, mm |
Strength category, KP |
Mechanical properties at test temperature | Hardness | |||||||||
| 20 °C | 350 °C | according to Brinell | according to Rockwell | ||||||||||
Temporary tensile strength σ in , N/ mm2 (kgf/ mm2 ) |
Yield strength σ 0.2 , N/ mm2 (kgf/ mm2 ) |
Relative elongation δ 5 , % |
Relative narrowing Ψ, % |
Impact viscosity KCU, J/ cm2 (kgf m/cm 2 ) |
Temporary resistance break σ in , N/ mm2 (kgf/ mm2 ) |
Yield strength σ 0.2 , N/ mm2 (kgf/ mm2 ) |
Relative narrowing Ψ, % |
NV | Print diameter, mm | HRCэ | |||
| not less than | not less than | ||||||||||||
| 14Х17Н2 | up to 60 | KP 0 | 1080 (110) |
- | 10 | - | 39.0 (4.0) |
- | - | - | 321-429 | 3.40-2.95 | 32.0-45.5 |
| more than 60 | 8 | 30.0 (3.0) |
- | ||||||||||
| up to 100 | KP 490 KP (50) |
685 (70) |
not less than 490 (50) |
15 | 40 | 59.0 (6.0) |
440 (45) |
345 (35) |
- | 207-285 | 4.20-3.60 | - | |
| more than 100 | 10 | 49.0 (5.0) | |||||||||||
| 11Х13Н3 | up to 110 | - | - | - | - | - | - | - | - | - | - | - | 33.5-43.5 |
ХН35ВТ (EI 612) |
up to 200 | KP 390 (KP 40) |
735 (75) |
not less than 390 (40) |
15 | 25 | 59.0 (6.0) |
590 (60) |
345 (35) |
20 | not less than 207 | no more than 4.20 | - |
ХН35ВТ-ВД (EI 612-VD) |
up to 200 | KP 390 (KP 40) |
735 (75) |
not less than 390 (40) |
15 | 25 | 59.0 (6.0) |
590 (60) |
345 (35) |
25 | not less than 207 | no more than 4.20 | - |
| 10Х11Н20Т3Р | up to 180 | KP 490 KP (50) |
835 (85) |
not less than 490 (50) |
15 | 20 | 59.0 (6.0) |
635 (65) |
440 (45) |
15 | 255-321 | 3.80-3.40 | - |
| 25Х17Н2Б-Ш | up to 150 | KP 980 (KP 100) |
1270 (130) |
not less than 980 (100) |
8 | 30 | 39.0 (4.0) |
- | - | - | - | - | 44.5-53.5 |
| more than 150 | - | - | - | - | - | - | - | - | - | - | - | 44.5-53.5 | |
ХН35ВТЮ-ВД (EI 787-VD) |
up to 120 | KP 635 (KP 65) |
980 (100) |
not less than 635 (65) |
8 | 10 | 30.0 (3.0) |
- | - | - | 285-363 | 3.60-3.20 | - |
| more than 120 | - | - | - | - | - | - | - | - | - | 285-363 | 3.60-3.20 | - | |
25X1MF (EI 10) |
up to 200 | KP 590 (KP 60) |
685 (70) |
590-785 (60-80) |
16 | 50 | 59.0 (6.0) |
- | 440 (45) |
- | 217-277 | 4.10-3.65 | - |
KP 685 (KP 70) |
785 (80) |
685-835 (70-85) |
16 | 50 | 59.0 (6.0) |
- | 520 (53) |
- | 255-311 | 3.80-3.45 | - | ||
KP 490 KP (50) |
590 (60) |
490-685 (50-70) |
16 | 50 | 59.0 (6.0) |
- | 345 (35) |
- | 197-241 | 4.30-3.90 | - | ||
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Continuation of table 3
| Steel grade | Thickness of the original workpiece, mm |
Strength category, KP |
Mechanical properties at test temperature | Hardness | |||||||||
| 20 °C | 350 °C | according to Brinell | according to Rockwell | ||||||||||
Temporary resistance- rupture σ in , N/ mm2 (kgf/ mm2 ) |
Yield strength σ 0.2 , N/ mm2 (kgf/ mm2 ) |
Relative elongation δ 5 , % |
Relate- body narrowing Ψ, % |
Impact viscosity KCU, J/ cm2 (kgf m/cm 2 ) |
Temporary resist- leniye break σ in , N/ mm2 (kgf/ mm2 ) |
Yield strength σ 0.2 , N/ mm2 (kgf/ mm2 ) |
Relate- body narrowing Ψ, % |
NV | Diameter of the print chatka, mm |
HRCэ | |||
| not less than | not less than | ||||||||||||
| 38ХН3МФА | up to 200 | KP 685 (KP 70) |
785 (80) |
685-850 (70-87) |
15 | 40 | 59.0 (6.0) |
- | 540 (55) |
- | 241-311 | 3.90-3.45 | - |
KP 785 (KP 80) |
880 (90) |
785-950 (80-97) |
14 | 40 | 59.0 (6.0) |
- | 640 (65) |
- | 262-331 | 3.75-3.35 | - | ||
KP 880 (KP 90) |
980 (100) |
880-1080 (90-110) |
11 | 35 | 59.0 (6.0) |
- | 735 (75) |
- | 277-352 | 3.65-3.25 | - | ||
07Х16Н4Б 07Х16Н4Б-Ш |
30-80 | KP 685 (KP 70) |
835 (85) |
not less than 685 (70) |
13 | 50 | 59.0 (6.0) |
720 (73.5) |
540 (55) |
50 | 229-262 | 4.00-3.75 | - |
KP 735 (KP 75) |
880 (90) |
not less than 735 (75) |
13 | 50 | 59.0 (6.0) |
720 (73.5) |
590 (60) |
50 | 248-285 | 3.85-3.60 | - | ||
| 18Х13Н3 | 8-110 | - | - | - | - | - | - | - | - | - | not less than 401 | no more than 3.05 | - |
| 20X13 | 10-180 | - | - | - | - | - | - | - | - | - | - | - | 41.5-49.5 |
KP 440 (KP 45) |
835 (85) |
not less than 440 (45) |
15 | 50 | 69.0 (7.0) |
- | - | - | 197-248 | 4.30-3.85 | - | ||
KP 590 (KP 60) |
785 (80) |
not less than 590 (60) |
12 | 45 | 59.0 (6.0) |
- | - | - | 217-285 | 4.10-3.60 | - | ||
30X13 30X13-SH |
20-140 | - | - | - | - | - | - | - | - | - | - | - | 46.5-54.0 |
KP 590 (KP 60) |
805 (82) |
not less than 590 (60) |
12 | 45 | 39.0 (4.0) |
- | - | - | 217-285 | 4.10-3.60 | - | ||
| 40X13 | 10-100 | - | - | - | - | - | - | - | - | - | - | - | 47.5-57.0 |
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Notes:
1. For parts operating at temperatures not exceeding 100 °C, mechanical properties are tested at a temperature of 20 °C.
For parts operating at temperatures above 100°C but not above 350°C, mechanical properties are tested at temperatures of 20°C and 350°C.
2. The mechanical property values refer to longitudinal samples.
In the case of testing mechanical properties on tangential and radial samples, a reduction in mechanical properties from the table standards is permitted:
when testing on tangential samples: tensile strength (σ in ) and yield strength (σ 0.2 ) - by 5% each;
relative elongation (δ 5 ) and impact strength (KCU) - by 2% each;
relative narrowing (Ψ) - by 20%;
when testing on radial samples: tensile strength (σ in ) and conditional yield strength (σ 0.2 ) - 10% each;
relative elongation (δ 5 ) and relative contraction (Ψ) - by 35% each;
impact strength (KCU) - by 40%.
3. Heat treatment of parts made of steel grade 25X17N2B-Sh is performed with minimum allowances on the surface, while the cross-section of the blanks for heat treatment is no more than 60 mm.
4. For parts made of steel grades 25Kh17N2B-Sh, 14Kh17N2 (KP 0) and 11Kh13N3, intended for operation in corrosive environments, the level of design stresses should not exceed 245 N/ mm2 (25 kgf/ mm2 ).
5. The hardness value for steel grade 11X13N3 applies to blanks with a cross-section for heat treatment of no more than 60 mm.
6. In exceptional cases, at the reasonable request of the designer, it is permitted to use steel grades ХН35ВТ (ЭИ 612) and ХН35ВТ-ВД (ЭИ 612-ВД) with KP 490 (KP 50). In this case, the standards for mechanical properties are stipulated in the technical requirements of the drawings and are ensured by selective selection.
7. For steel grade 14X17N2, strength category KP 0 32.0….45.5 HRCэ is assigned in exceptional cases upon agreement with the metallurgy department.
8. For blanks of parts made of steel grade 10X11N20T3R (EI 696) of NPP equipment subject to cyclic loads, the value of relative contraction (Ψ) at a temperature of 350 °C must be at least 20%, which is ensured by selective selection and specified in the drawing. Drawings of such parts must be agreed with the metallurgy department.
9. Mechanical properties at elevated temperatures for steel grades 07Kh16N4B and 07Kh16N4B-Sh for the first five heats are not acceptance tests, but are entered into the certificate.
10. Steel grades 25Kh1MF and 38KhN3MFA for fasteners of products manufactured in accordance with the requirements of "Conditions 01-1874-62" are not used under these technical conditions.
The values of S 0 , S 1 , n 0 for direct and inclined converters must correspond to Table 4.
1.2.5.2. For blanks of parts made of martensitic steel (11Х13Н3, 18Х13Н3, 25Х17Н2Б-Ш, 20Х13, 30Х13, 30Х13-Ш, 40Х13) and martensitic-ferritic steel (14Х17Н2):
when testing with direct and inclined transducers, defects with an equivalent area of 5 mm2 or more are subject to recording;
Defects with an equivalent area of more than 5 mm2 are not allowed, which is ensured by selective selection.
1.2.5.3. Ultrasonic testing standards for workpieces made of pearlitic steel (25Kh1MF and 38KhN3MFA) must comply with GOST 23304-78.
1.2.5.4. If necessary, the drawings of parts (blanks) must indicate areas in which defects recorded during ultrasonic testing are not permitted.
These zones should cover parts where the wall thickness or net diameter is less than 30 mm.
In this case, it is necessary to use steel produced by electroslag or vacuum arc remelting.
1.2.6. The metal of blanks made of steel grades 14Kh17N2 (KP 490), 07Kh16N4B, 07Kh16N4B-Sh must be resistant to intercrystalline corrosion (ICC).
Table 4
| Converter type | Class of blanks according to ultrasonic testing | Thickness of the workpiece in the direction of sounding, mm |
S 0 , mm 2 |
S 1 , mm 2 |
n 0 , pcs. |
| Direct | 1 | up to 150 over 150 to 200 over 200 to 250 |
5 5 5 |
7 10 15 |
8 6 8 |
| 2 | up to 100 over 100 to 250 |
5 10 |
15 20 |
6 7 | |
| Inclined | 1 | up to 100 over 100 to 150 over 150 to 200 over 200 to 250 |
5 20 40 70 |
7 20 40 70 |
8 5 - - |
| 2 | up to 100 over 100 to 200 over 200 to 250 |
5 40 70 |
15 40 70 |
8 3 - |
Notes: 1. The class of blanks according to UZK must be specified in the drawing requirements.
2. In case of ultrasonic testing according to class 1 of the ultrasonic testing standard
are provided by selective selection.
3. For class 2 workpieces according to ultrasonic testing, when tested with a direct transducer,
for workpieces up to 100 mm thick, the number of defects (n 0 ) is equivalent
with an area from 100 to 15 mm2 no more than 2 pieces are allowed, and with a thickness of over
100 mm number of defects (n 0 ) equivalent to an area of 15 to 20 mm 2
no more than 3 pieces are allowed.
1.2.7. Standards for permissible content of non-metallic inclusions in accordance with the requirements of Table 5.
1.2.8. Gears made of steel grades 14X17N2 with a hardness of 32.0….45.5 HRCэ, 11X13N3, 18X13N3 and 25X17N2B-Sh are additionally subjected to capillary flaw detection testing.
Cracks of any length, cavities, non-metallic inclusions and other defects that appear as linear indicator traces during capillary testing are unacceptable on the surface of the part.
A linear indicator trace is characterized by a length-to-width ratio of more than three.
The following are not allowed:
round indicator marks larger than 5.0 mm;
four or more rounded indicator marks less than 5.0 mm in size in a line with a distance between the edges of 1.5 mm or less;
five or more rounded indicator marks less than 5.0 mm in size over any area of 40 cm2 with a maximum length of this area of 15 cm.
Indications less than 1.0 mm are not taken into account.
A rounded indicator trace is characterized by a length-to-width ratio equal to or less than three.
In doubtful cases, the manufacturer determines the nature of the indicator traces detected during capillary testing.
1.3. Completeness.
1.3.1. A certificate is issued for blanks accepted by the manufacturer's quality control service, which indicates:
content of marking;
steel grade and chemical composition of the melt (according to the certification data of the plant supplying the rolled products);
beginning l 13
Table 5
Standards for permissible content of non-metallic inclusions (based on average score)
| Steel grade | Types of inclusions | |||||||
String oxides (OS) |
Point oxides (FROM) |
Silicates are brittle (SH) |
Plastic silicates (SP) |
Non-deformable silicates (CH) |
Sulfides (WITH) |
Nitrides and carbonitrides point | String nitrides and carbonitrides | |
ХН35ВТ 10Х11Н20Т3Р ХН35ВТЮ-ВД 30X13-SH 07Х16Н4Б 14Х17Н2 11Х13Н3 20X13 30X13 40X13 18Х13Н3 ХН35ВТ-ВД 07Х16Н4Б-Ш 25Х17Н2Б-Ш |
2.5 2.0 2.0 1.5 2.0 3.5 2.0 3.5 2.0 2.0 2.0 |
2.5 2.0 2.0 1.5 2.0 3.5 2.0 3.5 2.0 2.0 2.0 |
2.5 2.5 1.0 1.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 |
2.0 2.0 1.0 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 |
2.5 2.5 2.0 1.5 2.0 2.5 2.0 2.0 2.0 2.0 2.0 |
2.0 2.0 1.0 1.0 2.0 2.5 2.0 2.5 2.0 2.0 2.0 |
4.0 2.5 3.0 1.5 1.5 2.5 1.5 1.5 1.5 1.5 1.5 |
4.5 4.5 4.5 1.5 1.5 2.5 1.5 1.5 1.5 1.5 1.5 |
according to TU 14-1-1665-76 according to TU 14-1-3573-83 according to TU 14-1-1062-74 | ||||||||
Notes:
1. The standards for the permissible content of non-metallic inclusions for blanks made of steel grades ХН35ВТ, 14Х17Н2 are acceptance standards and are entered into the certificate.
2. The standards for the permissible content of non-metallic inclusions for blanks made of steel grades 10Х11Н20Т3Р, ХН35ВТЮ-ВД, 30Х13-Ш, 07Х16Н4Б, 11Х13Н3, 20Х13, 30Х13, 40Х13, 18Х13Н3 are not acceptance standards for 15 heats of each steel grade. In the case of a collection of statistical data, acceptance standards will be established by 01.07.93.
3. Standards for the permissible content of non-metallic inclusions in blanks made of steel grades ХН35ВТ-ВД, 07Х16Н4Б-Ш, 25Х17Н2Б-Ш are not determined; acceptance standards are the standards from the supplier's certificate in accordance with the technical conditions specified in this table. At the same time, any form of recording the content of non-metallic inclusions in the supplier's certificate in accordance with OST 14-20-76 is allowed (in the form of points or in the form of the text "satisfactory").
4. For blanks made of steel grades 38ХН3МФА and 25Х1МФ, the content of non-metallic inclusions is not determined.
control of macrostructure (according to the certificate data of the plant-supplier of rolled products);
type of heat treatment;
mechanical properties and hardness;
results of ultrasonic testing;
results of resistance testing against MCC;
results of capillary testing (in accordance with clause 1.2.8.);
results of control of the size of non-metallic inclusions;
serial number of the product;
group number;
quantity and weight of blanks;
designation of technical conditions.
The certificate is signed by the manufacturer's quality control department.
If the part is a passport part, the passport form is developed by the manufacturer's OGTE and agreed upon with the technical services.
1.4. Marking.
1.4.1. Marking of blanks must be carried out in accordance with GOST 7566-94 and must contain: drawing designation, melt number, part number.
1.4.2. The correctness of marking and compliance of the quality of blanks with the requirements of these technical conditions must be certified by the manufacturer's quality control stamp.
2. SAFETY REQUIREMENTS
2.1. When manufacturing blanks, performing loading and unloading operations and transportation, the manufacturer must comply with the requirements of GOST 12.3.002-75, GOST 12.3.009-76, GOST 12.3.020-80, as well as the requirements of the provisions, rules and instructions on safety engineering, industrial sanitation and fire safety, agreed upon and approved in the established manner.
3. ACCEPTANCE RULES
3.1. Acceptance of each blank must be carried out based on the results of delivery tests by the quality control department of the blank manufacturer and acceptance tests by external acceptance bodies in accordance with the requirements of these technical conditions.
3.2. All workpieces are subject to quality control of the surface, dimensions and markings.
To check the quality of steel blanks, the following are selected:
for tensile testing - two specimens from the sample for each test temperature;
to determine impact strength - three samples from the test;
to control the hardness - each workpiece;
to control resistance to MCC - the number of samples in accordance with GOST 6032-89;
to control the size of non-metallic inclusions - the number of samples in accordance with GOST 1778-70; it is permitted to use the heads of a tensile specimen tested at a temperature of 20°C;
for penetrant testing - gears made of steel grades 14X17H2 (hardness 32.0….45.5 HRCэ), 11X13H3, 25X17H2Б-Ш, 18X13H3 as required by the drawing;
for ultrasonic testing - each workpiece according to the requirements of the drawing.
3.3. Sampling and preparation of specimens for mechanical testing is carried out in accordance with GOST 7564-97.
The correctness of the sample production is certified by the Quality Control Department stamp on each sample.
From each batch of blanks, samples are taken in the amount of 1% of the number of blanks, but not less than two pieces (blanks with the lower and upper limits of hardness).
It is permissible to determine the mechanical properties of one workpiece when the number of workpieces in a batch is up to 20 pieces, if the difference in the hardness prints of the entire batch does not exceed 0.30 mm for KP 440 and less than 0.20 mm for KP 490 and more.
3.4. In cases where the configuration of workpieces of groups IV and V, processed for high hardness (at least 33.5 HRCэ), does not allow for allowances for mechanical testing, it is permissible to perform mechanical testing on samples made from a sample or workpiece (part), selected from the same workpiece of rolled products as the part and heat-treated together with the workpiece.
The hardness of the sample or workpiece (part) must be within the strength category specified in the drawing for the part.
3.5. If unsatisfactory results are obtained from testing mechanical properties, it is permissible to perform repeated tests on a double number of samples taken from the same blanks or parts, or from other blanks or parts with the same hardness.
Repeated tests are carried out for the indicators for which unsatisfactory results were obtained.
If the test results are unsatisfactory, a batch of blanks may be allowed to manufacture parts after repeated heat treatment or after control testing of blanks that are suitable after re-sorting according to hardness and mechanical properties.
The number of repeated heat treatments is no more than two.
Additional tempering is not considered reheat treatment.
3.6. If the value of non-metallic inclusions does not meet the values of Table 5 of these technical conditions, a repeated check is carried out on a double number of samples. Samples for repeated checking are cut out from the sample for testing mechanical properties.
In the event of unsatisfactory results after repeated testing, the question of the suitability of the blanks is decided jointly by the materials science organization and the manufacturer.
4. TEST METHODS
4.1. The quality of the workpiece surface is checked without cleaning by visual inspection. Questionable areas, at the request of the Quality Control Department, must be cleaned and inspected.
4.2. Control of the dimensions of the workpieces is ensured by measuring instruments and methods specified in the manufacturer's technological documentation.
4.3. Tensile testing should be carried out on short specimens of type III No. 4 or No. 6 according to GOST 1497-84 at normal temperature and according to GOST 9651-84 at elevated temperature.
4.4. Impact toughness testing is performed on type I samples in accordance with GOST 9454-78.
4.5. Rockwell hardness measurement is carried out in accordance with GOST 9013-59.
Brinell hardness measurement is carried out in accordance with GOST 9012-59.
4.6. Testing of blanks made of steel grades 14X17N2 (KP 490),
07Kh16N4B, 07Kh16N4B-Sh for resistance to MKK is carried out on longitudinal samples cut from the middle of the workpiece, using the AM method without provoking heating according to GOST 6032-89. The duration of holding in the solution should be 15 hours. The radius of curvature of the mandrels should correspond to the radius of curvature of the mandrels for samples made of ferritic and austenitic-martensitic steel grades according to GOST 6032-89.
4.7. The size of non-metallic inclusions is controlled according to GOST 1778-70 method Ш-4.
4.8. Penetrant testing is performed to detect surface defects on parts in accordance with paragraph 1.2.7 of these technical conditions according to PN AE G-7-018-89, sensitivity class II for workpieces covered by the "Rules for the Design and Safe Operation of Equipment and Pipelines of Nuclear Power Plants" and according to RD 5.9537-80, sensitivity class II for workpieces for other purposes.
4.9. Ultrasonic testing must be carried out in accordance with PN AE G-014-89 (part 1) for workpieces covered by the "Rules for the Design and Safe Operation of Equipment and Pipelines of Nuclear Power Plants" and in accordance with OST 5.9675-88 for workpieces for other purposes.
5. TRANSPORTATION AND STORAGE
5.1. Workpieces may be transported by rail or road. Transportation conditions must comply with GOST 15150-69.
Inter-operational transportation and transportation during loading and unloading operations must ensure the absence of residual deformations, disruption of shape, size and surface quality.
5.2. The placement of blanks on a vehicle must be carried out in accordance with the loading documentation developed by the manufacturer.
5.3. When performing loading and unloading operations, it is necessary to be guided by the requirements of GOST 22235-76.
5.4. The consumer must store the blanks in accordance with the storage conditions 4 of GOST 15150-69.
Storage conditions must ensure the absence of residual deformations, preservation of the surface from mechanical damage and violations of shape and size.
