TU 0893-072-00212179-2011 extract (1.1)
Extract from TU 0893-072-00212179-2011
Blanks made of steel grade 06X12H3D. Technical conditions
1. Technical requirements
1.1 Basic parameters of blanks
1.1.1 Blanks must comply with the requirements of these technical conditions and drawings or sketches, which are developed on the basis of drawings of parts. In the case of delivery of blanks to other enterprises, drawings or sketches are developed by the manufacturer on the basis of the drawing of the customer (the enterprise ordering the blanks) and agreed upon with the customer. The customer agrees on the drawings and sketches of blanks with the product developer.
1.1.2 Depending on the requirements imposed on the parts according to their operating conditions, workpieces that have undergone heat treatment are divided into four groups according to the type and scope of tests in accordance with Table 1.
According to mechanical properties, workpieces are divided into strength categories in accordance with Table 2.
The test group, strength category, need for strength control, need for ultrasonic testing for workpieces of groups I and II, increased temperature for testing mechanical properties for workpieces of groups II and IV must be specified in the technical requirements of the drawing or order.
1.1.3 The blanks must be delivered to the consumer after the main heat treatment.
1.1.4 The maximum cross-section of workpieces for heat treatment must not exceed 550 mm.
1.1.5 The enterprise performing mechanical processing of blanks for ultrasonic testing and, if necessary, for primary heat treatment, must be specified in the contract. Blanks must be transferred for mechanical processing (if carried out by the consumer) after preliminary heat treatment.
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| Table 1 - Test groups | ||||||||
| Group designation | Type of mandatory tests | Batch picking conditions | Volume of control tests | |||||
| Mechanical tests at 20°C | Mechanical testing at elevated temperature | Macro-structure control | Determination of corrosion resistance | UZK | Determination of hardness | |||
| I | 1 Mechanical tests at a temperature of 20 °C: determination of the conditional yield strength, tensile strength, relative elongation, relative contraction, impact toughness. 2 Determination of hardness. 3 Control of macrostructure. 4 Determination of corrosion resistance (according to requirement of the drawing or order). 5 UZK (as required by the drawing or order). |
Blanks from the same melt that have undergone heat treatment together Same |
One blank or one sample from a batch Same |
- | From melting | From melting according to the drawing or order requirements | Each workpiece is made according to the drawing or order requirements | Each blank |
| II | 1 Mechanical tests at a temperature of 20 °C: determination of the conditional yield strength, tensile strength, relative elongation, relative contraction, impact toughness. 2 Determination of hardness. 3 Mechanical tests at elevated temperatures: determination of the conditional yield strength, tensile strength, relative elongation, relative contraction. 4 Control of macrostructure. 5 Determination of corrosion resistance (according to requirement of the drawing or order). 6 UZK (as required by the drawing or order). |
One blank or one sample from a batch | ||||||
| III | 1 Mechanical tests at a temperature of 20 °C: determination of the conditional yield strength, tensile strength, relative elongation, relative contraction, impact toughness. 2 Determination of hardness. 3 Control of macrostructure. 4 Determination of corrosion resistance (according to requirement of the drawing or order). 5 UZK. |
Each workpiece is accepted individually. | Each blank or sample | - | Each blank | Each workpiece is made according to the drawing or order requirements | Each blank | Each blank |
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| Continuation of table 1 | ||||||||
| Group designation | Type of mandatory tests | Conditions for completing a batch | Volume of control tests | |||||
| Mechanical tests at 20°C | Mechanical testing at elevated temperature | Macrostructure control | Determination of corrosion resistance | UZK | Determination of hardness | |||
| IV | 1 Mechanical tests at a temperature of 20 °C: determination of the conditional yield strength, tensile strength, relative elongation, relative contraction, impact toughness. 2 Determination of hardness. 3 Mechanical tests at elevated temperatures: determination of the conditional yield strength, tensile strength, relative elongation, relative contraction. 4 Control of macrostructure. 5 Determination of corrosion resistance (according to requirement of the drawing or order). 6 UZK. |
Each workpiece is accepted individually. | Each blank or sample | Each blank or sample | Each blank | Each workpiece is made according to the drawing or order requirements | Each blank | Each blank |
Notes 1 For blanks intended for the manufacture of parts covered by PNAE G-7-008-89, conducting ultrasonic testing must be performed on each workpiece. 2 For workpieces that come into contact with the working environment, corrosion resistance testing is mandatory. 3 Batches of groups I and II are assembled from blanks manufactured according to one drawing. It is allowed to combine into batches blanks made according to different drawings, differing in cross-section by no more than 25%, similar in configuration. 4 When manufacturing several parts of different groups from one blank, the test results of the highest group apply to all previous groups. 5 Blanks of groups I and III are used only for the manufacture of parts operating at temperatures below 100 °C. | ||||||||
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| Table 2 - Mechanical properties at plus 20 °C and elevated temperatures | ||||||||
| Type of workpiece and delivery conditions | Strength category | Test temperature, °C | Mechanical properties determined at test temperature (not less than) | |||||
Yield strength σ 0.2, N/mm² (kgf/mm²) |
Temporary tensile strength σ in , N/mm² (kgf/mm²) |
Relative elongation δ 5 ,% | Relative narrowing Ψ,% |
Impact strength KCV, J/cm² (kgcm/cm²) | Brinell hardness, HB | |||
| Workpieces with a cross-section of no more than 300 mm, supplied without technological tempering | KP 60 | 20 | 590 (60) | 686 (70) | 12 | 35 | 59 (6) | 207-293 |
| 150 | 559 (57) | 657 (67) | 12 | 35 | - | - | ||
| 200 | 539 (55) | 638 (65) | 12 | 35 | - | - | ||
| 250 | 519 (53) | 618 (63) | 12 | 37 | - | - | ||
| 300 | 500 (51) | 598 (61) | 10 | 40 | - | - | ||
| 350 | 490 (50) | 589 (60) | 10 | 40 | - | - | ||
| Workpieces with a cross-section greater than 300 mm, supplied without technological tempering | KP 55 | 20 | 540 (55) | 638 (65) | 14 | 35 | 59 (6) | 207-293 |
| 150 | 530 (54) | 628 (64) | 12 | 35 | - | - | ||
| 200 | 520 (53) | 618 (63) | 12 | 35 | - | - | ||
| 250 | 510 (52) | 608 (62) | 12 | 37 | - | - | ||
| 300 | 500 (51) | 598 (61) | 10 | 40 | - | - | ||
| 350 | 490 (50) | 589 (60) | 10 | 40 | - | - | ||
Forgings supplied: - with determination of corrosion resistance; - with the implementation of technological vacations; - with determination of corrosion resistance and carrying out technological tempering. |
KP 50 | 20 | 490 (50) | 589 (60) | 14 | 35 | 59 (6) | 207-293 |
| 150 | 481 (49) | 579 (59) | 14 | 37 | - | - | ||
| 200 | 471 (48) | 569 (58) | 12 | 37 | - | - | ||
| 250 | 461 (47) | 559 (57) | 10 | 38 | - | - | ||
| 300 | 451 (46) | 549 (56) | 10 | 40 | - | - | ||
| 350 | 441 (45) | 540 (55) | 10 | 40 | - | - | ||
Notes 1 The mechanical property values refer to longitudinal samples; 2 For forgings with a cross-section greater than 400 mm of strength category KP 55, a reduction in the relative value is permitted. narrowing by 5%, against the value indicated in the table; 3. When determining the mechanical properties of forgings on transverse, tangential or radial samples, A reduction in mechanical property standards is permitted in accordance with GOST 8479. | ||||||||
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processing with a hardness of no more than 255 HB, while these blanks can be used for the manufacture of parts after the main heat treatment with testing in accordance with the test group indicated on the drawing.
1.1.6 Materials, as well as all technological operations related to the smelting and casting of steel, the manufacture of forgings and stamped blanks, their control, repair and delivery, must meet the requirements of PNAE G-7-008-89, PNAE G-7-009-89, PNAE G-7-010-89, OST 24.300.04 and the production and technological documentation of the manufacturer, agreed with JSC NPO TsNIITMASH (the leading materials science organization).
1.2 Dimensions of blanks
1.2.1 The dimensions of forged or stamped blanks must correspond to the drawing or sketch.
1.2.2 When manufacturing blanks, allowances for mechanical processing, technological allowances and tolerances for manufacturing accuracy are established in accordance with the manufacturer's regulatory documentation; allowances for sampling - in accordance with the indication of the blank drawing. Uneven arrangement of allowances resulting from ellipticity, misalignment of the outer and inner diameters, deflection is allowed, while the uneven arrangement of the actual allowance in individual parts should not take the dimensions beyond the limits of permissible deviations.
Bevels, fillets, and fringe are not included in the dimensions of the workpiece.
1.2.3 The design of stamped blanks must provide for mechanical processing of the joining edges along the outer and inner diameters in order to remove the ellipticity that occurs during stamping and heat treatment. The value
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The amount of such allowance is determined by the thickness of the original workpiece and is agreed upon with the manufacturer.
1.3 Smelting and chemical composition
1.3.1 Blanks must be made from ingots of the manufacturer's grade 06X12H3D steel.
Steel grade 06X12H3D must be smelted in an electric arc or induction furnace with subsequent extra-furnace treatment and vacuuming. Extra-furnace treatment using argon-oxygen decarburization or vacuum-oxygen decarburization is allowed. Steel is poured according to the manufacturer's technology.
1.3.2 The melting chemical composition of the steel must comply with the requirements specified in Table 3.
Table 3 - Chemical composition of steel 06Х12Н3Д
| Mass fraction of chemical elements, % | |||||||
| Carbon | Chromium | Nickel | Copper | Manganese | Silicon | Sulfur | Phosphorus |
| no more | |||||||
| 0.02-0.06 | 12.00-13.50 | 2.80-3.20 | 0.80-1.10 | 0.60 | 0.30 | 0,020 | 0,020 |
| Note - for blanks used in equipment in contact with radioactive environments, the cobalt content in steel should be no more than 0.2% (indicated on the drawings) | |||||||
Casting of large ingots by mixing metal from several melts (ladles) is permitted. The chemical composition of each melt (ladle) must also comply with the requirements of Table 3. In this case, the average mass content of each element is considered the delivery chemical composition.
1.4 Manufacturing of blanks
1.4.1 The production of blanks must be carried out according to
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production and technological documentation of the manufacturer, developed and agreed upon in accordance with the requirements of PNAE G-7-008-89.
1.4.2 It is permitted to manufacture forgings in a block for several parts. The enterprise that cuts the blocks into parts is specified in the contract.
Cutting of forgings is performed by oxygen-flux or other method according to the manufacturer's mode. Burr must be removed from the cutting surface.
When gas cutting blanks, the manufacturer allows for cut bevels and flame snags on the cutting edges, which must be within the tolerances for preliminary mechanical processing and not be included in the finished dimensions of the part.
1.5 Surface requirements
1.5.1 There should be no cracks, delaminations, films, folds, bubbles, cavities, rough rolled scale or slag inclusions on the surface of forgings and stamped blanks.
1.5.2 The quality and appearance of forgings must meet the requirements of GOST 7062.
In terms of allowances and permissible deviations, the workpieces must meet the requirements of the manufacturer's drawings.
1.5.3 Forging and thermal scale that does not prevent the detection of defects on the surface of the workpieces is not removed.
Rough spots are allowed on sample allowances that do not interfere with the production of a complete set of test samples.
On unprocessed surfaces of workpieces, local defects such as dents from scale, nicks, as well as gentle cutting or cleaning of defects are allowed without removal, provided that the dimensions
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mechanical properties and corrosion resistance of metal samples that have undergone additional tempering in a separate batch according to the manufacturer's production and technological documentation at the following temperatures and holding times:
| Mode A: | Vacation plus (620 ± 10) ℃ - from 4.5 to 5 hours | |
| Vacation plus (640 ± 10) ℃ - from 7.5 to 8 hours | ||
| Mode B: | Vacation plus (620 ± 10) ℃ - from 22.5 to 25 hours | |
| Vacation plus (640 ± 10) ℃ - from 15 to 16 hours |
The total duration of holding of workpieces during technological tempering shall not exceed 41 hours, including the maximum duration of holding during tempering (620 ± 10) ℃ shall not exceed 25 hours and the maximum duration of holding during tempering (640 ± 10) ℃ shall not exceed 16 hours. When determining the total duration of tempering, only the holding time at the tempering temperature is taken into account.
Technological heating up to 450 ℃ is not taken into account.
1.6.7 Standard values of mechanical properties and corrosion resistance after additional tempering according to modes A and B must comply with the requirements of Table 2 and subparagraph 1.6.5.
1.6.8 When delivering blanks to other enterprises, the need, quantity, temperature and duration of technological tempering are indicated on the customer's drawings, agreed upon with JSC NPO TsNIITMASH.
1.7 Macrostructure
1.7.1 The macrostructure of the blanks should not contain any shrinkage looseness, cracks, flakes, or delaminations visible to the naked eye. Areas of increased etching with scratches no longer than 20 mm are allowed.
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1.8 Ultrasonic flaw detection
1.8.1 After the main heat treatment, the workpieces are subjected to ultrasonic flaw detection (UZD) according to the PNAE G-7-014-89 method.
1.8.2 Workpiece based on ultrasonic testing results
is considered suitable if it satisfies the following criteria:
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 with an equivalent area from S 0 mm2 to S 1 mm2 inclusive are not allowed if they are assessed as extended;
defects that, when tested with a direct transducer, cause a weakening of the bottom signal to level S 0 or lower are not allowed;
Defects with an equivalent area from S 0 mm 2 to S 1 mm 2 inclusive are not allowed if they are assessed as non-extended, but constitute a cluster of n 0 or more defects with a spatial distance between the most distant defects equal to or less than 100 mm. The minimum permissible distance between defects taken into account is 30 mm.
The values of S 0 , S 1 , n 0 must comply with the requirements of Table 4.
Table 4
| Thickness, mm | S 0 , mm 2 | S 1 , mm 2 | n 0 |
| up to 250 incl. | 10 | 20 | 6 |
| over 250 to 400 incl. | 20 | 40 | |
| over 400 | 40 | 70 |
1.8.3 Defects detected in metal subject to removal during subsequent mechanical processing or sample cutting are not a rejection feature. In the event of removal of the specified defects,
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3.3.1 Tests of mechanical properties and impact toughness, as well as assessment of corrosion resistance, are performed on samples cut from specimens. Samples of blanks of groups I and II are taken from a batch. The conditions for completing a batch are set out in Table 1. For groups III and IV, samples are taken from each blank.
3.3.2 Tensile tests at normal temperature (20 ± 10) ℃ are carried out on two cylindrical samples according to GOST 1497 with a working part diameter of 10 mm and a calculated length of 50 mm (sample type III No. 4 or IV No. 4) or with a working part diameter of 6 mm and a calculated length of 30 mm (sample type III No. 6 or IV No. 6).
3.3.3 Tensile tests at elevated temperatures are carried out on two cylindrical samples in accordance with GOST 9651 with a working part diameter of 6 mm, a calculated length of 30 mm with an M12 threaded head (type I sample No. 2) or with a working part diameter of 10 mm, a calculated length of 50 mm with an M16 threaded head (type I sample No. 4).
3.3.4 Impact bending tests at normal temperature (20 ± 10) ℃ are carried out on three type II samples according to GOST 9454.
3.3.5 Corrosion resistance tests are carried out on four samples from a melt measuring 3x20x80 mm in accordance with the ICC-01-99 instruction.
3.3.6 If unsatisfactory test results are obtained on at least one sample, repeat tests are carried out on a double number of samples taken from the same workpiece on the same side or from the same batch (when checking properties and submitting workpieces in batches). If unsatisfactory results are obtained during repeated testing on at least one sample, repeated heat treatment or tempering is allowed, and the metal is presented again for submission.
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