TU 14-1-1589-2015
| OKP 09 6488 | 1721 | ISS 77.140.60 Group B 32 I APPROVEDeputy Chairman of TC 375 "Metal products made of ferrous metals metals and alloys" V. T. Ababkov «03» 09 2015 |
HOT-ROLLED AND FORGED RODS FROM HEAT-RESISTANT
ALLOY GRADE 08KHN35VTYU-VD (EI787-VD)
TECHNICAL SPECIFICATIONS
TU 14-1-1589-2015
(Replaces TU 14-1-1589-76)
Holder of the original: TsSSM FSUE "TsNIIchermet named after I.P. Bardin"
Validity period:
AGREED Technical Director JSC Metallurgical Plant "Elektrostal" №933-29/13 I.V. Kabanov «23» 07 2015 Director of the Institute of New Metallurgy of the scientific technologies of JSC "Composite" №0700-130 V.N. Butrim «20» 08 2015 |
DEVELOPED Acting Head of the Standardization Laboratory FSUE "TsNIIchermet named after I.P. Bardin" S.A. Gorshkov «03» 07 2015 |
On page 10.
C.2
TU 14-1-1589-2015
These technical conditions apply to the supply of hot-rolled and forged rods made of heat-resistant alloy grade 08KhN35VTYu-VD (EI787-VD), smelted by the vacuum-arc remelting method.
Examples of symbols:
Hot-rolled rod (h/r), round, measured length (ML), 20 mm in diameter according to GOST 22411-77, made of alloy grade 08KhN35VTYu-VD (EI787-VD):
Round hot-rolled steel MD-20 GOST 22411-77/08ХН35ВТЮ-ВД (EI787-ВД) TU 14-1-1589-2015.
Hot-rolled rod (h/r), round, 65 mm in diameter, made of alloy grade 08ХН35ВТЮ-ВД (ЭИ787-ВД):
Round hot-rolled 65-08ХН35ВТЮ-ВД (EI787-ВД) TU 14-1-1589-2015.
Forged rod (forged), round, measured length (ML) 1000 mm, diameter 60 mm according to GOST 22411-77, made of alloy grade 08KhN35VTYu-VD (EI787-VD):
Wheel MD-60x1000 GOST 22411-77/08HN35VTYu-VD(EI787-VD) TU 14-1-1589-2015.
1 Assortment
1.1 The products are manufactured in the form of hot-rolled (h/r) and forged (forged) rods with a diameter or square side from 8 to 180 mm inclusive in accordance with the manufacturer's specialization.
1.2 In terms of shape, dimensions and maximum deviations, the rods must comply with:
1.2.1 Hot rolled:
- round with a diameter from 8 to 55 mm inclusive - meets the requirements of GOST 22411 2nd rolling accuracy group.
The maximum deviations of hot-rolled round bars with a diameter of 8 and 9 mm are set according to a diameter of 10 mm.
- round with a diameter from 60 to 70 mm inclusive - with maximum diameter deviations of plus or minus 2.5 mm; with a diameter of 75 mm with maximum diameter deviations of plus or minus 3.0 mm;
- square bars with a square side from 20 to 25 mm inclusive - meet the requirements of GOST 22411 2nd rolling accuracy group, as for round bars of the same nominal size.
The ovality of the rods should not exceed 0.7 of the sum of the maximum deviations. The curvature should not exceed 6 mm per 1 m of length.
C.3
TU 14-1-1589-2015
1.2.2 Forged
- round and square - meet the requirements of GOST 22411.
2 Technical requirements
2.1 The chemical composition of the alloy grade 08KhN35VTYu-VD (EI787-VD) according to melt analysis must comply with GOST 5632.
2.1.1 Boron is introduced into the metal by calculation and is not determined by chemical analysis.
2.1.2 In finished products, maximum deviations in chemical composition and mass fraction of residual elements - according to GOST 5632.
2.1.3 A residual mass fraction of molybdenum of up to 0.60% is allowed.
2.1.4 A deviation of 0.02% in the mass fraction of carbon is allowed, provided that the requirements of the technical specifications are met.
2.2 The rods are supplied without heat treatment.
2.3 The mechanical properties and hardness of rods, determined on longitudinal samples cut from heat-treated blanks with a diameter and square side of 25 mm, at a temperature of () °C must comply with the standards of Table 1.
Table 1
| Recommended heat treatment mode | Mechanical properties, not less than | Brinell hardness HB (print diameter, mm) | ||||
Ultimate strength σ in , N/mm 2 (kgf/ mm2 ) |
Yield strength σ 0.2 , N/mm 2 (kgf/ mm 2 ) |
Relative | Impact toughness KSU, J/cm 2 (kgf m/cm 2 ) | |||
| elongation δ 5 , % | narrowing ψ, % | |||||
Quenching at temperatures from 1050 °C to 1080 °C, holding for 8 hours, air cooling. Aging at 750°C - 16 h, air cooling |
1130 (115) |
735 (75) |
15 | 20 | 78 (8) |
302-363 (3.5-3.2) |
| Note - Impact bending tests are carried out on round sections with a diameter of 16 mm or more. | ||||||
2.4 The mechanical properties of rods (σ in , σ 0.2 , δ 5 , ψ, КСU) at a temperature of 700 °C are determined on longitudinal samples cut from blanks heat-treated according to the conditions in Table 1.
Actual control results are recorded in the quality document.
2.5 Short-term creep at a temperature of 700 °C for 15 min with an applied stress of 570 N/mm² (58 kgf/mm²) is determined on longitudinal samples cut from blanks heat-treated according to the conditions in Table 1.
Actual control results are recorded in the quality document.
C.4
TU 14-1-1589-2015
2.6 The macrostructure of the rods must be free of pores, fistulas, cracks, delaminations, coarse pores and slag inclusions visible without the use of magnifying devices.
2.7 There should be no cracks, folds, or films on the surface of the rods. The said defects should be removed by gentle cleaning. The depth of cleaning of defects should not exceed the sum of the maximum deviations in size, calculated from the nominal value.
Small hairlines, scratches, dents, and ripples within half the sum of the maximum deviations are allowed without cleaning.
The ratio of the cleaning depth to its width should be at least 1:6.
2.8 The degree of internal defects in rods with a diameter of 45 mm or more and a square side of 80 mm or more during ultrasonic testing must correspond to quality group 1 according to GOST 21120.
3 Acceptance rules and testing methods
3.1 Rods are presented for acceptance in batches consisting of one heat and one size.
3.2 To check the chemical composition, samples are taken in accordance with GOST 7565.
Chemical analysis is carried out according to GOST 12344 - GOST 12357, GOST 12360, GOST 12361 and GOST 28473 or other methods that ensure the required accuracy of analysis.
3.3 Determination of mechanical properties during tensile testing is carried out according to GOST 1497 and GOST 9651 on two samples for each type of test.
Impact toughness is determined on two samples in accordance with GOST 9454.
3.4 The short-term creep test is carried out according to the attached method (Appendix A) on two samples.
Note: Short-term creep is tested on bars measuring 20 mm or more.
3.5 Testing of mechanical properties and short-term creep of rods is carried out on a reforged or rerolled blank with a diameter or square side from 70 to 90 mm inclusive.
It is permitted to conduct tests on finished grades with a diameter (square side) of up to 100 mm inclusive.
C.5
TU 14-1-1589-2015
Control samples are cut out:
- for rod sizes over 32 mm - along the grain from the middle of the radius;
- for sizes 32 mm and less - from the center of the rods.
3.6 Heat treatment is carried out on blanks with a diameter and square side from 70 to 90 mm, for sizes greater than 100 mm, or in finished grades - for sizes of 100 mm and less.
3.7 Control of macrostructure - on two samples according to the GOST 10243 method.
Macrostructure control is carried out on hot-rolled rods with a diameter from 20 to 55 mm inclusive.
The macrostructure is checked on two longitudinal sections heat-treated according to the mode of Table 1 according to the scale of technical conditions TU 14-1-402-72. The structure corresponding to photos No. 24, 25, 29-34 is considered unacceptable.
The grain size difference is not checked on forged bars.
3.8 All rods are individually subjected to control of surface condition, dimensions and maximum deviations.
3.9 Ultrasonic testing of internal defects is carried out in accordance with GOST 21120.
3.10 In the event of unsatisfactory results, a repeat test is carried out on twice the number of samples of the type of properties that gave unsatisfactory results.
4 Marking, packaging, documentation, transportation and storage
4.1 Marking, packaging, documentation, transportation and storage in accordance with GOST 7566 with the following additions.
4.1.1 All rods measuring 25 mm or more must be stamped with the manufacturer, alloy grade and melt number.
For bars less than 25 mm in size, the specified marks are applied to labels.
4.1.2 The quality document shall indicate the results of all tests provided for by these technical conditions.
The quality document must be signed by the manufacturer's quality control department.
C.6
TU 14-1-1589-2015
Note - The list of regulatory documents (RD) referenced in the text of the technical specifications is given in Appendix B. Codes for the alloy grade and rods are given in Appendix C.
The examination was carried out by the Central Scientific and Methodological Center FSUE "TsNIIchermet named after I.P. Bardin" «02» 09 2015 Head of the laboratory for standardization of metal products S.A. Gorshkov |
C.7
TU 14-1-1589-2015
Appendix A
(required)
Methodology for conducting short-term creep tests.
(Creep tests with rapid heating of the specimen to the test temperature
and the duration of the test itself from a minute or more)
For short-term creep tests, serial testing units of the MP-3 and MP-4 types with modified grips and a heat shield installed to protect the upper loading mechanism and a support crosspiece for installing the furnace can be used. Short-term creep tests are carried out on round (7 and 10 mm in diameter) and flat (up to 4 mm thick) samples.
After the sample is installed and the furnace is moved to the uppermost position, the maximum possible power is supplied to the heating elements of the two-section furnace. The furnace is heated to a temperature close to the specified test temperature of the sample. When this temperature is reached, the first intermediate mode is set for further heating of the furnace: during this period, the temperature is equalized along the height of the furnace muffle. The heating modes are preliminarily determined empirically for each furnace. After reaching the permissible temperature difference (±2÷4) °C along the furnace height, the furnace with the established specified temperature is quickly lowered onto the sample and the sample is heated using the same electrical mode. When the temperature on the sample is 10°C lower than the specified test temperature, the second furnace operating mode is set. During this period, the temperature in the furnace reaches the specified value and the required load is applied to the sample.
To measure the deformation of the test samples, extensometer systems with threaded (M 16x2) clamp bars and spring indicators with a division value of 0.01 mm and a full working stroke of 10 mm are used.
Temperature is measured using thermocouples, the TEMF of which is recorded on a PP-type potentiometer. Chromel-alumel thermocouples are used for tests up to 950 °C, and platinum-rhodium-platinum thermocouples for tests above 950 °C. Two thermocouples are installed on samples with a design length of up to 50 mm, and three thermocouples are installed on samples with a design length over 50 mm.
The regulation of the electric modes of the furnace is carried out separately for each heater and, in general, the furnace is regulated in the mode of changing the electric power within certain limits (according to the "less-more" principle).
C.8
TU 14-1-1589-2015
The time from the moment the sample begins to heat up until the start of the test is from 15 to 18 minutes.
Temperature conditions when the furnace is supplied with stabilized voltage allow maintaining a set temperature (±0.5) °C in the furnace without additional regulation for a significant period of time.
C.9
TU 14-1-1589-2015
Appendix B
(informative)
List of regulatory documents,
which are referenced in the text of the technical specifications
| Designation ND | The number of the item that contains the link | |
|
3.3 2.1, 2.1.2 3.2 4.1 3.3 3.3 3.7 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 2.8, 3.9 1.2.1, 1.2.2 3.2 3.7 |
P.10
TU 14-1-1589-2015
Appendix B
(required)
Form 3.1A
| Name of the type of product according to ND | Product type code according to OKP(OK 005-93) |
Code for ISS | Group |
| Hot rolled and forged rods made of heat-resistant alloy grade 08ХН35ВТЮ-ВД (ЭИ787-ВД) | 09 6488 | 77.140.60 | At 32 |
| Steel grade (alloy) | Steel grade codes(alloy) | ||
| 08ХН35ВТУ-ВД (ЭИ787-ВД) | 8808 | ||
Ministry of Industry and Trade of the Russian Federation Centralresearch instituteI.P. Bardin Ferrous MetallurgyFederal State Unitary Enterprise (FSUE "TsNIIchermet named after I.P. Bardin") Center for Standardization and certification of metal products 105005, Moscow, st. Radio, 23/9, building 2 Tel/Fax 777-93-91 E-mail: mahnev_zssm@mail.ru
OKP 09 6488 |
To the Technical DirectorJSC Metallurgical Plant"Elektrostal"I.V. KabanovISS 77.140.60 Group B 32 |
PRELIMINARY NOTICE
about the change of TU 14-1-1589-2015
"HOT-ROLLED AND FORGED RODS FROM HEAT-RESISTANT
ALLOY GRADE 08KHN35VTYU-VD (EI787-VD)»
1 Point 2.3. Delete the words: "diameter, square side 25 mm".
Reason: Correction of a typo made during the republication.
Deputy Chairman of TC 375
"Metal products from
ferrous metals and alloys" V.T. Ababkov
Introduced in Amendment No. .
