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03Н18К8М5Т steel (VKS-170; ЭК21)

Steel 35KhSN3M1A (VKS-8) Steel 30Kh2GSN2VM (30Kh2GSN2M1; VL-1) Steel 30Kh2GSNVM (VL-1D) Steel 30Х2Н2СВМФА (VKS-3) Steel 30KhGSN2A (30KhGSNA) Steel 30KhGSN2MA (30KhGSNMA) Steel 30ХН3М1ФА (30ХН3М1Ф) Steel 30ХН3М2ФА (30ХН3М2Ф) Steel 32KhN8M1FK5A (VKS-6) Steel 34KhMA (34KhM) Steel 34KhN3MA (0KhN3M) Steel 35KhMA (35KhMAR) Steel 35KhN1M2FA Steel 35KHN3MFA (35KHN3MFAR) Steel 35ХС2Н3М1ФА (VKS-9) Steel 28ХНН3МФА (28ХН3МФ) Steel 36KHN3MFA (36KHN3MF) Steel 38Kh3SNMVFA (SP38) 38KhMFYUA steel 38KhN3MFA steel (38KhN3MF) 40GMFR steel Steel 40KhN2SVA (EI643) Steel 40KhN2SMA (EI643M) Steel 42Kh2GSNM (VKS-1) 43Kh3SNMVFA steel (SP43) Steel 45Г15Н9Х2ЮФ (EP769) 45Kh3NM2FA steel Steel АЦ28ХГН2АФБ Steel АЦ28ХГН3ФТ B2G steel X11MNAFB steel 20KhGSNM steel Steel 01N17K12M5T (EP845; VKS-240) Steel 02N18K9M5T (EP637A; VKS-210) Steel 03N18K8M5T (VKS-170; EK21) Steel 03N19K6M5TR (EP631) Steel 03Cr14H7V Steel 08Х15Н25Т2МФР (EP674) Steel 09Х16НМ2Д (EP887; VNS28) Steel 120G13 (EI256) 12Kh3GNMFBA steel Steel 15Х16Н3КАМФ2 (VNS-47; EK81) 15Kh2GMF steel 15Kh2NMFA steel Steel 16X16H3MAD (EP811; VSN21) Alloy 20ХГСН2МФА (DI107) Steel 28Kh3SNMVFA (SP28; EP326A) Steel 25Х12Н2В2М2Ф (EP311; VNS-6) Steel 25Х20Н9В2М (EP466) Steel 25Kh2GNTA Steel 25Х2ГНТРА Steel 25Х2Н4МФА Steel 25Kh2NMF (25Kh2NMFA) Steel 25KhGSNMA Steel 25KhN3MFA (25KhN3MFAR) Steel 25ХСНВФА (VP25) Steel 26ХН3М2ФА (26ХН3М2ФАA) Steel 26KhN3MF (26KhN3MFA) Steel 26KhN4MF (26KhN4MFA) Steel 27ХН3М2ФА (27ХН3М2Ф) Steel 27ХН3МФА (27ХН3МФ)

Designation

Name The value
Designation GOST Cyrillic 03Н18К8М5Т
Designation GOST Latin 03H18K8M5T
Transliteration 03N18K8M5T
The chemical elements 03Н18Co8Mo5Ti
Name The value
Designation GOST Cyrillic ВКС-170
Designation GOST Latin BKC-170
Transliteration VKS-170
The chemical elements WCoС-170
Name The value
Designation GOST Cyrillic ЭК21
Designation GOST Latin EK21
Transliteration EhK21
The chemical elements -

Description

03Н18К8М5Т steel is used: for the production of bodies of rocket motors, the shafts of helicopters, welded hulls, engines, pressure vessels of large dimensions, body parts for submarines, submersibles, high-load disc turbines, gears and parts gears, spindles.

Note

Maraging steel with higher structural stability in the temperature range from cryogenic to +450 °C.

Standards

Name Code Standards
Classification, nomenclature and general norms В20 OST 1 90005-91
Sectional and shaped rolling В32 TU 14-1-4479-88, TU 14-1-3404-82, TU 14-1-3140-81

Chemical composition

Standard C S P Mn Cr Si Ni Fe Al Ti Mo Co
TU 14-1-3140-81 ≤0.03 ≤0.01 ≤0.01 ≤0.1 ≤0.3 ≤0.1 17.7-19 The rest ≤0.15 0.2-0.4 4.2-5 7.5-8.5
Fe is the basis.
According to TU 14-1-3404-82, the chemical composition is given for steel grade 03Н18К8М5Т-ВД (ЭК21-ВД, ВКС170ВД). Estimated content of modifiers and deoxidizers: magnesium, cerium, hafnium, germanium and boron is established by the supplier's technological instructions and their residual content in the metal is not determined by chemical analysis. A residual chromium content of up to 0.30% is allowed. In the finished product, deviations in chemical composition are permissible: for silicon and manganese, provided that their sum is not more than 0.20% for sulfur and phosphorus, provided that their sum is not more than 0.020%, for nickel by minus 0.20% .
According to TU 14-1-3140-81, the chemical composition is given for steel grade 03N18K8M5T-VD (EC21-VD, VKS170-VD). Estimated content of modifiers and deoxidizers: magnesium, cerium, hafnium, germanium and boron is established by the supplier's technological instructions and their residual content in the metal is not determined by chemical analysis. In the finished product, deviations in chemical composition are allowed: for silicon and manganese, provided that their sum is not more than 0.20%, sulfur and phosphorus, provided that their sum is not more than 0.020%, in nickel by minus 0.20 %.
According to TU 14-1-4479-88, the chemical composition is given for steel grades 03N18K8M5T-VD (EC21-VD) and 03N18K8M5T-ID (EC21-ID). In the finished product deviations in chemical composition are allowed: for silicon and manganese, provided that their amount will not be more than 0.20%; on sulfur and phosphorus, provided that their sum will not exceed 0.020%; for nickel minus 0.20%. A residual chromium content of up to 0.30% is allowed. The calculated content of modifiers and deoxidizers: magnesium, cerium, boron, etc. is established by the supplier's technological instructions and their residual content in the metal is not determined by chemical analysis.

Mechanical characteristics

Section, mm sT|s0,2, MPa σB, MPa y, % kJ/m2, кДж/м2 HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - 1570-1810 - - 45.5-48.5
Bars hot rolled as supplied on the other 14-1-3404-82 (in the state of delivery indicate the direction of cutting out of samples)
- - ≥1570 ≥35 ≥340 -
- - ≥1570 ≥50 ≥490 -
Bars hot rolled on the other 14-1-3140-81. In the state of delivery indicated in the cutting direction of the samples. Quenching in water from 1150-1200 °C (aging for 1 h) + Quenching in water from 930-950 °C (aging for 1 h) + Quenching in air 780-800 °C (delay of 1-3 h) + Aging at 500-550 °C (exposure for 2-8 hours), air cooling
Образец 15х15 ≥1470 ≥1570 ≥35 ≥340 -
Образец 15х15 ≥1470 ≥1570 ≥50 ≥490 -
Bars and rods, hot rolled, forged and strip forged on the other 14-1-4479-88. In the state of delivery specified steel grade and the cutting direction of the samples. Quenching in water from 1150-1200 °C (aging 1 HR) + Triple quenching quenching in water from 930-950 °C (aging for 1 h) + Quenching in air 780-800 °C (delay of 1-3 h) + Aging at 500-550 °C (exposure for 2-8 hours), air cooling
15 - ≥1570 ≥35 ≥340 -
15 - ≥1570 ≥50 ≥490 -
15 - ≥1570 ≥40 ≥392 -
15 - ≥1570 ≥50 ≥490 -
The rolled bars on the other 14-1-3404-82. The longitudinal samples. Annealing in air 780-800 °C (aging 1 HR) + Aging at 490-510 °C (exposure for 2-8 hours), air cooling
≥1471 ≥1570 ≥50 ≥490 -

Description mechanical marks

Name Description
Section Section
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σB Limit short-term strength
y The relative narrowing
kJ/m2 Toughness
HRC Rockwell hardness (indenter diamond spheroconical)

Physical characteristics

Temperature Е, ГПа r, кг/м3 a, 10-6 1/°С
20 197 8120 80-11

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity

Technological properties

Name The value
Macrostructure and contamination The macrostructure of the steel valley not to have shrinkage in looseness, bubbles, cracks, inclusions, brown, bundles, visible without using the magnifying devices.

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