12Х18Н9Т -eya1t wire, circle

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
12X18H9T Delivery from the stock, in stock

Production and application

12X18H9T steel is an austenitic class chromium-nickel alloy. It is melted in electric arc furnaces. Production is regulated by the following GOSTs: 18 143-72; 5632-72;18 907-73; 4405-75; 5949-75;5582-75; 7350-77; 4986-79; 25054-81; 9940-81; 9941-81; and also TU 14-1-377-72, 14-1-416-72 and 14-1-565-84. Such steel is used in welded structures (heat exchangers, vessels) operating in dilute solutions of HNO3, medium concentrations of organic acids, organic solvents, under the action of soil and atmospheric moisture, cryogenic temperatures up to -196 ° C. It is used in power engineering industry at temperatures up to +600°C, e.g. for heat-exchange fittings of TVEL with water coolant, turbine blades, compressor and pump parts.

Percentage composition

C Cr Fe Mn Ni P S Si Ti
≤0,12 17-19 Osn. ≤2 8-9,5 ≤0,035 ≤0,02 ≤0,8 5-С-0,8

Mechanical properties of rolled products atto 20o C

Range GOST σB σT δ5 ψ Heat treatment
Bar ≤Ø 60 mm 5949-75 540 196 40 55 Hardening 1020 - 1100o C, air cooling
Forgings 1000 mm 25 054-81 510 196 35-40 40-48 Tempering at 1050 - 1100o C,
Sheet thick, 7350-77 530 215 38 Tempering 1030 - 1080o C, water cooling
Electroplated rod 18 907-73 880-930
Wire 18 143-72 590-880 20-25

σB - short-term strength limit;

σT - yield strength for permanent deformation;

δ5 - relative elongation at break;

ψ - relative narrowing, [ % ].

Mechanical properties as function of temperature (rod Ø18-25 mm, hardened at 1050 °C in water)

σB σ0,2 ψ δ5 KCU,
degrees °С N/mm² N/mm² % % J/cm2
-253 1790 600 - 25 120
-196 1610 460 56 38 200
-70 1130 360 64 40 250
20 620 280 63 41 250
300 460 200 65 31 -
400 450 180 65 31 -
500 450 180 65 29 -
600 400 180 61 25 -
700 280 160 59 26 -
800 180 100 69 35 -

σc - Ultimate short-term strength, [MPa]

δ5, - Relative elongation at break, [ % ]

ψ - Relative narrowing, [ % ]

Mechanical properties of 12Х18Н9Т at high tº

tisp, °C σc, N/mm² δ5, % ψ, % KCU, J/cm2 n, r
900 91/84 36,3/34,8 69,6/61,4 230/240 -
1000 55/44 43/38,3 71,3/68,8 200/230 59/-
1100 38/29 37/57,5 70,6/74 150/190 67/19
1150 29/19 49,6/68 82,4/82,4 140/160 75/21
1200 18/18 76,7/52,6 98/72,4 100/140 61/13
1250 - - - - 58/16

Note to the table: In the numerator the structural content of 6-ferrite after heat treatment
<3%, and in the denominator - 35-40% (process of quenching in water from 1150 °С).

Mechanical properties of 12Cr18Ni10Ti depending on the degree of cold deformation (sheets, initial heat treatment: quenching process with 1050 °C in water)

Degree of compression, % σ0,2, N/mm² σc, N/mm² δ5, % Degree of compression, % σ0,2, N/mm² σ in, N/mm² δ5, %
0 290 660 58 60 1200/1530 1330/1880 10/-
30 900 950 12 70 1150 1250 3

Note: Numerator is test tº 20 °C; denominator is 253 °C.

Physical properties at 20°C

Density 7.9 g/cm³, specific electrical resistance 0.75 Ohm - mm2/m, modulus of elasticity 18 - 10-4, N/mm2.

Properties of steels at low, elevated and high tº

tisp E - 10-4 N/mm2 λ, W/(m - K) ρ -106, Ohm - m c, J/(kg - K)
-253 °С 29 2,1 - -
-183 °С 22,5 9,2 - -
-70 °С 21,2 - - -
100 °С - 16,3 0,8 470
200 °С - 17,6 0,87 495
300 °С 16,2 18,9 0,94 516
400 °С - 20,5 0,99 546
500 °С - 21,8 1,05 571
600 °С 14 23,5 1,09 592
700 °С 12,2 24,7 1,14 613
800 °С 9,1 26,4 - -
900 °С - 28,5 - -

Temperature coefficient of linear expansion

t, °C 0 to 20 From -23 to 20 From -83 to 20 From -103 to 20 From -123 to 20 From -143 to 20 From -163 to 20 From -183 to 20 From -196 to 20 From -223 to 20 From -253 to 20
α - 106, К-1 15,7 15,5 15 14,9 14,7 14,3 13,9 13,4 13 12,2 11,2

Corrosion resistance

According to GOST 7350-77, 18 143-72, 5945-75 this steel is resistant to intergranular corrosion. When tested by the method AM, AMU GOST 6032-89: after an hour of heating to 650 ° C sample is immersed in a control solution for 24 and 8 hours, respectively. Steel is resistant to oxidation in the air and in the combustion atmosphere up to 900 ° C, as well as under heat up to 800 ° C Steel is heat-resistant at t ° 600-800 ° C.

Process parameters

The 8-ferrite content should be taken into account in hot work. Castings with 20% or more 8-ferrite are heated to 1250 °C, those containing 16-19% are heated to 1255 °C; those containing less than 16% are heated to 1270 °C. Generally, the pressure treatment is carried out at 1180-850 °C. Heating and cooling rates are not limited. A high degree of plastic deformation is possible in the cold state. To relieve the stress of welds they are subjected to stabilizing annealing (850-900 ° C).

Welding

When automatic submerged-arc welding or argon-arc welding wire Sv-08Cr19Ni10B, Sv-05Cr20Ni9FBS, Sv-04Cr22Ni10BT andWith manual welding - type EA-1F2 electrodes CL-2B2, GL-2, EA-606/11 with a wire Св-05Х19Н9ФЗС2, Св-05Х19Н9ФЗС2 and Св-08Х19Н9Ф2S2. Wire Sv-08Х20Н9S2BTU in shielding gas is used for manual automatic welding.

Electrodes CL-11 and CL-9 with wire rod Св-07Х19Н10Б and Св-07Х25Н13 respectively are used for manual arc welding. When tested according to AM and AMU GOST 6032-89 without provoking heating, these electrodes give the weld resistance to general as well as intergranular corrosion in 65% HNO3 at 70-80 ° C. Admittedly, the welds may be prone to knife corrosion. The welds obtained with CL-11 and CL-9 electrodes have, respectively: σv=550 and 600 N/mm2; KCU=80 and 70 J/cm2;δ=22 and 2%.

Supply

We supply certified 12Х18Н9Т grade steel. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; mechanical properties of products. From us you can buy in bulk any semi-finished products for large-scale production. We also offer optimum conditions for retail buyers. The high level of service and responsiveness of service is the face of our company.

Buy at the best price

Evek GmbH offers its customers an unlimited choice of stainless steel products of the highest quality at a competitive price. If you have difficulty in making a choice, our experienced managers are always available and ready to provide advice. If you make an order you receive certified products that meet international quality standards in the shortest possible time. If you value your time, contact our nearest office today, or order online.