07X21G7AN5 - ep222 sheet, circle, wire
International Equivalent
Mark | Analogue | W. Nr. | Aisi Uns | En | Order |
---|---|---|---|---|---|
07X21G7AN5 | EP222 | Delivery from the stock, in stock |
Production and application
Steel grade 07X21G7AN5 (EP222) is a chrome-manganese-nickel alloy of austenitic class. It is melted in electric arc furnaces. Also use ESHP and VDP. Production is regulated by the following GOSTs: 5632-72 and 5949-75, as well as TU 14-1-1141-74; 14-1-952-74; 14-1-2476-78; 14-1-2455-78; 14-1-3041-80. This steel is used for welded, non-welded and brazed constructions that operate at tº from -253 to 400°C (chains, spindles, hangers in oxygen units, flanges, fasteners, thin-walled brazed and welded fragments obtained by hot and cold deformation, threaded joints, increased pigging capacity).
Percent composition
C | Cr | Si | Mn | N | Ni | P | S | Fei |
---|---|---|---|---|---|---|---|---|
≤0,07 | 19,5-21 | ≤0,7. | 6-7,5 | 0,15-0,25 | 5-6 | ≤0,03 | ≤0,02 | Basis |
Mechanical properties (normalized) at 20 ° C
TU | Products | σ in, N/mm² | σ0,2, N/mm² | δ5, % | ψ, % | KCU, J/cm2 |
---|---|---|---|---|---|---|
GOST 5949-75 | Sections | 700 | 370 | 40 | 50 | 130 |
14-1-952-74 (Ш) | Rods | 670 | 340 | 40 | 50 | 130 |
14-1-1141-74 | Rods | 700 | 370 | 40 | 50 | 130 |
14-1-2455-78 | Thick plates | 700 | 400 | 25 | - | - |
14-1-2476-78 (W, VD) | Thin sheets | 750 | 400 | 25 | - | - |
14-1-3041-80 | Calibrated hexagons | 670 | 340 | 40 | 50 | - |
Mechanical properties at cryogenic and high tº (sheet 12 mm thick, quenching process in water at 1050 ° C)
t° | σ0,2 | σB | ψ | δ5 | KCU, |
---|---|---|---|---|---|
degrees °С | N/mm² | N/mm² | % | % | J/cm2 |
-253 | 1240 | 1530 | 10 | 12 | 120 |
-70 | 635 | 880 | 54 | 52 | 150 |
20 | 420 | 760 | 60 | 60 | 300 |
100 | 300 | 700 | 50 | 73 | 330 |
200 | 300 | 680 | 73 | 50 | 330 |
300 | 250 | 650 | 75 | 50 | 330 |
400 | 240 | 600 | 73 | 50 | 330 |
500 | 220 | 530 | 72 | 47 | 300 |
600 | 180 | 450 | 63 | 45 | 300 |
σc - Tensile strength, [MPa]
δ5, - Relative elongation at break, [ % ]
ψ - Relative contraction, [ % ]
Mechanical properties at high tº (sheet 12 mm thick, water quenching process at 1050 °С)
t° | σ0,2 | σB | ψ | δ5 | KCU, |
---|---|---|---|---|---|
degrees °С | N/mm² | N/mm² | % | % | J/cm2 |
800 | 150 | 230 | 60 | 45 | 250 |
900 | 100 | 150 | 73 | 58 | 210 |
1000 | 15 | 50 | 73 | 72 | 180 |
1050 | 15 | 40 | 73 | 74 | 155 |
1100 | - | 30 | 72 | 75 | 150 |
1150 | - | 10 | 70 | 55 | 125 |
1200 | - | 10 | 62 | 50 | 125 |
σc - Ultimate short-term strength, [MPa]
δ5, - Relative elongation at break, [ % ]
ψ - Relative narrowing, [ % ]
Mechanical properties depending on the degree of cold plastic deformation at t=20°C (3mm thick sheet, hardening process in water before deformation from 1050°C)
Degree of compression, % | σ0,2, N/mm² | σc, N/mm² | δ5, % | Degree of compression, % | σ0,2, N/mm² | σ in, N/mm² | δ5, % |
---|---|---|---|---|---|---|---|
0 | 463 | 766 | 59,1 | 40 | 1180 | 1250 | 12,1 |
10 | 675 | 830 | 42,2 | 60 | 1299 | 1365 | 6,9 |
20 | 1109 | 1104 | 19,8 | - | - | - | - |
Mechanical properties in pressed condition (2 mm sheet, 20% degree of compression)
tisp, °C | σ0,2, N/mm² | σc, N/mm² | δ5, % |
---|---|---|---|
20 | 990 | 1050 | 26 |
-196 | 1500 | 1860 | 47 |
-253 | 1760 | 2000 | 9 |
Physical properties at 20°C
Density 7,7 g/cm3; specific resistance 0,71 Ohm - mm2/m; thermal conductivity = 19,4 W/(m - K); specific heat capacity 0,430 - 103, J/(kg - K).Modulus of normal elasticity
tisp, °С | E - 10-4 N/mm2 | tisp, °С | E - 10-4 N/mm2 | thisp, °С | E - 10-4 N/mm2 |
---|---|---|---|---|---|
-253 | 22,3 | 20 | 20,2 | 700 | 15,2 |
-196 | 21,1 | 400 | 17,8 | - | - |
Temperature coefficient of linear expansion
11.5 11.5
t, °C | -253-20 | -196-20 | -50-20 | 20-100 | 20-200 | 20-300 | 20-400 | 20-500 | 20-600 | 20-700 |
---|---|---|---|---|---|---|---|---|---|---|
α - 106, К-1 | 9.3 | 15.2 | 15.7 | 16.0 | 16.8 | 17.3 | 18.0 | 18.4 | 18.5 |
Corrosion resistance
In the quenched state, this steel resists intergranular corrosion according to AM and AMU methods,
Technological parameters
Steel is available for cold and hot forging and forging. Hot deformation is carried out at 1150-900°C. Cold pressure treatment is carried out in several stages. The steel retains its structural stability during cooling from +20°C to -253°C.
Welding
This steel is well welded by argon-arc method (with or without an additive), automatic under flux AN-26, manual electric arc. For additive material suitable wire Sv-10H16N25AM6 and Sv-08H15N23V7G7M2. Especially well welded with such stainless grades as 07X16H6, 12X21H5T, 12X18H10T and heat resistant alloys (XH60VT, XH77T1O). For welding with heat-resistant nickel alloys recommend a welding wire Sv06H15N60M15, and with stainless steels - Sv-04H19N11MZ. In this case the welded joints do not require heat treatment.
Mechanical properties of welded joints (exactly without heat treatment after welding)
Mechanical properties of welded joints (exactly without heat treatment after welding)
Welding, metal thickness | tisp, °C | σw, N/mm² | KCU, J/cm2 | bend angle, deg |
---|---|---|---|---|
Argon arc welding with tungsten electrodes with additive wire Sv-10C16N25AM6 Sheets 5 mm | 300, 20, -196, -253 | 510, 700, 1410, 1510 | 240, 230, 130, 130 | |
Carbon arc welding with tungsten electrodes without additive Sheet 2 mm | 300, 20, -196, -253 | 650, 860, 1530, 1680 | -, 110, 100, 90 | -, 180, 180, 46 |
Note to the table: the steel is technological when soldering. If it is compared with 12X18N10T it has much less tendency to hot cracking in a stressed state when brazing with copper-silver brazing alloys, as well as with tin, copper, zinc based solders.
Supply
We supply certified semi-finished products of 07X21G7AN5 grade. The technical documentation includes data on chemical composition, limiting percent of impurities; mechanical properties of products. From us you can buy in bulk any 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.
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