03H21N21M4GB Alloy (ZI-35)
Mark 03H21N21M4GB refers to complex alloyed steels austenitic. Produced in accordance with the following guests: 5632−72, 7350−77, 25, 054−81, as well as TU: 14−1-1190−75, 14−1-2134−77, 14−3-751−78, 14−3- 696−78, 14−3-694−78, 14−1-3262−81, 14−1- 4319−87. This steel is used in the manufacture of welded chemical equipment for the production of phosphoric acid, vinyl acetate, cellulose acetate, sulfittsellyulozy, complex mineral fertilizers, as well as others. Corrosive environments.
The percentage of
Mechanical properties at t = 20 ° C
|TU||products||σ in N / mm²||σ 0,2, N / mm²||δ 5%|
|14−1-1 190−75||Bars: -goryachekatanye-forged||490||215||thirty|
|14−3-694−78 and 14−3-751−78||— cold-||490||215||thirty|
Mechanical properties at 20 ° C
|Sheet thickness, in mm||σ 0,2, N / mm²||σ in N / mm²||δ 5%|
|4−11||(411) 362 (294)||(744) 666 (607)||(55) 40 (30)|
|10−20||(468) 411 (323)||(674) 647 (598)||(45) 38 (30)|
Note: In parentheses are induced maximum and minimum values.
The mechanical properties at low and high t º (rods, the longitudinal specimens, the process of quenching in water from 1080 ° C)135
|es t, ° C||σ 0,2, N / mm²||σ in N / mm²||δ 5%||ψ,%||KCU, J / cm 2||es t, ° C||σ 0,2, N / mm²||σ in N / mm²||δ 5%||ψ,%||KCU, J / cm 2|
Mechanical properties regardless of the degree of cold plastic deformation (longitudinal samples, quenching in water from process 1080 ° C)
|The degree of compression,%||σ 0,2, N / mm²||σ in N / mm²||δ 5%||The degree of compression,%||σ 0,2, N / mm²||σ in N / mm²||δ 5%|
Physical properties of the alloy
Alloy Density 8.0 g / cm 3; the thermal conductivity of 17.2 W / (m · K); the magnetic permeability of 1.252 (mT · m) / A. modulus of elasticity = 18−10 -4 N / mm 2; at 300 ° C reduced the elastic modulus to 15.9×10 -4 N / mm 2;
Temperature coefficient of linear expansion α
|t, ° C||From 20 to 200||From 20 to 300|
|α · June 10, K -1||15.3||16.75|
This steel resistant to intergranular corrosion after provoking leave (700 ° C for one hour). The tests are the method, VU GOST 6032−89. The steel in the hardened condition, as it welds resistant to general corrosion and pitting and intergranular corrosion. In the production of phosphoric acid: in the pulp (32% P2O5, 2% F, 2% S03, phosphogypsum) to 85 ° C and the evaporated acid (54% P2O5, 0.5% F) to 110 ° C is no intergranular corrosion. The corrosion rate of the steel is not more than 0.1 mm / year among 10−20% H2SO4: 80 ° C; 10% H2SO4 doped with 7−9% SO2 and 30 ° C; in 96% acetic acid at 120 ° C. The corrosion rate in borate pulp containing up to 0,6% H2SO4; B2O3 6.03% and 5,08% MgO at 90 ° C does not exceed 0,001 mm / year. Made from such steel turbine type agitator (height 4.5 m and Ø 0,3 m, with the speed of rotation of 700 rev / min) for mixing sludge, which contains 32% P2O5, 1,8% F (in the form H2SiF6, 2 5% S04 (as H2SO4) and phosphogypsum at 70 ° C; coal slurry (28−36% P2O5), 1,6−1,85% F; 1,6−3% SO2 at t = 70−88 ° C), separators, extractors (up to 5.5 m and 8 m Ø) in the manufacture of phosphoric acid (with the addition of fluoride ions).
Hardening occurs in water at t ° 1060−1120 ° C; the same heat treatment used to remove the work hardening after cold and hot deformation. For hot deformation: forging and rolling required t ° 1200−850 ° C, stamping — 1100−900 ° C. Steel lends itself well to deformation or cold conditions, and satisfactorily processed by cutting. When bending sheet metal (5 mm) in the hot and cold bending minimum radii must be twice the thickness of the sheet.
This steel is welded automatically; manual arc and TIG welding. Sheet thickness up to 10 mm satisfactorily welded by all kinds of manual arc welding. Argon method is recommended for sheets thinner than 6 mm for welding root joints thicker than 10 mm. Large items can be satisfactorily welded two kinds of manual arc welding with reduced content of niobium in the metal weld root passes. For the prevention of hot cracking in the weld joints 10 mm thicker, root weld seams need back-step process using welding materials without niobium. The combined method (TIG and MMA welding) is used for the sheet thickness of 12 mm. In the last turn welded seams, which are addressed to a corrosive environment, the electrodes RLA-17U.
The electrodes RLA-17U, RLA-26A, ANV-17 Saint-01H19N18G10AM4 wire suitable for manual welding of sheet steel up to 10 mm and for filling cutting steel with a thickness greater than 10 mm. Electrodes without niobium coating: RLA-26A with wire 03X21N21M4 (ZI-87) and RLA-17U on wire Sv-03H23N28MZDZT — better than steel thickness of 10 mm for welding root passes. A electrodes EA 395/9 recommended for welding the steel from steel grades 08X18H10T, 10X17H13M2T, 10H17N13MZT, and SV of 20K.
With manual TIG welding consumable electrode sheet steel up to 10 mm, as well as to fill the cuts with a thickness greater than 10 mm steel recommend wire Sv-03H23N28MZDZT or 02H21N21M4GB (ZI69). When welding root passes of the steel with a thickness greater than 10 mm, wire recommend 03H21N21M4 (ZI87); for automatic welding — Saint-01H19N18G10AM4 (EP690) and flux AN-18. The strength of the welds = 90% base metal. Welds all types of welding and resistant to common intergranular corrosion.
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