Sheet, circle, wire N70MFV - EP814A
International Equivalent
| Mark | Analogue | W. Nr. | Aisi Uns | En | Order |
|---|---|---|---|---|---|
| Н70МФВ | EP814A | Delivery from the stock, in stock |
Characteristic
Alloy brand N70MFV-VI on the basis of nickel is smelted in vacuum induction furnaces. It is used in the manufacture of welded chemical equipment (heat exchangers, tanks, reactors) which is operated at an elevated temperature in hydrochloric acid, concentrated solutions of phosphoric, acetic and sulfuric acid in the production of hydrohalic acid, acetic acid, polypropylene, ion exchange resins in processes of organic synthesis as well as in the production of chemical and pharmaceutical products. It withstands pressure of the medium to 5 N / mm² and tº from -70 to 500 ° C. On alloy N70MFV-VI has the following specifications: 14−1-2230−77; 14−3-1227−83; 14−1-2260−77; 14−1-4684−89; GOST 5632−72.
Chemical composition:
| C | Cr | Fe | Mn | Mo | Ni | P | S | Si | Ti | V | W |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ≤0,02 | ≤0,3 | ≤0,5 | ≤0,5 | 25 to 27 | Bas. | ≤0,025 | ≤0,02 | ≤0,1 | ≤0,15 | 1.4 to 1.7 | 0.1 to 0.45 |
Mechanical properties at 20 ° C
| TU | products | Rm N / mm² | σ0,2, N / mm² | δ,% | Hardness HB |
|---|---|---|---|---|---|
| According to TU 14−1-2260−77 | rods | 688 | 294 | 25 | - |
| Hot rolled sheets | 784 | 363 | 40 | 220 | |
| According to TU 14−1-2230−87 | Tapes | 833 | 392 | 40 | - |
| According to TU 14−3-1227−83 | Pipes electric | 780 | 340 | 35 | - |
Mechanical properties of the sheet 10 mm thick, quenching process 1070 ° C in water
| tisp, ° C | ReH N / mm² | Rm N / mm² | δ5,% | ψ,% | KCU, J / cm2 |
|---|---|---|---|---|---|
| 20 | 450−500 | 930−980 | 5−66 | 55−65 | 200−240 |
| 500 | 450−500 | 930−980 | 45−50 | 56−65 | 200−240 |
| 600 | 300−380 | 500−700 | 20−35 | 30−38 | 150−230 |
| 700 | 400−420 | 500−580 | 10−20 | 10−30 | 180−210 |
Mechanical properties of the sheet 10 mm thick, quenching process 1070 ° C in water
| tisp, ° C | σ0,2, N / mm² | Rm N / mm² | δ,% | ψ,% | KCU, J / cm2 |
|---|---|---|---|---|---|
| 800 | 300−350 | 500−520 | 20−28 | 25−35 | 160−180 |
| 900 | 300 | 300−350 | 40−60 | 35−50 | 140−160 |
| 1000 | 150−200 | 200 | 60−90 | 40−60 | 120 |
| 1100 | 80 | 100 | 42 | 55 | 110 |
| 1200 | 50 | 50 | 35 | 65 | 80 |
The mechanical properties depend on the degree of cold deformation (sheet thickness 2 mm, the process of quenching in water prior to cold deformation at t ° 1070 ° C)
| The degree of compression,% | σ0,2, N / mm² | Rm N / mm² | δ,% | KCU, J / cm2 |
|---|---|---|---|---|
| 0 | 500 | 980 | 50 | 230 |
| 10 | 700 | 1050 | 50 | 200 |
| 15 | 1000 | 1150 | thirty | 150 |
| 25 | 1050 | 1100 | 150 | 120 |
physical properties
Density 9.2 g / cm3; shear modulus at a temperature of 20−100 ° C is equal to 23 · 10−4 N / mm2; at a temperature of 20−400 ° C — 22 · 10−4 N / mm2; at t ° 500−700 ° C — 20 · 10−4 N / mm2; thermal conductivity at t ° 20 ° C is 0.113 · 10² W / (m · K); specific heat at 20 ° C = 378 J / (kg · K); and the electrical resistivity of the alloy — 1.55 ohm mm2 / m
The values of the temperature coefficient of linear expansion α
| t ° | α · 106, K-1 |
|---|---|
| From 20 to 100 ° C | 8 |
| From 20 to 200 ° C | 9.5 |
| From 20 to 300 ° C | 9.5 |
| From 20 to 400 ° C | 10 |
| From 20 to 500 ° C | 10.4 |
| From 20 to 600 ° C | 10.2 |
| From 20 to 700 ° C | 10.2 |
| From 20 to 800 ° C | 11.22 |
| From 20 to 900 ° C | 12 |
Corrosion resistance
In accordance with the following specifications: 14−1-2260−77, 14−1-2230−77. 14−3-1227−83, 14−1-4684−89 the alloy must have corrosion resistance to intergranular provoking after tempering at t ° 800 ° C (30 min), and the control tests in boiling 21% hydrochloric acid (200 h). The alloy has high corrosion resistance to aggressive substances as follows:
- in a 10−93% H2SO4 at 95 ° C and boiling solutions of 10−40% H2SO4 corrosion rate no greater than 1 mm for 10 years; in 1−10% H2SO4 at 70 ° C (if the acid has oxidizing properties) Corrosion speed of 2 mm s 10;
- in hydrochloric acid at various concentrations and any tº, in t h at reflux.; in the concentration range 1−37% HCl at 25 — 70 ° C, a boiling solution of hydrochloric acid concentration to 10% the corrosion rate of the alloy, alloyed with 2% Mo, not more than 2 mm for 10 years; the boiling solution of hydrochloric acid concentration of 15−21% — not more than 3−4 mm in 10 years;
- phosphoric acid in any concentrations than 94%, to a temperature of 140 ° C the corrosion rate of the steel is less than 0.2 mm in 10 years. The polyphosphoric acids at 100−200 ° C the corrosion rate of not more than 4 mm beyond 10 years; a halogen (iodine, fluorine and bromine), or a net having the same character of a reducing acid such as hydrofluoric acid (80% concentration at room temperature, to 10% at 70 ° C), hydroiodic, hydrobromic, and chlorosulfonic;
- wet hydrogen chloride;
- organic acids including formic acid (10−90% with HCOOH under reflux, 50−80% HCOOH at 140 ° C under pressure) and acetic (50−80% CH3COOH at reflux, 98% CH3COOH at 165 ° under pressure C).
N70MVF-VI alloy also has 1 point resistance in hydrochloric (5−37% concentration to boiling tº), sulfuric acid (50% concentration in the boil tº to 55% concentration at 120 ° C) and chlorides. Nickel-molybdenum alloys are not resistant to nitric acid chlorides of metals (copper, iron, etc.), As well as in other environments that have oxidizing properties. Even small amounts (10% -4) oxidizers (oxygen, chlorine, ferric ions, and copper m. P.) In solutions of sulfuric and hydrochloric acid dramatically reduce the corrosion resistance of such alloys.
process parameters
This alloy is available to any type of processing: forging, rolling, forging, pressing, drawing. Hot deformation is produced in the thermal range of 1220−950 ° C with continuous pre-heating at tº heating. The alloy is more prone to work hardening, compared with austenitic steels of type 18−10, which is why it requires additional intermediate heating treatment under pressure. After molding products must undergo heat treatment at t ° 1070 + 20 ° C (delay 3−5 min / mm cross-section), as well as cooling water for a shower. Alloy Cutting (drilling, turning, milling) is carried out at low speeds with carbide BK3, VK3M, VK6M and Drilling — alloy VK10 VK10M, VK15, VK15M. The alloy welded by manual argon arc or method. In the latter case, the filler material is wire N70M-VI (EP495) according to TU 14−1-673−82) or N65M-VI (EP982), according to TU 281−81 14−13. When arc welding electrodes are used RLA-23. Welding is necessary to conduct intensive cooling. Welds have high mechanical strength (σ0,2 = 350 N / mm2 Rm 720 N / mm2, A5 = 35%, KCU = 150 J / cm²), resistance to intergranular corrosion, in Vol. H. The blade type.
Supply
All submitted articles N70MVF brand-VI certified. The technical documentation includes data on the chemical composition, limiting the percentage of impurities; mechanical properties of products. We can buy in bulk, any semi-finished products for large-scale productions. We also offer optimal conditions for retail customers. High level of service and efficiency of service are the face of our company.
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