Sheet, circle, wire of CrN40MDB - EP937

International Equivalent

Mark Analogue W. Nr. Aisi Uns En Order
HN40MDB EP937 Delivery from the stock, in stock

Alloy KhN40MDB-VI (EP937-VI)

CrN40MDB-VI nickel-iron steel is melted in induction vacuum furnaces. It is used as a wrought non-magnetic material for welded chemical equipment operating in aggressive oxidizing or reducing atmospheres in the technological synthesis lines of acetic, formic. sulfuric nitric. acid, extractive phosphoric acid and similar acids. Used in sulphuric acid environments hydrometallurgical industries containing chlorine ions and hydrogen sulphide. The following TU are provided for the alloy KhN40MDB-VI: 14-1-2131-77; 14-1-2149-77; 14-1-2121-77.

Chemical composition

Al C Ce Cr Cu Fe Mn Mo N Nb Ni Si Y
≤0,2 ≤0,03 Calculation 0.03 From 20 to 22 From 1.5 to 2.2 1.5 to 2.2 Ost. 0.8 to 1.5 5 to 6.5 ≤0,03 C-15-0,8 From 39 to 42 ≤0,2 ≤0,2

Mechanical properties at 20 °C

TU Products σw, N/mm² σ0,2, N/mm² δ5, %
According to TU 14-1-2131-77 Hot-rolled sheets 490 195 30

Mechanical properties at low as well as elevated temperature (7 mm thick sheets, hardening process with 1060 °C in water)

tisp, °C σ0.2, N/mm² σc, N/mm² δ, % ψ, % KCU (ext), J/cm² KCU (transverse), J/cm²
-196 - - - - 290 267
-100 - - - - 330 300
-60 - - - - 340 -
-40 - - - - 335 300
20 275 635 47 69 320 296
150 245 575 43 61 295 266
350 195 540 47 53 315 290
500 185 525 45 41 335 270
600 175 495 58 38 305 247

Mechanical properties at high temperature (7 mm thick sheet, hardening process with 1060 °C in water)

tisp, °C σ0.2, N/mm² σc, N/mm² δ5, % ψ, % KCU (ext), J/cm² KCU (transverse), J/cm²
700 165 390 47 65 280 220
800 160 255 75 90 240 200
900 125 140 78 90 200 190
1000 65 70 102 90 250 210
1100 35 45 123 90 210 200
1200 20 25 115 90 160 165

Physical properties of CrN40MDB-VI

The alloy has a density of 8.26 g/cm³; tº of melting is 1375-1400°C; and magnetic permeability ≤ 1.007 (μTl - m)/A at 20°C. The values of elastic modulus (E), temperature coefficient of linear expansion (α), thermal conductivity coefficient (λ), and resistivity (ρ).

tisp E - 10-4 N/mm2 λ, W/(m - K) ρ -106, Ohm - m tisp α - 106, К-1
20 °С 21,2 12,1 1,07 From 20 to 100 °С 12,8
100 °С 20.4 10,7 1,09 From 20 to 200 °С 13,8
200 °С 20 - 1,12 From 20 to 300 °С 13,4
300 °С 19,6 12,5 1,15 From 20 to 400 °С 14,3
400 °С 18,8 15,2 1,18 20 to 500 °C 14,6
500 °С 18,5 19,8 1,21 From 20 to 600 °С 14,8
600 °С 17.8 21,5 1,23 From 20 to 700 °C 15,3
700 °С 16,6 23,2 1,24 From 20 to 800 ° C 15,4
800 °С 15,9 25 1,25 20 to 900 °C 16
900 °С - - 1,26 - -
1000 °С - - 1,27 - -

Alloy corrosion resistance

Grade CrN40MDB-VI according to TU 14-1-2131-77 has resistance to intergranular corrosion by the method of VU GOST 6O32-89. Before the test the sample is heated up to 700 °C (20 minutes). When tested by the method AM, AMU (GOST 6032-89) alloy demonstrates resistance to intergranular corrosion after heating to 550-950 ° C 95 hours, as well as the method of VU GOST 6032-89 after heating for two hours at t ° 800 ° C. The alloy is not prone to corrosion cracking in boiling solutions of 42% MgCl or 50% H2 SO4. The alloy is resistant to pitting and pitting in FeCl solution, in extraction H3 PO4, concentrated H2 SO4 production environments, and in hydrometallurgical production environments.

Processing

The alloy is easily machined hot and cold, and is also satisfactorily cut. Hot deformation is performed in the thermal range of 1180-900°C. The alloy is welded by argon-arc method using filler wire KhN40MDB-VI or by manual arc welding with Sv-KhN40MDB-VI rod. CrN40MDB-VI with alloys CrN65MV and 06CrN28MdT (EI943) is subject to composite welding.

Supply

All the presented products of CrN40MDB-VI grade are certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; the 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.

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Evek GmbH has an unlimited assortment of iron-nickel alloys of the highest quality. We offer special alloys at the best price. If you are interested in our offer please contact your nearest office. Qualified specialists will provide all necessary information regarding products, price range, sales conditions. The cost of goods depends on the parameters of products and additional terms of delivery.