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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