02Х8Н22С6 - ep794 sheet, circle, wire

International Equivalent

Mark	Analogue	W. Nr.	Aisi Uns	En	Order
02Х8Н22С6	EP794				Delivery from the stock, in stock

Characteristics

Grade 02Х8Н22С6 refers to complex-alloyed austenitic steels. Production is normalized by such TU: 14−1-1024−81; 14−1-3164−81; 14−1-3233−81; 14−1-3660−83; 14−1-3812−84; 14−1-3801−85; 14−1-5076−91. It is melted using plasma-arc, vacuum-arc melting, EAF (electroslag remelting). It serves as a base for welded chemical reactors operating in contact with concentrated 85% nitric acid at t° up to 100 °C.

Percentage composition

C	Cr	Si	Mn	Ni	Р	S	Fe
≤0,02	7,5 -1	5,4 -6,7	≤0,6	21 — 23	≤0,03	≤0,02	Basis

Mechanical properties at 20 °С

Range	TU	σ0_{, 2},	σ _in,	_δ5,	KCU,
Hot-rolled sheet	14−1-3801−85	195	540	40
Cold-rolled sheet	14−1-5076−91	195	540	40
Rods	14−1-3812−84	175	520	45	70
Seamless pipes	14−3-1024−81	195	588	35

Physical properties of rolled products at high tº (grade Ø 15 mm, quenched in water at 1050 °С)

_tsp, °C	σ0_.2, N/mm²	σ _in, N/mm²	δ, %	KCU, ^J/cm2	n, r	_mcr, N — m
700	280	320	77	-	9	-
800	190	200	112	370	17	31
900	80	90	133	350	29	18
1000	30	50	153	260	38	11
1100	17	33	147	220	43	60
1150	15	20	140	120	24	-
1200	10	15	112	30	12	40
1250	-	-	-	30	-	-

Mechanical properties of the alloy at 20 °C depending on the degree of cold deformation

Compression strain, %	σ0_{, 2}, N/mm²	σ _in, N/mm²	δ, %	The degree of compression, %	σ0_{, 2}, N/mm²	σ _in, N/mm²	δ, %
0	300	720	72	70	1230	1340	5
10	600	820	45	80	1340	1390	3
30	940	1030	23	90	1430	1500	2
50	1110	1190	8	-	-	-	-

Physical properties at t=20 °C

The density is 7.7 ^g/cm3; modulus of elasticity = 17.8 — ^{10−4 N/mm2}; thermal conductivity = 0.134 — 10² W/(m — K).

The values of temperature coefficient of linear expansion (α) and modulus of elasticity (E)

_tisp, °С	α -¹⁰⁶, ^К-1	_tisp, °С	E — ^{10−4 N/mm2}
20−100	12,3	100	17
20−200	14,4	200	16,4
20−400	15,7	400	15,2
20−600	16,6	600	14
20−800	17,4	700	13,2
20−900	17,9	800	12,2
20−1000	18	-	-

Corrosion resistance

According to TU 14−1-3801−84 and TU 14−1-5076−91 steel 02Х8Н22С6 is resistant to intergranular corrosion after a 24-hour test in a boiling 72% nitric acid solution. Before the test, the steel is subjected to provoking heating to 600 °C for 20 minutes, followed by cooling in air.

Corrosion rate of steel in nitric acid

_HNO3, %	ν, mm/year, at tº	ν, mm/year, at tº	_HNO3, %	ν, mm/year, at tº	ν, mm/year, at tº
	90 °С	100 °С		90 °С	100 °С
65	0,33	0,71	85	0,11	0,2
75	0,22	0,5	93	0,05	0,14

Note: steel has increased resistance to corrosion cracking in 42% magnesium chloride solution.

Treatment

The temperature range of hot deformation is 1150−850°C. This steel is easily forged in both hot and cold condition. Hardening is done in water at 1050 °C, with a heating time and holding time of 2 minutes per mm of thickness. The same treatment is used for deburring not only after hot plastic deformation, but also after cold deformation.

Welding

Welding is carried out by automatic or manual welding. For RTA use electrodes OZL-24 with 02X17H14C4 wire. For automatic arc or manual arc welding — recommend a wire brand 02X8H22C6. The corrosion rate of such welded joints in 98% HNO3 at 100 °C = 0.22 mm/year. To prevent intergranular corrosion parts after welding should be quenched in water at t ° 1050 °C.

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Evek GmbH sells a wide range of stainless steel products. Our representative offices are located. You can make a purchase without leaving your office, through the Company’s website. The technological configuration of each production stage makes it possible to fulfill individual orders, if you are not satisfied with the basic products. We carry out quality orders of non-standard parameters, the terms of their performance are minimal. We provide discounts for bulk purchases.